A water sealing device for lower slag opening and annular space of a water-cooled wall gasifier

Abstract

The present invention provides a water seal device for the lower slag outlet and annular space of a water-cooled wall gasifier, characterized in that it comprises an outer water storage cylinder and an inner water storage cylinder whose bottom is sealed and welded to a gasifier partition plate, an annular water reservoir with an opening at the top is formed between the outer water storage cylinder and the inner water storage cylinder, and the water reservoir is connected to a water inlet pipeline and a water outlet pipeline; it also comprises a water channel separation cylinder coaxially arranged with the lower slag outlet of the gasifier; the bottom opening of the water channel separation cylinder is inserted into the water reservoir, and the space in the water reservoir is divided into two interconnected cavities by the cylinder wall of the water channel separation cylinder, thereby forming a water seal structure. The present invention realizes the effective sealing of the lower slag outlet and the annular space of a downward quenched water-cooled wall gasifier by constructing a water seal channel, liquid level monitoring, flow regulation, and spring sheet sealing. The present invention has a simple structure, is easy to implement, and has a high engineering application value.

Description

Technical Field

[0001] The invention relates to a device for sealing a lower slag opening and an annular space of a descending quenching water-cooled wall gasifier. Background Art

[0002] Coal gasification technology is one of the key technologies for clean and efficient utilization of coal resources. In recent years, with the growth of energy demand and the improvement of environmental protection requirements, coal gasification technology has developed in the direction of high gasification temperature, high carbon conversion rate, and wide adaptability of coal types, and the requirements for coal gasification devices, especially the core device - gasifier, have also been continuously improved.

[0003] The combustion furnace of the water-cooled wall gasifier adopts a water-cooled wall structure instead of the traditional stacked refractory brick structure, which can withstand higher gasification temperatures, improve gasification efficiency, and adapt to more types of coal, especially solving the gasification problem of high ash melting point coal. At the same time, the higher reliability of the water-cooled wall structure can ensure the long-term operation of the gasifier, reduce the cost of parking for maintenance and replacement of refractory bricks, and make the gasifier large-scale. Therefore, the cold wall gasifier has gradually replaced the traditional refractory brick gasifier and become the mainstream product in the coal gasification market.

[0004] The sealing of the lower slag outlet and the annular space of the water-cooled wall gasifier is one of the key and difficult points in the design of the downward water-quenched gasifier, which requires comprehensive consideration of sealing reliability, installation and maintenance space, thermal expansion of the gasifier, life, cost and other factors. The sealing structures commonly used in the gasifiers currently put into engineering application include expansion joint welding seals, flange connection seals, packing seals, etc., each with its own advantages and disadvantages. The problem of gas leakage into the annular space still occurs from time to time during the actual operation of the gasifier. Summary of the invention

[0005] The purpose of the present invention is to realize the sealing of the lower slag opening and the annular space of a descending quenching water-cooled wall gasifier.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is to provide a water-sealing device for the lower slag opening and annular space of a water-cooled wall gasifier, characterized in that it comprises an outer water storage cylinder and an inner water storage cylinder whose bottom is sealed and welded to the gasifier partition plate, the outer water storage cylinder and the inner water storage cylinder are coaxially arranged with the lower slag opening of the gasifier, the inner water storage cylinder is located inside the outer water storage cylinder, and an annular water storage tank with an open top is formed between the outer water storage cylinder and the inner water storage cylinder, the water storage tank is connected with a water inlet pipeline, and external water supply is introduced into the water storage tank through the water inlet pipeline, and the water in the water storage tank is discharged to an external water circulation system through a water outlet pipeline connected with the water storage tank, or the water in the water storage tank overflows directly from the upper port of the inner water storage cylinder into the quenching space of the gasifier, and the water in the water storage tank circulates and maintains the water level of the water storage tank at a set height;

[0007] It also includes a water channel dividing tube coaxially arranged with the lower slag outlet of the gasifier, the bottom of the water channel dividing tube is open and the top surface is closed; the lower slag outlet of the gasifier passes through the top surface of the water channel dividing tube, and the lower slag outlet of the gasifier and the top surface of the water channel dividing tube are sealed and welded; the bottom opening of the water channel dividing tube is inserted into the water reservoir and is spaced a certain distance from the bottom surface of the water reservoir, and the space in the water reservoir is divided into two interconnected cavities by the tube wall of the water channel dividing tube, thereby forming a water seal structure, and the sealing between the lower slag outlet of the gasifier and the annular space is achieved by the water seal structure; the spring sealing sheet is welded to the outer wall of the water channel dividing tube, and is sealed after being deformed and pressed against the inner wall of the outer water reservoir tube.

[0008] Preferably, the water inlet pipeline is connected to the bottom of the water storage outer cylinder.

[0009] Preferably, a flow regulating valve is installed on the water inlet pipeline to ensure the water level in the water seal structure.

[0010] Preferably, a liquid level monitoring device is installed on the water outlet pipeline to monitor the water level in the water reservoir and feedback a signal to the flow regulating valve on the water inlet pipeline to ensure the water level in the water reservoir.

[0011] Preferably, the water outlet pipeline is connected to the top of the water storage outer cylinder and is located below the spring sealing sheet.

[0012] The present invention realizes effective sealing of the lower slag opening and the annular space of the downward quenching water-cooled wall gasifier by constructing a water seal channel, liquid level monitoring, flow regulation, and spring sheet sealing. The present invention has a simple structure, is easy to implement, and has a high engineering application value.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The water seal device provided by the present invention adopts the water channel sealing principle, and is provided with liquid level monitoring and flow regulation at the same time. It is more reliable than expansion joint seal or packing seal, and has a natural advantage in lifespan.

[0015] 2. The water seal device provided by the present invention has a simple structure, and the inlet and outlet water channels can be connected to the water circulation system of the water-cooled wall of the gasifier. The cost is lower than that of the expansion joint seal and the packing seal.

[0016] 3. The parts of the water seal device provided by the present invention can be installed before the water-cooled wall internals and the outer shell of the gasifier are assembled. When assembling the gasifier, the corresponding matching dimensions can be adjusted, and there is no assembly space problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0019] like Figure 1 As shown, a water seal device for the lower slag outlet and annular space of a water-cooled wall gasifier provided by the present invention includes a group of water inlet pipelines 1, a group of water storage outer cylinders 2, a group of water storage inner cylinders 3, a group of water channel dividing cylinders 4, a group of spring sealing sheets 5, a group of water outlet pipelines 6, etc.

[0020] The water inlet pipeline 1 is connected to the bottom of the water storage outer cylinder 2 from the outside to supply water to the water seal. A flow regulating valve is installed on the water inlet pipeline 1 to ensure the water level in the water seal.

[0021] The bottom of the water storage outer cylinder 2 is sealed and welded to the gasification furnace partition plate 7 .

[0022] The bottom of the water storage inner cylinder 3 is sealed and welded to the gasification furnace partition plate 7, and forms a water storage tank with the water storage outer cylinder 2.

[0023] The upper part of the water channel dividing tube 4 is sealed and welded to the lower slag outlet 8 of the gasifier, and the lower part is inserted into the water reservoir between the water storage outer tube 2 and the water storage inner tube 3 to form a water seal channel from the lower slag outlet 8 to the annular space 9. The lower part of the water channel dividing tube 4 maintains a certain distance from the bottom of the water reservoir to absorb the thermal displacement generated when the operating temperature of the gasifier changes.

[0024] The spring sealing sheet 5 is welded to the outer wall of the water channel dividing cylinder 4 and is sealed after being deformed and pressed against the inner wall of the water storage outer cylinder 2 to prevent water or water vapor from flowing back into the annular space 9.

[0025] The water outlet pipe 6 is connected from the upper part of the water storage outer cylinder 2 to the external water circulation system. The water outlet pipe 6 is equipped with a liquid level monitoring device to monitor the water level in the water reservoir and feedback the signal to the flow regulating valve on the water inlet pipe 1 to ensure the water level in the water reservoir.

[0026] During installation, the water inlet pipe 1 is connected to the bottom of the water storage outer cylinder 2 from the external water supply, the lower ends of the water storage outer cylinder 2 and the water storage inner cylinder 3 are welded to the gasifier partition plate 7, the upper end of the water channel partition cylinder 4 is welded to the lower slag outlet 8 of the gasifier, the spring sealing sheet 5 is welded to the outer wall of the water channel partition cylinder 4, and the water outlet pipe 6 is connected from the upper part of the water storage outer cylinder 2 to the external water circulation system. When installing the gasifier water-cooled wall internals, adjust the relative positions of the water channel partition cylinder 4 and the water storage outer cylinder 2, the water storage inner cylinder 3, and the gasifier partition plate 7 so that the spring sealing sheet 5 is pressed against the outer wall of the water storage outer cylinder 2. A flow regulating device is installed on the water inlet pipe 1, and a liquid level monitoring device is installed on the water outlet pipe 6.

[0027] When the gasifier is in operation, the water in the water seal is kept circulating and the water level is maintained at a set height to achieve sealing of the water channel between the slag outlet and the annular space 9. When the water level exceeds the set height range, the liquid level monitoring device on the water outlet pipeline 6 feeds back a signal to the flow regulating device on the water inlet pipeline 1 to adjust the water inlet flow so that the water level in the water seal returns to the set height to ensure reliable sealing.

[0028] As another optional solution: replace the water outlet pipe structure with an overflow water outlet structure, cancel the above-mentioned water outlet pipeline 6, make the upper port of the water storage inner cylinder 3 lower than the upper port of the water storage outer cylinder 2, and the water in the water seal overflows directly from the upper port of the water storage inner cylinder to the quenching space of the gasifier. This solution sets the water inlet flow rate so that the water seal is always in an overflow state to ensure reliable sealing.

Claims

1. A water seal device for the lower slag outlet and annular space of a water-cooled wall gasifier, characterized in that: It comprises a water storage outer cylinder (2) and a water storage inner cylinder (3) whose bottom is sealed and welded to a gasifier partition plate (7); the water storage outer cylinder (2) and the water storage inner cylinder (3) are coaxially arranged with a lower slag outlet (8) of the gasifier; the water storage inner cylinder (3) is located inside the water storage outer cylinder (2); a ring-shaped water storage tank with an open top is formed between the water storage outer cylinder (2) and the water storage inner cylinder (3); the water storage tank is connected to a water inlet pipeline (1); external water is introduced into the water storage tank via the water inlet pipeline (1); the water in the water storage tank is discharged to an external water circulation system via a water outlet pipeline (6) connected to the water storage tank; or the water in the water storage tank overflows directly from the upper port of the water storage inner cylinder (3) into the quenching space of the gasifier; the water in the water storage tank circulates and maintains the water level of the water storage tank at a set height; It also includes a water channel separation cylinder (4) coaxially arranged with the lower slag opening (8) of the gasifier, the bottom of the water channel separation cylinder (4) being open and the top surface being closed; the lower slag opening (8) of the gasifier passes through the top surface of the water channel separation cylinder (4), and the lower slag opening (8) of the gasifier and the top surface of the water channel separation cylinder (4) are sealed and welded; the bottom opening of the water channel separation cylinder (4) is inserted into the water reservoir and is spaced a certain distance from the bottom surface of the water reservoir, and the space in the water reservoir is divided into two interconnected cavities by the cylinder wall of the water channel separation cylinder (4), thereby forming a water seal structure, and the sealing between the lower slag opening (8) of the gasifier and the annular space (9) is achieved by the water seal structure; the spring sealing sheet (5) is welded to the outer wall of the water channel separation cylinder (4), and is sealed after being deformed and pressed against the inner wall of the water reservoir outer cylinder (2); The water inlet pipeline (1) is provided with a flow regulating valve to ensure the water level in the water seal structure; the water outlet pipeline (6) is provided with a liquid level monitoring device for monitoring the water level in the water reservoir and feeding back a signal to the flow regulating valve on the water inlet pipeline (1) to ensure the water level in the water reservoir.

2. The water seal device for the lower slag opening and annular space of a water-cooled wall gasifier according to claim 1, characterized in that: The water inlet pipeline (1) is connected to the bottom of the water storage outer cylinder (2).

3. The water seal device for the lower slag opening and annular space of a water-cooled wall gasifier according to claim 1, characterized in that: The water outlet pipeline (6) is connected to the top of the water storage outer cylinder (2) and is located below the spring sealing sheet (5).

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