Calcium carbide furnace tail gas purification system

Abstract

The invention discloses a tail gas purification system for tail gas treatment in the production process of a calcium carbide furnace, and belongs to the technical field of calcium carbide furnace production accessories, the purification system comprises a multi-stage sedimentation cooler, an alpha-type cyclone separator, a plurality of sets of bag-type dust removers, a purification system centrifugal fan, a gas purification chimney and purified ash conveying equipment. The multi-stage sedimentation cooler comprises three stages which are sequentially communicated and are connected with the alpha-type cyclone separator, the five sets of bag-type dust removers are sequentially communicated, and the multi-stage sedimentation cooler, the alpha-type cyclone separator and the bag-type dust removers are all directly connected with the purified ash conveying system. According to the tail gas purification system for the calcium carbide furnace, the conventional purification system form that the multi-stage sedimentation coolers are connected in series is modified, and the reverse blowers are arranged at the tops of the bag-type dust removers, so that the tail gas temperature of the calcium carbide furnace can be effectively reduced, dust sedimentation is facilitated, particles are prevented from depositing in the coolers to block equipment, and the service life of the equipment is prolonged. The tail gas cooling efficiency and the dust trapping efficiency are improved, and the number of carbon monoxide leakage times caused by too large pressure of a purification system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of calcium carbide furnace production, and in particular to an exhaust gas purification system used for exhaust gas treatment in the production process of calcium carbide furnace. Background Art

[0002] Calcium carbide is a basic chemical raw material. It uses abundant and cheap limestone and carbon materials as resources to produce low-cost calcium carbide, thereby meeting the demand for calcium carbide for products such as PVC. It is of great significance to extend the industrial chain, develop a circular economy, enhance market competitiveness, and enhance the ability of enterprises to resist risks. However, the calcium carbide furnace is a high-energy consumption and high-pollution equipment. During the production process, the calcium carbide furnace will produce a large amount of high-temperature dust-containing tail gas (flue gas). If these tail gases are not properly handled, they will affect the health of operators and pollute the environment if discharged into the atmosphere. The tail gas of the calcium carbide furnace contains a large amount of CO, which is also a usable energy medium. If the tail gas of the calcium carbide furnace is collected, purified and comprehensively utilized, it can meet environmental protection requirements and make full use of energy, while reducing the production cost of the enterprise and improving the economic benefits for the enterprise.

[0003] The dust concentration of calcium carbide furnace tail gas is about 100-150g / Nm 3 , up to 300g / Nm 3 If the tail gas of the calcium carbide furnace is to be used directly as energy, the particles in the dusty tail gas will be deposited in the pipeline and block the pipeline, affecting the normal production of the calcium carbide furnace. Therefore, it is necessary to purify the tail gas of the calcium carbide furnace.

[0004] The existing calcium carbide furnace purification system uses four-stage sedimentation tanks in series to settle the exhaust dust, and the exhaust dust subsequently enters five bag bins. The dust concentration in the flue gas of the calcium carbide exhaust purification system is as high as 75g / m3 (up to 150g / m3). Due to the low separation efficiency of the sedimentation cooler, the cooler is seriously dusty, clogging the equipment, and the cooler cannot work properly. The subsequent bag dust collector is overloaded for a long time, which is easy to clog the bag and increase the operating resistance of the system. When the blockage is serious, the bag dust collector will lose its separation function, and the equipment and pipelines will be blocked, which will cause the purification system equipment to fail and the system resistance to increase. There is a risk of carbon monoxide leakage leading to personnel poisoning and on-site fire and explosion.

[0005] Based on the above problems, it is urgent to develop and transform the purification system to stabilize the normal operation of the calcium carbide furnace and eliminate safety hazards on site. Summary of the invention

[0006] In view of the problems of low purification efficiency, easy pipeline blockage, and possible carbon monoxide leakage in the existing calcium carbide furnace purification system, the present invention provides a purification system for treating calcium carbide furnace exhaust.

[0007] In order to solve the technical problems existing in the above-mentioned existing purification systems, the technical solution of the present invention is: a calcium carbide furnace exhaust gas purification system, characterized in that it includes: a multi-stage sedimentation cooler, an α-type cyclone separator, multiple sets of bag dust collectors, a purification system centrifugal fan, a clean gas chimney and purified ash conveying equipment.

[0008] The multi-stage sedimentation cooler includes three stages, namely a primary sedimentation cooler, a secondary sedimentation cooler and a tertiary sedimentation cooler. The primary sedimentation cooler, the secondary sedimentation cooler and the tertiary sedimentation cooler are connected in sequence from left to right. The tertiary sedimentation cooler is connected to an α-type cyclone separator. The primary sedimentation cooler, the secondary sedimentation cooler, the tertiary sedimentation cooler and the α-type cyclone separator are all directly connected to a purified ash conveying system.

[0009] The multiple sets of bag dust collectors include five sets, namely bag dust collector No. 1, bag dust collector No. 2, bag dust collector No. 3, bag dust collector No. 4 and bag dust collector No. 5. The bag dust collector No. 1, bag dust collector No. 2, bag dust collector No. 3, bag dust collector No. 4 and bag dust collector No. 5 are connected in sequence from left to right. The bag dust collector No. 1, bag dust collector No. 2, bag dust collector No. 3, bag dust collector No. 4 and bag dust collector No. 5 are in parallel. The bag dust collector No. 1, bag dust collector No. 2, bag dust collector No. 3, bag dust collector No. 4 and bag dust collector No. 5 are all directly connected to the purified ash conveying system.

[0010] The purification system includes a centrifugal fan, which includes a rough air fan, a clean air fan and a pressurized fan. The inlet and outlet of the centrifugal fan of the purification system are both expanded joints. The α-type cyclone separator is connected to the No. 1 bag dust collector through the rough air fan, and the multiple sets of bag dust collectors are connected to the clean air fan.

[0011] The purified ash conveying system mainly includes a scraper conveyor.

[0012] The inlet and outlet of the purification system pipeline are both equipped with expansion joints.

[0013] Furthermore, the first-stage sedimentation cooler is connected in series with the second-stage sedimentation cooler, the second-stage sedimentation cooler is connected in parallel with the third-stage sedimentation cooler, the third-stage sedimentation cooler is connected in series with the α-type cyclone separator, and the multi-stage sedimentation cooler and the α-type cyclone separator are connected to the rough air fan.

[0014] Furthermore, the tops of the multiple sets of bag dust collectors are all equipped with back-blowing fans, which are connected to the pressurized fan through a pipeline, and the inlet pipeline of the back-blowing fan is arranged behind the clean air chimney.

[0015] Furthermore, the multi-stage sedimentation cooler and the multiple sets of bag-type dust collector main bodies are both equipped with rapping motors and air hammers, and the rapping motors and air hammers are fixed by welding.

[0016] Furthermore, star-shaped ash discharge valves are provided below the multi-stage sedimentation cooler and the multiple sets of bag dust collectors, and the star-shaped ash discharge valves are connected to the scraper conveyor.

[0017] Beneficial effects of the invention: The invention provides a calcium carbide furnace purification system, which includes a multi-stage sedimentation cooler, an α-type cyclone separator, multiple sets of bag dust collectors and purified ash conveying equipment. The multi-stage sedimentation cooler is connected to the α-type cyclone separator, the α-type cyclone separator is connected through multiple sets of bag dust collectors, and the multi-stage sedimentation cooler and the multiple sets of bag dust collectors are directly connected to the purified ash conveying equipment. The multi-stage sedimentation cooler includes a primary sedimentation cooler, a secondary sedimentation cooler and a tertiary sedimentation cooler. The primary sedimentation cooler and the secondary sedimentation cooler are connected in series, the secondary sedimentation cooler and the tertiary sedimentation cooler are connected in parallel, and the tertiary sedimentation cooler and the α-type cyclone separator are connected in series. By modifying the purification system form of the conventional multi-stage sedimentation cooler connected in series, the secondary sedimentation cooler and the tertiary sedimentation cooler can reduce the axial gas velocity of the gas in the sedimentation cooler after being connected in parallel. Due to the reduction in gas velocity, the speed difference between the terminal velocity of the particles and the airflow is reduced, the force on the dust is reduced, which is conducive to dust sedimentation. At the same time, it can effectively reduce the exhaust temperature of the calcium carbide furnace, avoid particles from depositing in the cooler to block the equipment, and improve the efficiency of exhaust gas cooling and dust capture. Multiple sets of bag dust collectors are equipped with back-blowing blowers on the top, which are connected to the pressurized blower through pipes, which can enhance the back-blowing effect of dust accumulation inside the multiple sets of bag dust collectors, effectively avoid dust accumulation blockage in the bag dust collectors, and reduce the number of carbon monoxide leaks caused by excessive pressure in the purification system. The multi-stage sedimentation cooler and the main body of multiple sets of bag dust collectors are equipped with vibration motors and air hammers. The time interval of the vibration motor and air hammer can be adjusted according to the dust discharge situation of the purification system, which can effectively ensure smooth dust discharge and prevent the purification system from being blocked when the ambient temperature fluctuates greatly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of a calcium carbide furnace tail gas purification system of the present invention;

[0020] In the figure: 1 is a primary sedimentation cooler, 2 is a secondary sedimentation cooler, 3 is a tertiary sedimentation cooler, 4 is an α-type cyclone separator, 5 is a No. 1 bag dust collector, 6 is a No. 2 bag dust collector, 7 is a No. 3 bag dust collector, 8 is a No. 4 bag dust collector, 9 is a No. 5 bag dust collector, 10 is an electric butterfly valve, 11 is a rough air fan, 12 is a pressure fan, 13 is a clean air fan, 14 is a vibration motor, 15 is an air hammer, 16 is an expansion joint, 17 is a scraper conveyor, 18 is a back blower, 19 is a star-shaped ash discharge valve, and 20 is a clean air chimney. DETAILED DESCRIPTION

[0021] like Figure 1As shown, a calcium carbide furnace tail gas purification system of the present invention includes a multi-stage sedimentation cooler, an α-type cyclone separator 4, multiple sets of bag dust collectors, a purification system centrifugal fan, a clean gas chimney 20 and a purified ash conveying device. The multi-stage sedimentation cooler includes a primary sedimentation cooler 1, a secondary sedimentation cooler 2 and a tertiary sedimentation cooler 3. The calcium carbide furnace tail gas enters the multi-stage sedimentation cooler through a pipeline. The primary sedimentation cooler 1, the secondary sedimentation cooler 2 and the tertiary sedimentation cooler 3 are sequentially connected with the α-type cyclone separator 4 from left to right. The dust captured by the sedimentator and the α-type cyclone separator 4 enters the scraper conveyor 17 through a star-shaped ash discharge valve 19. The first-stage sedimentation cooler 1 and the second-stage sedimentation cooler 2 are connected in series, the second-stage sedimentation cooler 2 and the third-stage sedimentation cooler 3 are connected in parallel, the third-stage sedimentation cooler 3 and the α-type cyclone separator 4 are connected in series, and expansion joints 16 are installed on the pipeline connecting the first-stage settler 1 and the second-stage settler 2, the pipeline connecting the second-stage settler 2 and the third-stage settler 3, and the pipelines connecting the settlers at each level and the α-type cyclone separator 4 and the scraper conveyor 17. The gas outlet pipeline of the α-type cyclone separator 4 is connected to the rough air fan 11, and the gas inlet and outlet of the rough air fan 11 are all provided with expansion joints 16. The gas outlet pipe of the rough air fan 11 is connected to the inlet of the No. 1 bag dust collector 5. The No. 1 bag dust collector 5, the No. 2 bag dust collector 6, the No. 3 bag dust collector 7, the No. 4 bag dust collector 8 and the No. 5 bag dust collector 9 are connected in parallel from left to right. The dust captured by the No. 1 bag dust collector 5, the No. 2 bag dust collector 6, the No. 3 bag dust collector 7, the No. 4 bag dust collector 8 and the No. 5 bag dust collector 9 enters the scraper conveyor 17 through the star-shaped ash discharge valve 19. Expansion joints 16 are installed on the pipes connecting the No. 1 bag dust collector 5, the No. 2 bag dust collector 6, the No. 3 bag dust collector 7, the No. 4 bag dust collector 8 and the No. 5 bag dust collector 9 with the scraper conveyor 17. The gas outlet pipe at the top of the bag filter is connected to the clean air fan 13, and the gas inlet and outlet of the clean air fan 13 are both provided with expansion joints 16. A clean air chimney 20 is provided behind the gas outlet pipe of the clean air fan 13, and an electric butterfly valve 10 is installed at the inlet of the clean air chimney 20. A back-blowing pressurization pipe is provided behind the clean air chimney 20 pipe, which is connected to the inlet of the pressurization fan 12, and the outlet of the pressurization fan 12 is connected to the back-blowing blower 18, and the gas enters the bag filter through the back-blowing motor 18. Vibrating motors 14 and air hammers 15 are installed on the exterior of the multi-stage sedimentation cooler and the main bodies of the multiple sets of bag filters.

Claims

1. A calcium carbide furnace tail gas purification system, characterized in that: It comprises a multi-stage sedimentation cooler, an α-type cyclone separator (4), multiple sets of bag dust collectors, a purification system centrifugal fan, a clean gas chimney (20) and purified ash conveying equipment.

2. The calcium carbide furnace tail gas purification system according to claim 1 is characterized in that: The multi-stage sedimentation cooler comprises three stages, namely a primary sedimentation cooler (1), a secondary sedimentation cooler (2) and a tertiary sedimentation cooler (3); the primary sedimentation cooler (1), the secondary sedimentation cooler (2) and the tertiary sedimentation cooler (3) are sequentially connected from left to right; the tertiary sedimentation cooler (3) is connected to an α-type cyclone separator (4); the primary sedimentation cooler (1), the secondary sedimentation cooler (2), the tertiary sedimentation cooler (3) and the α-type cyclone separator (4) are all directly connected to a purified ash conveying system.

3. The calcium carbide furnace tail gas purification system according to claim 1 is characterized in that: The plurality of bag dust collectors include five sets, namely a No. 1 bag dust collector (5), a No. 2 bag dust collector (6), a No. 3 bag dust collector (7), a No. 4 bag dust collector (8) and a No. 5 bag dust collector (9). The No. 1 bag dust collector (5), the No. 2 bag dust collector (6), the No. 3 bag dust collector (7), the No. 4 bag dust collector (8) and the No. 5 bag dust collector (9) are sequentially connected from left to right. The No. 1 bag dust collector (5), the No. 2 bag dust collector (6), the No. 3 bag dust collector (7), the No. 4 bag dust collector (8) and the No. 5 bag dust collector (9) are connected in parallel. The No. 1 bag dust collector (5), the No. 2 bag dust collector (6), the No. 3 bag dust collector (7), the No. 4 bag dust collector (8) and the No. 5 bag dust collector (9) are all directly connected to the purified ash conveying system.

4. The calcium carbide furnace tail gas purification system according to claim 1 is characterized in that: The centrifugal fan of the purification system comprises a rough air fan (11), a clean air fan (12) and a pressurizing fan (13); the inlet and outlet of the centrifugal fan of the purification system are both provided with expansion joints (16); the α-type cyclone separator (4) is connected to the No. 1 bag dust collector (5) via the rough air fan (11); and the multiple sets of bag dust collectors are connected to the clean air fan (12).

5. The calcium carbide furnace tail gas purification system according to claim 2 is characterized in that: The multi-stage sedimentation cooler comprises: a first-stage sedimentation cooler (1) and a second-stage sedimentation cooler (2) are connected in series; the second-stage sedimentation cooler (2) and a third-stage sedimentation cooler (3) are connected in parallel; the third-stage sedimentation cooler (3) and an α-type cyclone separator (4) are connected in series; and the multi-stage sedimentation cooler and the α-type cyclone separator (4) are connected to a rough air fan (11).

6. The calcium carbide furnace tail gas purification system according to claim 3 is characterized in that: The tops of the multiple sets of bag dust collectors are all equipped with a back-blowing fan (18), which is connected to the pressurized fan (12) through a pipeline, and the inlet pipeline of the back-blowing fan (18) is arranged behind the clean gas chimney (20); Furthermore, the multi-stage sedimentation cooler and the multiple sets of bag-type dust collector main bodies are both equipped with rapping motors and air hammers, and the rapping motors and air hammers are fixed by welding.

7. The calcium carbide furnace tail gas purification system according to claim 2 is characterized in that: A star-shaped ash discharge valve (19) is provided below the multi-stage sedimentation cooler and the multiple sets of bag dust collectors, and the star-shaped ash discharge valve (19) is connected to the scraper conveyor (17). A vibration motor (14) and an air hammer (15) are installed on the main body of the multi-stage sedimentation cooler and the multiple sets of bag dust collectors.

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