Printing exhaust gas purification catalytic combustion device

Printing exhaust gas purification catalytic combustion device

Catalytic combustion equipment is currently used in many printing factories to process the volatilization of organic solvents such as ink, toluene, xylene, gasoline, and alcohol. Especially during the drying process of printed materials, the total content of volatile components emitted by ink accounts for 70% -80%. There are efficient equipment for controlling the emission of organic gases such as ethanol, ethyl acetate, butyl acetate, propyl acetate, toluene, xylene, etc. that meet emission standards. It is also used in many environmental impact assessments.

Catalytic combustion printing exhaust gas treatment process:

Junior high efficiency filter+activated carbon adsorption+hot air desorption+catalytic combustion+fan chimney

Working principle: The organic mixed exhaust gas to be treated is first removed of particulate matter in the exhaust gas through a primary filtration device by an induced draft fan. After pre-treatment, the exhaust gas enters an activated carbon adsorption bed. There are three adsorption beds in a single system, which can be switched by pneumatic valves to allow the gas to enter different adsorption beds. The adsorption beds work alternately. After the gas enters the adsorption bed, the organic matter in the gas is adsorbed by the activated carbon and stops on the surface of the activated carbon, thereby purifying the gas. The purified standard gas is then discharged into the atmosphere through the fan. When the adsorption bed is saturated, the desorption fan can be started to desorb the adsorption bed. The desorbed gas first passes through the heat exchanger in the catalytic bed, and then enters the preheater in the catalytic bed. Under the action of the electric heater, the gas temperature is increased to about 300 ℃. Then, through the catalyst, the organic matter undergoes catalytic combustion under the action of the catalyst. The organic gas is decomposed into CO2 and H2O, while releasing a large amount of heat. The gas temperature further increases, and the high-temperature gas passes through the heat exchanger again to exchange heat with the incoming cold air, recovering a part of the heat. The gas coming out of the heat exchanger is divided into two parts: one part is directly discharged; The other part enters the adsorption bed to desorb activated carbon. When the desorption temperature is too high, the supplementary cooling fan can be started for supplementary cooling to stabilize the desorption gas temperature within a suitable range. If the temperature inside the activated carbon adsorption bed exceeds the alarm value, the fire emergency automatic sprinkler system will be automatically activated.

Introduction to Catalytic Combustion Activated Carbon

Activated carbon is a very excellent adsorbent, which is made by using charcoal, various fruit shells, and high-quality coal as raw materials, and processing and manufacturing them through a series of physical and chemical methods such as crushing, screening, catalyst activation, rinsing, drying, and screening. Activated carbon has dual characteristics of physical adsorption and chemical adsorption, and can selectively adsorb various substances in both gas and liquid phases to achieve purposes such as decolorization, purification, disinfection, deodorization, and decontamination.

Coal based granular activated carbon can be divided into coal based crushed carbon and columnar granular carbon according to different production processes. They have the characteristics of wide application range, strong adsorption performance, and high mechanical strength, and are widely used in various gas-phase recovery and purification, catalyst carrier, solvent recovery, and water purification treatment.

The activated carbon adsorption method uses activated carbon as a physical adsorbent to concentrate the harmful substances produced on the solid surface, thereby purifying and treating the exhaust gas. This adsorption process is a physical process that occurs at the interface between solid and gas phases.

The principle of activated carbon having high adsorption capacity for toxic substances in the air (the microporous area of 1 gram of air purification activated carbon can reach nearly 300-1000 square meters, and the adsorption capacity of activated carbon is 30% of its own weight for chemical organic gases and odors. However, in actual operation, to ensure that organic waste gas meets the emission standards after passing through the activated carbon layer, the adsorption capacity of secondary activated carbon is set at 15%). By forcing indoor waste gas to pass through the activated carbon filter layer inside the purifier, effective adsorption of waste gas and odors is achieved, thus achieving the goal of purifying waste gas.

Our company uses honeycomb shaped activated carbon with large specific surface area and strong adsorption capacity to adsorb organic waste gas into the micropores of activated carbon, thereby purifying the gas. The purified gas is then discharged through a fan to achieve the effect of organic waste gas treatment; When the micropores of activated carbon are saturated with adsorption, it can no longer be adsorbed. At this time, the high-temperature hot air generated by the catalytic bed is used to desorb the activated carbon. The organic matter in the micropores of activated carbon will automatically detach from the activated carbon when exposed to high temperature, thus regenerating the activated carbon. The desorbed organic matter has been concentrated (with a concentration several tens of times higher than before) and sent to the catalytic combustion chamber for catalytic combustion. It is catalytically oxidized on the catalyst at 250-300 ℃ to convert it into harmless CO2 and H2O, which are discharged. When the concentration of organic waste gas reaches 2000ppm or more, the organic waste gas can maintain spontaneous combustion in the catalytic bed without further heating. Part of the exhaust gas after combustion is directly discharged into the atmosphere, and most of the hot air flow is recycled to the adsorption bed for desorption and regeneration of activated carbon. This can not only meet the heat energy requirements for combustion and desorption, but also achieve the goal of energy conservation. The regenerated activated carbon can be used for the next adsorption.

The organic gas adsorption catalytic purification device is a new series of products developed by our company based on years of experience in organic waste gas treatment, which is highly efficient, energy-saving, and free of secondary pollution.

principle

This purification device is designed based on two basic principles: adsorption (high efficiency) and catalytic combustion (energy saving), namely adsorption desorption catalytic combustion method.

The exhaust gas containing organic matter passes through the activated carbon adsorption layer by the action of the fan, and the organic matter is trapped inside by the force of the activated carbon *, and the clean gas is discharged; After a period of time, when the activated carbon reaches saturation, adsorption stops, and the organic matter has been concentrated in the activated carbon.

The catalytic purification device is equipped with a heating chamber and a heat storage chamber. The heating device is started and enters the internal circulation. When the hot gas source reaches the boiling point of organic matter, the organic matter runs out of the activated carbon and enters the catalytic chamber for catalytic decomposition into CO2 and H2O, while releasing energy. When the released energy enters the adsorption bed for desorption, the heating device * stops working, and the organic waste gas maintains spontaneous combustion in the catalytic combustion chamber. The exhaust gas is regenerated and circulated until the organic matter * is separated from the activated carbon and decomposed in the catalytic chamber. The waste heat is recovered through a thermal storage bed, which facilitates the next heating and waste heat recovery. The energy recovery efficiency is high, the energy consumption is low, the activated carbon is regenerated, and the organic matter is catalytically decomposed and treated.

Technical performance and characteristics

1. The device is designed with advanced principles, uses high-quality materials, has stable performance, is easy to operate, safe and reliable, and has no secondary pollution. The equipment has a small footprint and is lightweight. The adsorption bed adopts a drawer type structure, which is easy to load and replace.

2. Adopting a new type of activated carbon adsorbent material - honeycomb activated carbon, which has advantages in thermodynamic properties, low resistance, low consumption, high adsorption rate, etc. compared to granular (rod) form, it is suitable for use under high air volume.

3. The catalytic combustion chamber uses precious metal catalysts with ceramic honeycomb bodies, which have low resistance and can operate normally with a low-pressure fan. It not only consumes less power but also has low noise.

4. The air volume of the catalytic combustion device is one tenth of the exhaust gas source air volume, and the heating power is maintained for about 1 hour, saving energy.

5. The activated carbon bed that adsorbs organic waste gas can use the heat generated by catalytic combustion to desorb and regenerate the waste gas. The desorbed gas is then sent to the catalytic combustion chamber for purification. The purified gas is stored and energy recovered in the heat storage chamber without the need for additional energy, resulting in low operating costs and energy savings.

6. An automatic emergency fire sprinkler system is installed inside the activated carbon adsorption bed to ensure system safety.

7. Thermal insulation is installed inside the catalytic combustion furnace, effectively reducing heat loss.

Catalytic combustion device

Structural principle explanation

Catalytic combustion method: It uses a catalyst as an intermediate to convert organic gases into harmless water and carbon dioxide gases at lower temperatures.

The organic gas source in the drying chamber is sent to the purification device through the induced draft fan. Firstly, it passes through the dust removal flame arrester system, then enters the heat exchanger, and finally enters the heating chamber. Through the heating device, the gas reaches the combustion reaction temperature. Then, through the catalytic bed, the organic gas is decomposed into carbon dioxide and water. Finally, it enters the heat exchanger and exchanges heat with the low-temperature gas, raising the temperature of the incoming gas to the reaction temperature. If the reaction temperature cannot be reached, the heating system can use the automatic control system to compensate for heating and make it burn, saving energy. The effective removal rate of exhaust gas reaches over 97%, which meets the national emission standards.

This device consists of a main unit, a induced draft fan, and an electric control cabinet. The main unit of the purification device consists of a thermal storage ceramic, a catalytic combustion furnace body, an electric heating element, a flame retardant dust collector, and an explosion-proof device. The flame retardant dust collector is located on the intake pipeline, and the explosion-proof device is located at the top of the main unit. The process flow diagram is as follows:

The direct exhaust source should have a direct discharge pipeline, controlled by valves, and if necessary, the exhaust gas should be directly discharged (such as during the maintenance of the purification device).

The flame arrester is composed of specially designed multi-layer metal mesh, which can prevent flames from passing through and filter out larger particles (pollutants) in the gas. It is one of the safety devices of this purification device.

The thermal resistor uses a stainless steel protective tube to measure the intake heating temperature and purification temperature.

The catalytic chamber is composed of multiple layers of honeycomb catalysts and is the core of this device.

The explosion-proof device is a diaphragm pressure relief method. When the equipment operates abnormally, it can be promptly cracked to release pressure and prevent accidents from occurring.

The fan adopts a rear induced draft type to operate the device under negative pressure.

Valve control regulates the flow rate of gas.

Features of the equipment

The characteristics of this purification device are:

1. Using precious metals platinum and palladium plated on honeycomb ceramic carriers as catalysts, the purification efficiency can reach over 97%. The catalyst has a long service life and can be regenerated, with smooth airflow and low resistance.

2. Complete safety facilities: equipped with fire-resistant dust collectors, pressure relief ports, over temperature alarms and other protective facilities.

3. Power consumption: At the beginning of operation, preheat for 15-30 minutes for full power heating. During normal operation, only the fan power is consumed. When the concentration of exhaust gas is low, automatic intermittent compensation heating is used.

4. Easy to operate: When the device is in operation, it can achieve automatic control without the need for dedicated personnel to guard it.

5. Small footprint and long service life.

Printing exhaust gas purification catalytic combustion device

after-sales service

1. Equipment installation and delivery phase:

Provide free training

Cooperate with on-site installation and handling plans, and provide on-site guidance;

Actively cooperate with the on-site construction progress requirements and make all necessary preparations for debugging.

2. Debugging and operation phase;

During the warranty period, technical personnel will come to the site for maintenance and inspection in case of equipment failure, to ensure that the equipment can be used normally as much as possible.

During the inspection process, provide retraining and guidance on debugging and maintenance techniques for operators.

Warranty coverage:

For the equipment provided by the seller in this project, we promise that the warranty period for the entire machine is 1 year, with lifetime service (excluding vulnerable parts).

During the warranty period, if the equipment malfunctions due to non-human factors, the seller is responsible for free repair and replacement of parts until the problem is resolved;

During the warranty period, if there is any malfunction due to improper use or outside the warranty period, free service will be provided, and only the cost of replacing the parts will be charged until the problem is resolved.

Outside the warranty period:

Long term service and lifelong responsibility for maintenance;

Repairs that occur outside the warranty period will not incur service fees, and replacement parts will be provided at the standard factory price.

Service requirement: Upon receiving a call for unit malfunction repair, please arrive at the scene as soon as possible.

Scope of Application

This purification device is mainly used for the purification of harmful exhaust gases emitted or leaked in painting, printing, home appliances, shoemaking, plastics, and various chemical workshops, as well as the elimination of odors. It is suitable for organic exhaust gases with low concentrations (50-500ppm) that are not suitable for direct combustion or catalytic combustion methods and recycling treatment, especially for high air volume treatment scenarios, and can achieve satisfactory economic and social benefits.

Company Introduction

Yaoxian Environment takes "environmental protection and energy conservation" as its responsibility. In response to the country's promotion of ecological civilization construction and acceleration of the development of energy-saving and environmental protection industries, it has developed various new energy-saving and environmental protection equipment. At the same time, the company continues to expand its environmental protection business scope. While manufacturing environmental protection products, it also provides services such as environmental monitoring and project completion environmental acceptance. We provide customers with a full process butler style service for environmental protection projects, including project initiation, completion, acceptance, monitoring, preparation of monitoring reports, submission of acceptance materials, and acceptance filing.