High-temperature filter outlet combined water seal sealing valve system and gas switching method

Abstract

The invention provides a high-temperature filter outlet combined water seal sealing valve system and a gas switching method, and relates to the technical field of high-temperature sealing. A first combined water seal sealing valve is arranged between a raw gas pipeline and a high-temperature filter outlet pipe; a second combined water seal valve is arranged between the regeneration or diffusion circulating pipeline and the outlet pipe of the high-temperature filter; a water seal cavity I for preventing gas from passing through is arranged between a gas inlet and a gas outlet of the combined water seal sealing valve I, and a safety communication valve I is arranged at the gas outlet of the combined water seal sealing valve I; a second water seal cavity used for preventing gas from passing through is arranged between a gas inlet and a gas outlet of the second combined water seal valve, a safe regeneration and diffusion circulating valve is arranged at the gas outlet of the second combined water seal valve, and safety guarantee can be provided. 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 combined water seal sealing valve system for the outlet of a high-temperature filter and a gas switching method. 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, the raw gas will precipitate coal tar when it 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 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 set on the outlet pipe of the filter to meet the heating, filtering, and circulating 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 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 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 a 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 of the purposes of the present invention is to provide a combined water seal sealing valve system 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 safety hazards.

[0007] Another purpose of the present invention is to provide a gas switching method for the above-mentioned combined water seal sealing valve system 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 combined water seal sealing valve system for the outlet of a high-temperature filter, including a raw gas pipeline and a regeneration or blow-off circulation pipeline connected to the outlet pipe of the high-temperature filter. A combined water seal sealing valve I is provided between the raw gas pipeline and the outlet pipe of the high-temperature filter, and a combined water seal sealing valve II is provided between the regeneration or blow-off circulation pipeline and the outlet pipe of the high-temperature filter;

[0010] A water seal cavity I for preventing gas from passing through is provided between the inlet and outlet of the combined water seal sealing valve I, and a safety communication valve I is provided at the outlet of the combined water seal sealing valve I;

[0011] A water seal cavity II for preventing gas from passing through is provided between the inlet and outlet of the combined water seal sealing valve II, and a safety regeneration blow-off circulation valve is provided at the outlet of the combined water seal sealing valve II.

[0012] Further, the inlet of the combined water seal sealing valve I is oriented downward along the outlet of the high-temperature filter;

[0013] Preferably, the combined water seal sealing valve I includes a vertical pipe I connected to the outlet pipe of the high-temperature filter and an outer cylinder I sleeved around the periphery of the vertical pipe I and hermetically connected to the vertical pipe I. The outer cylinder I and the vertical pipe I cooperate with each other to form the water seal cavity I;

[0014] Preferably, the lower part of the outer cylinder I is communicated with the raw gas pipeline through a communication pipe I, and the safety communication valve I is located on the communication pipe I;

[0015] Preferably, a water discharge pipe I, a water inlet pipe I, and an overflow pipe I communicated with the water seal cavity I are provided on the outer cylinder I. The water inlet of the water discharge pipe I is communicated with the bottom of the water seal cavity I, the water outlet of the water discharge pipe I is communicated with the raw gas pipeline, the water inlet of the overflow pipe I is communicated with the water seal cavity I, and the water outlet of the overflow pipe I is communicated with the water discharge pipe I;

[0016] Preferably, the horizontal height of the water inlet of the overflow pipe I > the horizontal height of the outlet of the vertical pipe I;

[0017] Preferably, a water discharge valve I is provided on the water discharge pipe I; a water inlet valve I is provided on the water inlet pipe I; and an overflow valve I is provided on the overflow pipe I.

[0018] Further, the upper end of the outer cylinder I is hermetically connected to the vertical pipe I through an annular end plate I;

[0019] Preferably, the lower end of the outer cylinder I is lower than the lower end of the vertical pipe I;

[0020] Preferably, the water discharge valve I is located upstream of the water outlet of the overflow pipe 1;

[0021] Preferably, a conical pipe 1 is provided at the lower end of the outer cylinder 1.

[0022] Furthermore, the air inlet of the combined water seal valve 2 is directed upward along the outlet of the high-temperature filter;

[0023] Preferably, the combined water seal valve 2 includes a vertical pipe 2 connected to the outlet pipe of the high-temperature filter and an outer cylinder 2 sleeved around the vertical pipe 2 and hermetically connected to the vertical pipe 2. The outer cylinder 2 and the vertical pipe 2 cooperate with each other to form a water seal cavity 2;

[0024] Preferably, the lower part of the outer cylinder 2 is connected to the regeneration or blowdown circulation pipeline through an elbow, and the safety regeneration blowdown circulation valve is located on the regeneration or blowdown circulation pipeline;

[0025] Preferably, a water discharge pipe 2 and a water inlet pipe 2 communicating with the water seal cavity 2 are provided on the outer cylinder 2. The water inlet of the water discharge pipe 2 communicates with the bottom of the water seal cavity 2, and the water outlet of the water discharge pipe 2 communicates with the raw coal gas pipeline;

[0026] Preferably, the horizontal height of the safety regeneration blowdown circulation valve ≥ the horizontal height of the air outlet of the vertical pipe 2;

[0027] Preferably, the horizontal height of the top of the outer cylinder 2 > the horizontal height of the air outlet of the vertical pipe 2;

[0028] Preferably, a water discharge valve II is provided on the water discharge pipe 2, and a water inlet valve II is provided on the water inlet pipe 2.

[0029] Furthermore, the bottom of the outer cylinder 2 is hermetically connected to the vertical pipe 2 through an annular end plate 2, and the top of the outer cylinder 2 is hermetically connected to the top cover;

[0030] The top cover is a conical structure or a flat structure with a larger bottom and a smaller top, preferably a conical structure.

[0031] Furthermore, the air inlets of the combined water seal valve 1 and the combined water seal valve 2 are coaxially arranged.

[0032] Furthermore, a gas spray cooling and separation tower is also provided between the combined water seal valve 1 and the raw coal gas pipeline;

[0033] Preferably, the lower part of the outer cylinder 1 is connected to the gas spray cooling and separation tower through a connecting pipe 1;

[0034] Preferably, the water outlet of the water discharge pipe 1 communicates with the gas spray cooling and separation tower;

[0035] Preferably, the water outlet of the water discharge pipe 2 communicates with the gas spray cooling and separation tower;

[0036] Preferably, the high-temperature filter outlet pipe is inclined downward along the gas discharge direction;

[0037] Preferably, the downward inclination angle is 2 to 10°.

[0038] In a second aspect, the present invention provides a gas switching method for the above-mentioned high-temperature filter outlet combined water seal sealing valve system, including the following steps:

[0039] A. When preheating the high-temperature filter, close the combined water seal sealing valve one to cut off the high-temperature filter outlet pipe from the raw gas pipeline, open the combined water seal sealing valve two to connect the high-temperature filter outlet pipe with the regeneration or blow-down circulation pipeline, and introduce the gas for preheating into the high-temperature filter. The preheated gas flows along the high-temperature filter outlet pipe, passes through the combined water seal sealing valve two and the regeneration or blow-down circulation pipeline and is discharged;

[0040] B. When the preheating of the high-temperature filter is completed, open the combined water seal sealing valve one to connect the high-temperature filter outlet pipe with the raw gas pipeline. At the same time, close the combined water seal sealing valve two to cut off the high-temperature filter outlet pipe from the regeneration or blow-down circulation pipeline, and introduce the raw gas to be filtered. The raw gas filtered by the high-temperature filter flows along the high-temperature filter outlet pipe, passes through the combined water seal sealing valve one and the raw gas pipeline and is discharged.

[0041] Further, the closing of the combined water seal sealing valve one includes filling the first water seal cavity with water and closing the safety connection valve I;

[0042] Preferably, the filling of the first water seal cavity with water includes closing the drain valve I and opening the inlet valve I and the overflow valve I;

[0043] Preferably, the opening of the combined water seal sealing valve one includes discharging the water in the first water seal cavity and opening the safety connection valve I;

[0044] Preferably, the discharging of the water in the first water seal cavity includes opening the drain valve I and closing the inlet valve I and the overflow valve I;

[0045] Preferably, the closing of the combined water seal sealing valve two includes filling the second water seal cavity with water and closing the safety regeneration and blow-down circulation valve;

[0046] Preferably, the filling of the second water seal cavity with water includes opening the inlet valve II and closing the drain valve II;

[0047] Preferably, the opening of the combined water seal sealing valve two includes discharging the water in the second water seal cavity and opening the safety regeneration and blow-down circulation valve;

[0048] Preferably, the discharging of the water in the second water seal cavity includes opening the drain valve II and closing the inlet valve II.

[0049] Further, it further includes step C. When switching to the standby high-temperature filter, enable the standby high-temperature filter outlet combined water seal sealing valve system connected to the standby high-temperature filter, and perform gas switching on the standby high-temperature filter outlet combined water seal sealing valve system according to steps A and B.

[0050] Preferably, after switching to the standby high-temperature filter, if the original high-temperature filter needs to be regenerated, close the combined water seal sealing valve in the original high-temperature filter to cut off the high-temperature filter outlet pipe from the raw coal gas pipeline, open the combined water seal sealing valve II to connect the high-temperature filter outlet pipe to the regeneration or blow-off circulation pipeline, and introduce air for regeneration, so that the gas discharged after regeneration is discharged along the combined water seal sealing valve II through the regeneration or blow-off circulation pipeline.

[0051] A high-temperature filter outlet combined water seal sealing valve system provided by the present invention. The safety connection valve I in the system is the safety guarantee valve of the combined water seal sealing valve I. When in water seal, the safety connection valve I is also in the closed state. Whether the air pressure fluctuates or not, with the safety connection valve I closed, it is impossible to connect the raw coal gas pipeline and the high-temperature filter outlet pipe, ensuring the safety and reliability of the seal. The safety regeneration and blow-off circulation valve is the safety guarantee valve of the combined water seal sealing valve II. When in water seal, whether the air pressure fluctuates or not, with the safety regeneration and blow-off circulation valve closed, it is impossible to connect the regeneration or blow-off circulation pipeline and the high-temperature filter outlet pipe, ensuring the safety and reliability of the seal. The safety connection valve I on the combined water seal sealing valve I and the safety regeneration and blow-off circulation valve on the combined water seal sealing valve II, as safety valves, provide 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 outward; during the switching process of different operating states such as preheating, filtering, and cyclic regeneration of the high-temperature filter, the safety valves can provide safety protection; compared with the high-temperature sealing valve, the high-temperature filter outlet combined water seal sealing valve system has high sealing safety and a small volume; compared with the liquid metal sealing valve, there is no sealing cover lifting structure when the combined water seal sealing valve I and the combined water seal sealing valve II are opened and closed, avoiding liquid splashing, and only circulating water is required. 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 sealing valve in the sealing valve system has a large volume, the sealing ability does not meet the requirements, and there are potential safety hazards. Description of the Drawings

[0052] 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 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 also be obtained based on these drawings.

[0053] Figure 1 Schematic structural diagram of a combined water seal sealing valve system at the outlet of a high-temperature filter provided in Embodiment 1 of the present invention.

[0054] Icon: 10 - High-temperature filter; 11 - High-temperature filter outlet pipe;

[0055] 20 - Gas spray cooling and separation tower; 201 - Spraying mechanism;

[0056] 30 - Raw gas pipeline;

[0057] 40 - Regeneration or relief circulation pipeline; 401 - Safety regeneration and relief circulation valve;

[0058] 50 - Combined water seal sealing valve one; 51 - Vertical pipe one; 52 - Outer cylinder one; 53 - Annular end plate one; 54 - Conical pipe one; 55 - Drain pipe one; 551 - Drain valve Ⅰ; 56 - Water inlet pipe one; 561 - Water inlet valve Ⅰ; 57 - Overflow pipe one; 58 - Connecting pipe one; 581 - Safety connecting valve Ⅰ;

[0059] 60 - Combined water seal sealing valve two; 61 - Vertical pipe two; 62 - Outer cylinder two; 63 - Annular end plate two; 64 - Top cover; 65 - Drain pipe two; 651 - Drain valve Ⅱ; 66 - Water inlet pipe two; 661 - Water inlet valve Ⅱ. Specific embodiments

[0060] 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 meanings and scopes of the terms should 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 "including" and other forms is non-restrictive.

[0061] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0062] On the one hand, the present invention provides a combined water seal sealing valve system at the outlet of a high-temperature filter, which includes a raw gas pipeline 30 and a regeneration or blow-off circulation pipeline 40 connected to the outlet pipe 11 of the high-temperature filter. A combined water seal sealing valve one 50 is provided between the raw gas pipeline 30 and the outlet pipe 11 of the high-temperature filter, and a combined water seal sealing valve two 60 is provided between the regeneration or blow-off circulation pipeline 40 and the outlet pipe 11 of the high-temperature filter;

[0063] Between the air inlet and the air outlet of the combined water seal sealing valve one 50, there is a water seal cavity one for preventing gas from passing through, and a safety communication valve I 581 is provided at the air outlet of the combined water seal sealing valve one 50;

[0064] Between the air inlet and the air outlet of the combined water seal sealing valve two 60, there is a water seal cavity two for preventing gas from passing through, and a safety regeneration blow-off circulation valve 401 is provided at the air outlet of the combined water seal sealing valve two 60.

[0065] The safety communication valve I 581 in the system is the safety guarantee valve of the combined water seal sealing valve one 50. During water sealing, the safety communication valve I 581 is also in the closed state. Regardless of whether the air pressure fluctuates, with the safety communication valve I 581 closed, it is impossible to communicate between the raw gas pipeline 30 and the outlet pipe 11 of the high-temperature filter, ensuring the safety and reliability of the seal; the safety regeneration blow-off circulation valve 401 is the safety guarantee valve of the combined water seal sealing valve two 60. During water sealing, regardless of whether the air pressure fluctuates, with the safety regeneration blow-off circulation valve 401 closed, it is impossible to communicate between the regeneration or blow-off circulation pipeline 40 and the outlet pipe 11 of the high-temperature filter, ensuring the safety and reliability of the seal. The safety communication valve I 581 on the combined water seal sealing valve one 50 and the safety regeneration blow-off circulation valve 401 on the combined water seal sealing valve two 60, as safety valves, provide a second layer of safety protection after the water seal structure to prevent the water seal from being penetrated and ensure the smooth discharge of gas outward; during the switching process of different operating states such as preheating, filtering, and circulating regeneration of the high-temperature filter, the safety valves can provide safety protection; compared with high-temperature sealing valves, the combined water seal sealing valve system at the outlet of the high-temperature filter has high sealing safety and a small volume; compared with liquid metal sealing valves, there is no sealing cover lifting structure when the combined water seal sealing valve one 50 and the combined water seal sealing valve two 60 are opened and closed, avoiding liquid splashing, and only circulating water is required. It can use the "ammonia water" separated by 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 sealing valve in the sealing valve system is large in volume, the sealing ability fails to meet the requirements, and there are potential safety hazards.

[0066] Specifically, the safety communication valve I 581 and the safety regeneration blow-off circulation valve 401 can adopt high-temperature resistant blind plate valves.

[0067] In some specific embodiments, the air inlet of the combined water seal valve 50 is directed downward along the outlet of the high-temperature filter; in some specific embodiments, the air inlet of the combined water seal valve 60 is directed upward along the outlet of the high-temperature filter.

[0068] The downward direction of the air inlet of the combined water seal valve 50 is beneficial for discharging the coal tar precipitated at the air inlet, and the upward direction of the air inlet of the combined water seal valve 60 is beneficial for discharging the coal tar precipitated at the air inlet along with the water seal liquid overflowing from the air inlet of the combined water seal valve 60.

[0069] In some specific embodiments, the normal operating temperature range of the high-temperature filter is 400 - 650 °C.

[0070] In some specific embodiments, the combined water seal valve 50 includes a vertical pipe 51 connected to the outlet pipe 11 of the high-temperature filter and an outer cylinder 52 sleeved outside the vertical pipe 51 and hermetically connected to the vertical pipe 51. The outer cylinder 52 and the vertical pipe 51 cooperate with each other to form a water seal cavity 1.

[0071] In some specific embodiments, the lower part of the outer cylinder 52 is communicated with the raw gas pipeline 30 through a connecting pipe 58, and the safety connecting valve I 581 is located on the connecting pipe 58.

[0072] Among them, the connecting pipe 58 is the air outlet of the combined water seal valve 50. In application, its direction can be set according to the position of the subsequent connected raw gas pipeline 30 or the gas spray cooling and separation tower 20. Specifically, it can be horizontally arranged, upwardly inclined or connected to the outer cylinder 52 through an elbow. Preferably, it is upwardly inclined.

[0073] In some specific embodiments, the outer cylinder 52 is provided with a water discharge pipe 55, a water inlet pipe 56 and an overflow pipe 57 communicated with the water seal cavity 1. The water inlet of the water discharge pipe 55 is communicated with the bottom of the water seal cavity 1, the water outlet of the water discharge pipe 55 is communicated with the raw gas pipeline 30, the water inlet of the overflow pipe 57 is communicated with the water seal cavity 1, and the water outlet of the overflow pipe 57 is communicated with the water discharge pipe 55.

[0074] In addition to the normal overflow water function, if there is light tar, it can be discharged from the overflow valve 1; in addition to the function of emptying water, the water discharge pipe 55 can also discharge the dust and heavy tar entering the valve.

[0075] 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 vertical pipe 51.

[0076] In some specific embodiments, a drain valve I 551 is provided on the drain pipe I 55; an inlet valve I 561 is provided on the inlet pipe I 56; and an overflow valve I 571 is provided on the overflow pipe I 57.

[0077] Among them, the drain valve I 551 and the inlet valve I 561 adopt high-temperature hard-sealed ball valves resistant to 500 °C.

[0078] In some specific embodiments, the upper end of the outer cylinder I 52 is hermetically connected to the vertical pipe I 51 through an annular end plate I 53.

[0079] In some specific embodiments, the lower end of the outer cylinder I 52 is lower than the lower end of the vertical pipe I 51.

[0080] In some specific embodiments, the drain valve I 551 is located upstream of the water outlet of the overflow pipe I 57.

[0081] In some specific embodiments, a conical pipe I 54 is provided at the lower end of the outer cylinder I 52.

[0082] In some specific embodiments, the combined water seal valve II 60 includes a vertical pipe II 61 connected to the outlet pipe 11 of the high-temperature filter and an outer cylinder II 62 sleeved around the vertical pipe II 61 and hermetically connected to the vertical pipe II 61. The outer cylinder II 62 and the vertical pipe II 61 cooperate with each other to form a water seal cavity II.

[0083] Among them, the top end of the vertical pipe II 61 also functions as an overflow, and the overflow water can also wash off the tar and dust adhering to the inner wall of the vertical pipe II 61.

[0084] In some specific embodiments, the lower part of the outer cylinder II 62 is connected to the regeneration or blowdown circulation pipeline 40 through an elbow, and the safety regeneration blowdown circulation valve 401 is located on the regeneration or blowdown circulation pipeline 40.

[0085] In some specific embodiments, a drain pipe II 65 and an inlet pipe II 66 communicating with the water seal cavity II are provided on the outer cylinder II 62. The water inlet of the drain pipe II 65 is communicated with the bottom of the water seal cavity II, and the water outlet of the drain pipe II 65 is communicated with the raw coal gas pipeline 30.

[0086] In some specific embodiments, the horizontal height of the safety regeneration blowdown circulation valve 401 ≥ the horizontal height of the gas outlet of the vertical pipe II 61.

[0087] In some specific embodiments, the horizontal height of the top of the outer cylinder II 62 > the horizontal height of the gas outlet of the vertical pipe II 61.

[0088] In some specific embodiments, a drain valve II 651 is provided on the second drain pipe 65, and an inlet valve II 661 is provided on the second inlet pipe 66.

[0089] Among them, the drain valve II 651 and the inlet valve II 661 adopt high-temperature resistant hard-sealed ball valves that can withstand 500 °C.

[0090] In some specific embodiments, the bottom of the second outer cylinder 62 is hermetically connected to the second vertical pipe 61 through an annular end plate II 63, and the top end of the second outer cylinder 62 is hermetically connected to the top cover 64.

[0091] In some specific embodiments, the top cover 64 is a conical structure or a flat structure with a larger bottom and a smaller top, preferably a conical structure.

[0092] In some specific embodiments, the air inlets of the combined water seal valve I 50 and the combined water seal valve II 60 are coaxially arranged, which is beneficial to discharging the coal tar that may be precipitated from the air inlet of the combined water seal valve II 60 into the combined water seal valve I 50. Specifically, the second vertical pipe 61 and the first vertical pipe 51 are coaxially arranged.

[0093] In some specific embodiments, a gas spray cooling and separation tower 20 is further provided between the combined water seal valve I 50 and the raw gas pipeline 30.

[0094] Among them, the gas spray cooling and separation tower 20 is provided with a spray cooling mechanism. The gas spray cooling and separation tower 20 cools most of the coal tar in the raw gas through the spray cooling mechanism and mixes it into the water, separating it from the atmosphere that is not easily condensable in the raw gas.

[0095] In some specific embodiments, the lower part of the first outer cylinder 52 is connected to the gas spray cooling and separation tower 20 through a first connecting pipe 58.

[0096] Among them, the first connecting pipe 58 can be horizontal or inclined.

[0097] In some specific embodiments, the outlet of the first drain pipe 55 is connected to the gas spray cooling and separation tower 20.

[0098] In some specific embodiments, the outlet of the second drain pipe 65 is connected to the gas spray cooling and separation tower 20.

[0099] In some specific embodiments, the high-temperature filter outlet pipe 11 is inclined downward along the gas discharge direction, which is beneficial to solving the problem that the coal tar that may be condensed and precipitated from the raw gas stays in the high-temperature filter outlet pipe and can be quickly discharged into the first vertical pipe 51. Optionally, the downward inclination angle is 2 to 10°.

[0100] According to another aspect of the present invention, there is also provided a gas switching method for the above-mentioned high-temperature filter outlet combined water seal sealing valve system, including the following steps:

[0101] A. When preheating the high-temperature filter, close the combined water seal sealing valve I 50 to cut off the high-temperature filter outlet pipe 11 and the raw coal gas pipeline 30, and open the combined water seal sealing valve II 60 to connect the high-temperature filter outlet pipe 11 and the regeneration or blow-off circulation pipeline 40. Introduce the gas for preheating into the high-temperature filter, and the preheated gas flows along the high-temperature filter outlet pipe 11, passes through the combined water seal sealing valve II 60 and the regeneration or blow-off circulation pipeline 40 and is discharged.

[0102] B. When the preheating of the high-temperature filter is completed, open the combined water seal sealing valve I 50 to connect the high-temperature filter outlet pipe 11 and the raw coal gas pipeline 30. At the same time, close the combined water seal sealing valve II 60 to cut off the high-temperature filter outlet pipe 11 and the regeneration or blow-off circulation pipeline 40. Introduce the raw coal gas to be filtered, and the raw coal gas filtered by the high-temperature filter flows along the high-temperature filter outlet pipe 11, passes through the combined water seal sealing valve I 50 and the raw coal gas pipeline 30 and is discharged.

[0103] During preheating, the gas used to heat the high-temperature filter is discharged through the combined water seal sealing valve II 60, so that the internal temperature of the high-temperature filter is gradually heated to the temperature range of the pyrolysis gas, so as to avoid the coal tar in the pyrolysis gas from condensing and precipitating at low temperature; after the preheating is completed, by opening the combined water seal sealing valve I 50, the coal tar falling into the combined water seal sealing valve I 50 can be discharged completely.

[0104] In some specific embodiments, the closing of the combined water seal sealing valve I 50 includes filling the first water seal cavity with water and closing the safety communication valve I 581; in some specific embodiments, the filling of the first water seal cavity with water includes closing the first drain valve and opening the first inlet valve and the first overflow valve.

[0105] In some specific embodiments, the opening of the combined water seal sealing valve I 50 includes discharging the water in the first water seal cavity and opening the safety communication valve I 581; in some specific embodiments, the discharging of the water in the first water seal cavity includes opening the first drain valve 551 and closing the first inlet valve 561 and the first overflow valve.

[0106] In some specific embodiments, the closing of the combined water seal sealing valve II 60 includes filling the second water seal cavity with water and closing the safety regeneration and blow-off circulation valve 401; in some specific embodiments, the filling of the second water seal cavity with water includes opening the second inlet valve 661 and closing the second drain valve 651.

[0107] In some specific embodiments, the opening combined water seal sealing valve II 60 includes discharging the water in the water seal cavity II and opening the safety regeneration and relief circulation valve 401; in some specific embodiments, discharging the water in the water seal cavity II includes opening the drain valve II 651 and closing the inlet valve II 661.

[0108] In some specific embodiments, it further includes step C. When switching to the standby high-temperature filter, enable the standby combined water seal sealing valve system at the outlet of the standby high-temperature filter connected to the standby high-temperature filter, and perform gas switching on the standby combined water seal sealing valve system at the outlet of the standby high-temperature filter according to steps A and B.

[0109] Preferably, after switching to the standby high-temperature filter, if the original high-temperature filter needs to be regenerated, close the combined water seal sealing valve I 50 in the original high-temperature filter to cut off the high-temperature filter outlet pipe 11 from the raw coal gas pipeline 30, open the combined water seal sealing valve II 60 to connect the high-temperature filter outlet pipe 11 with the regeneration or relief circulation pipeline 40, and introduce air for regeneration, so that the gas discharged after regeneration is discharged along the combined water seal sealing valve II 60 through the regeneration or relief circulation pipeline 40.

[0110] Switching to the standby high-temperature filter includes opening the standby high-temperature filter, preheating the standby high-temperature filter according to step A, and filtering the raw coal gas with the standby high-temperature filter according to step B.

[0111] 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.

[0112] Embodiment 1

[0113] Combined with Figure 1 For illustration, a combined water seal sealing valve system at the outlet of a high-temperature filter includes a gas spray cooling and separation tower 20 connected to the high-temperature filter outlet pipe 11, the gas spray cooling and separation tower 20 is connected to the raw coal gas pipeline 30 at the back, another path connected to the high-temperature filter outlet pipe 11 is a regeneration or relief circulation pipeline 40 for regeneration, relief or preheating circulation, a combined water seal sealing valve I 50 is arranged between the high-temperature filter outlet pipe 11 and the gas spray cooling and separation tower 20; a combined water seal sealing valve II 60 is arranged between the high-temperature filter outlet pipe 11 and the regeneration or relief circulation pipeline 40; each combined water seal sealing valve of the water seal sealing valve system is provided with a safety valve to prevent water seal breakdown. When the combined water seal sealing valve I 50 and the combined water seal sealing valve II 60 are in operation, they cannot be in the sealed state at the same time to ensure the gas discharged from the dust collector is discharged outward.

[0114] Among them, the high-temperature filter outlet pipe 11 of the high-temperature filter 10 is inclined downward by 2-10° at one end far from the high-temperature filter. In this embodiment, the inclination angle is 5°.

[0115] The structure of the combined water seal valve 50 is as follows: A vertical pipe 51 is arranged below the high-temperature filter outlet pipe 11 and serves as the air inlet of the valve. An outer cylinder 52 with a diameter larger than that of the vertical pipe 51 is arranged around the vertical pipe 51. The upper end of the outer cylinder 52 is higher than the lower end of the vertical pipe 51. An annular end plate 53 is arranged between the upper end of the outer cylinder 52 and the outer shell of the vertical pipe 51. The annular end plate 53 is fixedly and hermetically connected to the upper end of the outer cylinder 52 and the outer shell of the vertical pipe 51 respectively. The lower end of the outer cylinder 52 is lower than the lower end of the vertical 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 that of the outer cylinder 52 and they are fixedly and hermetically 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 hermetically communicated with the lower end of the conical pipe 54. The lower end of the water discharge pipe 55 is communicated with the gas spray cooling and separation tower 20 or the raw gas pipeline 30 connected behind the gas spray cooling and separation tower. A water discharge valve I 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 hermetically communicated with the inner cavity of the side wall of the outer cylinder 52. A water inlet valve I 561 is arranged on the water inlet pipe 56. An overflow valve I 571 is arranged on the overflow pipe 57. The lower end of the overflow pipe 57 is fixedly and hermetically communicated with the water discharge pipe 55 below the water discharge valve I 551. A communication pipe 58 is arranged between the lower inner cavity of the outer cylinder 52 and the upper inner cavity of the gas spray cooling and separation tower 20. A safety communication valve I 581 is arranged on the communication pipe 58.

[0116] The structure of the combined water seal sealing valve II 60 is as follows: A vertical pipe II 61 is arranged above the outlet pipe 11 of the high-temperature filter, which serves as the air inlet of the valve. An outer cylinder II 62 with a diameter larger than that of the vertical pipe II 61 is arranged around the vertical pipe II 61. The lower end of the outer cylinder II 62 is lower than the top end of the vertical pipe II. An annular end plate II 63 is arranged between the lower end of the outer cylinder II 62 and the outer shell of the vertical pipe II 61. The annular end plate II 63 is fixedly and sealingly connected to the lower end of the outer cylinder II 62 and the outer shell of the vertical pipe II 61 respectively. The upper end of the outer cylinder II 62 is provided with a top cover 64 with a large lower part and a pointed upper part. The lower opening of the top cover 64 is consistent with the diameter of the outer cylinder II 62. A vertical regeneration or gas release circulation pipe 40 is arranged outside the outer cylinder II 62. The lower end of the regeneration or gas release circulation pipe 40 is fixedly and sealingly communicated with the inner cavity of the outer cylinder II 62 through an elbow. The upper end of the outer cylinder II 62 is higher than the top end of the vertical pipe II 61. The upper end of the regeneration or gas release circulation pipe 40 is higher than the top end of the vertical pipe II 61. A safety regeneration and gas release circulation valve 401 for gas release or gas preheating is arranged in the upper part of the regeneration or gas release circulation pipe 40. The position of the safety regeneration and gas release circulation valve 401 is higher than the top end of the vertical pipe II 61. A drain pipe II 65 is arranged outside the lower part or bottom of the outer cylinder II 62. The upper part of the drain pipe II 65 is fixedly and sealingly communicated with the inner cavity of the lower part or bottom of the outer cylinder II 62. The lower end of the drain pipe II 65 is fixedly and sealingly communicated with the gas spray cooling and separation tower or the raw gas pipeline 30. A drain valve II 651 is arranged on the drain pipe II 65. An inlet pipe II 66 is arranged outside the outer cylinder II 62. An inlet valve II 661 is arranged on the inlet pipe II 66.

[0117] The vertical pipe II 61 is vertically aligned with the vertical pipe I 51.

[0118] The drain valve I 551, inlet valve I 561, overflow valve I 571, inlet valve II 661, and drain valve II 651 adopt high-temperature resistant hard-sealed ball valves that can withstand 500°C; the safety connection valve I 581 and the safety regeneration and gas release circulation valve 401 adopt high-temperature resistant blind plate valves.

[0119] The gas spray cooling and separation tower is provided with a spray cooling mechanism, and the spray water is circulating ammonia water.

[0120] Embodiment 2

[0121] A gas switching method for a high-temperature filter outlet combined water seal sealing valve system is specifically operated according to the following steps:

[0122] (1) Before the high-temperature filter enters the pyrolysis gas, first fill the combined water seal valve 1-50 with water. At this time, the safety connection valve I-581 is closed, the water inlet valve I-561 and the overflow valve I-571 are opened, and the drain valve I-551 is closed. The entire combined water seal valve 1-50 cuts off the pipeline between the high-temperature filter outlet pipe 11 and the raw gas pipeline 30. There is no water in the combined water seal valve 2-60. The safety regeneration and discharge circulation valve 401 is in the open state, and the water inlet valve II-661 and the drain valve II-651 are in the closed state. The gas used to heat the high-temperature filter is discharged through the combined water seal valve 2-60, gradually heating the internal temperature of the high-temperature filter to the temperature range of the pyrolysis gas, so as to avoid the coal tar in the pyrolysis gas from condensing out at low temperature and adhering to the filter, especially the filter element of the high-temperature filter, or even clogging the capillary pores of the filter element, resulting in filtration failure.

[0123] (2) When the high-temperature filter is preheated to the same temperature as the pyrolysis gas and the oxygen content is less than 1%, first open the drain valve I-551 and the safety connection valve I-581 on the combined water seal valve 1, and close the water inlet valve I-561 to connect the pipeline between the high-temperature filter outlet pipe 11 and the raw gas pipeline 30. The drain valve I-551 can be opened first to drain all the water, including possible coal tar, in the combined water seal valve 1-50 and then closed. The raw gas is connected to the spray tower 20 through the safety connection valve I-581, and the spray mechanism 201 of the spray tower 20 can start spraying and cooling in advance. At the same time, water starts to be filled into the combined water seal valve 2-60. The safety regeneration and discharge circulation valve 401 is in the closed state, the water inlet valve II-661 is in the open state, and the drain valve II-651 is in the closed state. The second water inlet pipe 66 continuously fills water into the combined water seal valve 2-60, and the excess water flows into the inner wall of the second vertical pipe 61 from the top of the second vertical pipe 61 and then into the first vertical pipe 51. At this time, the drain valve I-551 can be opened to an appropriate opening degree to timely discharge the liquid entering the combined water seal valve 1, and at the same time, it is necessary to ensure that as much raw gas as possible enters the spray tower.

[0124] Example 3

[0125] When the high-temperature filter fails or needs to be regenerated, the coal pyrolysis equipment cannot stop due to the regeneration or failure of the high-temperature filter. Therefore, there is at least one set of standby high-temperature filters for the high-temperature filter to ensure the continuous operation of the coal pyrolysis equipment. The switch to the standby high-temperature filter can be carried out according to the following steps:

[0126] First, after preheating the standby high-temperature filter 10 by switching the gas of the high-temperature filter outlet combined water seal sealing valve system connected to the standby high-temperature filter 10 according to the steps in (1) of Embodiment 2, switch the raw gas inlet of the original high-temperature filter 10 to the raw gas inlet of the preheated standby high-temperature filter 10, and switch the gas of the high-temperature filter outlet combined water seal sealing valve system connected to the standby high-temperature filter 10 according to the steps in (2) of Embodiment 2 to make the standby high-temperature filter 10 enter the raw gas filtering state.

[0127] If the standby high-temperature filter 10 fails or needs to be regenerated, it can be reversely switched to the original high-temperature filter 10 according to the above steps; the two sets of high-temperature filters 10 can be repeatedly used in cycles as described above.

[0128] When the air permeability of the high-temperature filter element in the high-temperature filter is poor and the high-temperature filter element needs to be regenerated, stop using the original high-temperature filter 10 to filter the raw gas. According to the steps in (1) of Embodiment 2, fill water into the combined water seal sealing valve I 50 to make the entire combined water seal sealing valve I in a closed state, close the water inlet valve II 661, open the water discharge valve II 651, drain all the water from the combined water seal sealing valve II 60, keep the safety regeneration and discharge circulation valve 401 in an open state, introduce a small amount of air into the filter to be regenerated, and make the air oxidize the filtered coal powder and coal tar adhered to the filter element. Control the air volume to keep the temperature of the filter within the normal temperature range. It is also possible to mix part of the waste gas generated during regeneration into the air to make the regeneration safer. After the regeneration is completed, blow back to remove the impurities adhered to the filter element to achieve a filtering capacity equivalent to that of a new filter element.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; 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 high-temperature filter outlet combined water seal valve system, characterized in that: It comprises a raw gas pipeline (30) and a regeneration or release circulation pipeline (40) connected to a high-temperature filter outlet pipe (11), a combined water seal valve 1 (50) is provided between the raw gas pipeline (30) and the high-temperature filter outlet pipe (11), and a combined water seal valve 2 (60) is provided between the regeneration or release circulation pipeline (40) and the high-temperature filter outlet pipe (11); A water seal cavity 1 for preventing gas from passing through is provided between the air inlet and the air outlet of the combined water seal sealing valve 1 (50), and a safety connecting valve Ⅰ (581) is provided at the air outlet of the combined water seal sealing valve 1 (50); A water seal cavity 2 for preventing gas from passing through is provided between the air inlet and the air outlet of the combined water seal sealing valve 2 (60), and a safety regeneration and release circulation valve (401) is provided at the air outlet of the combined water seal sealing valve 2 (60).

2. The high temperature filter outlet combined water seal valve system according to claim 1, characterized in that: The air inlet of the combined water seal valve 1 (50) is directed downward along the outlet of the high temperature filter; Preferably, the combined water-sealed sealing valve (50) comprises a vertical tube (51) connected to the high-temperature filter outlet pipe (11) and an outer tube (52) sleeved on the outer periphery of the vertical tube (51) and sealedly connected to the vertical tube (51), wherein the outer tube (52) and the vertical tube (51) cooperate with each other to form a water-sealed cavity (51); Preferably, the lower portion of the outer cylinder 1 (52) is connected to the raw gas pipeline (30) through a connecting pipe 1 (58), and the safety connecting valve Ⅰ (581) is located on the connecting pipe 1 (58); Preferably, the outer tube (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 (5), the water inlet of the drain pipe (55) is connected to the bottom of the water seal cavity (5), the water outlet of the drain pipe (55) is connected to the raw gas pipeline (30), the water inlet of the overflow pipe (57) is connected to the water seal cavity (5), and the water outlet of the overflow pipe (57) is connected to the drain pipe (55); Preferably, the water inlet level of the overflow pipe 1 (57) is greater than the air outlet level of the vertical pipe 1 (51). Preferably, the drain pipe 1 (55) is provided with a drain valve I (551); the water inlet pipe 1 (56) is provided with a water inlet valve I (561); and the overflow pipe 1 (57) is provided with an overflow valve I (571).

3. The high temperature filter outlet combined water seal valve system according to claim 2, characterized in that: The upper end of the outer cylinder 1 (52) is sealedly connected to the vertical tube 1 (51) via an annular end plate 1 (53); Preferably, the lower end of the outer tube 1 (52) is lower than the lower end of the vertical tube 1 (51); Preferably, the drain valve I (551) is located upstream of the water outlet of the overflow pipe I (57); Preferably, a conical tube (54) is provided at the lower end of the outer cylinder (52).

4. The high temperature filter outlet combined water seal valve system according to claim 1, characterized in that: The air inlet of the second combined water seal valve (60) is directed upward along the outlet of the high temperature filter; Preferably, the combined water-sealed sealing valve (60) comprises a vertical tube (61) connected to the high-temperature filter outlet pipe (11) and an outer tube (62) sleeved on the outer periphery of the vertical tube (61) and sealedly connected to the vertical tube (61), wherein the outer tube (62) and the vertical tube (61) cooperate with each other to form a water-sealed cavity (61); Preferably, the lower portion of the second outer cylinder (62) is connected to the regeneration or release circulation pipeline (40) through an elbow, and the safety regeneration and release circulation valve (401) is located on the regeneration or release circulation pipeline (40); Preferably, the second outer tube (62) is provided with a second drain pipe (65) and a second water inlet pipe (66) which are connected to the second water seal cavity, the water inlet of the second drain pipe (65) is connected to the bottom of the second water seal cavity, and the water outlet of the second drain pipe (65) is connected to the raw gas pipeline (30); Preferably, the horizontal height of the safety regeneration release circulation valve (401) is ≥ the horizontal height of the air outlet of the second vertical pipe (61); Preferably, the horizontal height of the top of the second outer tube (62) is greater than the horizontal height of the air outlet of the second vertical tube (61); Preferably, the second water discharge pipe (65) is provided with a water discharge valve II (651), and the second water inlet pipe (66) is provided with a water inlet valve II (661).

5. The high temperature filter outlet combined water seal valve system according to claim 4, characterized in that: The bottom of the second outer tube (62) is sealedly connected to the second vertical tube (61) through the second annular end plate (63), and the top of the second outer tube (62) is sealedly connected to the top cover (64); Preferably, the top cover (64) is a conical structure or a flat structure that is larger at the bottom and smaller at the top, preferably a conical structure.

6. The high temperature filter outlet combined water seal valve system according to any one of claims 1 to 5, characterized in that: The air inlet of the combined water seal sealing valve 1 (50) and the air inlet of the combined water seal sealing valve 2 (60) are coaxially arranged.

7. The high temperature filter outlet combined water seal valve system according to claim 6, characterized in that: A gas spray cooling and separation tower (20) is also provided between the combined water seal valve 1 (50) and the raw gas pipeline (30); Preferably, the lower portion of the outer cylinder 1 (52) is connected to the coal gas spray cooling separation tower (20) via a connecting pipe 1 (58); Preferably, the water outlet of the water discharge pipe 1 (55) is connected to the gas spray cooling separation tower (20); Preferably, the water outlet of the second water discharge pipe (65) is connected to the gas spray cooling separation tower (20); Preferably, the high temperature filter outlet pipe (11) is inclined downward along the gas discharge direction; Preferably, the downwardly inclined angle is 2 to 10 degrees.

8. The gas switching method of the combined water seal valve system at the outlet of the high temperature filter according to any one of claims 1 to 7, characterized in that: The following steps are involved: A. When preheating the high-temperature filter, close the combined water seal valve 1 (50) to cut off the high-temperature filter outlet pipe (11) and the raw gas pipeline (30), open the combined water seal valve 2 (60) to connect the high-temperature filter outlet pipe (11) and the regeneration or release circulation pipeline (40), and introduce the gas for preheating into the high-temperature filter. The preheated gas is discharged along the high-temperature filter outlet pipe (11), through the combined water seal valve 2 (60) and the regeneration or release circulation pipeline (40); B. After the high-temperature filter is preheated, the combined water seal valve 1 (50) is opened to connect the high-temperature filter outlet pipe (11) with the raw gas pipeline (30). At the same time, the combined water seal valve 2 (60) is closed to cut off the high-temperature filter outlet pipe (11) and the regeneration or release circulation pipeline (40). Raw gas to be filtered is introduced, and the raw gas filtered by the high-temperature filter is discharged along the high-temperature filter outlet pipe (11) through the combined water seal valve 1 (50) and the raw gas pipeline (30).

9. The gas switching method according to claim 8, characterized in that: Closing the combined water seal sealing valve 1 (50) includes filling the water seal cavity 1 with water and closing the safety connecting valve 1 (581); Preferably, the step of filling the water seal cavity with water comprises closing the drain valve I (551), and opening the water inlet valve I (561) and the overflow valve I (571); Preferably, the opening of the combined water seal sealing valve 1 (50) includes draining the water in the water seal cavity 1 and opening the safety connecting valve Ⅰ (581); Preferably, draining the water in the water seal cavity 1 includes opening the water release valve Ⅰ (551), and closing the water inlet valve Ⅰ (561) and the overflow valve Ⅰ (571); Preferably, the closing of the combined water seal sealing valve 2 (60) comprises filling the water seal cavity 2 with water and closing the safety regeneration release circulation valve (401); Preferably, the step of filling the water seal cavity II with water comprises opening a water inlet valve II (661) and closing a water discharge valve II (651); Preferably, the opening of the combined water seal sealing valve 2 (60) includes draining the water in the water seal cavity 2 and opening the safety regeneration release circulation valve (401); Preferably, draining the water in the water seal cavity II includes opening the water release valve II (651) and closing the water inlet valve II (661).

10. The gas switching method according to claim 8, characterized in that: The invention also includes step C, when switching the standby high temperature filter, activating the high temperature filter outlet combined water seal valve system connected to the standby high temperature filter, and performing gas switching according to step A and step B; Preferably, after switching to the standby high-temperature filter, if the original high-temperature filter needs to be regenerated, the combined water seal sealing valve 1 (50) in the high-temperature filter outlet combined water seal sealing valve system connected to the original high-temperature filter is closed to cut off the high-temperature filter outlet pipe (11) and the raw gas pipeline (30), and the combined water seal sealing valve 2 (60) is opened to connect the high-temperature filter outlet pipe (11) and the regeneration or release circulation pipeline (40), and air is introduced for regeneration, so that the gas discharged after regeneration is discharged along the combined water seal sealing valve 2 (60) through the regeneration or release circulation pipeline (40).

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