Dry quenching cycle gas waste heat recovery system with adjustable bypass flue

Abstract

This utility model discloses a dry quenching coke oven circulating gas waste heat recovery and utilization system with an adjustable bypass flue. It includes a dry quenching coke oven, a primary dust collector, a waste heat boiler, a secondary dust collector, and a flue gas bypass damper. The circulating gas outlet of the dry quenching coke oven is divided into two paths: one connected to the primary dust collector and the other connected to the flue gas bypass damper. The outlets of the primary dust collector and the flue gas bypass damper converge at the inlet of the waste heat boiler. The outlet of the waste heat boiler is connected to the secondary dust collector, and the outlet of the secondary dust collector is connected to the inlet of the dry quenching coke oven. This utility model adds an adjustable bypass flue at the outlet of the dry quenching coke oven and uses the flue gas bypass damper to reasonably adjust the particle size distribution of coke powder in the circulating gas. After the circulating gas enters the waste heat boiler, the wide-screened coke powder in the circulating gas impacts the heat exchange tubes of the waste heat boiler. The slight vibration of the heat exchange tubes reduces the coke powder adsorbed on the tube walls, effectively improving the boiler's thermal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of dry quenching technology, and in particular to a dry quenching circulating gas waste heat recovery and utilization system with an adjustable bypass flue. Background Technology

[0002] Currently, dry quenching technology is widely used because it can recover and utilize the sensible heat of red-hot coke, improve coke quality, and reduce environmental pollution from the quenching process. A dry quenching system mainly includes the following components: a dry quenching furnace, a primary dust collector, a dry quenching boiler, a secondary dust collector, a blower, and a boiler feedwater preheater. The principle of the dry quenching process is as follows: Inert circulating gas exchanges heat with the high-temperature coke, transferring the recovered heat to the waste heat boiler. Through indirect heat exchange, water is heated to generate saturated steam, which is then used to drive a turbine to generate electricity, thus achieving the recovery and utilization of the waste heat from the red-hot coke.

[0003] To reduce the wear of coke dust in the circulating gas on the dry quenching waste heat boiler, a cyclone separator is often used as a primary dust collector. The working principle of the cyclone separator is to use the centrifugal force generated by the rotating dust-laden gas to separate the coke dust particles from the airflow. The coke dust particles then adhere tightly to the inner surface of the cyclone separator and spiral downwards with the airflow, eventually being discharged into the dry quenching waste heat boiler through the coke dust discharge port at the bottom of the cyclone separator. However, the coke dust particles become smaller after passing through the cyclone separator. Due to electrostatic effects, these particles in the circulating gas after passing through the dry quenching waste heat boiler adhere to the heat exchange tubes of the boiler, making them difficult to remove and affecting the overall heat exchange efficiency of the waste heat boiler.

[0004] Therefore, developing a dry quenching system to reduce or eliminate coke powder particles adhering to the heat exchange tubes of the waste heat boiler and improve the heat exchange efficiency of the dry quenching waste heat boiler is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model designs a dry quenching circulating gas waste heat recovery and utilization system with an adjustable bypass flue.

[0006] The present invention adopts the following technical solution: A dry quenching coke oven circulating gas waste heat recovery and utilization system with an adjustable bypass flue includes a dry quenching coke oven, a primary dust collector, a waste heat boiler, a secondary dust collector, and a flue gas bypass damper. The circulating gas outlet of the dry quenching coke oven is divided into two paths, one of which is connected to the primary dust collector and the other is connected to the flue gas bypass damper. The outlet of the primary dust collector and the outlet of the flue gas bypass damper converge at the inlet of the waste heat boiler. The outlet of the waste heat boiler is connected to the secondary dust collector, and the outlet of the secondary dust collector is connected to the inlet of the dry quenching coke oven.

[0007] Furthermore, it also includes a secondary economizer, the inlet of which is connected to the outlet of the secondary dust collector, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven.

[0008] Furthermore, it also includes a circulating fan, the inlet of which is connected to the outlet of the secondary dust collector, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven.

[0009] Furthermore, the primary dust collector is a cyclone separator.

[0010] The beneficial effects of this utility model are as follows: This utility model adds an adjustable bypass flue at the outlet of the dry quenching coke oven, and uses a flue gas bypass baffle to reasonably adjust the particle size distribution of coke powder in the circulating gas. After the circulating gas enters the waste heat boiler, the coke powder with a wide sieve particle size in the circulating gas impacts the heat exchange tubes of the waste heat boiler. The slight vibration of the heat exchange tubes can reduce the coke powder adsorbed on the tube wall, which can effectively improve the boiler thermal efficiency. Attached Figure Description

[0011] Figure 1 This is a flowchart illustrating the structure of this utility model; In the diagram: 10. Dry quenching coke oven; 20. Primary dust collector; 30. Waste heat boiler; 40. Secondary dust collector; 50. Circulating fan; 60. Subsidiary economizer; 70. Flue gas bypass damper. Detailed Implementation

[0012] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example: Figure 1 As shown, a flue gas waste heat recovery and utilization system with an adjustable bypass flue includes a dry quenching coke oven 10, a primary dust collector 20, a waste heat boiler 30, a secondary dust collector 40, and a flue gas bypass damper 70.

[0013] The flue gas outlet of the dry quenching coke oven 10 is divided into two paths. One path is connected to the flue gas inlet of the primary dust collector 20, and the other path is connected to the flue gas bypass damper 70. After the flue gas outlets of the primary dust collector 20 and the flue gas bypass damper 70 are combined, they are connected to the flue gas inlet of the waste heat boiler 30.

[0014] During operation, the quenching process in the dry quenching coke oven 10 results in the circulating gas carrying a large amount of coke powder. This circulating gas is split into two streams at the flue gas outlet of the dry quenching coke oven 10. One stream enters the primary dust collector 20, where the coke powder is separated, and the circulating gas carrying small coke particles is discharged at the outlet of the primary dust collector. The other stream of circulating gas passes through the flue gas bypass damper 70. By adjusting the opening of the flue gas bypass damper 70, a certain amount of circulating gas carrying wide-screen coke powder is discharged at the outlet of the flue gas bypass damper 70. These two streams of circulating gas then merge and enter the waste heat boiler 30. When circulating gas is introduced into the waste heat boiler 30, small coke particles are easily adsorbed onto the surface of the heat exchange tubes of the waste heat boiler 30 due to electrostatic effects. The wide-sieve coke particles can collide with the heat exchange tubes of the waste heat boiler 30. The slight vibration of the heat exchange tubes can cause the small coke particles adsorbed on the heat exchange tubes to fall off, thereby preventing the small coke particles from affecting the heat exchange efficiency of the waste heat boiler 30.

[0015] In one embodiment, a secondary dust collector 40 is also included, the inlet of which is connected to the flue gas outlet of the waste heat boiler 30, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven 10.

[0016] The secondary dust collector 40 can remove wide-screened and small-particle coke powder discharged from the flue gas outlet of the waste heat boiler 30, further improving the stability of the system during operation.

[0017] In one embodiment, the system further includes a circulating fan 50, the inlet of which is connected to the outlet of the secondary dust collector 40, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven 10, in order to improve the operating efficiency of the system.

[0018] In one embodiment, a secondary economizer 60 is also included. The inlet of the secondary economizer 60 is connected to the outlet of the secondary dust collector 40, and the outlet of the secondary economizer 60 is connected to the flue gas inlet of the dry quenching coke oven 10. The secondary economizer 60 can further utilize the heat in the flue gas discharged from the flue gas outlet of the waste heat boiler 30, thereby improving the utilization rate of waste heat from the flue gas.

[0019] This invention adds a bypass flue at the outlet of a dry quenching coke oven. The particle size of the coke powder entering the waste heat boiler can be adjusted by the flue gas damper. Larger coke powder particles can impact the heat exchange tubes, and the slight vibration of the heat exchange tubes can reduce the adhesion of coke powder to the tube walls, thereby effectively improving the boiler's thermal efficiency.

[0020] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A dry quenching coke oven circulating gas waste heat recovery and utilization system with an adjustable bypass flue, comprising a dry quenching coke oven, a primary dust collector, a waste heat boiler, and a secondary dust collector, characterized in that, It also includes a flue gas bypass damper. The circulating gas outlet of the dry quenching coke oven is divided into two paths, one of which is connected to the primary dust collector and the other is connected to the flue gas bypass damper. The outlet of the primary dust collector and the outlet of the flue gas bypass damper converge at the inlet of the waste heat boiler. The outlet of the waste heat boiler is connected to the secondary dust collector, and the outlet of the secondary dust collector is connected to the inlet of the dry quenching coke oven.

2. The dry quenching circulating gas waste heat recovery and utilization system with an adjustable bypass flue as described in claim 1, characterized in that, It also includes a secondary economizer, the inlet of which is connected to the outlet of the secondary dust collector, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven.

3. The dry quenching circulating gas waste heat recovery and utilization system with an adjustable bypass flue as described in claim 1, characterized in that, It also includes a circulating fan, the inlet of which is connected to the outlet of the secondary dust collector, and the outlet of which is connected to the flue gas inlet of the dry quenching coke oven.

4. The dry quenching circulating gas waste heat recovery and utilization system with an adjustable bypass flue as described in claim 1, characterized in that, The primary dust collector is a cyclone separator.

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