Tail gas purification and recovery system for impregnated carbon calcining furnace

By designing a multi-layer impregnated carbon calciner exhaust purification and recycling system, the problems of carbon powder and heavy metal pollution in the exhaust gas and ammonia loss are solved, multiple treatments of exhaust gas and recycling of wastewater are achieved, and the goals of environmental protection and economicality are achieved. .

CN222279377UActive Publication Date: 2024-12-31HUBEI HUAQIANG HIGH TECH CO LTD
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Patent Information

Application Number
CN202420758545.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-12
Publication Date
2024-12-31
Estimated Expiration
2034-04-12

AI Technical Summary

Technical Problem

The exhaust gas generated during the calcination of impregnated carbon contains a large amount of carbon powder and heavy metal pollutants. If direct emissions are discharged, it will have a serious impact on the ecological environment and the ammonia gas is lost, making it difficult for the existing technology to effectively purify and recycle, resulting in environmental protection and economic problems.

Method used

Design an impregnated carbon calciner furnace exhaust purification and recovery system including dust removal subsystem, water washing subsystem and liquid phase recovery subsystem. By processing harmful substances in the exhaust gas multiple times, the water washing and gas phase recovery subsystems are used to recover ammonia and Aimmonia water with a concentration of up to standard is formed, and the liquid phase recovery subsystem completely recycles the wastewater.

Benefits of technology

The centralized treatment of harmful substances in the exhaust gas and zero discharge of wastewater have been achieved, production costs have been reduced, and ammonia loss has been effectively reduced through multiple washing absorption and recycling technologies, achieving environmental protection and economic goals.

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Abstract

A tail gas purification and recovery system for an impregnated carbon calcining furnace comprises a dust removal subsystem, a water washing subsystem, a gas phase recovery subsystem and a liquid phase recovery subsystem, a gas inlet of the dust removal subsystem is communicated with a gas inlet pipe, all devices in the dust removal subsystem are communicated with one another through a first conveying pipe, and the dust removal subsystem is communicated with the water washing subsystem through a second conveying pipe. All the devices in the water washing subsystem are communicated with one another through a second conveying pipe, the water washing subsystem is communicated with the gas phase recovery subsystem and all the devices in the system through a third conveying pipe, and the water washing subsystem is communicated with the liquid phase recovery subsystem and all the devices in the system through a fourth conveying pipe; the gas phase recovery subsystem is communicated with the water washing subsystem through a first return pipe, and the liquid phase recovery subsystem is communicated with the water washing subsystem through a second return pipe; according to the calcining tail gas recycling device, calcining tail gas can be treated and recycled for multiple times, the environment-friendly requirement is met, meanwhile, ammonia gas in the tail gas can be recycled, and the production cost is effectively reduced.
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Description

Technical Field

[0001] The utility model belongs to the field of tail gas purification and environmental protection systems, in particular to a tail gas purification and recovery system for an impregnated carbon calcining furnace. Background Art

[0002] Special impregnated carbon used in the field of chemical defense can effectively protect against various classic toxic agents. After being loaded into protective equipment such as filter absorbers, gas filter canisters, and gas filter boxes, it can effectively filter and purify toxic gases and industrial harmful gases in the contaminated air to ensure the normal work and life of personnel.

[0003] Impregnated carbon is usually made by calcining raw materials at high temperature in a calcining furnace. The tail gas generated during the calcination of impregnated carbon contains a large amount of carbon powder, ammonia and heavy metal pollutants. If it is directly discharged into the atmosphere, it will have a serious impact on the ecological environment. The ammonia contained in the tail gas will also be lost in large quantities. Therefore, it is necessary to design an impregnated carbon calcining furnace tail gas purification and recovery system to convert the carbon powder and heavy metals in the tail gas into solid waste for separation, and then recycle the ammonia in the tail gas for reuse, so as to achieve the purpose of energy saving, environmental protection and zero wastewater discharge. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the utility model provides an impregnated carbon calcining furnace tail gas purification and recovery system, which can process and recover the calcination tail gas multiple times, not only meeting the environmental protection requirements, but also can recycle the ammonia in the tail gas, effectively reducing the production cost.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions to achieve:

[0006] A tail gas purification and recovery system for an impregnated carbon calcining furnace includes a dust removal subsystem, a water washing subsystem, a gas phase recovery subsystem and a liquid phase recovery subsystem. The air inlet of the dust removal subsystem is connected to the air inlet pipe, and the various devices in the dust removal subsystem are interconnected through a first conveying pipe. The dust removal subsystem is connected to the water washing subsystem through a second conveying pipe. The various devices in the water washing subsystem are interconnected through a second conveying pipe. The water washing subsystem is connected to the gas phase recovery subsystem and the various devices in the system through a third conveying pipe. The water washing subsystem is connected to the liquid phase recovery subsystem and the various devices in the system through a fourth conveying pipe. The gas phase recovery subsystem is connected to the water washing subsystem through a first reflux pipe, and the liquid phase recovery subsystem is connected to the water washing subsystem through a second reflux pipe.

[0007] In a preferred embodiment, the dust removal subsystem includes a primary heat exchanger, a primary dust collector, a secondary dust collector and a secondary heat exchanger; the air inlet of the primary heat exchanger is connected to the air inlet pipe, the air outlet pipe of the primary heat exchanger is connected to the first delivery pipe, the first delivery pipe is connected to the primary dust collector, the secondary dust collector and the secondary heat exchanger in sequence, the primary dust collector and the secondary dust collector are connected to dust exhaust pipes, and the end of the secondary heat exchanger is connected to the water washing subsystem through the second delivery pipe.

[0008] In a preferred embodiment, the water washing subsystem includes a primary water washing tower, a secondary water washing tower, a raw water tank and a vaporization tower; the air inlet of the primary water washing tower is connected to the secondary heat exchanger through a second delivery pipe, the second delivery pipe is connected to the secondary water washing tower, the raw water tank and the vaporization tower in sequence, the gas phase outlet of the vaporization tower is connected to the gas phase recovery subsystem through a third delivery pipe, and the liquid phase outlet of the vaporization tower is connected to the liquid phase recovery subsystem through a fourth delivery pipe.

[0009] In a preferred embodiment, the gas phase recovery subsystem includes an ammonia enrichment tower and an ammonia water recovery tank. The air inlet of the ammonia enrichment tower is connected to the vaporization tower through a third delivery pipe, the liquid outlet of the ammonia enrichment tower is connected to the ammonia water recovery tank through a third delivery pipe, and the air outlet of the ammonia enrichment tower is connected to the secondary water washing tower through a first reflux pipe.

[0010] In the preferred scheme, the liquid phase recovery subsystem includes a three-stage heat exchanger, a liquefaction buffer tank, a liquefaction sedimentation tank, a filter press and a return water buffer tank; the liquid inlet of the three-stage heat exchanger is connected to the vaporization tower through a fourth delivery pipe, and the fourth delivery pipe is connected to the liquefaction buffer tank, the liquefaction sedimentation tank, the filter press and the return water buffer tank in sequence, and the liquid outlet of the return water buffer tank is connected to the primary water washing tower through a second reflux pipe.

[0011] An impregnated carbon calcining furnace tail gas purification and recovery system can achieve the following beneficial effects:

[0012] 1. This system can recover and centrally treat harmful substances in tail gas by treating and recycling tail gas. The treated tail gas can meet environmental protection requirements, and the treated wastewater can be completely recycled by the system, achieving the goal of zero wastewater discharge;

[0013] 2. This system can wash and absorb the ammonia in the tail gas for multiple times. The recovered ammonia will eventually form ammonia water with a concentration that meets the standard and be reused in other processes, effectively saving the input of raw materials and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the overall principle of the tail gas purification and recovery system of the impregnated carbon calcining furnace of the utility model;

[0016] Figure 2 This is a schematic diagram of the dust removal subsystem principle of the utility model;

[0017] Figure 3 This is a schematic diagram of the principle of the water washing subsystem of the utility model;

[0018] Figure 4 This is a schematic diagram of the principle of the gas phase / liquid phase recovery subsystem of the utility model.

[0019] In the figure: dust removal subsystem 1, primary heat exchanger 101, primary dust collector 102, secondary dust collector 102, dust exhaust pipe 104, secondary heat exchanger 105, water washing subsystem 2, primary water washing tower 201, secondary water system tower 202, raw water tank 203, vaporization tower 204, gas phase recovery subsystem 3, ammonia enrichment tower 301, recovery ammonia water tank 302, liquid phase recovery subsystem 4, tertiary heat exchanger 401, liquefaction buffer tank 402, liquefaction sedimentation tank 403, filter press 404, return water buffer tank 405, air inlet pipe 5, first delivery pipe 6, second delivery pipe 7, third delivery pipe 8, fourth delivery pipe 9, first reflux pipe 10, second reflux pipe 11. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, a tail gas purification and recovery system for an impregnated carbon calcining furnace includes a dust removal subsystem 1, a water washing subsystem 2, a gas phase recovery subsystem 3 and a liquid phase recovery subsystem 4. The air inlet of the dust removal subsystem 1 is connected to an air inlet pipe 5, and the various devices in the dust removal subsystem 1 are interconnected through a first conveying pipe 6. The dust removal subsystem 1 is connected to the water washing subsystem 2 through a second conveying pipe 7. The various devices in the water washing subsystem 2 are interconnected through the second conveying pipe 7. The water washing subsystem 2 is connected to the gas phase recovery subsystem 3 and various devices in the system through a third conveying pipe 8. The water washing subsystem 2 is connected to the liquid phase recovery subsystem 4 and various devices in the system through a fourth conveying pipe 9. The gas phase recovery subsystem 3 is connected to the water washing subsystem 2 through a first reflux pipe 10, and the liquid phase recovery subsystem 4 is connected to the water washing subsystem 2 through a second reflux pipe 11.

[0021] The waste gas generated by the calcining furnace can be dedusted by the dust removal subsystem 1, and the tail gas temperature is adjusted to a suitable temperature before being transported to the water washing subsystem 2. After multi-stage water washing, the tail gas is separated into ammonia-containing gas phase and liquid phase. Finally, the ammonia-containing gas phase is treated by the gas phase recovery subsystem 3 to form ammonia water that meets the standard concentration for reuse in other processes. The ammonia that cannot be completely recovered is returned to the water washing subsystem 2 for reuse; the liquid phase is filtered and treated by the liquid phase recovery subsystem 4. The ammonia nitrogen and heavy metals in the treated return water have been effectively removed and can be fully reused in the water washing subsystem 2 for repeated use, thereby realizing a zero wastewater discharge process.

[0022] The preferred solution is Figure 2As shown, the dust removal subsystem 1 includes a primary heat exchanger 101, a primary dust collector 102, a secondary dust collector 103 and a secondary heat exchanger 105; the air inlet of the primary heat exchanger 101 is connected to the air inlet pipe 5, the air outlet pipe of the primary heat exchanger 101 is connected to the first delivery pipe 6, the first delivery pipe 6 is connected to the primary dust collector 102, the secondary dust collector 103 and the secondary heat exchanger 105 in sequence, the primary dust collector 102 and the secondary dust collector 103 are connected to the dust exhaust pipe 104, and the end of the secondary heat exchanger 105 is connected to the water washing subsystem 2 through the second delivery pipe 7;

[0023] The primary heat exchanger 101 in the system is used to cool down the high-temperature tail gas of the boiling furnace to ensure that the relevant tail gas is lower than 80°C when entering the dust collector, so as to ensure that the dust collector is not affected by high temperature. The primary heat exchanger 101 uses cooling water for cooling, and the cooling water is uniformly supplied by the cooling tower of the production line; the secondary heat exchanger 105 is used to cool down the tail gas at the outlet of the secondary dust collector 103, so that the tail gas temperature drops to about 25°C, so that the solubility of ammonia in the tail gas in water is optimal;

[0024] The primary dust collector 102 in the system is used to remove large dust particles in the exhaust gas of the boiling furnace, and the secondary dust collector 103 is used to remove small dust particles in the exhaust gas of the boiling furnace. The dust collected by the primary dust collector 102 and the secondary dust collector 103 is regularly sent out for treatment as solid waste through the dust exhaust pipe 104.

[0025] The preferred solution is Figure 2 As shown, the water washing subsystem 2 includes a primary water washing tower 201, a secondary water washing tower 202, a raw water tank 203 and a vaporizing tower 204; the air inlet of the primary water washing tower 201 is connected to the secondary heat exchanger 105 through the second delivery pipe 7, the second delivery pipe 7 is connected to the secondary water washing tower 202, the raw water tank 203 and the vaporizing tower 204 in sequence, the gas phase outlet of the vaporizing tower 204 is connected to the gas phase recovery subsystem 3 through the third delivery pipe 8, and the liquid phase outlet of the vaporizing tower 204 is connected to the liquid phase recovery subsystem 4 through the fourth delivery pipe 9;

[0026] The primary water scrubber 201 in the system is used to absorb a large amount of ammonia in the tail gas. The primary water scrubber 201 uses tap water and return water from the device for water replenishment; the secondary water scrubber 202 is used to further absorb ammonia in the tail gas to ensure that the ammonia in the tail gas meets the discharge standards. The ammonia-containing wastewater that has absorbed ammonia (with a density that meets the standards) is transferred to the raw water tank 203 for standby use; the raw water tank 203 is used to absorb the ammonia-containing wastewater discharged from the tower to adjust the production rhythm;

[0027] The vaporizer 204 in the system is used to heat and deammoniate the ammonia-containing wastewater in the raw water tank 203, and the temperature of the vaporizer 204 is maintained above 85°C. The vaporizer 204 has two heating methods: boiling furnace tail gas heating and electric heating. The two heating methods can be used alone or in combination, and the temperature is automatically controlled by PLC.

[0028] The preferred solution is Figure 3 As shown, the gas phase recovery subsystem 3 includes an ammonia enrichment tower 301 and an ammonia water recovery tank 302, the air inlet of the ammonia enrichment tower 301 is connected to the vaporization tower 204 through the third delivery pipe 8, the liquid outlet of the ammonia enrichment tower 301 is connected to the ammonia water recovery tank 302 through the third delivery pipe 8, and the air outlet of the ammonia enrichment tower 301 is connected to the secondary water washing tower 202 through the first reflux pipe 10;

[0029] A large amount of ammonia evaporated from the vaporization tower 204 enters the ammonia enrichment tower 301 through the ejector for continuous enrichment, and finally forms ammonia water with a concentration that meets the standard and is recycled to the ammonia water tank 302 for storage and reuse in other processes; the excess ammonia in the ammonia enrichment tower 301 is transported to the secondary water washing tower 202 through the first reflux pipe 10 for repeated recycling.

[0030] The preferred solution is Figure 4 As shown, the liquid phase recovery subsystem 4 includes a three-stage heat exchanger 401, a liquefaction buffer tank 402, a liquefaction sedimentation tank 403, a filter press 404 and a return water buffer tank 405; the liquid inlet of the three-stage heat exchanger 401 is connected to the vaporization tower 204 through the fourth delivery pipe 9, and the fourth delivery pipe 9 is connected to the liquefaction buffer tank 402, the liquefaction sedimentation tank 403, the filter press 404 and the return water buffer tank 405 in sequence, and the liquid outlet of the return water buffer tank 405 is connected to the primary water washing tower 201 through the second reflux pipe 11;

[0031] The three-stage heat exchanger 401 in the system is used to cool the residual water after deammoniation in the vaporization tower 204. The deammonified water after cooling contains heavy metals and a very small amount of ammonia nitrogen substances. It is transported to the liquefaction sedimentation tank 403 through the fourth delivery pipe 9 and flocculants and other substances are added to precipitate the heavy metals in the residual water. The heavy metals in the sedimentation tank are then filtered through the filter press 404 to form solid waste for external treatment. The treated deammonified water is finally stored in the return water buffer tank 405. This part of the water has been freed of ammonia nitrogen and heavy metals, and is all recycled to the primary water washing tower through the second reflux pipe 11 as a supplementary water source.

Claims

1. A tail gas purification and recovery system for an impregnated carbon calcining furnace, comprising a dust removal subsystem (1), a water washing subsystem (2), a gas phase recovery subsystem (3) and a liquid phase recovery subsystem (4), characterized in that: The air inlet of the dust removal subsystem (1) is connected to the air inlet pipe (5); the primary heat exchanger (101), the primary dust collector (102), the secondary dust collector (103) and the secondary heat exchanger (105) in the dust removal subsystem (1) are connected to each other via a first delivery pipe (6); the dust removal subsystem (1) is connected to the water washing subsystem (2) via a second delivery pipe (7). The primary water washing tower (201), the secondary water washing tower (202), the raw water tank (203) and the vaporization tower (204) in the water washing subsystem (2) are interconnected via a second delivery pipe (7). The water washing subsystem (2) is connected to the ammonia enrichment tower (301) and the ammonia water recovery tank (302) in the gas phase recovery subsystem (3) through the third delivery pipe (8). The water washing subsystem (2) is connected to the three-stage heat exchanger (401), the liquefaction buffer tank (402), the liquefaction sedimentation tank (403), the filter press (404) and the return water buffer tank (405) in the liquid phase recovery subsystem (4) through the fourth delivery pipe (9). The gas phase recovery subsystem (3) is connected to the water washing subsystem (2) via a first reflux pipe (10), and the liquid phase recovery subsystem (4) is connected to the water washing subsystem (2) via a second reflux pipe (11).

2. The tail gas purification and recovery system of the impregnated carbon calcining furnace according to claim 1 is characterized in that: The dust removal subsystem (1) comprises a primary heat exchanger (101), a primary dust collector (102), a secondary dust collector (103) and a secondary heat exchanger (105); the air inlet of the primary heat exchanger (101) is connected to an air inlet pipe (5), the air outlet pipe of the primary heat exchanger (101) is connected to a first delivery pipe (6), the first delivery pipe (6) is connected to the primary dust collector (102), the secondary dust collector (103) and the secondary heat exchanger (105) in sequence, the primary dust collector (102) and the secondary dust collector (103) are connected to a dust exhaust pipe (104), and the end of the secondary heat exchanger (105) is connected to the water washing subsystem (2) via a second delivery pipe (7).

3. The tail gas purification and recovery system of the impregnated carbon calcining furnace according to claim 2 is characterized in that: The water washing subsystem (2) comprises a primary water washing tower (201), a secondary water washing tower (202), a raw water tank (203) and a vaporizing tower (204); the air inlet of the primary water washing tower (201) is connected to the secondary heat exchanger (105) via a second delivery pipe (7); the second delivery pipe (7) is connected to the secondary water washing tower (202), the raw water tank (203) and the vaporizing tower (204) in sequence; the gas phase outlet of the vaporizing tower (204) is connected to the gas phase recovery subsystem (3) via a third delivery pipe (8); and the liquid phase outlet of the vaporizing tower (204) is connected to the liquid phase recovery subsystem (4) via a fourth delivery pipe (9).

4. The tail gas purification and recovery system of the impregnated carbon calcining furnace according to claim 3 is characterized in that: The gas phase recovery subsystem (3) comprises an ammonia enrichment tower (301) and an ammonia water recovery tank (302); the gas inlet of the ammonia enrichment tower (301) is connected to the vaporization tower (204) via a third delivery pipe (8); the liquid outlet of the ammonia enrichment tower (301) is connected to the ammonia water recovery tank (302) via the third delivery pipe (8); and the gas outlet of the ammonia enrichment tower (301) is connected to the secondary water washing tower (202) via a first reflux pipe (10).

5. The tail gas purification and recovery system of the impregnated carbon calcining furnace according to claim 3 is characterized in that: The liquid phase recovery subsystem (4) comprises a three-stage heat exchanger (401), a liquefaction buffer tank (402), a liquefaction sedimentation tank (403), a filter press (404) and a return water buffer tank (405); the liquid inlet of the three-stage heat exchanger (401) is connected to the vaporization tower (204) via a fourth delivery pipe (9); the fourth delivery pipe (9) is connected to the liquefaction buffer tank (402), the liquefaction sedimentation tank (403), the filter press (404) and the return water buffer tank (405) in sequence; the liquid outlet of the return water buffer tank (405) is connected to the primary water washing tower (201) via a second reflux pipe (11).