CN114811623A - Heat storage oxidation device for treating low-concentration volatile organic compound exhaust gas - Google Patents

Abstract

The invention provides a heat storage oxidation device for treating low-concentration volatile organic compound exhaust gas, wherein a furnace wall is connected with a first heat storage chamber and a second heat storage chamber to form a combustion chamber; an auxiliary burner is arranged in the combustion chamber; the other ends of the first heat storage chamber and the second heat storage chamber are respectively connected to the reversing valve through an airflow pipeline; the reversing valve is connected with the VOCs air inlet pipeline and the flue gas discharge pipeline; the smoke discharge pipeline is divided into smoke circulation branches; the flue gas circulation branch is connected to the airflow pipeline through the fan. And by adjusting the steering valve, the flowing direction of gas in the device is changed alternately, so that the heat absorption and the heat release between the two heat storage chambers are alternately carried out. The invention reduces the heat loss brought away by the flue gas to the maximum extent by external flue gas recirculation, so as to maintain the temperature in the combustion chamber above the oxidation temperature level of the VOCs without or with little auxiliary fuel, ensure the high-temperature oxidation of the VOCs and realize the purpose of continuously and stably removing the low-concentration VOCs waste gas.

Description

Heat storage oxidation device for treating low-concentration volatile organic compound exhaust gas

Technical Field

The invention belongs to the technical field of energy environment devices, and particularly relates to a heat storage oxidation device for treating low-concentration volatile organic compound exhaust gas.

Background

Industrial processes often produce large quantities of Volatile Organic Compounds (VOCs) in low concentrations, such as in medicine, petrochemicals, printing, electronics, manufacturing, and the like. VOCs generally have foul smell, destroy the ozone layer, cause haze weather, produce photochemical smog, are very harmful to human health, and are listed as air pollutants needing important prevention and control. The thermal oxidation method, also called combustion method, is used for cracking and thoroughly oxidizing organic matters in the waste gas into substances such as carbon dioxide, water and the like at a temperature higher than the ignition point of the organic matters, and is suitable for the environment harmless treatment of different types of VOCs. The thermal storage oxidation technology achieves the required oxidation temperature through organic waste gas preheated by a thermal storage body. However, when the concentration of VOCs is low, the system is difficult to maintain thermally, and an auxiliary fuel is required to maintain the required reaction temperature level, resulting in increased energy consumption and increased processing cost.

Therefore, the invention provides a regenerative oxidation device for treating volatile organic compound exhaust gas, which aims at the problems. The technology reduces the heat loss brought away by the tail gas by introducing flue gas circulation outside the furnace, and can realize the continuous operation of the low-concentration VOCs treatment device under the condition of using less or no auxiliary fuel. Compared with other technologies, the method expands the range of low concentration of VOCs treated by the thermal storage oxidation device, and has the advantages of reducing system energy consumption and operation cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a thermal storage oxidation device for treating low-concentration volatile organic compound exhaust gas.

In order to achieve the above object, the present invention provides a thermal storage oxidizer for treating a low concentration of voc emission gas,

a heat storage oxidation device for processing low-concentration volatile organic compound exhaust gas comprises an upper layer furnace wall and a lower layer furnace wall which are arranged in parallel, wherein two sides of the furnace wall in the length direction are respectively connected with a first heat storage chamber and a second heat storage chamber to form a combustion chamber; the other end of the first heat storage chamber is connected to the reversing valve through a second air flow pipeline, and the other end of the second heat storage chamber is connected to the reversing valve through a first air flow pipeline; the reversing valve is also respectively connected with a first VOCs waste gas inlet pipeline, a second VOCs waste gas inlet pipeline, a first smoke discharge branch and a second smoke discharge branch; the first smoke discharge branch is connected with a second smoke circulation branch, and the second smoke discharge branch is connected with a first smoke circulation branch; the second flue gas circulation branch is provided with a second circulating fan, and the first flue gas circulation branch is provided with a first circulating fan; the outlet of the second circulating fan is connected with the second airflow pipeline, and the outlet of the first circulating fan is connected with the first airflow pipeline.

Preferably, the auxiliary burner is arranged on the upper furnace wall of the combustion chamber.

Preferably, the waste gas enters the first gas flow pipeline through the steering valve from the first VOCs waste gas inlet pipeline, then enters the second regenerator to absorb heat and raise the temperature to be higher than the oxidation temperature of the VOCs, and is fully oxidized in the combustion chamber, the reacted flue gas flows through the first regenerator, transfers the heat to the regenerator, then enters the second gas flow pipeline, and then enters the first flue gas discharge pipeline through the steering valve; a part of flue gas is discharged to the external environment by first fume emission pipeline, and a part of flue gas gets into first gas circulation branch road, gets into first air current pipeline after first circulating fan pressure boost, mixes with the VOCs waste gas that gets into by first VOCs waste gas inlet line to heat VOCs waste gas.

Preferably, the waste gas enters a second gas flow pipeline through a steering valve from a second VOCs waste gas inlet pipeline, then enters a first heat storage chamber to absorb heat and raise the temperature to be higher than the oxidation temperature of VOCs, and is fully oxidized in a combustion chamber, the reacted flue gas flows through a second heat storage chamber, the heat is transferred to the heat storage chamber, then enters a gas flow pipeline, and then enters a second flue gas discharge branch through a steering valve; and one part of smoke is discharged to the external environment through the second smoke discharge branch, and the other part of smoke enters the second smoke circulation branch, enters the second airflow pipeline after being pressurized by the second circulating fan, is mixed with the VOCs waste gas entering the second airflow pipeline and heats the VOCs waste gas.

Two sides of a combustion chamber are respectively connected with a first regenerative chamber and a second regenerative chamber, and a furnace wall is connected with the first regenerative chamber and the second regenerative chamber to form the combustion chamber; an auxiliary burner is arranged in the combustion chamber; the other ends of the first heat storage chamber and the second heat storage chamber are respectively connected to the reversing valve through an airflow pipeline; the reversing valve is connected with the VOCs air inlet pipeline and the flue gas discharge pipeline; the smoke discharge pipeline is divided into smoke circulation branches; the flue gas circulation branch is connected to the airflow pipeline through the fan. And by adjusting the steering valve, the flowing direction of gas in the device is changed alternately, so that the heat absorption and the heat release between the two heat storage chambers are alternately carried out.

The invention reduces the heat loss brought away by the flue gas to the maximum extent by external flue gas recirculation, so that the temperature in the combustion chamber is maintained above the oxidation temperature level of the VOCs without or with little auxiliary fuel, the high-temperature oxidation of the VOCs is ensured, and the continuous and stable removal of the VOCs in the waste gas is realized.

Drawings

FIG. 1 is a schematic view of the thermal storage oxidizer of the present invention.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Examples

As shown in FIG. 1, the regenerative oxidizer for treating low-concentration VOC exhaust gas of the present invention comprises an upper furnace wall 2 and a lower furnace wall 2 arranged in parallel, wherein both sides of the furnace wall 2 in the length direction are respectively connected with a first regenerative chamber 14 and a second regenerative chamber 4 to form a combustion chamber 3; the other end of the first heat storage chamber 14 is connected to the reversing valve 10 through a second air flow pipeline 13, and the other end of the second heat storage chamber 4 is connected to the reversing valve 10 through a first air flow pipeline 5; the reversing valve 10 is also respectively connected with a first VOCs waste gas inlet pipeline 11, a second VOCs waste gas inlet pipeline 12, a first smoke discharge branch 7 and a second smoke discharge branch 8; the first flue gas emission branch 7 is connected with a second flue gas circulation branch 16, and the second flue gas emission branch 8 is connected with a first flue gas circulation branch 15; the second flue gas circulation branch 16 is provided with a second circulating fan 9, and the first flue gas circulation branch 15 is provided with a first circulating fan 6; the outlet of the second circulating fan 9 is connected with the second airflow pipeline 13, and the outlet of the first circulating fan 6 is connected with the first airflow pipeline 5.

As shown in FIG. 1, the present invention is provided with an auxiliary burner 1 installed on the upper furnace wall of a combustion chamber 3.

As shown in figure 1, the invention realizes the alternation of heat absorption and heat release between two regenerators by adjusting the steering valve 10 and changing the flow direction of gas in the device alternately. The first state is that VOCs waste gas enters a first gas flow pipeline 5 from a first VOCs waste gas inlet pipeline 11 through a steering valve 10, then enters a second regenerator 4 to absorb heat and raise the temperature to be higher than the oxidation temperature of VOCs, and is fully oxidized in a combustion chamber 3, the reacted flue gas flows through a first regenerator 14, the heat is transferred to the regenerator, then enters a second gas flow pipeline 13, and then enters a first flue gas discharge pipeline 7 through a reversing valve 10; a part of flue gas is discharged to the external environment by first fume emission pipeline 7, and a part of flue gas gets into first gas circulation branch 15, gets into first air current pipeline 5 after 6 pressure boost of first circulating fan, mixes with the VOCs waste gas that gets into by first VOCs waste gas inlet line 11 to heat VOCs waste gas. After a period of time, the diverter valve 10 is switched and the system enters the second state.

In the second state, VOCs waste gas enters a second gas flow pipeline 13 from a second VOCs waste gas inlet pipeline 12 through a steering valve 10, then enters a first regenerator 14 to absorb heat and raise the temperature to be higher than the oxidation temperature of VOCs, and is fully oxidized in a combustion chamber 3, the reacted flue gas flows through a second regenerator 4, heat is transferred to the regenerator, then enters a gas flow pipeline 5, and then enters a second flue gas discharge branch pipeline 8 through a reversing valve 10; and a part of flue gas is discharged to the external environment through the second flue gas discharge branch 8, and a part of flue gas enters the second flue gas circulation branch 16, enters the second airflow pipeline 13 after being pressurized by the second circulating fan 9, is mixed with the VOCs waste gas entering through the second airflow pipeline 13, and heats the VOCs waste gas. In the next cycle, the system switches to the first operating state again, and so on.

Claims (4)

1. A thermal storage oxidation device for treating low-concentration volatile organic compound exhaust gas is characterized in that: the heat-accumulating type coal gas combustion furnace comprises an upper layer of furnace wall (2) and a lower layer of furnace wall (2) which are arranged in parallel, wherein two sides of the furnace wall (2) in the length direction are respectively connected with a first heat-accumulating chamber (14) and a second heat-accumulating chamber (4) to form a combustion chamber (3); the other end of the first heat storage chamber (14) is connected to the reversing valve (10) through a second air flow pipeline (13), and the other end of the second heat storage chamber (4) is connected to the reversing valve (10) through a first air flow pipeline (5); the reversing valve (10) is also respectively connected with a first VOCs waste gas inlet pipeline (11), a second VOCs waste gas inlet pipeline (12), a first smoke discharge branch (7) and a second smoke discharge branch (8); the first smoke discharge branch (7) is connected with a second smoke circulation branch (16), and the second smoke discharge branch (8) is connected with a first smoke circulation branch (15); the second flue gas circulation branch (16) is provided with a second circulating fan (9), and the first flue gas circulation branch (15) is provided with a first circulating fan (6); the outlet of the second circulating fan (9) is connected with the second airflow pipeline (13), and the outlet of the first circulating fan (6) is connected with the first airflow pipeline (5).

2. The regenerative thermal oxidizer of claim 1, wherein: an auxiliary burner (1) is arranged on the upper furnace wall of the combustion chamber (3).

3. The regenerative thermal oxidizer of claim 1, wherein: waste gas enters a first gas flow pipeline (5) through a first VOCs waste gas inlet pipeline (11) through a steering valve (10), then enters a second regenerator (4) to absorb heat and raise the temperature to be higher than the oxidation temperature of VOCs, and is fully oxidized in a combustion chamber (3), the reacted smoke gas flows through the first regenerator (14), transfers the heat to the regenerator and then enters a second gas flow pipeline (13), and then enters a first smoke gas discharge pipeline (7) through the steering valve (10); a part of flue gas is discharged to the external environment by first fume emission pipeline (7), and a part of flue gas gets into first gas circulation branch road (15), gets into first air current pipeline (5) after first circulating fan (6) pressure boost, mixes with the VOCs waste gas that gets into by first VOCs waste gas admission line (11) to heat VOCs waste gas.

4. The regenerative thermal oxidizer of claim 1, wherein: waste gas enters a second gas flow pipeline (13) through a steering valve (10) from a second VOCs waste gas inlet pipeline (12), then enters a first regenerator (14) to absorb heat and raise the temperature to be higher than the oxidation temperature of VOCs, and is fully oxidized in a combustion chamber (3), the reacted smoke gas flows through a second regenerator (4), heat is transferred to the regenerator and then enters a gas flow pipeline (5), and then enters a second smoke gas discharge branch pipeline (8) through a reversing valve (10); one part of flue gas is discharged to the external environment by second flue gas discharge branch (8), and one part of flue gas gets into second gas circulation branch (16), gets into second air current pipeline (13) after second circulating fan (9) pressure boost, mixes with the VOCs waste gas that gets into by second air current pipeline (13) to heat VOCs waste gas.

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