TWM572787U - The VOCs exhaust gas zero discharged environmental protection & energy saving system - Google Patents

Abstract

An organic solvent oven exhaust gas zero-emission environmental protection and energy-saving system includes one or more sets of parallel organic solvent ovens, an exhaust gas burning furnace, two sets of exchangers, a temperature equal tank, a set of parallel online high temperature resistant double filters, a chimney, Chimney exhaust dilution windmills and control valves, waste heat recovery systems, a set of duct systems with control valves and several windmills, and a set of programmable control centers. By using the function of the system, the organic waste gas volatilized by the organic solvent oven can be burned, cracked, purified, filtered and recycled to repeatedly heat the organic solvent oven to achieve an environmentally-friendly and energy-saving system with zero emission of organic waste gas and the most energy saving.

Description

Organic waste gas zero emission environmental protection and energy saving system

The utility model relates to an environmental protection and energy-saving system for zero-emission of an organic solvent oven exhaust gas, which completely recovers the high-temperature exhaust gas after combustion cracking to an organic solvent oven through a system design and a high-temperature resistant filter, and is used as a circulating heat source, with particular emphasis on energy conservation and organic waste gas. Zero emissions, achieving full energy-saving and completely environmentally friendly effects;

It is known that when an organic solvent oven is operated, a heat recovery type exhaust gas combustion furnace (RTO) is generally used for the exhaust gas generated by the VOCs to pyrolyze the exhaust gas and recover the energy to the atmosphere after the exhaust gas meets environmental requirements.

Prior art as illustrated in the second figure

01. One or more sets of parallel organic solvent ovens

02. Exhaust gas burning furnace

03. Heat exchanger

04. Waste heat recovery heat exchanger

05. Exhaust chimney

06. Fresh air intake (usually atmospheric) required for organic solvent oven

07. Residual heat exchanger fresh air intake (usually atmospheric)

08. Waste heat recovery

09. Chimney exhaust

As shown in the second figure, the prior art energy consumption is large: the exhaust gas burner (02) has a high temperature, 800 to 850 °C is required to completely crack the VOCs, and the energy consumption is large; the chimney exhaust volume is large (09) the exhaust gas temperature is high. Another big waste; waste heat recovery (08) has a small temperature difference and low heat recovery value.

As shown in the second figure, the trend of the prior art is becoming more and more strict through environmental protection. As the global environmental protection requirements become more and more strict, the emission limits of various organic solvents and organic compound concentrations (such as toluene, phenolic resin, etc.) have been 40mg/m ^{3 is} reduced to 20mg/m ³ or lower, and the combustion temperature of the exhaust gas burner (02) must be increased again to help the VOCs crack, but the cracking temperature exceeding 850 °C seriously challenges the equipment material and parts high temperature resistance, making the equipment It is expensive and easy to malfunction, and the higher the concentration of nitrogen oxides produced by pyrolysis, the higher the nitrogen oxides are, and the additional processing equipment is required. At tens of thousands of cubic meters per hour, it is increasingly difficult to meet environmental requirements in prior art VOCs emission concentrations and total emissions.

In view of the traditional exhaust gas treatment combination system, the energy consumption is high and it is difficult to pass the stricter environmental protection requirements in the future, it is necessary to develop a new environmental protection and energy-saving system with low equipment installation cost, low operation and operation cost, low energy consumption, high environmental protection and zero emission of organic waste gas.

The utility model provides an organic waste gas zero-emission environmental protection and energy-saving system, which comprises one or more sets of parallel organic solvent ovens, an exhaust gas burning furnace, two sets of exchangers, a temperature equalizing box, a group of parallel online high temperature resistant double filters, chimneys, Chimney exhaust dilution windmills and control valves, a set of duct systems with control valves and several windmills, and a set of programmable control centers.

Using this new creation, the combustion cracked high temperature gas is filtered through the high temperature resistant double filter and returned to the organic solvent oven as a circulating heat source, and the energy is optimally utilized and the organic waste gas is discharged.

Using this new type of organic waste gas to generate zero emissions, and the cracking temperature of organic polymers or organic solvents commonly used in most industries is less than 600 ° C, so the furnace temperature can only be controlled at 600 ° C, which can save more than 200 ° C. Energy demand can reduce energy consumption costs.

The use of this new type of combustion furnace temperature requires only 600 ° C, the concentration of nitrogen oxides produced at this temperature is lower and more environmentally friendly.

Using this new type of organic waste gas to generate zero emissions, but based on the operating environment air quality requirements or the protection of the operating staff, some factories have local exhaust design for the organic solvent oven operating area, the local exhaust flow rate is usually 1~2 per hour. Thousands of cubic meters, at this time, local exhaust gas can be incorporated into the main exhaust pipe of the oven and then enter the combustion furnace for cracking. These increased exhaust gas flow must be discharged through the chimney to maintain the system wind pressure balance. It is very small, so even if it is faced with increasingly strict environmental protection requirements, if necessary, it can be started by dilute the windmill, and the appropriate fresh air is added for dilution and then discharged. Therefore, the concentration and total amount of VOCs discharged can be completely passed through stricter environmental protection. Claim.

With this new creation, the waste heat recovery has a high recovery value because of the large temperature difference, and the cold fluid for recovering the heat source can be heat medium oil or air, and can be used for various purposes.

First picture

110‧‧‧Exhaust gas burner

112‧‧‧Preheating heat exchanger

114‧‧‧ Waste heat recovery heat exchanger

122‧‧‧High temperature resistant double filter I

124‧‧‧High temperature resistant double filter II

130‧‧‧Safety control valve for preventing exhaust gas from high temperature out of control and inhaling air to reduce furnace temperature

131‧‧‧Air inlet control valve required for burner

132‧‧‧Exhaust gas to the main cycle explosion-proof variable frequency windmill II suction control valve

134‧‧‧To the chimney exhaust control valve

136‧‧‧Fresh air intake control valve

138‧‧‧Exhaust dilution windmill control valve

140‧‧‧Organic solvent oven personnel operating environment space intake windmill

142‧‧‧Main cycle explosion-proof variable frequency windmill I

144‧‧‧ Waste heat recovery heat exchanger cold fluid loading windmill or pump

146‧‧‧Main cycle explosion-proof variable frequency windmill II

148‧‧‧Exhaust dilution windmill

150‧‧‧One or more sets of parallel organic solvent ovens

151‧‧‧burner

152‧‧‧Organic solvent oven personnel operating environment space

154‧‧‧Evening box

158‧‧‧Exhaust chimney

164‧‧‧Mechanical safety explosion-proof valve

174‧‧‧ Waste heat recovery fluid

Second picture

01‧‧‧One or more sets of parallel organic solvent ovens

02‧‧‧Exhaust gas burner

03‧‧‧ heat exchanger

04‧‧‧ Waste heat recovery heat exchanger

05‧‧‧Exhaust chimney

06‧‧‧ Fresh air intake (usually atmospheric) required for organic solvent ovens

07‧‧‧Excess heat exchanger fresh air intake (usually atmospheric)

08‧‧‧ Waste heat recovery

09‧‧‧ Chimney exhaust

The first picture is the system flow design diagram of this creation.

The second picture is the prior art flow chart

The novel creation embodiment describes that the organic solvent oven (150) generates exhaust gas containing VOCs, which is passed through a temperature equalizing tank (154) and then preheated by a preheating heat exchanger (112), and then enters the exhaust gas burning furnace ( The cracking is carried out in 110), the pyrolyzed high temperature gas enters the waste heat recovery heat exchanger (114) and the incoming heat medium oil or air cold fluid is subjected to waste heat recovery (174), and then enters the preheating heat exchanger (112) as the heat source pair The exhaust gas discharged from the organic solvent oven (150) is itself heat exchanged, and then passes through the high temperature resistant double filter (122), (124) filtered and then enters the organic solvent oven (150) as a circulating heat source, wherein the main cycle frequency conversion explosion-proof windmill I (142), main cycle frequency conversion explosion-proof windmill II (146), exhaust dilution windmill (148) and related control valves (130), (131), (132), (134), (136), (138) are Controlled by a programmable control center; when the initial heating of the organic solvent oven (150) has not produced exhaust gas containing VOCs, the exhaust gas combustion furnace (110) needs to start the combustion machine (151) to be heated by natural gas combustion. The burner (151) requires air (131) to assist combustion, which additionally enters the system. (158) after the gas flow, as can suitably contain VOCs leading to the chimney opening control of the exhaust control valve control center (134) via the programmable directly discharged from the exhaust stack; With the novel, when the organic solvent oven (150) starts to feed the exhaust gas containing VOCs, the heat released by the VOCs is sufficient to maintain the operating temperature of the exhaust gas burner (110), and the burner (151) stops working. Additional air is introduced into the system, the programmable control center controls the chimney exhaust control valve (134) to shut down, and the chimney (158) stops discharging; based on the operating environment air quality requirements or the protection of the operating staff, some plants There will be a partial exhaust (140) design for the organic solvent oven operating zone (152). The local exhaust flow rate is typically 1 to 2 thousand cubic meters per hour. In this case, the local exhaust (140) can be incorporated into the main row of the oven. The trachea is re-entered into the exhaust gas combustion furnace (110) and then vented to the chimney exhaust control valve (134) controlled by the programmable control center, and then exhausted by the exhaust chimney (158), because the discharge amount is small, so even the surface For increasingly stringent environmental requirements, if necessary, the exhaust dilution windmill (148) and the exhaust dilution windmill control valve (138) can be used to replenish the appropriate flow of fresh air into the chimney (158), which will discharge the VOCs. Moderate After dilution, it can pass the stricter environmental emission concentration and total requirements.

The waste heat recovery heat exchanger (114) in the novel type, because the heat source fluid is a high temperature gas of 600 ° C, the heat exchange efficiency is high, and the heated cold fluid (174) can be heat medium oil or air, which can be quite The use of waste heat of value.

When the new system of this creation is just started, the fresh air intake control valve (136) is commanded by the programmable control center to be properly opened. The main cycle explosion-proof variable frequency windmill II (146) draws in fresh air to operate the system when it reaches the organic solvent oven (150). When the required air volume is required, the programmable control center closes the fresh air intake control valve (136) to bring the system into a closed loop state.

The novel system is controlled by a programmable control center to waste to the main cycle explosion-proof variable frequency windmill II suction control valve (132), to the chimney exhaust control valve (134), fresh air intake control valve (136), exhaust Dilution windmill control valve (138), main cycle explosion-proof variable frequency windmill I (142), main circulation Ring explosion-proof variable frequency windmill II (146), exhaust dilution windmill (148) to maintain system wind pressure balance, while controlling waste heat recovery heat exchanger cold fluid loading windmill or pump (144) to control organic solvent oven (150) The required hot air temperature and air volume.

The use of this creation can result in lower equipment installation costs, lower operating costs, lower energy costs, and stricter environmental requirements.

The above-mentioned examples are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. The equivalent changes of the shapes, structures and principles of the present invention should be covered by the protection of the present invention. Within the scope.

In summary, the design of this creation is economical, energy-saving, and environmentally friendly. It is a practical design. It is a novel creation. It is a patent application, and the Bureau of Pray will review it and grant patents as soon as possible. Feeling the virtues.

Claims (6)

An organic waste gas zero-emission environmental protection and energy-saving system includes one or more sets of parallel organic solvent ovens, exhaust gas combustion furnaces, two sets of heat exchangers, a temperature equalization box, a set of parallel online high temperature resistant double filters, chimneys, chimney rows Gas dilution windmill and control valve, waste heat recovery system, a set of air duct system including control valve and several windmills, the function of this system can burn, crack, purify, filter and recover organic waste gas volatilized from organic solvent oven Repeatedly heating the organic solvent oven to achieve zero-emission and the most energy-saving environmentally-friendly and energy-saving system; characterized in that the parallel organic solvent oven is provided with recycling of organic waste gas generated by each printing machine and each coating machine a recycling branch; the parallel organic solvent oven is provided with a temperature equalizing box for heating the organic exhaust gas generated by each printing machine and each coating machine; the parallel organic solvent oven is provided with a return The organic waste gas collected by the revenue and expenditure road is blown into the exhaust gas fan of the combustion chamber in the exhaust gas combustion furnace through the exhaust gas pipeline; the air inlet of the combustion chamber in the exhaust gas combustion furnace is not yet a heat exchange tube for preventing the combustion of the combustion chamber by decelerating and preliminary preheating and heating, and the combustion chamber of the exhaust gas combustion furnace is also connected with a natural gas nozzle that is incombustible when the concentration of the organic exhaust gas is insufficient to be combusted with natural gas; The high temperature gas in the combustion chamber of the exhaust gas combustion furnace is connected with a waste heat recovery system, a parallel online high temperature resistant double filter, a set of air duct system including a control valve and several windmills, a chimney, a chimney exhaust dilution windmill control valve, and the outside world. Filtered fresh cold air connected pipes, high temperature gas generated after combustion of the combustion chamber is input into fresh cold air through the heat exchanger built-in pipe Indirect exchange cools to form high temperature hot air. According to the organic waste gas zero-emission environmental protection and energy-saving system described in claim 1, the high-temperature exhaust gas after combustion or cracking is filtered by the high-temperature double-filter, and then returned to the oven heat source for recycling, thereby reducing the huge heat energy loss caused by the chimney exhaust. The organic waste gas zero-emission environmental protection and energy-saving system according to claim 1, wherein the low-temperature exhaust gas discharged from the organic solvent oven is self-heated by the high-temperature exhaust gas after combustion or cracking of the exhaust gas itself, thereby reducing the heating amount required for the exhaust gas combustion furnace. If the organic waste gas zero-emission environmental protection and energy-saving system described in claim 1 is exhausted without VOCs, or because of the small-flow VOCs emission considering the operating environment space exhaust, the operating temperature of the novel system exhaust gas combustion furnace may be At 600 ° C, it is 200 degrees lower than the temperature of the prior art exhaust gas burner. As claimed in claim 1, the organic waste gas zero-emission environmental protection and energy-saving system, the waste heat recovery system is a high-temperature heat source for recovering 600 ° C, and the heat recovery value is high. According to the organic waste gas zero-emission environmental protection and energy-saving system described in claim 1, the high-temperature exhaust gas after combustion or cracking is filtered by the high-temperature double filter, and then returned to the oven heat source for recycling, so the system has no exhaust gas containing VOCs, or is considered Partially small exhaust in an organic solvent oven operating environment Diluted or not required to be diluted after combustion cracking can fully meet the increasingly stringent environmental requirements.