Water seal sealing valve for outlet of high-temperature filter and opening and closing method

Abstract

The invention provides a water seal sealing valve for a high-temperature filter outlet and an opening and closing method, and relates to the technical field of high-temperature sealing, an air inlet of the water seal sealing valve faces upwards along the high-temperature filter outlet, and the water seal sealing valve comprises an air inlet pipe connected with a high-temperature filter outlet pipe and an outer cylinder arranged on the periphery of the air inlet pipe in a sleeving mode and connected with the air inlet pipe in a sealed mode; the outer cylinder and the air inlet pipe are matched with each other to form a water seal cavity, and a safety valve is arranged at an air outlet of the water seal sealing valve. The safety valve is a safety guarantee valve of the water seal sealing valve, and the safety valve provides a second safety protection guarantee after the water seal structure is arranged. The water-seal sealing valve can be used on a diffusing pipeline which needs to diffuse and does not meet the coal gas requirement, even if tar and other substances are adhered to the water-seal sealing valve, the attachments can be easily oxidized and removed when a high-temperature filter is regenerated, and the safety valve can provide safety guarantee; the technical problems that in the prior art, a sealing valve in a sealing valve system is large in size, the sealing capacity cannot meet the requirement, and potential safety hazards exist are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature sealing, and in particular to a water-sealed sealing valve for the outlet of a high-temperature filter and an opening and closing method thereof. Background Art

[0002] The temperature of pulverized coal pyrolysis is usually 400 - 650 °C. Since pulverized coal pyrolysis not only produces a large amount of raw gas, but also the raw gas contains a large amount of fine coal dust and coal tar. To separate the fine coal dust from the gas and coal tar in the raw gas, the raw gas must be filtered at high temperature first. Otherwise, coal tar will precipitate when the raw gas encounters a lower temperature environment, and the filter element will quickly lose its function. Therefore, when filtering the raw gas, it is necessary to ensure the temperature inside the filter first, and then filter and separate the fine coal dust. Since fine coal dust and coal tar are easily adhered to the surface of the filter element when the high-temperature filter element filters the raw gas, the air permeability of the filter element will drop significantly within 3 - 5 days. Therefore, the filter usually has at least one spare to meet the switching of the filter. A high-temperature sealing valve needs to be installed on the outlet pipe of the filter to meet the heating, filtering, and cyclic regeneration of the high-temperature filter.

[0003] In industrial pulverized coal pyrolysis, the gas volume is quite large. Therefore, the volume of the high-temperature sealing valve is also quite large. Through the research and development and use of various valves, the results are not ideal. Either the use cost is high, or the sealing does not meet the requirements, and there are great potential safety hazards.

[0004] For example, in the Chinese patent with the publication number CN103629381A, a liquid metal sealing valve for a gas pipeline in a high-temperature environment uses low-melting-point liquid metal and utilizes the liquid level difference inside and outside the sealing cover to seal. However, when the sealing cover rises or falls, at the moment of contacting the liquid surface, before the liquid level difference can play a sealing role, due to the existence of the internal and external pressure difference, a large amount of liquid metal splashes, which not only causes safety risks, but also results in a large loss of alloy and high operating costs; in the Chinese patent with the publication number CN109838564A, a double-sealed high-temperature sealing valve uses the elastic deformation between the valve core and the annular cone plate for sealing. However, in reality, due to the too large diameter of the valve (for example, the diameter is greater than 1000 mm), it cannot achieve the desired effect, and there is a phenomenon of insufficient sealing, which affects the safe operation.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a water-sealed sealing valve for the outlet of a high-temperature filter to solve at least one of the technical problems existing in the prior art.

[0007] Another purpose of the present invention is to provide an opening and closing method for the above-mentioned water-sealed sealing valve for the outlet of a high-temperature filter.

[0008] To achieve the above object of the present invention, the following technical solutions are specifically adopted:

[0009] In a first aspect, the present invention provides a water seal valve for the outlet of a high-temperature filter. The air inlet of the water seal valve is directed upward along the outlet of the high-temperature filter. The water seal valve includes an intake pipe connected to the outlet pipe of the high-temperature filter and an outer cylinder sleeved around the intake pipe and sealingly connected to the intake pipe. The outer cylinder and the intake pipe cooperate with each other to form a water seal cavity, and a safety valve is provided at the air outlet of the water seal valve.

[0010] Further, an outlet pipe communicating with the water seal cavity is provided at the lower part of the outer cylinder, and the safety valve is arranged on the outlet pipe.

[0011] Further, a drain pipe and a water inlet pipe communicating with the water seal cavity are provided on the outer cylinder, and the water inlet of the drain pipe is communicated with the bottom of the water seal cavity.

[0012] Further, a drain valve is provided on the drain pipe, and a water inlet valve is provided on the water inlet pipe.

[0013] Further, the horizontal height of the safety valve ≥ the horizontal height of the air outlet of the intake pipe.

[0014] Further, the horizontal height of the top of the outer cylinder > the horizontal height of the air outlet of the intake pipe.

[0015] Further, the bottom of the outer cylinder is sealingly connected to the intake pipe through an annular end plate, and the top end of the outer cylinder is sealingly connected to a top cover.

[0016] Further, the top cover is a conical structure with a larger bottom and a smaller top;

[0017] The safety valve is a high-temperature resistant blind plate valve.

[0018] In a second aspect, the present invention provides an opening and closing method for the above water seal valve, including:

[0019] When it is necessary to close the water seal valve, fill the water seal cavity with water and close the safety valve;

[0020] When it is necessary to open the water seal valve, drain the water in the water seal cavity and open the safety valve;

[0021] Further, filling the water seal cavity with water includes opening the water inlet valve and closing the drain valve;

[0022] Draining the water in the water seal cavity includes opening the drain valve and closing the water inlet valve.

[0023] A water seal valve for the outlet of a high-temperature filter provided by the present invention, and the safety valve is the safety guarantee valve of the water seal valve. During water sealing, the safety valve is also in a closed state. Regardless of whether the air pressure fluctuates, with the safety valve closed, the pipelines connected to both sides of the water seal valve cannot be connected, ensuring the safety and reliability of the seal. The safety valve provides a second layer of safety protection after the water seal structure to prevent the water seal from being punctured and ensure the smooth discharge of gas to the outside; when the high-temperature filter for filtering dusty raw coal gas operates, gas switching is required for preheating, filtering, and regeneration operations. This water seal valve can be used on the discharge pipeline that needs to discharge unqualified coal gas. Even if tar and other substances adhere to the water seal valve, it is easy to oxidize and remove the attachments during the regeneration of the high-temperature filter, and the safety valve can provide safety protection; compared with the high-temperature seal valve, the water seal valve system has high sealing safety and a small volume; compared with the liquid metal seal valve, the water seal valve has no sealing cover lifting structure when opening and closing, avoiding liquid splashing, and only requires circulating water. It can use the "ammonia water" separated from coal pyrolysis as circulating water, which is not only more conducive to the environmental temperature requirements, has a temperature of about 80 degrees, is particularly friendly to low-temperature regions, and is inexpensive. It solves the technical problems in the prior art that the seal valve in the seal valve system is large in volume, the sealing ability fails to meet the requirements, and there are potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of a water seal valve for the outlet of a high-temperature filter provided in Embodiment 1 of the present invention;

[0026] Figure 2 It is a schematic structural diagram of a water seal valve for the outlet of a high-temperature filter provided in Embodiment 2 of the present invention.

[0027] Reference numerals: 61 - intake pipe; 62 - outer cylinder; 63 - annular end plate; 64 - top cover; 65 - drain pipe; 651 - drain valve; 66 - water inlet pipe; 661 - water inlet valve; 67 - outlet pipe; 671 - safety valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] On the one hand, the present invention provides a water seal valve for a high-temperature filter outlet, wherein the air inlet of the water seal valve is directed upward along the high-temperature filter outlet, and the water seal valve comprises an air inlet pipe 61 and an outer cylinder 62 which is sleeved on the outer periphery of the air inlet pipe 61 and sealedly connected to the air inlet pipe 61, wherein the outer cylinder 62 cooperates with the air inlet pipe 61 to form a water seal cavity, and a safety valve 671 is provided at the air outlet of the water seal valve.

[0031] Safety valve 671 is a safety guarantee valve for the water seal valve. When the water seal is in effect, the safety valve 671 is also in a closed state. Regardless of whether the air pressure fluctuates, when the safety valve 671 is closed, the pipes connected on both sides of the water seal valve cannot be connected, ensuring the safety and reliability of the seal. The safety valve 671 provides a second safety protection after the water seal structure to prevent the water seal from breaking and ensure that the gas is discharged smoothly. The high-temperature filter that filters dusty waste gas is in operation. Because the preheating, filtering and regeneration operations require the switching of gas, the water seal sealing valve can be used for the release pipe that does not meet the gas requirements. Even if tar and other substances are bonded to the water seal sealing valve, it is easy to oxidize and remove the attachments when regenerating the high-temperature filter, and the safety valve can provide safety protection. Compared with the high-temperature sealing valve, the water seal sealing valve system has high sealing safety and small size. Compared with the liquid metal sealing valve, the water seal sealing valve has no sealing cover lifting structure when opening and closing, avoiding liquid splashing, and only requires circulating water. The "ammonia water" separated by coal pyrolysis can be used as circulating water, which is not only more conducive to the requirements of the ambient temperature, but also has a temperature of about 80 degrees, which is particularly friendly to low-temperature areas and is cheap. It solves the technical problems of large sealing valve volume, insufficient sealing capacity and potential safety hazards in the sealing valve system in the prior art.

[0032] The air inlet is directed upward, and the top of the air inlet pipe 61 also plays an overflow role. The overflowing water can also wash off the tar and dust adhered to the inner wall of the air inlet pipe 61.

[0033] In some specific embodiments, the safety valve 671 may employ a high-temperature resistant blind plate valve.

[0034] In some specific embodiments, the normal operating temperature range of the high-temperature filter is 400 - 650 °C.

[0035] In some specific embodiments, an air outlet pipe 67 communicating with the water seal cavity is provided at the lower part of the outer cylinder 62, and the safety valve 671 is disposed on the air outlet pipe 67.

[0036] In some specific embodiments, a water discharge pipe 65 and a water inlet pipe 66 communicating with the water seal cavity are provided on the outer cylinder 62, and the water inlet of the water discharge pipe 65 communicates with the bottom of the water seal cavity.

[0037] In some specific embodiments, the horizontal height of the safety valve 671 ≥ the horizontal height of the air outlet of the air inlet pipe 61.

[0038] In some specific embodiments, the horizontal height of the top of the outer cylinder 62 > the horizontal height of the air outlet of the air inlet pipe 61.

[0039] In some specific embodiments, a water discharge valve 651 is provided on the water discharge pipe 65, and a water inlet valve 661 is provided on the water inlet pipe 66.

[0040] Among them, the water discharge valve 651 and the water inlet valve 661 employ high-temperature resistant hard-sealed ball valves resistant to 500 °C.

[0041] In some specific embodiments, the bottom of the outer cylinder 62 is hermetically connected to the air inlet pipe 61 through an annular end plate 63, and the top end of the outer cylinder 62 is hermetically connected to the top cover 64.

[0042] The top cover 64 is a conical structure with a larger bottom and a smaller top.

[0043] According to another aspect of the present invention, there is also provided an opening and closing method for the above water seal valve, including the following steps:

[0044] When it is necessary to close the water seal valve, fill the water seal cavity with water and close the safety valve 671;

[0045] When it is necessary to open the water seal valve, drain the water in the water seal cavity and open the safety valve 671.

[0046] In some specific embodiments, filling the water seal cavity with water includes opening the water inlet valve 661 and closing the water discharge valve 651.

[0047] In some specific embodiments, draining the water in the water seal cavity includes opening the water discharge valve 651 and closing the water inlet valve 661.

[0048] The present invention will be further described below through embodiments. Unless otherwise specified, the materials in the embodiments are prepared according to existing methods or directly purchased from the market.

[0049] Embodiment 1

[0050] Combined with Figure 1 For illustration, a water seal valve for the outlet of a high-temperature filter includes an inlet pipe 61 with its inlet opening facing upward. An outer cylinder 62 with a diameter larger than that of the inlet pipe 61 is arranged around the inlet pipe 61. The lower end of the outer cylinder 62 is lower than the top end of the inlet pipe. An annular end plate 63 is arranged between the lower end of the outer cylinder 62 and the outer shell of the inlet pipe 61. The annular end plate 63 is fixedly and sealingly connected to the lower end of the outer cylinder 62 and the outer shell of the inlet pipe 61 respectively. The upper end of the outer cylinder 62 is provided with a top cover 64 with a larger lower part and a pointed upper part. An outlet pipe 67 is arranged on the outside of the outer cylinder 62. The lower end of the outlet pipe 67 is fixedly and sealingly communicated with the inner cavity of the outer cylinder 62 through an elbow. The upper end of the outer cylinder 62 is higher than the top end of the inlet pipe 61, and the upper end of the outlet pipe 67 is higher than the top end of the inlet pipe 61. A safety valve 671 is arranged on the upper part of the outlet pipe 67, and the position of the safety valve 671 is higher than the top end of the inlet pipe 61. A drain pipe 65 is arranged on the outside of the lower part or bottom of the outer cylinder 62. The upper part of the drain pipe 65 is fixedly and sealingly communicated with the inner cavity of the lower part or bottom of the outer cylinder 62. A drain valve 651 is arranged on the drain pipe 65. An inlet pipe 66 is arranged on the outside of the outer cylinder 62, and an inlet valve 661 is arranged on the inlet pipe 66.

[0051] The inlet valve 661 and the drain valve 651 adopt high-temperature resistant hard-sealed ball valves with a temperature resistance of 500 degrees; the safety valve 671 adopts a high-temperature blind plate valve.

[0052] Embodiment 2

[0053] Combined with Figure 2 For illustration, different from Embodiment 1, the top cover 64 is a conical top with a larger lower part and a pointed upper part, and the lower opening of the conical top is consistent with the diameter of the outer cylinder 62. With this structure, the strength of the top cover 64 is stronger.

[0054] Embodiment 3

[0055] A method for opening and closing a water seal valve for the outlet of a high-temperature filter. Taking the water seal valve for the outlet of a high-temperature filter provided in Embodiment 1 as an example, the specific operation is carried out according to the following steps:

[0056] When the water seal valve needs to be sealed, water is started to be filled into the water seal cavity of the water seal valve. At this time, the safety valve 671 is in the closed state, the inlet valve 661 is in the open state, the drain valve 651 is in the closed state, and the inlet pipe 66 continues to fill with water. The excess water flows into the inner wall of the inlet pipe 61 through the top end of the inlet pipe 61 and then into the preset pipeline.

[0057] When the water seal valve needs to be opened, all the water in the water seal cavity of the water seal valve is emptied. The safety valve 671 is in the open state, the inlet valve 661 is in the closed state, and the drain valve 651 is opened first and then closed after all the water is drained.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water seal valve for a high temperature filter outlet, characterized in that: The air inlet of the water seal sealing valve is directed upward along the outlet of the high-temperature filter. The water seal sealing valve comprises an air inlet pipe (61) and an outer cylinder (62) sleeved on the outer periphery of the air inlet pipe (61) and sealedly connected to the air inlet pipe (61). The outer cylinder (62) and the air inlet pipe (61) cooperate with each other to form a water seal cavity. The air outlet of the water seal sealing valve is provided with a safety valve (671).

2. The water-sealed sealing valve according to claim 1, characterized in that: The lower part of the outer cylinder (62) is provided with an air outlet pipe (67) which is in communication with the water seal cavity, and the safety valve (671) is arranged on the air outlet pipe (67).

3. The water-sealed sealing valve according to claim 1, characterized in that: The outer cylinder (62) is provided with a water discharge pipe (65) and a water inlet pipe (66) which are in communication with the water seal cavity, and the water inlet of the water discharge pipe (65) is in communication with the bottom of the water seal cavity.

4. The water-sealed sealing valve according to claim 3, characterized in that: The water discharge pipe (65) is provided with a water discharge valve (651), and the water inlet pipe (66) is provided with a water inlet valve (661).

5. The water-sealed sealing valve according to claim 1, characterized in that: The horizontal height of the safety valve (671) is greater than or equal to the horizontal height of the air outlet of the air inlet pipe (61).

6. The water-sealed sealing valve according to claim 1, characterized in that: The horizontal height of the top of the outer cylinder (62) is greater than the horizontal height of the air outlet of the air inlet pipe (61).

7. The water-sealed sealing valve according to claim 1, characterized in that: The bottom of the outer cylinder (62) is sealedly connected to the air inlet pipe (61) via an annular end plate (63), and the top of the outer cylinder (62) is sealedly connected to the top cover (64).

8. The water-sealed sealing valve according to claim 7, characterized in that: The top cover (64) is a conical structure with a larger bottom and a smaller top. The safety valve (671) is a high temperature resistant blind plate valve.

9. The method for opening and closing a water-sealed sealing valve according to any one of claims 1 to 8, characterized in that: include: When the water seal valve needs to be closed, water is filled into the water seal cavity and the safety valve (671) is closed; When the water seal valve needs to be opened, the water in the water seal cavity is drained and the safety valve (671) is opened.

10. The opening and closing method according to claim 9, characterized in that: Filling the water seal cavity with water includes opening a water inlet valve (661) and closing a water discharge valve (651); Draining the water in the water seal cavity includes opening the water discharge valve (651) and closing the water inlet valve (661).

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