CN215570498U

CN215570498U - Chlorine-containing waste gas purification system

Info

Publication number: CN215570498U
Application number: CN202121304945.4U
Authority: CN
Inventors: 蒋伟; 章文贤; 王涛; 王翼鹏
Original assignee: Universtar Science and Technology Shenzhen Co Ltd
Current assignee: Universtar Science and Technology Shenzhen Co Ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-01-18
Anticipated expiration: 2031-06-10

Abstract

The application relates to a chlorine-containing waste gas purification system, which comprises an RTO incinerator, a washing tower, an absorber and an exhaust mechanism which are arranged in sequence; the washing tower comprises a tower main body, an air inlet pipe, an air outlet pipe, a packing layer for purifying waste gas and a circulating cooling mechanism. RTO burns burning furnace and carries out high temperature combustion to waste gas, so that decompose clearance waste gas, waste gas lets in the tower main part through the pipeline in, the sodium hydroxide solution is equipped with in advance to tower main part bottom, circulative cooling mechanism reduces the temperature in the tower main part, spray the sodium hydroxide solution to the packing layer simultaneously, and then it is gaseous to get rid of the HCL in the waste gas, waste gas lets in the adsorber from the scrubbing tower, adsorb dioxin gas in with waste gas through the adsorber, make the waste gas after the purification reach the standard of emission, discharge the gas after will purifying through exhaust mechanism at last, the purifying effect of this system will be improved, the treatment effeciency is high, energy-saving effect is good, no secondary pollution.

Description

Chlorine-containing waste gas purification system

Technical Field

The application relates to the field of purification systems, in particular to a chlorine-containing waste gas purification system.

Background

Chlorine-containing solvents are commonly used as solvents and extracting agents in the pharmaceutical chemical industry, high-concentration waste gas is discharged through a vacuum pump in the production process, and atmospheric environmental pollution is generated if the waste gas is not treated. At present, the treatment of chlorine-containing waste gas is carried out in two ways in a general direction, the first method is a destruction method, namely, carbon-hydrogen bonds of organic matters are broken by adopting an incineration mode, and common equipment comprises a heat accumulating type RTO incinerator, a catalytic combustion furnace, a direct combustion furnace and the like. The second method is a transfer method, which converts the organic matters in the waste gas into a solid or liquid state by adsorption, absorption and condensation methods and then treats the organic matters.

However, according to the characteristics of the waste gas, if the waste gas is treated by adopting an incineration method, HCL can be generated after the waste gas is cracked, so that the waste gas has very strong corrosivity on equipment and has very high requirements on the material of the equipment; the absorption is carried out by adopting an adsorption method, and due to high concentration, the saturation speed of the adsorbent is high, and the use cost is high; although the condensation method can reduce the concentration of the exhaust gas emission theoretically, the condensation method cannot be completed in one step by a condensation process at the technical level to reach the existing emission standard value due to the limitation of the minimum temperature of mechanical condensation.

Regenerative Thermal Oxidation (RTO) is considered as one of the most effective methods for controlling VOCs, and the removal efficiency of VOCs can be 99.97% when the temperature of a combustion chamber is usually over 760 ℃. However, when the regenerative combustion technique is applied to chlorine-containing exhaust gas purification, the generation of dioxin is inevitable. When the combustion technology is applied to control chlorine-containing waste gas, dioxin is required to be used as a monitoring item, and the emission limit value is 0.1ng-TEQ/m 3.

Aiming at the related technologies, the existing technology has the defect of low purification rate due to the low purification rate of the chlorine-containing waste gas.

SUMMERY OF THE UTILITY MODEL

In order to promote chlorine-containing waste gas purification system's purifying effect, make chlorine-containing waste gas discharge to reach standard, this application provides a chlorine-containing waste gas purification system.

The application provides a chlorine-containing waste gas purification system adopts following technical scheme:

a chlorine-containing waste gas purification system comprises an RTO incinerator, a washing tower, an absorber and an exhaust mechanism which are arranged in sequence; the RTO incinerator is used for carrying out high-temperature combustion on waste gas, the washing tower is used for purifying the waste gas discharged from the RTO incinerator, the adsorber is used for purifying the waste gas discharged from the washing tower, and the exhaust mechanism is used for exhausting the purified gas to the outside; the RTO incinerator, the washing tower, the absorber and the exhaust mechanism are all connected through pipelines; the washing tower comprises a tower main body, an inlet pipe, an outlet pipe, a packing layer and a circulating cooling mechanism, wherein the packing layer is used for purifying waste gas, the inlet pipe is arranged at the lower end of the side wall of the tower main body, one end, far away from the tower main body, of the inlet pipe is connected with the incinerator, the outlet pipe is arranged at the upper end of the tower main body, one end, far away from the tower main body, of the outlet pipe is connected with the adsorber, the packing layer is arranged in the washing tower, the circulating cooling mechanism is externally connected with the tower main body, and the circulating cooling mechanism is used for reducing the temperature of the packing layer.

Through adopting above-mentioned technical scheme, RTO burns burning furnace and carries out high temperature combustion to waste gas, so that decompose the clearance waste gas, waste gas lets in the tower main part through the pipeline in, the sodium hydroxide solution is equipped with in advance to tower main part bottom, circulating cooling mechanism reduces the temperature in the tower main part, spray the sodium hydroxide solution to the packing layer simultaneously, and then get rid of the HCL gas in the waste gas, waste gas lets in the adsorber from the scrubbing tower, adsorb dioxin gas in with waste gas through the adsorber, make the waste gas after the purification reach the standard of emission, discharge the gas after will purifying through exhaust mechanism at last, the purifying effect of this system will be improved, the treatment effeciency is high, energy-conserving effectual, no secondary pollution.

Optionally, the adsorber includes adsorption tank and the active carbon that is used for adsorbing the waste gas, the active carbon set up in adsorb in.

Through adopting above-mentioned technical scheme, activated carbon adopts granule carbon, utilizes granule carbon specific surface area bigger, and dioxin gas is adsorbed to the performance that adsorption effect is good, and then promotes absorptive ability, improves the effect of purifying.

Optionally, a demister is arranged in the tower main body and is located above the packing layer.

Through adopting above-mentioned technical scheme, the defroster sets up in the top of packing layer, and the defroster is got rid of liquid in with waste gas to in reducing the water content in the waste gas, so that let in the gas in the adsorption tank drier, carry the adsorption efficiency of adsorber, promote the purifying effect of this system

Optionally, the demister adopts a mode of combining a baffle plate and a wire mesh.

Through adopting above-mentioned technical scheme, the mode that the defroster adopted baffling board and silk screen combination utilizes baffling board and silk screen so that get rid of the liquid in the waste gas, promotes the suitability of this system to in the purifying effect who promotes this system, the environmental protection.

Optionally, the circulating cooling mechanism includes a circulating pipeline externally connected to the tower main body, a nozzle for spraying the packing layer, and a circulating pump for driving liquid in the circulating pipeline to flow; the circulating pump connect in circulating line, circulating line keeps away from washing tower bottom one end wears to locate the outer wall of tower main part, the nozzle set up in the top of packing layer just the opening orientation of nozzle in the packing layer.

Through adopting above-mentioned technical scheme, the top of packing layer is transported to the sodium hydroxide solution in with the tower main part through the circulating pump to utilize the nozzle to spray the packing layer, realize on the one hand with the reverse contact of waste gas, on the other hand reduces the temperature in the tower main part to below 40 ℃, thereby improves the effect of purifying waste gas.

Optionally, the RTO incinerator is composed of a combustion chamber, a regenerator arranged in the RTO incinerator, a purging pipe connected to the regenerator, a poppet valve for controlling air intake and air exhaust, a burner for burning waste gas in the RTO incinerator, an air intake pipe, an exhaust pipe, and other parts; the number of the poppet valves is two, one poppet valve is used for controlling air inlet, the other poppet valve is used for controlling air outlet, the two poppet valves are connected to the purging pipe, the air inlet pipe and the air outlet pipe are connected to the poppet valves, and one end, which is not connected with the poppet valves, of the air outlet pipe is connected to the air inlet pipe; the regenerative chamber is communicated with the combustion chamber, and the combustor is connected to the wall of the incinerator.

Through adopting above-mentioned technical scheme, the intake pipe lets in waste gas in the stove main part, and the combustor heats the interior gas of combustion chamber, makes waste gas burn for the burning temperature in the stove main part is about 800 ℃, and then burns harmful gas in with waste gas and gets rid of, and waste gas purification is discharged from the blast pipe through the gas after poppet valve will burn, makes the flow of the waste gas after this system discharge purifies control.

Optionally, the regenerator comprises outer frame and heat accumulation pottery, the regenerator is provided with a plurality of, it is right to sweep the pipe the regenerator sweeps.

Through adopting above-mentioned technical scheme, highly-compressed air sweeps the regenerator through sweeping the pipe, will keep in the part in the regenerator and remain unpurified waste gas blowback and carry out incineration disposal in the stove main part, improves purifying effect.

Optionally, the burner is a low-nitrogen burner.

By adopting the technical scheme, the low-nitrogen combustor is adopted to reduce the generation amount of secondary pollutants, reduce energy consumption and protect the environment.

Optionally, the exhaust mechanism includes a fan for flowing gas and a chimney for collecting exhaust gas; the air inlet of the fan is connected with the adsorption box through a pipeline, and the air exhaust of the fan is connected with the chimney through a pipeline.

Through adopting above-mentioned technical scheme, the fan provides power, outwards arranges the gas in the adsorption tank to the gaseous gathering after the purification is in the chimney, outwards discharges through the chimney, realizes that this system discharges the gas after the purification, the environmental protection.

In summary, the present application includes at least one of the following beneficial technical effects:

the method comprises the following steps that 1, an RTO incinerator burns waste gas at high temperature so as to decompose and clean the waste gas, the waste gas is introduced into a tower main body through a pipeline, a sodium hydroxide solution is pre-filled at the bottom of the tower main body, a circulating cooling mechanism reduces the temperature in the tower main body, the sodium hydroxide solution is sprayed on a packing layer at the same time, HCL gas in the waste gas is removed, the waste gas is introduced into an absorber from a washing tower, dioxin gas in the waste gas is absorbed through the absorber, the purified waste gas reaches the emission standard, and finally the purified gas is discharged through an exhaust mechanism, so that the purification effect of the system is improved, the treatment efficiency is high, the energy-saving effect is good, and no secondary pollution exists;

2. the low-nitrogen combustor is adopted to reduce the generation amount of secondary pollutants, reduce energy consumption and protect the environment.

Drawings

FIG. 1 is a schematic structural diagram for showing the system according to the embodiment of the present application;

fig. 2 is a schematic diagram for showing a circulating cooling mechanism according to an embodiment of the present application.

Description of reference numerals: 1. an RTO incinerator; 11. a furnace main body; 12. a purge tube; 13. a poppet valve; 14. a burner; 15. an air inlet pipe; 16. an exhaust pipe; 17. a combustion chamber; 18. a regenerator; 181. an outer frame; 182. a heat-accumulating ceramic; 2. a washing tower; 21. a tower main body; 22. entering an air pipe; 23. an air outlet pipe; 24. a filler layer; 3. an adsorber; 31. an adsorption tank; 32. activated carbon; 4. an exhaust mechanism; 41. a fan; 42. a chimney; 5. a circulating cooling mechanism; 51. a circulation pipe; 52. a nozzle; 53. a circulation pump; 61. a demister.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses chlorine-containing waste gas purification system. Referring to fig. 1, a chlorine-containing waste gas purification system comprises an RTO incinerator 1, a scrubber 2, an adsorber 3 and an exhaust mechanism 4, which are sequentially arranged, wherein the RTO incinerator 1, the scrubber 2, the adsorber 3 and the exhaust mechanism 4 are all connected through a pipeline. The washing tower 2 comprises a tower main body 21, an air inlet pipe 22, an air outlet pipe 23, a packing layer 24 for purifying waste gas and a circulating cooling mechanism 5, wherein the air inlet pipe 22 is integrally formed at the lower end of the side wall of the tower main body 21, one end of the air inlet pipe, which is far away from the tower main body 21, is connected with the incinerator, the air outlet pipe 23 is integrally formed at the upper end of the tower main body 21, and one end of the air outlet pipe, which is far away from the tower main body 21, is connected with the adsorber 3. The packing layer 24 is disposed in the washing tower 2, the circulating cooling mechanism 5 is used for reducing the temperature of the packing layer 24, the circulating cooling mechanism 5 is externally connected to the tower main body 21, the packing layer 24 is close to the air inlet pipe 22, in the embodiment, the packing layer 24 is a pall ring, which is only illustrated here by way of example, and the material of the packing layer 24 is not limited.

Burn burning furnace 1 through RTO and carry out high temperature combustion to chlorine-containing waste gas, so that get rid of the harmful gas in the chlorine-containing waste gas, the purge gas after burning enters into in the scrubbing tower 2 from going into trachea 22 through the pipeline, gas moves toward the direction of outlet duct 23, under the effect of circulative cooling mechanism 5, so that reduce the temperature in the tower main part 21, gas passes packing layer 24, the realization is cooled down to waste gas, promote purifying effect, later adsorb gas through adsorber 3, make the waste gas after the purification reach the standard of emission, discharge the gas after purifying through exhaust mechanism 4 at last, the purifying effect of this system will be improved, high treatment effeciency, energy-saving effect is good, no secondary pollution.

Referring to the figure, the circulation cooling mechanism 5 includes a circulation line 51 externally connected to the tower main body 21, a nozzle 52 for spraying the packing layer 24, and a circulation pump 53 for driving the liquid in the circulation line 51 to flow. The circulating pump 53 is connected to the circulating pipeline 51, one end of the circulating pipeline 51 far from the bottom of the washing tower 2 penetrates through the outer wall of the tower main body 21, the nozzle 52 is connected to the circulating pipeline 51, the nozzle 52 is arranged in the tower main body 21 and located above the packing layer 24, and the opening of the nozzle 52 faces the packing layer 24. The bottom of the tower main body 21 is pre-loaded with a 30% sodium hydroxide solution, the sodium hydroxide solution in the tower main body 21 is transported to the upper part of the packing layer 24 through a circulating pump 53, and the packing layer 24 is sprayed by using a nozzle 52, so that reverse contact with waste gas is realized, and the temperature in the tower main body 21 is reduced to below 40 ℃, so that the waste gas purification effect is improved.

The adsorber 3 comprises an adsorption tank 31 and activated carbon 32 for adsorbing the waste gas, the activated carbon 32 is arranged in the adsorption tank 31, and one end of the gas outlet pipe 23 far away from the tower main body 21 is connected with the adsorption tank 31 through a pipeline. In the embodiment of the present application, the activated carbon 32 is granular carbon, which is only illustrated here by way of example and is not intended to limit the material of the activated carbon 32. Be provided with defroster 61 in the tower main part 21, defroster 61 and the inner wall of tower main part 21 are connected, and defroster 61 is located the top of packing layer 24, and defroster 61 adopts the mode of baffling board and silk screen combination. Adsorb the water smoke from packing layer 24 outflow gas through defroster 61 to reduce the water content of the gas that flows out in the tower main part 21, improve activated carbon 32's adsorption efficiency, promote the effect of purifying waste gas, so that make gas reach the standard of emission.

The exhaust mechanism 4 includes a fan 41 for flowing gas and a chimney 42 for collecting exhaust gas, an air intake part of the fan 41 is connected to the adsorption tank 31 through a pipeline, and an air exhaust part of the fan 41 is connected to the chimney 42 through a pipeline. The fan 41 is arranged at the end of the purification system so that the pipe in front of the purification system is in a negative pressure state to prevent the exhaust gas from leaking into the environment. The fan 41 flows the gas in the adsorption tank 31 outwards, and the purified gas is gathered in the chimney 42 and discharged outwards through the chimney 42, so that the system discharges the purified gas and protects the environment.

The RTO incinerator 1 is composed of a furnace body 11, a purge pipe 12, a poppet valve 13 for controlling the supply or discharge of air, a burner 14 for burning the exhaust gas in the RTO incinerator 1, an air supply pipe 15, and an exhaust pipe 16. The furnace body 11 is provided with a combustion chamber 17 and a regenerative chamber 18, the regenerative chamber 18 is located below the combustion chamber 17 and is communicated with each other, and the burner 14 is connected to a wall of the furnace body 11 for heating the exhaust gas in the combustion chamber 17. The purging pipe 12 is connected to the regenerator 18, and the two are communicated with each other, the RTO incinerator 1 is of a three-bed structure, in the embodiment of the application, the poppet valve 13 is provided with 6 sets, wherein 3 sets are used for controlling inlet air and are set as inlet poppet valves, the other 3 sets are used for controlling outlet air and are set as outlet poppet valves, and 1 set of inlet air lifting valve and 1 set of outlet air lifting valve are installed and used with the purging pipe 12 in a matching manner. The intake pipe 15 is connected to the intake poppet valve by using bolts, the exhaust pipe 16 is connected to the exhaust poppet valve by using bolts, and the end of the exhaust pipe 16 to which the poppet valve 13 is not connected is connected to the intake pipe 22 by using bolts. The gas inlet pipe 15 introduces the waste gas into the furnace main body 11, the combustor 14 heats the gas in the combustion chamber 17 to burn the waste gas, so that the incineration temperature in the furnace main body 11 is about 800 ℃, further, harmful gas in the waste gas is burnt and removed, the waste gas is purified, the burnt gas is discharged from the exhaust pipe 16 through the poppet valve 13, and the flow of the purified waste gas discharged by the system is controlled.

The heat storage chamber 18 is composed of an outer frame 181 and heat storage ceramics 182, a plurality of heat storage chambers 18 are arranged, and the purging pipes 12 purge the heat storage chambers 18. The heat storage chamber 18 at least comprises 3 heat storage bed layers, and is switched according to specific time, and heat storage-heat release-purging processes are carried out in turn, and the switching time is 60-180 s. Part of heat of the flue gas is stored by the heat storage ceramic 182 and is used for preheating the waste gas, the heat storage ceramic 182 adopts plate type honeycomb ceramic, the heat shock resistance and the heat stress resistance are strong, the damage is not easy to occur, and the heat recovery efficiency can reach more than 95%. The high-pressure air purges the regenerator 18 through the purging pipe 12, and the part of the residual unpurified waste gas temporarily stored in the regenerator 18 is blown back into the furnace main body 11 for incineration treatment, so that the purification effect is improved.

The burner 14 adopts the low-nitrogen burner 14, and the low-nitrogen burner 14 is adopted to reduce the generation amount of secondary pollutants, reduce energy consumption and protect the environment.

The implementation principle of the chlorine-containing waste gas purification system in the embodiment of the application is as follows: burn burning furnace 1 through RTO and carry out high temperature combustion to chlorine-containing waste gas, so that get rid of the harmful gas in the chlorine-containing waste gas, the purge gas after burning enters into in the scrubbing tower 2 from going into trachea 22 through the pipeline, gas moves toward the direction of outlet duct 23, under the effect of circulative cooling mechanism 5, so that reduce the temperature in the tower main part 21, gas passes packing layer 24, the realization is cooled down to waste gas, promote purifying effect, later adsorb gas through adsorber 3, make the waste gas after the purification reach the standard of emission, discharge the gas after purifying through exhaust mechanism 4 at last, the purifying effect of this system will be improved, high treatment effeciency, energy-saving effect is good, no secondary pollution.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A chlorine-containing waste gas purification system is characterized in that: comprises an RTO incinerator (1), a washing tower (2), an absorber (3) and an exhaust mechanism (4) which are sequentially communicated; the RTO incinerator (1) is used for carrying out high-temperature combustion on waste gas, the washing tower (2) is used for purifying the waste gas coming out of the RTO incinerator (1), the adsorber (3) is used for purifying the waste gas coming out of the washing tower (2), and the exhaust mechanism (4) is used for exhausting the purified gas to the outside; the washing tower (2) comprises a tower main body (21), an air inlet pipe (22), an air outlet pipe (23), a packing layer (24) and a circulating cooling mechanism (5), wherein the air inlet pipe (22) is arranged at the lower end of the side wall of the tower main body (21), one end, far away from the tower main body (21), of the air inlet pipe is connected with the incinerator, the air outlet pipe (23) is arranged at the upper end of the tower main body (21), one end, far away from the tower main body (21), of the air outlet pipe is connected with the adsorber (3), the packing layer (24) is arranged in the washing tower (2), the circulating cooling mechanism (5) is externally connected with the tower main body (21), and the circulating cooling mechanism (5) is used for reducing the temperature of the packing layer (24).

2. The system according to claim 1, wherein: the adsorber (3) comprises an adsorption tank (31) and activated carbon (32) for adsorbing waste gas, wherein the activated carbon (32) is arranged in the adsorption tank (31).

3. The system according to claim 1, wherein: a demister (61) is arranged in the tower main body (21), and the demister (61) is positioned above the packing layer (24).

4. A chlorine-containing exhaust gas purification system according to claim 3, wherein: the demister (61) adopts a mode of combining a baffle plate and a wire mesh.

5. The system according to claim 4, wherein: the circulating cooling mechanism (5) comprises a circulating pipeline (51) externally connected with the tower main body (21), a nozzle (52) used for spraying the packing layer (24) and a circulating pump (53) used for driving liquid of the circulating pipeline (51) to flow; the circulating pump (53) is connected to the circulating pipeline (51), one end of the circulating pipeline (51) far away from the bottom of the washing tower (2) penetrates through the outer wall of the tower main body (21), the nozzle (52) is arranged above the packing layer (24), and the opening of the nozzle (52) faces the packing layer (24).

6. The system according to claim 1, wherein: the RTO incinerator (1) consists of a combustion chamber (17), a heat storage chamber (18) arranged in the RTO incinerator (1), a purging pipe (12) connected with the heat storage chamber (18), a poppet valve (13) used for controlling air inlet and air outlet, a burner (14) used for combusting waste gas in the RTO incinerator (1), an air inlet pipe (15) and an exhaust pipe (16); the two poppet valves (13) are arranged, one is used for controlling air inlet, the other is used for controlling air outlet, the two poppet valves (13) are connected to the purging pipe (12), the air inlet pipe (15) and the air outlet pipe (23) are connected to the poppet valves (13), and one ends, which are not connected with the poppet valves (13), of the air outlet pipes (23) are connected to the air inlet pipe (22); the regenerator (18) is in communication with the combustion chamber (17), and the burner (14) is attached to the wall of the incinerator.

7. The system according to claim 6, wherein: the heat storage chamber (18) is composed of an outer frame (181) and heat storage ceramics (182), the heat storage chamber (18) is provided with a plurality of heat storage pipes, and the purging pipes (12) are used for purging the heat storage chamber (18).

8. The system according to claim 7, wherein: the combustor (14) adopts a low-nitrogen combustor (14).

9. The system according to claim 2, wherein: the exhaust mechanism (4) comprises a fan (41) for flowing gas and a chimney (42) for gathering exhaust gas; the air inlet part of the fan (41) is connected with the adsorption box (31) through a pipeline, and the air outlet part of the fan (41) is connected with the chimney (42) through a pipeline.