CN112774423A

CN112774423A - Purification treatment process for flue gas generated after organic waste gas incineration

Info

Publication number: CN112774423A
Application number: CN202110197528.2A
Authority: CN
Inventors: 宋小良; 苏文国
Original assignee: Shuangdun Environment Technology Co ltd
Current assignee: Shuangdun Environment Technology Co ltd
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-05-11

Abstract

The invention discloses a process for purifying flue gas after incineration of organic waste gas. The steps of the process are as follows: A. The flue gas from the front end is not lower than 200°C and is sent to a reverse spray foam quenching tower (1) to be passed through an alkaline circulating liquid Absorb and cool down to below 100°C; B. The flue gas after being absorbed and cooled by the reverse spray foam quenching tower (1) is sent to the cooling absorption tower (2) The alkaline circulating liquid is absorbed and cooled to below 50°C; C. After the cooling absorption tower (2) The flue gas after absorption and cooling is sent to the electrostatic demister (11) for electrostatic adsorption, and the dust content in the discharged flue gas is less than 5mg/Nm ³ and the acid mist content is less than 5mg/Nm ³ . The technical combination of reverse spray foam quenching + cooling absorption + electrostatic defogging of the present invention not only simplifies the process, but also the entire process system is not easy to block, has high absorption efficiency and low system resistance, and can effectively solve agrochemical problems at low operating costs. Organic waste gas pollution in coking and other industries.

Description

Purification treatment process for flue gas generated after organic waste gas incineration

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a purification treatment technology for organic gas burned flue gas in chemical and other industries, in particular to a purification treatment technology for organic waste gas burned flue gas, which has the advantages of optimized flow, simple process operation control and low engineering construction investment.

Background

The national environmental protection requirement is becoming stricter, industries such as agriculture and coking can generate a large amount of flue gas containing organic waste gas in actual production, most of the flue gas treatment process adopts a heat storage incineration process, namely an RTO furnace is used for incineration, indexes of the organic waste gas in the incinerated flue gas can basically reach the standard, but new pollutants such as sulfur dioxide, hydrogen chloride, hydrogen fluoride, dust and the like can be generated in the incinerated flue gas, the current general process for removing the pollutants in the industry is multi-stage water washing or multi-stage alkali washing, finally the standard emission of the sulfur dioxide, the hydrogen chloride, the hydrogen fluoride and the like can be realized, most of the pollutants can not solve the standard emission of the dust and acid mist, and the tail gas has serious white tail plume. The multistage water washing and alkali washing process has the problems of long flow, large system resistance, high investment, easy damage of the first-stage washing tower due to contact with high-temperature flue gas and the like, part of devices are frequently replaced by the vulnerable first-stage washing tower, part of devices are repeatedly transformed, and finally discharged dust and acid mist of part of devices do not reach the standard. A more optimized treatment process is urgently needed to solve the existing problems.

Disclosure of Invention

The invention aims to provide a purification treatment process for flue gas generated after burning organic waste gas, which has the advantages of optimized flow, simple process operation control and low engineering construction investment, and aims to solve the problems in the prior art; the process utilizes the technical combination of reverse-spraying foam quenching, cooling absorption and electrostatic demisting, can effectively recover sulfur resources, utilizes the existing products of factories as a desulfurizing agent, and recovers the desulfurization products as final products, thereby creating value.

The invention aims to solve the problems by the following technical scheme:

a purification treatment process of flue gas generated after burning organic waste gas is characterized in that: the process comprises the following steps:

A. the smoke with the temperature not lower than 200 ℃ from the front end is sent into a reverse-spraying foam quenching tower and absorbed by alkaline circulating liquid to be cooled to below 100 ℃;

B. the flue gas absorbed and cooled by the reverse-spraying foam quenching tower is sent into a cooling absorption tower and is absorbed and cooled to below 50 ℃ by alkaline circulating liquid;

C. the flue gas after being absorbed and cooled by the cooling absorption tower is sent to an electrostatic demister for electrostatic adsorption to remove fine dust, aerosol, acid mist, fine fog drops and other chargeable pollutants carried by the flue gas, and the dust content in the discharged flue gas is less than 5mg/Nm³The content of acid mist is less than 5mg/Nm³。

The reverse spray foam quenching tower in the step A is of a hollow cylindrical structure made of a glass fiber reinforced plastic lining graphite material, alkaline circulating liquid drops with the upward spraying speed of 5-8m/s and the diameter of 20-150 mu m are sprayed out of a large-opening water flow cutting nozzle at the lower part of the reverse spray foam quenching tower after being cut, and flue gas with the downward input speed of not less than 20m/s from the top of the reverse spray foam quenching tower is in full contact with the inside of the cavity of the reverse spray foam quenching tower, so that a foam columnar contact area with the quickly updated surface and the enlarged contact area is formed, and instant cooling and dust removal are completed in the foam columnar contact area.

And the bottom of the back spray foam quenching tower in the step A is communicated with a circulating tower kettle of the cooling absorption tower, and the circulating tower kettle is connected with a large-opening water flow cutting nozzle arranged at the lower part of the back spray foam quenching tower through a circulating liquid pipeline with a quenching circulating pump so as to supply alkaline circulating liquid drops.

And B, arranging a cooling water curtain generator at the top of the inner cavity of the reverse spraying foam quenching tower in the step A, wherein liquid sprayed by the cooling water curtain generator can form an even protective cooling water curtain on the inner wall of the reverse spraying foam quenching tower, and the effect of preventing high-temperature smoke from damaging equipment is achieved.

The cooling water curtain generator is connected with a high-level groove at a high position through a pipeline, the high-level groove is connected with a process water supply pipeline and/or a branch of a circulating liquid pipeline with a quenching circulating pump through a pipeline, and liquid flowing down from the high-level groove enters in the cooling water curtain generator in an annular mode in a tangent mode.

And an overflow pipe is arranged on the elevated tank and is connected with a communication pipeline between the cooling water curtain generator and the elevated tank so as to prevent the elevated tank from overflowing due to the excessive supply of process water.

A circulation tower kettle is arranged at the bottom of the cooling absorption tower in the step B, a packing layer, a liquid spraying mechanism and a baffle plate type mechanical demister are sequentially arranged in an inner cavity of the cooling absorption tower above the circulation tower kettle, and the circulation tower kettle is connected with the liquid spraying mechanism through an alkaline circulation liquid pipeline with a cooling circulation pump; the flue gas after being absorbed and cooled by the reverse-spraying foam quenching tower enters a cooling absorption tower, then ascends to enter a packing layer, fully contacts alkaline circulating liquid with the flue gas in the packing layer, and simultaneously completes absorption of the flue gas and heat transfer for cooling, sulfur dioxide, hydrogen chloride and hydrogen fluoride in the flue gas are removed by utilizing the alkaline circulating liquid, and the flue gas which ascends to pass through the packing layer enters a baffle plate type mechanical demister to preliminarily remove large-particle fog drops in the flue gas and then enters a subsequent electrostatic demister.

The circulation tower kettle is connected with a circulation liquid inlet of a circulation liquid cooler through an alkaline circulation liquid pipeline with a cooling circulation pump, a circulation liquid outlet of the circulation liquid cooler is connected with a liquid spraying mechanism through a circulation liquid cooling pipeline, and a water feeding port and a water return port of the circulation liquid cooler are respectively connected with a circulation water feeding pipe and a circulation water return pipe.

The circulating liquid cooler can reduce the temperature of the alkaline circulating liquid output from the circulating tower kettle from 60-80 ℃ to 40-50 ℃.

And an outer discharge branch pipe with an automatic outer discharge valve is arranged on an alkaline circulating liquid pipeline between the cooling circulating pump and the circulating liquid cooler, the automatic outer discharge valve is interlocked with a liquid level meter arranged on the circulating tower kettle, the automatic outer discharge valve is opened when the liquid level of the circulating tower kettle is higher than the high level through setting the low level and the high level of the liquid level value of the liquid level meter, and the automatic outer discharge valve is closed when the liquid level of the circulating tower kettle is lower than the low level.

And a pH meter is arranged on a circulating liquid cooling pipeline between the circulating liquid cooler and the liquid spraying mechanism and is interlocked with an automatic alkali adding valve arranged on the alkali liquid adding pipeline, when the pH value of the alkaline circulating liquid measured by the pH meter is below 7, the automatic alkali adding valve is opened, and when the pH value of the alkaline circulating liquid measured by the pH meter is above 9, the automatic alkali adding valve is closed.

Specifically, the circulating liquid cooling pipeline leads a branch to be communicated with the pH meter and leads a branch to be communicated with the cooling absorption tower, so that the cooled alkaline circulating liquid led in by the pH meter in real time returns to the tower body, and the value detected by the pH meter is the real-time value of operation.

Compared with the prior art, the invention has the following advantages:

the method comprises the steps of feeding flue gas from an organic gas regenerative thermal oxidizer (RTO furnace) into a reverse-spraying foam quenching tower, cooling, then feeding the flue gas into a cooling absorption tower which is combined with the reverse-spraying foam quenching tower into a whole, further cooling and transferring heat to the flue gas, and then feeding the flue gas into an electrostatic demister arranged at the top of the cooling absorption tower to remove pollutants such as acid mist, fog drops, dust and the like in the flue gas; adding external alkali liquor into the cooling absorption tower, and controlling the pH value of the alkaline circulating liquid to ensure that acidic pollutants such as hydrogen chloride, sulfur dioxide and the like in the finally discharged flue gas reach the standard and are discharged; conveying the absorption liquid generated by absorption to the next production flow; the process is simplified, the whole process system is not easy to block, the absorption efficiency is high, the system resistance is small, and the organic waste gas pollution problem in the industries of agriculture, coking and the like can be effectively solved at lower operation cost.

The process of the invention adopts the protective measure with the cooling water curtain, and the protective measure is also suitable for other high-temperature flue gas treatment devices; the cooling absorption tower can improve the absorption efficiency of the flue gas on acidic pollutants, and meanwhile, the circulating liquid cooling device is arranged to reduce the temperature of the flue gas, reduce the water content of the flue gas and effectively control white tail feathers of the discharged tail gas; meanwhile, the technology of reverse-spraying foam quenching, cooling absorption and electrostatic demisting is combined with several functions of quenching, cooling absorption, white tail feather elimination and electrostatic demisting to form one device, so that the occupied area can be reduced, and the system resistance is reduced; and the sulfur resource can be effectively recovered, the existing products in a factory are used as a desulfurizing agent, and the desulfurization product is used as a final product to be recovered, so that the value is created.

Drawings

FIG. 1 is a flow chart of the purification treatment process of the flue gas after the incineration of organic waste gas.

Wherein: 1-a reverse spray foam quenching tower; 101-cooling water curtain generator; 102-large opening water flow cutting nozzle; 2-cooling absorption tower; 201-baffle type mechanical demister; 202-liquid spray mechanism; 203-a packing layer; 204-circulation tower kettle; 3-elevated tank; 31-overflow line; 4-cooling circulation pump; 5-a circulating liquid cooler; 6-pH meter; 7-a liquid level meter; 8-quenching circulating pump; 9-automatic alkali adding valve; 10-automatic discharge valve; 11-electrostatic mist eliminator.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1: a purification treatment process for flue gas generated after burning organic waste gas comprises the following steps:

A. the temperature in the flue gas from the front-end organic gas heat accumulation incinerator in the back-spraying foam quenching tower 1 is above 200 ℃, the temperature is high, when the back-spraying foam quenching tower contacts with washing equipment, if the washing equipment is made of non-metal materials, high-temperature damage can easily occur, and if the washing equipment is made of metal materials, damage to equipment such as acid media, fluorine and chlorine in the flue gas can easily occur. In order to solve the problem at the same time, the reverse spray foam quenching tower 1 with a hollow cylindrical structure adopts a graphite material lined with glass fiber reinforced plastics, high-temperature flue gas enters from the top of the reverse spray foam quenching tower 1, the upper part of the reverse spray foam quenching tower is provided with a cooling water curtain generator 101, and a layer of uniform protective cooling water curtain is formed on the inner wall of the reverse spray foam quenching tower 1 by utilizing continuous and uninterrupted process water or alkaline circulating liquid so as to prevent the high-temperature flue gas from damaging equipment; the water of the protective cooling water curtain is from a high-level tank 3 arranged at a high level, and the circulating liquid of the high-level tank 3 is from a process water supply pipeline and/or a branch of a circulating liquid pipeline with a quenching circulating pump 8 is connected; the method comprises the following steps that a large-opening water flow cutting nozzle 102 is arranged at the bottom of a reverse spraying foam quenching tower 1, the large-opening water flow cutting nozzle 102 cuts alkaline circulation liquid from a quenching circulating pump 8 into small water drops with the diameter of 20-150 mu m, the small water drops are sprayed upwards at the speed of 5-8m/s and are in reverse contact with flue gas entering downwards from the top, the flow speed of the flue gas entering the reverse spraying foam quenching tower 1 is generally controlled to be more than 20m/s according to the size of the reverse spraying foam quenching tower 1, the flue gas is in full contact with alkaline circulation liquid drops sprayed by the large-opening water flow cutting nozzle 102 at the middle upper part of an inner cavity of the reverse spraying foam quenching tower 1, a foam columnar contact area with a more rapid surface and a larger contact area is formed, and instantaneous cooling and dust removal work are completed in the foam columnar contact area; after passing through the reverse spray foam quenching tower 1, the flue gas can be rapidly quenched to below 100 ℃, and the water content in the flue gas reaches 100 percent saturation.

B. The flue gas cooled by the reverse spray foam quenching tower 1 enters the cooling absorption tower 2 by utilizing a communicating pipe between the lower part of the reverse spray foam quenching tower 1 and the subsequent cooling absorption tower 2, and the alkaline circulating liquid returns to a circulating tower kettle 204 of the cooling absorption tower 2, namely, the circulating tower kettle 204 of the cooling absorption tower 2 is simultaneously used as a tower kettle of the reverse spray foam quenching tower 1; the cooled flue gas enters a packing layer 203 arranged in a cooling absorption tower bottom 2, the characteristic of large specific surface area of the packing is utilized, the full contact between the alkaline circulating liquid and the flue gas is completed in the packing layer 203, the absorption, cooling and heat transfer of the flue gas are completed simultaneously, the sulfur dioxide, hydrogen chloride and hydrogen fluoride in the flue gas are removed by utilizing the alkaline circulating liquid, and the temperature of the circulating liquid is reduced by utilizing a circulating liquid cooler 5 arranged on an alkaline circulating liquid pipeline, so that the temperature of the flue gas is further reduced, the saturated water content in the flue gas is reduced, and the aim of eliminating the white tail plume of the discharged flue gas is fulfilled; the flue gas after the temperature reduction and absorption enters a baffle plate type mechanical demister 201 arranged at the upper part of the temperature reduction absorption tower 2 to preliminarily remove large-particle fog drops in the flue gas and then enters a subsequent electrostatic demister 11.

C. The flue gas without large particle fog drops enters an electrostatic demister 11 arranged at the top of the cooling absorption tower 2, and the electrostatic adsorption force of the electrostatic demister 11 is utilized to remove fine dust, aerosol, acid mist, fine fog drops and other pollutants capable of being charged carried by the flue gas, so that the aim of deep purification is achieved, and the dust content in the flue gas is less than 5mg/Nm³Acid ofFog content less than 5mg/Nm³The discharged flue gas can reach the standard, and near zero emission can be realized.

On the basis of the above process, in order to realize the automatic control of the addition of the alkali liquor, an automatic alkali adding valve 9 is arranged to be interlocked with a pH meter 6 for measuring the pH value of the alkaline circulating liquid, the pH value of the circulating liquid is set to be between 7 and 9, the automatic alkali adding valve 9 is opened when the pH value of the alkaline circulating liquid is below 7, and the automatic alkali adding valve 9 is closed when the pH value of the circulating liquid is above 9.

In order to realize the automatic control of the external drainage, an external drainage branch pipe with an automatic drainage valve 10 is arranged on an alkaline circulating liquid pipeline between a cooling circulating pump 4 and a circulating liquid cooler 5, the automatic drainage valve 10 is interlocked with a liquid level meter 7 arranged on a circulating tower kettle 204, through setting the low position and the high position of a liquid level value on the liquid level meter 7, when the liquid level of the circulating tower kettle 204 is higher than the high position, the automatic drainage valve 10 is opened, and when the liquid level of the circulating tower kettle 204 is lower than the low position, the automatic drainage valve 10 is closed.

Example one

After organic waste gas generated by the production line of a certain agricultural chemical enterprise in Jiangsu salt city is incinerated by the RTO incinerator, the temperature of the flue gas at the outlet of the incinerator is 250 ℃, and the amount of the flue gas is 51140Nm³The nitrogen content in the flue gas is about 71.1%, the water vapor content is about 8.6%, the oxygen content is about 17.5%, the carbon dioxide content is about 1%, and the dust content in the flue gas is about 100mg/Nm³The sulfur dioxide content is about 400mg/Nm³。

The liquid amount of the alkaline circulation liquid of the cooling water curtain generator 101 in the back spray foam quenching tower 1 is about 25m³H, the liquid from the elevated tank 3 disposed at a high level, the liquid in the elevated tank 3 is branched from the quenching circulation pump 8, and the circulation amount of the quenching circulation pump 8 is 160m³H; circulating liquid flowing down from the elevated tank 3 enters in the cooling water curtain generator 101 in an oriented annular manner, and a layer of uniform protective cooling water curtain is formed on the inner wall of the back spray foam quenching tower 1, so that the effect of preventing high-temperature flue gas from damaging equipment is achieved. The bottom of the reverse-spraying foam quenching tower is provided with a large-opening water flow cutting nozzle 102, and the circulating liquid from the quenching circulating pump 8 is cut into small water drops with the diameter of 20-150 mu m, then the small water drops are sprayed upwards and the small water drops are sprayed downwards from the topThe flue gas entering the reverse spraying foam quenching tower 1 is in reverse contact, the flow speed of the flue gas entering the reverse spraying foam quenching tower 1 is controlled to be about 21m/s, the flue gas is in full contact with alkaline circulating liquid sprayed by a large-opening water flow cutting nozzle 102 at the middle upper part of an inner cavity of the reverse spraying foam quenching tower 1 to form a foam columnar contact area with a quicker surface updating and a larger contact area, instantaneous cooling and dust removal work are completed in the foam columnar contact area, the flue gas can be rapidly quenched to below 62 ℃ after passing through the reverse spraying foam quenching tower 1, and the water content in the flue gas reaches 100% saturation.

The flue gas cooled by the reverse spray foam quenching tower by 1 degree enters the cooling absorption tower 2 by utilizing a communicating pipe between the lower part of the reverse spray foam quenching tower 1 and the subsequent cooling absorption tower 2, the alkaline circulating liquid returns to a circulating tower kettle 204 of the cooling absorption tower 2, and the volume of the tower kettle is 30m³Namely, the circulating tower kettle 204 of the cooling absorption tower 2 is simultaneously used as the tower kettle of the back spray foam quenching tower 1. The cooled flue gas enters a filler layer 203 arranged in the bottom 1 of the cooling absorption tower, the height of the filler is about 3m, a liquid spraying mechanism 202 is arranged on the upper part of the filler, and the circulating amount of the liquid spraying mechanism 202 from a cooling circulating pump 4 is about 300m³The circulation liquid of the/h is uniformly distributed on the surface of the packing layer 203, the characteristic of large specific surface area of the packing is utilized, the full contact between the absorption liquid and the flue gas is completed in the packing layer 203, the absorption, the temperature reduction and the heat transfer of the flue gas are simultaneously completed, the sulfur dioxide, the hydrogen chloride and the hydrogen fluoride in the flue gas are removed by utilizing the alkaline circulation liquid, and the temperature of the alkaline circulation liquid is reduced by utilizing the circulation liquid cooler 5 arranged on an alkaline circulation liquid pipeline, so that the temperature of the flue gas is further reduced, the saturated water content in the flue gas is reduced, and the aim of eliminating the white tail plume of the discharged flue gas is fulfilled. After the temperature is reduced, the temperature of the flue gas can be further reduced from 62 ℃ to 40 ℃, and the content of sulfur dioxide in the flue gas is 400mg/Nm³Down to 20mg/Nm³The dust content is 100mg/Nm³Down to 30mg/Nm³The following; the flue gas which is cooled and absorbed enters a baffle plate type mechanical demister 201 arranged at the top of the cooling absorption tower 2 and enters a subsequent electrostatic demister 11 after large-particle fog drops in the flue gas are preliminarily removed. The circulating water amount required for cooling is about 500m³/h。

The flue gas without large particle fog drops enters an electrostatic demister 11 arranged at the top of the cooling absorption tower 2, and the electrostatic adsorption force of the electrostatic demister 11 is utilized to remove fine dust, aerosol, acid mist, fine fog drops and other pollutants capable of being charged carried by the flue gas, so that the aim of deep purification is achieved, and the dust content in the flue gas can be controlled from 30mg/Nm³Reduced to less than 5mg/Nm³The content of acid mist is less than 5mg/Nm³The discharged flue gas can reach the standard, and near zero emission can be realized.

The automatic alkali adding valve 9 is interlocked with the pH meter 6 of the alkali circulating liquid to realize the automatic control of alkali liquid addition, when the value of the pH meter 6 is below 7, the automatic alkali adding valve 9 is opened, and when the value of the pH meter 6 is above 9, the automatic alkali adding valve 9 is closed; the amount of discharged salt-containing liquid is about 2.5m³H is used as the reference value. The automatic discharge valve 10 is interlocked with the liquid level meter 7 of the circulation tower kettle 204 to realize the automatic control of the discharged liquid, and through setting the low level and the high level of the liquid level value, the automatic discharge valve 10 is opened when the liquid level of the circulation tower kettle 204 is higher than the high level, and the automatic discharge valve 10 is closed when the liquid level of the circulation tower kettle 204 is lower than the low level. The liquid level of the circulating tower kettle 204 of the project is controlled to be 1.5-2.0 meters, and the flue gas can be condensed to produce about 5.8 meters³The water/h, and therefore the liquid level, will rise all the time, and therefore the automatic discharge valve 10 will be opened frequently.

The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.

Claims

1. a purification treatment process of flue gas after the incineration of organic waste gas, is characterized in that: the step of this technology is as follows:

A. The flue gas from the front end not lower than 200℃ is sent to the reverse spray foam quenching tower (1) to be absorbed and cooled to below 100℃ by the alkaline circulating liquid;

B. The flue gas after being absorbed and cooled by the reverse spray foam quenching tower (1) is sent to the cooling absorption tower (2) to be absorbed and cooled to below 50 ℃ by the alkaline circulating liquid;

C. The flue gas after being absorbed and cooled by the cooling absorption tower (2) is sent to the electrostatic demister (11) for electrostatic adsorption to remove the fine dust, aerosol, acid mist, fine mist droplets and other chargeable particles carried by the flue gas. Pollutants, the dust content in the exhaust flue gas is less than 5mg/Nm ³ and the acid mist content is less than 5mg/Nm ³ .

2. The process for purifying flue gas after the incineration of organic waste gas according to claim 1, characterized in that: the reverse spray foam quenching tower (1) in the step A is a hollow cylinder made of glass fiber reinforced plastic lined with graphite material. The large opening water flow cutting nozzle (102) at the lower part of the reverse spray foam quenching tower (1) is cut and sprayed upward with a speed of 5-8m/s and a diameter of 20-150μm. Alkaline circulating droplets and self-reverse spray foam The flue gas with a downward input velocity of not less than 20m/s from the top of the quenching tower (1) is fully contacted in the inner cavity of the reverse spray foam quenching tower (1), forming a foam columnar contact area with rapid surface renewal and enlarged contact area, and Instant cooling and dust removal are accomplished in the foam column contact area.

3. The process for purifying flue gas after the incineration of organic waste gas according to claim 1 or 2, characterized in that: the bottom of the reverse spray foam quenching tower (1) in the step A is communicated with the cooling absorption tower (2). The circulating tower still (204) and the circulating tower still (204) are connected with the large opening water flow cutting nozzle (102) arranged at the lower part of the reverse spray foam quenching tower (1) through a circulating liquid pipeline with a quenching circulating pump (8) to Supply alkaline circulating droplets.

4. The process for purifying flue gas after the incineration of organic waste gas according to claim 1 or 2, characterized in that: the top of the inner cavity of the reverse spray foam quenching tower (1) in the step A is provided with a cooling water curtain to generate The liquid sprayed from the cooling water curtain generator (101) can form a uniform layer of protective cooling water curtain on the inner wall of the reverse spray foam quenching tower (1), which can prevent the high temperature flue gas from damaging the equipment. effect.

5. The process for purifying flue gas after incineration of organic waste gas according to claim 4, characterized in that: the cooling water curtain generator (101) is connected to a high-level tank (3) located at a high position through a pipeline , the high-level tank (3) is connected with the process water supply pipeline and/or the branch circuit of the circulating liquid pipeline with the quenching circulating pump (8) through the pipeline, and the liquid flowing down from the high-level tank (3) is cooling down The water curtain generator (101) enters tangentially and annularly.

6 . The process for purifying flue gas after incineration of organic waste gas according to claim 5 , characterized in that: an overflow pipe ( 31 ) is provided on the elevated tank ( 3 ), and the overflow pipe ( 31 ) and the cooling The communication pipeline between the water curtain generator (101) and the high level tank (3) is connected.

7. The process for purifying flue gas after incineration of organic waste gas according to claim 1, characterized in that: the bottom of the cooling absorption tower (2) in the step B is provided with a circulating tower kettle (204), and the circulating tower is The inner cavity of the cooling absorption tower (2) above the kettle (204) is sequentially provided with a packing layer (203), a liquid spray mechanism (202), a baffle-type mechanical demister (201), and a circulating tower kettle (204) The alkaline circulating liquid pipeline with the cooling circulating pump (4) is connected to the liquid spraying mechanism (202); the flue gas after being absorbed and cooled by the reverse spray foam quenching tower (1) enters the cooling absorption tower (2). , enter the packing layer (203) and complete the full contact between the alkaline circulating liquid and the flue gas in the packing layer (203), and at the same time complete the absorption of the flue gas, reduce the temperature and transfer heat, and use the alkaline circulating liquid to remove the sulfur dioxide in the flue gas. , hydrogen chloride and hydrogen fluoride are removed, and the flue gas passing through the packing layer (203) upwards enters the baffle-type mechanical mist eliminator (201) to initially remove the large particle mist droplets in the flue gas and then enters the subsequent electrostatic mist eliminator (11). .

8 . The process for purifying flue gas after incineration of organic waste gas according to claim 7 , wherein the circulating tower still ( 204 ) is connected to the alkaline circulating liquid pipeline with a cooling circulating pump ( 4 ). 9 . The circulating liquid inlet of the circulating liquid cooler (5) is connected, and the circulating liquid outlet of the circulating liquid cooler (5) is connected with the liquid spraying mechanism (202) through the circulating liquid cooling pipeline. ) of the water supply and return ports are respectively connected with the circulating water supply pipe and the circulating water return pipe.

9. The process for purifying flue gas after incineration of organic waste gas according to claim 8, characterized in that: the alkaline circulating liquid pipeline between the temperature-reducing circulating pump (4) and the circulating liquid cooler (5) is provided with There is an external discharge branch pipe with an automatic external discharge valve (10), the automatic external discharge valve (10) is interlocked with the liquid level gauge (7) set on the circulating tower kettle (204), and by setting the liquid level gauge (7) The low level and high level of the liquid level value, when the liquid level of the circulating tower kettle (204) is higher than the high level, open the automatic discharge valve (10), when the liquid level of the circulating tower kettle (204) is lower than the low level, close the automatic external discharge valve (10). Drain valve (10).

10. The process for purifying flue gas after incineration of organic waste gas according to claim 8, characterized in that: a circulating liquid cooling pipeline between the circulating liquid cooler (5) and the liquid spraying mechanism (202) is provided with There is a pH meter (6), the pH meter (6) is interlocked with the automatic alkali addition valve (9) set on the alkali solution adding pipeline, when the pH value of the alkaline circulating solution measured by the pH meter (6) is 7 When the following conditions are followed, the automatic alkali addition valve (9) is opened, and when the pH value of the alkaline circulating liquid measured by the pH meter (6) is above 9, the automatic alkali addition valve (9) is closed.