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 an outlet of a high-temperature filter 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 downwards, and the water seal sealing valve comprises an air inlet 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. A safety valve on the water seal sealing valve is a safety valve, and a second safety protection guarantee is provided behind the water seal structure, so that the water seal is prevented from being broken down, and gas is ensured to be smoothly discharged outwards; in the switching process of different operation states of preheating, filtering and cyclic regeneration of the high-temperature filter, the safety valve can provide safety guarantee, and 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 particularly 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 generates 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, the temperature inside the filter must be ensured first, and then the fine coal dust is filtered and separated. Since the 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 large alloy losses 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 object of the present invention is to provide a water-sealed sealing valve for the outlet of a high-temperature filter to solve the technical problems in the prior art that the sealing valve in the sealing valve system is large in volume, the sealing ability does not meet the requirements, and there are potential safety hazards.

[0007] Another object 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 faces downward. The water seal valve includes an air inlet pipe and an outer cylinder sleeved around the air inlet pipe and sealingly connected to the air inlet pipe. The outer cylinder and the air inlet 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 air outlet pipe communicating with the water seal cavity is provided at the lower part of the outer cylinder, and the safety valve is provided on the air outlet pipe.

[0011] Further, a water discharge pipe, a water inlet pipe, and an overflow pipe communicating with the water seal cavity are provided on the outer cylinder. The water inlet of the water discharge pipe communicates with the bottom of the water seal cavity. The water inlet of the overflow pipe communicates with the water seal cavity, and the water outlet of the overflow pipe communicates with the water discharge pipe.

[0012] Further, the horizontal height of the water inlet of the overflow pipe > the horizontal height of the air outlet of the air inlet pipe.

[0013] Further, a water discharge valve is provided on the water discharge pipe; a water inlet valve is provided on the water inlet pipe; an overflow valve is provided on the overflow pipe.

[0014] The water discharge valve is located upstream of the water outlet of the overflow pipe.

[0015] Further, the upper end of the outer cylinder is sealingly connected to the air inlet pipe through an annular end plate.

[0016] Further, the lower end of the outer cylinder is lower than the lower end of the air inlet pipe.

[0017] Further, a conical pipe is provided at the lower end of the outer cylinder.

[0018] The safety valve is a high-temperature resistant blind plate valve.

[0019] In a second aspect, the present invention provides an opening and closing method for the above water seal valve, including:

[0020] When it is necessary to close the water seal valve, fill the water seal cavity with water and close the safety valve.

[0021] When it is necessary to open the water seal valve, empty the water in the water seal cavity and open the safety valve.

[0022] Further, filling the water seal cavity with water includes closing the water discharge valve and opening the water inlet valve and the overflow valve.

[0023] Emptying the water in the water seal cavity includes opening the water discharge valve and closing the water inlet valve and the overflow valve.

[0024] A water seal valve for the outlet of a high-temperature filter provided by the present invention, 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, the closing of the safety valve makes the pipelines on both sides of the water seal valve in a non-connected state, ensuring the safety and reliability of the seal. The safety valve on the water seal valve is a safety valve, which provides a second level 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; during the switching process of different operating states such as preheating, filtering, and circulating regeneration of the high-temperature filter, the safety valve can provide safety protection; compared with the high-temperature seal valve, the combined water seal valve system at the outlet of the high-temperature filter 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, and 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 does not meet the requirements, and there are potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 FIG. is a schematic structural diagram of a water seal valve system for the outlet of a high-temperature filter provided in Embodiment 1 of the present invention;

[0027] Figure 2 FIG. is a schematic structural diagram of a water seal valve system for the outlet of a high-temperature filter provided in Embodiment 2 of the present invention;

[0028] Figure 3 FIG. is a schematic structural diagram of a water seal valve system for the outlet of a high-temperature filter provided in Embodiment 3 of the present invention.

[0029] Reference numerals: 51 - intake pipe; 52 - outer cylinder; 53 - annular end plate; 54 - conical pipe; 55 - drain pipe; 551 - drain valve; 56 - water inlet pipe; 561 - water inlet valve; 57 - overflow pipe; 571 - overflow valve; 58 - outlet pipe; 581 - safety valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Unless otherwise defined herein, scientific and technical terms used in connection with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms shall be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise specified, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-restrictive.

[0031] The technical solutions 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] On the one hand, the present invention provides a water seal valve for the outlet of a high-temperature filter. The air inlet of the water seal valve faces downward. The water seal valve includes an air inlet pipe 51 and an outer cylinder 52 sleeved around the air inlet pipe 51 and hermetically connected to the air inlet pipe 51. The outer cylinder 52 and the air inlet pipe 51 cooperate with each other to form a water seal cavity, and a safety valve 581 is provided at the air outlet of the water seal valve.

[0033] The safety valve 581 is a safety guarantee valve for the water seal valve. During water sealing, the safety valve 581 is also in a closed state. Regardless of whether the air pressure fluctuates, the closing of the safety valve 581 makes the pipelines on both sides of the water seal valve in a non-connected state, ensuring the safety and reliability of the seal. The safety valve 581 on the water seal valve is a safety valve, which provides a second level of safety protection after the water seal structure to prevent the water seal from being penetrated and ensure the smooth discharge of gas to the outside; during the switching process of different operating states such as preheating, filtering, and circulating regeneration of the high-temperature filter, the safety valve can provide safety protection; compared with the high-temperature seal valve, the combined water seal valve system at the outlet of the high-temperature filter 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, but also 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.

[0034] Specifically, the safety valve 581 can adopt a high-temperature resistant blind plate valve.

[0035] Among them, the downward orientation of the air inlet of the water seal valve is conducive to discharging the coal tar precipitated at the air inlet.

[0036] In some specific embodiments, the normal operating temperature range of the high-temperature filter is 400 - 650 °C.

[0037] In some specific embodiments, an air outlet pipe 58 communicating with the water seal cavity is provided at the lower part of the outer cylinder 52, and the safety valve 581 is provided on the air outlet pipe 58.

[0038] In some specific embodiments, a water discharge pipe 55, a water inlet pipe 56 and an overflow pipe 57 communicating with the water seal cavity are provided on the outer cylinder 52. The water inlet of the water discharge pipe 55 communicates with the bottom of the water seal cavity. The water inlet of the overflow pipe 57 communicates with the water seal cavity, and the water outlet of the overflow pipe 57 communicates with the water discharge pipe 55.

[0039] In addition to the normal overflow function, if there is light tar, it can be discharged from the overflow valve through the overflow pipe 57; in addition to emptying the water, the water discharge pipe 55 can also discharge the dust and heavy tar entering the valve.

[0040] In some specific embodiments, the horizontal height of the water inlet of the overflow pipe 57 > the horizontal height of the air outlet of the air inlet pipe 51.

[0041] In some specific embodiments, a water discharge valve 551 is provided on the water discharge pipe 55; a water inlet valve 561 is provided on the water inlet pipe 56; an overflow valve 571 is provided on the overflow pipe 57.

[0042] Among them, the water discharge valve 551 and the water inlet valve 561 adopt high-temperature resistant hard-sealed ball valves that can withstand 500 °C.

[0043] In some specific embodiments, the upper end of the outer cylinder 52 is hermetically connected to the air inlet pipe 51 through an annular end plate 53.

[0044] In some specific embodiments, the lower end of the outer cylinder 52 is lower than the lower end of the air inlet pipe 51.

[0045] In some specific embodiments, the water discharge valve 551 is located upstream of the water outlet of the overflow pipe 57.

[0046] In some specific embodiments, a conical pipe 54 is provided at the lower end of the outer cylinder 52.

[0047] According to another aspect of the present invention, there is also provided a method for opening and closing the above water seal valve, including:

[0048] When it is necessary to close the water seal valve, the water seal cavity is filled with water, and the safety valve 581 is closed;

[0049] When it is necessary to open the water seal valve, the water in the water seal cavity is emptied, and the safety valve 581 is opened.

[0050] In some specific embodiments, filling water into the water seal cavity includes closing the water discharge valve 551, opening the water inlet valve 561 and the overflow valve 571.

[0051] In some specific embodiments, emptying the water in the water seal cavity includes opening the water discharge valve 551, closing the water inlet valve 561 and the overflow valve 571.

[0052] 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.

[0053] Embodiment 1

[0054] Combined with Figure 1 For description, a water seal sealing valve for the outlet of a high-temperature filter includes an intake pipe 51 with a downward intake direction. An outer cylinder 52 with a diameter larger than that of the intake pipe 51 is arranged around the intake pipe 51. The upper end of the outer cylinder 52 is higher than the lower end of the intake pipe 51. An annular end plate 53 is arranged between the upper end of the outer cylinder 52 and the outer shell of the intake pipe 51. The annular end plate 53 is fixedly and sealingly connected to the upper end of the outer cylinder 52 and the outer shell of the intake pipe 51 respectively. The lower end of the outer cylinder 52 is lower than the lower end of the intake pipe 51. A conical pipe 54 with a larger upper part and a smaller lower part is arranged at the lower end of the outer cylinder 52. The diameter of the upper end of the conical pipe 54 is the same as the diameter of the outer cylinder 52 and is fixedly and sealingly connected. A water discharge pipe 55 is arranged at the lower end of the conical pipe 54. The upper end of the water discharge pipe 55 is fixedly and sealingly communicated with the lower end of the conical pipe 54. A water discharge valve 551 is arranged at the upper part of the water discharge pipe 55. A water inlet pipe 56 and an overflow pipe 57 are respectively arranged on the side wall of the outer cylinder 52 and are fixedly and sealingly communicated with the inner cavity of the side wall of the outer cylinder 52 respectively. A water inlet valve 561 is arranged on the water inlet pipe 56. An overflow valve 571 is arranged on the overflow pipe 57. The lower end of the overflow pipe 57 is fixedly and sealingly communicated with the water discharge pipe 55 below the water discharge valve 551. An air outlet pipe 58 communicated with the water seal cavity is arranged at the lower part of the outer cylinder 52. A safety valve 581 is arranged on the air outlet pipe 58. The air outlet pipe 58 is horizontally arranged.

[0055] The water discharge valve 551, the water inlet valve 561 and the overflow valve 571 respectively adopt DN300 hard-sealed ball valves, DN20 hard-sealed ball valves and DN25 hard-sealed ball valves resistant to 500 °C high temperature; the safety valve 581 adopts a high-temperature resistant blind plate valve.

[0056] Embodiment 2

[0057] Combined with Figure 2It will be described that, different from Embodiment 1, the outlet pipe 58 is arranged outside the outer cylinder 52. Among them, one end of the outlet pipe 58 communicates with the lower part of the outer cylinder 52, the end of the outlet pipe 58 away from the outer cylinder 52 is arranged obliquely upward, and a safety valve 581 is arranged on the outlet pipe 58. This setting makes the surrounding of the safety valve 581 in the water seal valve cleaner and the sealing safer and more reliable.

[0058] Embodiment 3

[0059] Combined with Figure 3 It will be described that, different from Embodiment 1, the outlet pipe 58 is arranged outside the outer cylinder 52. Among them, one end of the outlet pipe 58 communicates with the lower part of the outer cylinder 52, the end of the outlet pipe 58 away from the outer cylinder 52 is arranged vertically upward through an elbow, and a safety valve 581 is arranged on the outlet pipe 58.

[0060] Embodiment 4

[0061] A method for opening and closing a water seal valve. Taking the water seal valve provided in Embodiment 1 as an example, the specific operations are carried out according to the following steps:

[0062] When it is necessary to fill the water seal valve with water for sealing, close the safety valve 581, open the water inlet valve 561, fill water into the water seal valve, open the overflow valve 571, and close the drain valve 551. The entire water seal valve cuts off the pipelines of the inlet pipe 51 and the outlet pipe 58.

[0063] When it is necessary to open the water seal valve, open the drain valve 551 and the safety valve 581 on the water seal valve, close the water inlet valve 561 and the overflow valve 571 to connect the inlet pipe 51 and the outlet pipe 58. The drain valve 551 can be opened first, and all the water in the combined water seal valve, including possible coal tar, is drained completely and then closed.

[0064] 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 recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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-sealed sealing valve faces downward, and the water-sealed sealing valve comprises an air inlet pipe (51) and an outer tube (52) sleeved on the outer periphery of the air inlet pipe (51) and sealedly connected to the air inlet pipe (51); the outer tube (52) and the air inlet pipe (51) cooperate with each other to form a water-sealed cavity, and a safety valve (581) is provided at the air outlet of the water-sealed sealing valve.

2. The water-sealed sealing valve according to claim 1, characterized in that: The lower part of the outer cylinder (52) is provided with an air outlet pipe (58) which is in communication with the water seal cavity, and the safety valve (581) is arranged on the air outlet pipe (58).

3. The water-sealed sealing valve according to claim 1, characterized in that: The outer cylinder (52) is provided with a drain pipe (55), a water inlet pipe (56) and an overflow pipe (57) which are connected to the water seal cavity. The water inlet of the drain pipe (55) is connected to the bottom of the water seal cavity, the water inlet of the overflow pipe (57) is connected to the water seal cavity, and the water outlet of the overflow pipe (57) is connected to the drain pipe (55).

4. The water-sealed sealing valve according to claim 3, characterized in that: The water inlet level of the overflow pipe (57) is higher than the air outlet level of the air inlet pipe (51).

5. The water-sealed sealing valve according to claim 3, characterized in that: The drain pipe (55) is provided with a drain valve (551); the water inlet pipe (56) is provided with a water inlet valve (561); the overflow pipe (57) is provided with an overflow valve (571); The drain valve (551) is located upstream of the water outlet of the overflow pipe (57).

6. The water-sealed sealing valve according to claim 1, characterized in that: The upper end of the outer cylinder (52) is sealedly connected to the air inlet pipe (51) via an annular end plate (53).

7. The water-sealed sealing valve according to claim 1, characterized in that: The lower end of the outer cylinder (52) is lower than the lower end of the air inlet pipe (51).

8. The water-sealed sealing valve according to claim 1, characterized in that: A conical tube (54) is provided at the lower end of the outer cylinder (52); The safety valve (581) 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, the water seal cavity is filled with water and the safety valve (581) is closed; When the water seal valve needs to be opened, the water in the water seal cavity is drained and the safety valve (581) is opened.

10. The opening and closing method according to claim 9, characterized in that: Filling the water seal cavity with water includes closing the drain valve (551), and opening the water inlet valve (561) and the overflow valve (571); Draining the water in the water seal cavity includes opening the water drain valve (551), and closing the water inlet valve (561) and the overflow valve (571).

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