Odor purification system for down-flow pot-type calcining furnace

Abstract

The utility model relates to the technical field of environmental protection, in particular to a down-flow type peculiar smell purification system for a pot-type calcining furnace. Comprising a down-flow pot-type calcining furnace, the air outlet end of the down-flow pot-type calcining furnace is connected with a dust remover, and the dust remover is connected with an exhaust chimney through an exhaust pipe; a gate valve is arranged on the exhaust pipe; an induced draft fan is arranged on the exhaust pipe between the gate valve and the dust remover; the lower end of the gate valve is connected with a drainage pipeline; the drainage pipeline is connected with a return flue gas conveying pipeline; and the return flue gas conveying pipeline is connected with an air door of the downstream pot-type calcining furnace through a branch pipeline. A down-flow pot-type calcining furnace peculiar smell purification system is the earliest attempt in the same industry of carbon; the harm of poisonous and harmful gases such as sulfur dioxide, sulfur trioxide, nitrogen oxide, dust, carbon monoxide and carbon dioxide in the flue gas of the dust remover of the calcining furnace to post staff is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, specifically a downstream pot-type calcining furnace odor purification system, which solves the environmental problems caused by the volatilization of carbon monoxide, carbon dioxide, hydrogen sulfide, nitrogen oxides and other toxic and harmful gases with strong odors generated in the production process of the calcining furnace around the calcining furnace to the on-site equipment and facilities and the safety problems that easily cause poisoning and suffocation of operators; it can be applied to the dust removal and odor control in the production process of the calcining furnace in the carbon industry. Background Art

[0002] Before the technical transformation, the dust removal flue gas in the production process of the calcining furnace was discharged into the atmosphere through a centrifugal fan. Toxic and harmful gases such as sulfur dioxide, sulfur trioxide, carbon monoxide, carbon dioxide, dust, and nitrogen oxides in the flue gas posed occupational hazards to the workers in the calcining position, and also had an impact on the environment. The environmental risk was high, and the surrounding people often reported and complained, resulting in the use of low-sulfur coke for production, which had extremely high operating costs. Through the decomposition of 240 groups of preheating air ducts in 4 furnaces, the reuse and treatment of all dust removal flue gas was achieved, the environmental problems caused by dust collector flue gas were solved, and the hazards of toxic and harmful flue gas exposure to post operators were avoided; at the same time, after the low-level air distribution of the calcining furnace, it played a key role in cooling the low plate (iron plate) of the calcining furnace. The degree of oxidation and deterioration of the furnace and low plate after the transformation was much lower than that of the furnace and low plate without transformation. At the same time, the problem of hydrogen sulfide odor in the tail gas of the calcining furnace was solved, and the incidents of complaints and reports from the surrounding people were avoided, which made a great contribution to reducing the production and operation costs. This measure is the only successful case in the domestic carbon industry to control flue gas through re-combustion. Utility Model Content

[0003] In order to solve some problems existing in the calcining furnace in the prior art, the utility model provides an odor purification system for a downstream pot-type calcining furnace.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a downstream pot-type calcining furnace odor purification system, comprising a downstream pot-type calcining furnace, the gas outlet end of the downstream pot-type calcining furnace is connected to a dust collector, and the dust collector is connected to an external exhaust chimney through an exhaust pipe;

[0005] The exhaust pipe is provided with a gate valve; the exhaust pipe between the gate valve and the dust collector is provided with an induced draft fan;

[0006] The lower end of the plug valve is connected to the drainage pipeline;

[0007] The drainage pipe is connected to the return smoke delivery pipeline;

[0008] The return flue gas delivery pipeline is connected to the air door of the downstream pot calcining furnace through a branch pipeline.

[0009] Furthermore, a preheated air duct is provided at the lower end of the downflow pot type calciner, and an air door is provided at the lower end of the preheated air duct.

[0010] Furthermore, a regulating valve is provided on the branch pipeline.

[0011] Furthermore, the re-circulated flue gas delivery pipeline gradually tapers from the direction of the diversion pipeline along the gas flow direction.

[0012] Advantages of the present utility model:

[0013] The odor purification system for the downflow pot type calciner is the earliest attempt in the carbon industry; it solves the harm of toxic and harmful gases such as sulfur dioxide, sulfur trioxide, nitrogen oxides, dust, carbon monoxide, and carbon dioxide in the flue gas of the calciner dust collector to the post employees; reduces the environmental protection risk, and the re-circulated preheated flue gas will slow down the oxidation and corrosion rate of the calciner bottom plate, greatly extending the service life of the calciner. After application and comparison with the equipment that has not been implemented, the service life of a single pot of the calciner can be effectively extended by 12 - 16 months; at the same time, it digests the odor containing hydrogen sulfide discharged into the atmosphere, completely solving the problem reported by the surrounding people. During production operation, the sulfur content in the mixed petroleum coke can be increased from the original 1.8% to about 3.2% after the technical transformation. The high-sulfur coke blending ratio per ton of mixed petroleum coke can be increased by 1.4%, greatly reducing the cost of production raw material consumption. Calculated according to the current market price, the price difference between high-sulfur coke and low-sulfur coke is 1500 yuan. For every 1% increase in the high-sulfur coke addition amount in the mixed petroleum coke, the unit operation cost will be reduced by 15 yuan. The daily consumption of the calcination department is 1000t of petroleum coke, and the annual production operation cost can be reduced by 7,665,000 yuan (1.4 * 15 * 1000 * 365 = 7,665,000 yuan). Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the odor purification system for the downflow pot type calciner provided by the present utility model;

[0015] Among them: downflow pot type calciner 1, preheated air duct 101, air door 102, exhaust chimney 2, dust collector 3, induced draft fan 4, diversion pipeline 5, plug valve 6, re-circulated flue gas delivery pipeline 7, regulating valve 8, exhaust pipe 9, branch pipeline 10. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] As Figure 1 shown, this embodiment provides an odor purification system for a downflow pot type calciner, which includes a downflow pot type calciner 1. The gas outlet end of the downflow pot type calciner 1 is connected to a dust collector 3, and the dust collector 3 is connected to an external exhaust chimney 2 through an exhaust pipe 9;

[0018] An insertion plate valve 6 is installed at the position of the exhaust pipe 9 close to the external exhaust chimney 2. An induced draft fan 4 is provided on the exhaust pipe 9 between the insertion plate valve 6 and the dust collector 3. The direct-through chimney is changed to a three-way smoke exhaust mode, and the main control of the flue gas distribution is on the insertion plate valve 6. The lower end of the insertion plate valve 6 is connected to a diversion pipeline 5; the diversion pipeline 5 is connected to a return gas transmission pipeline 7; the return gas transmission pipeline 7 is connected to the air door 102 of the downflow pot type calciner 1 through a branch pipeline 10. As the flue gas treatment capacity of the calciner increases, the insertion plate valve is fully closed in the direct discharge to the sky mode, and the flue gas is returned to the calciner through the bottom air distribution port of the new flue for secondary combustion, and then discharged to the atmosphere after being desulfurized by the limestone wet desulfurization tower, completing the environmental protection treatment of the odor flue gas. The opening degree of the branch valve is based on the temperature of the calciner flue. After adjustment, it can be continuously used, and the valve opening degree does not need to be adjusted frequently.

[0019] In another embodiment of the present application, a preheated air duct 101 is provided at the lower end of the downflow pot type calciner 1, and an air door 102 is provided at the lower end of the preheated air duct 101.

[0020] In another embodiment of the present application, a regulating valve 8 is provided on the branch pipeline 10.

[0021] In another embodiment of the present application, the return gas transmission pipeline 7 gradually becomes thinner along the gas flow direction from the direction of the diversion pipeline 5.

[0022] An insertion plate valve 6 and a diversion pipeline 5 are installed on the exhaust pipe 9 of the downflow pot type calciner. The insertion plate design can flexibly adjust the flue gas volume. During use, the external discharge of the insertion plate is fully closed. The return gas transmission pipeline 7 is fabricated and welded using a steel plate drum process. The pipelines are welded and installed in sequence from thick to thin, aligned with the external air door of each calciner, and the branch pipeline is fabricated and welded. A bilateral flange fabrication design is adopted, and a branch manual control regulating valve 8 is installed. The opening degree of the gate valve is flexibly adjusted according to the process. The flue gas passes through the preheated air duct and is distributed into the calciner after being adjusted in combination with the calciner temperature process, and the sulfur dioxide, sulfur trioxide, carbon monoxide, carbon dioxide, dust, nitrogen oxides, etc. in the flue gas are decomposed by secondary combustion.

[0023] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A downstream pot calciner odor purification system, characterized by: It comprises a downstream pot-type calcining furnace (1), wherein the gas outlet end of the downstream pot-type calcining furnace (1) is connected to a dust collector (3), and the dust collector (3) is connected to an external exhaust chimney (2) through an exhaust pipe (9); The exhaust pipe (9) is provided with a gate valve (6); the exhaust pipe (9) between the gate valve (6) and the dust collector (3) is provided with an induced draft fan (4) The lower end of the gate valve (6) is connected to the drainage pipe (5); The drainage pipe (5) is connected to the return smoke delivery pipeline (7); The return flue gas delivery pipeline (7) is connected to the air door (102) of the downstream pot calcining furnace (1) via a branch pipeline (10).

2. The downstream pot calciner odor purification system according to claim 1 is characterized by: A preheating air duct (101) is provided at the lower end of the downstream pot calcining furnace (1), and an air door (102) is provided at the lower end of the preheating air duct (101).

3. The downstream pot calciner odor purification system according to claim 1 is characterized by: The branch pipeline (10) is provided with a regulating valve (8).

4. The downstream pot calciner odor purification system according to claim 1, characterized in that: The return smoke delivery pipeline (7) gradually tapers from the drainage pipe (5) along the gas flow direction.

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