CN114281121B

CN114281121B - Recovery system of lock bucket gas

Info

Publication number: CN114281121B
Application number: CN202111636160.1A
Authority: CN
Inventors: 张正旺; 周三; 马志超; 方科学; 刘泽龙
Original assignee: ENN Science and Technology Development Co Ltd
Current assignee: ENN Science and Technology Development Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2024-01-30
Anticipated expiration: 2041-12-29
Also published as: CN114281121A

Abstract

The present disclosure relates to a lock hopper gas recovery system, the system comprising: the lock hopper system and the timing control system; the lock hopper system comprises at least one repeating unit; the repeating unit includes a plurality of lock hoppers; the lock hoppers are connected through pipelines and valves; through adjusting the opening and closing of the valve, different lock hoppers can be communicated; each lock hopper executes pressure equalizing and reducing and pressure equalizing and boosting at least twice in each operation period; the run cycle includes a plurality of phases; at any stage, at least one lock hopper is in a pressure equalizing and reducing state, and at least one lock hopper is in a pressure equalizing and pressure increasing state; the time sequence control system is connected with each valve and is used for controlling the opening and closing states of the valves, so that the lock hoppers in the pressure equalizing and reducing states in the stages are communicated with the lock hoppers in the pressure equalizing and increasing states. The recovery rate of the high-pressure gas of the lock hopper can be improved, and the compression power consumption of the whole gas is further reduced.

Description

Recovery system of lock bucket gas

Technical Field

The disclosure relates to the technical field of coal chemical industry, in particular to a lock hopper gas recovery system.

Background

Along with the transformation of the energy structure in China, coal resources are gradually transformed from energy into chemical raw materials, so that the energy attribute of the coal resources is fully utilized, and the utilization efficiency of the whole energy is improved. The coal gasification technology is a core and source in the coal chemical industry, and under the current situation that water resources are increasingly strained, the dry powder gasification technology gradually becomes a mainstream coal gasification technology. In the dry powder gasification technology, the raw material pulverized coal is conveyed pneumatically under pressure and needs to be conveyed by adopting a lock hopper system, but frequent pressurization and depressurization operations are carried out, so that a large amount of gas and energy are consumed. Based on the above, how to improve the recovery rate of the lock hopper high-pressure gas and reduce the whole gas compression power consumption is a problem to be solved urgently at present.

Disclosure of Invention

In order to solve the technical problem, the present disclosure provides a recovery system of lock hopper gas.

The present disclosure provides a lock hopper gas recovery system, the system comprising: the lock hopper system and the timing control system;

the lock hopper system comprises at least one repeating unit; the repeating unit includes a plurality of lock hoppers; the lock hoppers are connected through pipelines and valves; through adjusting the opening and closing of the valve, different lock hoppers can be communicated; each lock hopper executes pressure equalizing and reducing and pressure equalizing and boosting at least twice in each operation period;

The run cycle includes a plurality of phases; at any stage, at least one lock hopper is in a pressure equalizing and reducing state, and at least one lock hopper is in a pressure equalizing and pressure increasing state;

the time sequence control system is connected with each valve and is used for controlling the opening and closing states of the valves, so that the lock hoppers in the pressure equalizing and reducing states in the stages are communicated with the lock hoppers in the pressure equalizing and increasing states.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

according to the technical scheme, through setting each lock hopper to execute pressure equalizing and reducing in each operation period at least twice and pressure equalizing and boosting at least twice, the opening and closing states of the valve are controlled, so that the lock hopper in the pressure equalizing and reducing state in each stage is communicated with the lock hopper in the pressure equalizing and boosting state, the pressure releasing gas of the lock hopper is recovered by essentially utilizing the pressure boosting or pressure reducing requirements of different lock hoppers in the same stage, and the purposes of improving the recovery rate of the high-pressure gas of the lock hopper and reducing the compression power consumption of the whole gas are achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic illustration of a repeating unit in a lock hopper system according to an embodiment of the present disclosure;

FIG. 2 is a timing diagram of control logic suitable for use in FIG. 1;

FIG. 3 is a schematic illustration of a specific structure of another repeating unit in the lock hopper system according to an embodiment of the present disclosure;

FIG. 4 is a timing diagram of control logic suitable for use in FIG. 3.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.

As described in the background art, how to improve the recovery rate of the high-pressure gas of the lock hopper and reduce the compression power consumption of the whole gas is a problem to be solved at present.

For this, the present application provides a lock hopper gas recovery system, the system comprising: the lock hopper system and the timing control system; the lock hopper system comprises at least one repeating unit; the repeating unit comprises a plurality of lock hoppers; the lock hoppers are connected through pipelines and valves; through adjusting the opening and closing of the valve, different lock hoppers can be communicated; each lock bucket executes pressure equalizing and reducing and pressure equalizing and boosting at least twice in each operation period; the run cycle includes a plurality of phases; at any stage, at least one lock hopper is in a pressure equalizing and reducing state, and at least one lock hopper is in a pressure equalizing and pressure increasing state; the time sequence control system is connected with each valve and used for controlling the opening and closing states of the valves, so that the lock hoppers in the pressure equalizing and reducing states in each stage are communicated with the lock hoppers in the pressure equalizing and increasing states.

According to the technical scheme, through setting up each lock bucket to execute at least twice voltage-sharing depressurization and at least twice voltage-sharing pressure-boosting in each operation period, the opening and closing states of the valve are controlled, so that the lock bucket in the voltage-sharing depressurization state in each stage is communicated with the lock bucket in the voltage-sharing pressure-boosting state, the pressure-boosting or pressure-reducing requirements of different lock buckets in the same stage are essentially utilized, the pressure-releasing gas of the lock bucket is recovered, the recovery rate of the high-pressure gas of the lock bucket is improved, and the compression power consumption of the whole gas is reduced.

For ease of understanding, two lock hopper systems are given below by way of example. Wherein the lock hoppers forming the repeating units in the first lock hopper system are all standard lock hoppers. In the second type of lock hopper system, part of the lock hoppers forming the repeating units are standard lock hoppers, and the rest part is auxiliary lock hoppers. The standard lock hopper is a lock hopper capable of containing materials, and the working state of the standard lock hopper comprises final pressure relief, material collection, final pressure increase and material discharging. The auxiliary lock hopper is a lock hopper which cannot contain materials, and the working state of the auxiliary lock hopper does not comprise final pressure relief, material collection, final pressure increase and material discharging. The auxiliary lock hopper may be a separate gas equalization tank, for example.

First kind locks fight system

In a specific embodiment, optionally, the repeating unit includes (2m+4) n lock hoppers, each of which is a standard lock hopper; the working state of each standard lock hopper in each operation period comprises M times of pressure equalizing and reducing, M times of pressure equalizing and boosting, one time of final pressure relief, one time of material receiving, one time of final pressure boosting and one time of material discharging; one run cycle includes 2m+4 phases; in each stage, the standard lock hopper in the N-th pressure equalizing and reducing state is communicated with the standard lock hopper in the M+1-N-th pressure equalizing and pressure increasing state; wherein N, N and M are positive integers, M is more than or equal to 2, N is more than or equal to 1 and less than or equal to M. The essence of this arrangement is to limit the number of lock hoppers in the repeating unit of the lock hopper system. Because in practice, only if the number of the lock hoppers is set properly, the whole system can be ensured to have higher gas recovery rate and higher gas compression power consumption.

It is emphasized here that in practice, a pressure equalizing line can be used in conjunction with a pressure equalizing valve to achieve the penetration of the different lock hoppers. Specifically, if the working state of each standard lock bucket in each operation period comprises M times of pressure equalizing and reducing and M times of pressure equalizing and boosting, M pressure equalizing pipelines are required to be arranged, and each standard lock bucket is connected with the M pressure equalizing pipelines through M pressure equalizing valves. If, at a certain stage, it is assumed that the 1 st standard lock is required to be communicated with the 5 th standard lock, a equalizing pipeline can be selected, and the 1 st standard lock is communicated with the 5 th standard lock by opening an equalizing valve connected between the selected equalizing pipeline and the 1 st standard lock and opening an equalizing valve connected between the selected equalizing pipeline and the 5 th standard lock. If the standard lock hoppers of the plurality of groups need to be communicated at the same stage, the same standard lock hoppers of the plurality of groups need to be communicated can be arranged to be communicated based on the same pressure equalizing pipeline, and different pressure equalizing pipelines are used by different standard lock hoppers needing to be communicated.

Fig. 1 is a schematic diagram of a specific structure of a repeating unit in a lock hopper system according to an embodiment of the disclosure. Referring to fig. 1, the repeating unit includes eight standard lock hoppers, which are lock hoppers a-H in fig. 1. The standard lock bucket comprises a lock bucket body 1 and a pressure detection device 9 connected with the lock bucket body 1.

The pipelines comprise a receiving pipeline 3, a discharging pipeline 4, a final pressurizing pipeline 5, a first pressure equalizing pipeline 6, a second pressure equalizing pipeline 7 and a final pressure relieving pipeline 8; the valves comprise a receiving valve 01, a discharging valve 02, a final pressurizing valve 03, a first equalizing valve 04, a second equalizing valve 05 and a final pressure relief valve 06; each lock bucket body is connected with a receiving pipeline 3 through a receiving valve 01, is connected with a discharging pipeline 4 through a discharging valve 02, is connected with a final pressurizing pipeline 5 through a final pressurizing valve 03, is connected with a first equalizing pipeline 6 through a first equalizing valve 04, is connected with a second equalizing pipeline 7 through a second equalizing valve 05, and is connected with a final pressure releasing pipeline 8 through a final pressure releasing valve 06.

In one operation period, the operation state of each standard lock hopper comprises one pressure equalizing and reducing step, two pressure equalizing and reducing step, final pressure reducing step, material receiving step, one pressure equalizing and boosting step, two pressure equalizing and boosting step, final pressure boosting step and material discharging step; in any stage, the working states of any two standard lock hoppers are different.

The time sequence control system is used for controlling the opening and closing states of the first equalizing valve 04 and the second equalizing valve 05 so that in each stage, the lock hopper body in the one equalizing and pressure reducing state is communicated with the lock hopper body in the two equalizing and pressure increasing states; meanwhile, the lock hopper body in the two pressure equalizing and pressure reducing states is communicated with the lock hopper body in the one pressure equalizing and pressure increasing state.

Further, the timing control system is further configured to: in each stage, controlling the opening and closing state of the material receiving valve 01 to enable the lock hopper in the material receiving state to receive materials; controlling the opening and closing states of the discharging valve 02 to enable the lock hopper in the discharging state to discharge materials; controlling the opening and closing state of the final pressurizing valve 03 to enable the lock hopper in the final pressurizing state to be pressurized finally; and controlling the opening and closing states of the final pressure release valve 06 so as to enable the lock hopper in the final pressure release state to release pressure finally. The essence of the arrangement is that the whole operation period of the bucket locking system is uniformly controlled by using the time sequence control system, and the switching of each stage is realized by controlling the opening and closing states of different valves.

With continued reference to FIG. 1, the standard lock hopper optionally further includes a lock hopper pressure relief filter 2; the lock bucket pressure relief filter 2 is connected to the gas inlet and outlet of the lock bucket body 1, so that the pressure relief gas discharged from the lock bucket body 2 reaches the first pressure equalizing pipeline 6, the second pressure equalizing pipeline 7 or the final pressure relief pipeline 8 after passing through the lock bucket pressure relief filter 3, or the gas flowing through the final pressure equalizing pipeline 5, the first pressure equalizing pipeline 6 or the second pressure equalizing pipeline 7 reaches the lock bucket body 1 after passing through the lock bucket pressure relief filter 2. By arranging the lock hopper pressure release filter 2, solid particles in the lock hopper body 1 can be prevented from entering a valve system in the process that the pressure release gas discharged by the lock hopper body 2 reaches the first pressure equalizing pipeline 6, the second pressure equalizing pipeline 7 or the final pressure release pipeline 8 after passing through the lock hopper pressure release filter 3; in the process that the gas flowing through the final pressure-equalizing pipeline 5, the first pressure-equalizing pipeline 6 or the second pressure-equalizing pipeline 7 reaches the lock hopper body 1 after passing through the lock hopper pressure-releasing filter 2, the pressure-releasing gas is utilized to blow back the lock hopper pressure-releasing filter 2 in the lock hopper in the pressure-equalizing pressure-boosting state, so that the self-cleaning of the system can be realized.

Optionally, the timing control system is further configured to control the opening and closing states of the valves according to the arrival condition of the duration of each stage, so as to switch each stage. The purpose of this is to take time as a judgment condition for performing the switching of the different phases. The phase switching is performed based on time, so that the control logic is simple and easy to realize.

Optionally, the timing control system is further configured to adjust the duration of each stage, so that each lock bucket completes the running task in its state during the duration of any stage. In practice, the operation tasks of the lock hopper at different stages are different, and for example, if the lock hopper is in a material receiving state, the operation tasks are that solid materials in the lock hopper body reach a set material level. If the lock hopper is in a pressure equalizing and reducing state, the operation task is that the air pressure difference between the lock hopper body and the lock hopper body communicated with the lock hopper body is smaller than a preset air pressure value. The essence of this arrangement is to ensure that each lock bucket completes the running task first and then switches stages.

TABLE 1

FIG. 2 is a timing diagram of control logic suitable for use in FIG. 1. Table 1 is a table of the operating conditions of each lock hopper in the same repeating unit during one run cycle under the control logic of fig. 2. The operation of the lock gas recovery system will be described in detail with reference to fig. 1, 2 and table 1.

Since in fig. 1, the material receiving valve 01, the material discharging valve 02, the final pressure equalizing valve 03, the first pressure equalizing valve 04, the second pressure equalizing valve 05 and the final pressure releasing valve 06 are provided for each lock hopper, for convenience of distinction, a-04 is used to refer to a first pressure equalizing valve provided for the lock hopper a on the first pressure equalizing pipe of the lock hopper. Other valve designations and so forth.

Before the recovery system of the lock hopper gas is started, the pressure of each lock hopper needs to be adjusted by a control system and/or a person so that the pressures of the lock hopper bodies are matched with each other, and the recovery system has the starting condition of the time sequence control system. Illustratively, referring to table 1, in a first stage, lock hopper a is in a pressure equalizing and depressurizing state, and thus the pressure of each lock hopper is adjusted by the control system and/or manually, including adjusting the pressure of lock hopper a to conform to the pressure value at the initial time of a pressure equalizing and depressurizing state. In the first stage, the lock hoppers B are in a material receiving state, so that the pressure of each lock hopper is adjusted by a control system and/or manually, and the pressure of the lock hoppers B is adjusted to be in accordance with the pressure value at the initial moment of the material receiving state.

After the timing control system is started, timing control is performed as shown in fig. 2 and table 1. Further, assuming an initial state, the duration of each phase is T.

Since the working modes of the lock hoppers A and H in the same operation state are identical, the difference is that the same operation state is realized in different stages, and the lock hoppers A are taken as an example for the explanation below.

After the time sequence control system is started, the first-stage lock hopper A is in a pressure equalizing and reducing state, and the control system and/or a manual opening A-02 discharging valve discharges materials out of the lock hopper A through the discharging pipeline 4, so that the discharging step is finished, and the pressure value of the lock hopper A is consistent with the pressure value of the initial moment of the pressure equalizing and reducing state.

Starting the time sequence control system, entering the first stage, and enabling the lock hopper A to be in a pressure equalizing and pressure reducing state. The lock hopper A in the pressure equalizing and reducing state and the lock hopper H in the pressure equalizing and pressure increasing state have a through condition. The time sequence control system opens the first equalizing valve A-04 and the first equalizing valve H-04 to enable the lock hopper A to be communicated with the lock hopper H. The pressure release gas in the lock hopper A flows to the lock hopper H through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the first stage.

In the first stage, the operation task of the lock hopper A is that the lock hopper A and the lock hopper H are subjected to pressure equalizing. Specifically, the flag that the equalization of the lock hopper a and the lock hopper H is set is that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting device 9 of the lock hopper a and the pressure value shown by the pressure detecting device 9 of the lock hopper H is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the first phase is preset, and if the end of the duration T0 of the first phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is not satisfied by detection, the timing control system is controlled to adjust the duration of the first phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalizing of the lock hopper A and the lock hopper H is completed. After reaching the time T0+X, the time sequence controller closes the first equalizing valve A-04 and the first equalizing valve H-04, and the lock bucket A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time is not reached at the time T0, waiting is carried out until the time T0 is reached, the time sequence controller closes the first equalizing valve A-04 and the first equalizing valve H-04, and the lock bucket A enters the next stage.

And entering a second stage, wherein the lock hopper A is in a two-pressure equalizing and reducing state. The lock hopper A in the two pressure equalizing and reducing states and the lock hopper B in the one pressure equalizing and pressure increasing state have a through condition. The time sequence control system opens the second equalizing valve A-05 and the second equalizing valve B-05, so that the lock hopper A is communicated with the lock hopper B. The pressure release gas in the lock hopper A flows to the lock hopper B through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the second stage.

And in the second stage, the operation task of the lock hopper A is that the lock hopper A and the lock hopper B are subjected to pressure equalizing. Specifically, the flag indicating that the equalization of lock hopper a and lock hopper B is completed is that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting device 9 of lock hopper a and the pressure value shown by the pressure detecting device 9 of lock hopper B is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the second stage is preset, and if the end of the duration T0 of the second stage is reached, the timing control system is controlled to adjust the duration of the second stage by detecting that the condition "|Δp|" is not satisfied and is less than or equal to the set pressure value ". The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalizing of the lock hopper A and the lock hopper B is completed. After reaching the time T0+X, the time sequence controller closes the second equalizing valve A-05 and the second equalizing valve B-05, and the lock hopper A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time is not reached at the time T0, waiting is carried out until the time T0 is reached, the time sequence controller closes the second equalizing valve A-05 and the second equalizing valve B-05, and the lock bucket A enters the next stage.

And entering a third stage, wherein the lock hopper A is in a final pressure release state. And opening a final pressure relief valve A-06, filtering residual gas in the lock hopper A by a lock hopper pressure relief filter 2, and discharging the filtered gas from the final pressure relief pipeline 8 until the end of the duration time T of the second stage is reached. The final pressure-released gas can be provided with different treatment modes according to the composition of the gas. The inert gas is discharged to the atmosphere, illustratively through a final pressure relief line 8. If flammable/toxic gases are present, they may be sent to the flare system via a final pressure relief line 8. If the content of the combustible gas is higher, the method can be used for tail gas combustion power generation.

And in the third stage, the operation task of the lock hopper A is that the pressure of the lock hopper A is normal pressure. Specifically, the sign of setting the pressure of the lock hopper a to normal pressure is that the pressure value shown by the pressure detecting device 9 of the lock hopper a is equal to or less than 0.2MPa with the differential pressure |Δp| of the upstream equipment or pipeline.

In practice, if the duration t=t0 of the third phase is preset, and if the end of the duration T0 of the third phase is reached, the timing control system is controlled to adjust the duration of the third phase by detecting that the condition of "the pressure of the lock hopper a is normal" is not satisfied. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when the time T0+ X is reached, the pressure of the lock hopper A is normal pressure. And after the time T0 plus X is reached, the time sequence controller closes the final pressure relief valve A-06, and the lock hopper A enters the next stage. If the condition that the pressure of the lock bucket A is normal pressure is detected to be satisfied, waiting is carried out until the time T0 is reached, the time sequence controller closes the final pressure relief valve A-06, and the lock bucket A enters the next stage.

Entering a fourth stage, wherein the lock hopper A is in a material receiving state. And opening a receiving valve A-01, and allowing the material to enter the lock hopper A body through a receiving pipeline 3 until reaching the end of the duration time T of the fourth stage.

And in the fourth stage, the operation task of the lock hopper A is that the solid materials in the lock hopper A reach the set material level.

In practice, if the duration t=t0 of the fourth phase is preset, and if the end of the duration T0 of the fourth phase is reached, the condition that "the solid material in the lock hopper a reaches the set level" is not satisfied by detection, the timing control system is controlled to adjust the duration of the fourth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when the moment T0+ X is reached, the solid material in the lock hopper A reaches the set material level. And after the time T0 plus X is reached, the time sequence controller closes the material receiving valve A-01, and the lock hopper A enters the next stage. If the condition that the solid material in the lock hopper A reaches the set material level is detected to be met, the time is not reached to the time T0, waiting is carried out until the time T0 is reached, the time sequence controller closes the material receiving valve A-01, and the lock hopper A enters the next stage.

And entering a fifth stage, wherein the lock hopper A is in a pressure equalizing and boosting state. The lock hopper A in the pressure equalizing and boosting state and the lock hopper H in the pressure equalizing and reducing state have a through condition. The time sequence control system opens the second equalizing valve A-05 and the second equalizing valve H-05, so that the lock hopper A is communicated with the lock hopper H. The pressure release gas in the lock hopper H flows to the lock hopper A through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the fifth stage.

And in the fifth stage, the operation task of the lock hopper A is that the lock hopper A and the lock hopper H are subjected to pressure equalizing. Specifically, the flag that the equalization of the lock hopper a and the lock hopper H is set is that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting device 9 of the lock hopper a and the pressure value shown by the pressure detecting device 9 of the lock hopper H is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the fifth phase is preset, and if the end of the duration T0 of the fifth phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is not satisfied by detection, the timing control system is controlled to adjust the duration of the fifth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalizing of the lock hopper A and the lock hopper H is completed. And after the time T0+ X is reached, the time sequence controller closes the second equalizing valve A-05 and the second equalizing valve H-05, and the lock bucket A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time is not reached at the time T0, waiting is carried out until the time T0 is reached, the time sequence controller closes the second equalizing valve A-05 and the second equalizing valve H-05, and the lock bucket A enters the next stage.

And entering a sixth stage, wherein the lock hopper A is in a two-pressure equalizing and boosting state. The lock hopper A in the two pressure equalizing and pressure increasing state and the lock hopper B in the one pressure equalizing and pressure reducing state have a through condition. The time sequence control system opens the first equalizing valve A-04 and the first equalizing valve H-04 so that the lock hopper A is communicated with the lock hopper B. The pressure release gas in the lock hopper A flows to the lock hopper B through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the sixth stage.

And in the sixth stage, the operation task of the lock hopper A is that the lock hopper A and the lock hopper B are subjected to pressure equalizing. Specifically, the flag indicating that the equalization of lock hopper a and lock hopper B is completed is that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting device 9 of lock hopper a and the pressure value shown by the pressure detecting device 9 of lock hopper B is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the sixth phase is preset, and if the end of the duration T0 of the sixth phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is detected to be not satisfied, the timing control system is controlled to adjust the duration of the sixth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalizing of the lock hopper A and the lock hopper B is completed. After reaching the time T0+X, the time sequence controller closes the first equalizing valve A-04 and the first equalizing valve H-04, and the lock bucket A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time T0 is not reached, the time sequence controller waits until the time T0 is reached, the first equalizing valve A-04 and the first equalizing valve H-04 are closed, and the lock bucket A enters the next stage.

And entering a seventh stage, wherein the lock hopper A is in a final pressurized state. The final pressurizing valve A-03 is opened, and the high-pressure gas enters the lock hopper A body through the final pressurizing pipeline 5 until reaching the end of the duration time T of the seventh stage. The pressure of the final air-filling source is 1.1-2 times of the highest operating pressure of the lock hopper system.

In the seventh stage, the lock bucket A operates to ensure that the pressure of the lock bucket A is approximately equal to the designated pressure of downstream equipment. Specifically, the flag that sets the pressure of the lock hopper a to be approximately equal to the specified pressure of the downstream apparatus is that the pressure difference between the pressure value shown by the pressure detecting means 9 of the lock hopper a and the pressure value of the downstream apparatus is less than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the seventh stage is preset, and if the end of the duration T0 of the seventh stage is reached, the timing control system is controlled to adjust the duration of the seventh stage by detecting that the condition "the pressure of the lock hopper a is approximately equal to the designated pressure of the downstream device" is not satisfied. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when t0+x is reached, the pressure of lock hopper a is approximately equal to the designated pressure of the downstream equipment. And after the time T0 plus X is reached, the time sequence controller closes the final pressurizing valve A-03, and the lock hopper A enters the next stage. If the condition that the pressure of the lock bucket A is approximately equal to the designated pressure of downstream equipment is detected to be met, the time is not reached at the time T0, waiting is carried out until the time T0 is reached, the time sequence controller closes the final pressure charging valve A-03, and the lock bucket A enters the next stage.

And entering an eighth stage, wherein the lock hopper A is in a discharging state. The discharge valve a-02 is opened and material is fed from the discharge line 4 to the downstream equipment until the end of the duration T of the eighth stage is reached.

And in the eighth stage, the operation task of the lock hopper A is that the solid materials in the lock hopper A reach the set material level.

In practice, if the duration t=t0 of the eighth stage is preset, and if the end of the duration T0 of the eighth stage is reached, the condition that "the solid material in the lock hopper a reaches the set level" is not satisfied by detection, the timing control system is controlled to adjust the duration of the eighth stage. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when the moment T0+ X is reached, the solid material in the lock hopper A reaches the set material level. And after the time T0 plus X is reached, the time sequence controller closes the discharging valve A-02, and the lock hopper A enters the next stage. If the condition that the solid material in the lock hopper A reaches the set material level is detected to be met, the time is not reached at the time T0, the time sequence controller closes the discharging valve A-02 until the time T0 is reached, and the lock hopper A enters the next stage.

Optionally, in the eighth stage, the operational task of the lock hopper a may also be set such that the solid material in the lock hopper a reaches the set level (low level) while the solid material in the downstream equipment reaches the set level (high level).

Second kind lock bucket system

In a specific embodiment, optionally, the repeating unit includes (m+2). N standard lock hoppers and M auxiliary lock hoppers; the working state of each standard lock hopper in each operation period comprises M times of pressure equalizing and reducing, M times of pressure equalizing and boosting, one time of final pressure relief, one time of material receiving, one time of final pressure boosting and one time of material discharging; the working state of each auxiliary lock bucket in each operation period comprises M+2 times of pressure equalizing and reducing and M+2 times of pressure equalizing and boosting; one run cycle includes 2m+4 phases;

in each stage, the standard lock hopper in the pressure equalizing and reducing state is communicated with the auxiliary lock hopper in the pressure equalizing and pressure increasing state; the standard lock hopper in the pressure equalizing and boosting state is communicated with the auxiliary lock hopper in the pressure equalizing and pressure reducing state; n and M are positive integers, M is more than or equal to 2. The essence of this arrangement is to limit the number of lock hoppers in the repeating unit of the lock hopper system. Because in practice, only if the number of the lock hoppers is set properly, the whole system can be ensured to have higher gas recovery rate and higher gas compression power consumption.

It is emphasized here that in practice, a pressure equalizing line can be used in conjunction with a pressure equalizing valve to achieve the penetration of the different lock hoppers. Specifically, if the working state of each standard lock bucket in each operation period comprises M times of pressure equalizing and reducing and M times of pressure equalizing and boosting, M pressure equalizing pipelines are required to be arranged, and each standard lock bucket is connected with the M pressure equalizing pipelines through M pressure equalizing valves. If, at a certain stage, it is assumed that the 1 st standard lock is required to be communicated with the 1 st auxiliary lock, a equalizing valve connected between the selected equalizing valve and the 1 st standard lock is opened, and the 1 st standard lock is communicated with the 1 st auxiliary lock by opening the equalizing valve connected between the selected equalizing valve and the 1 st auxiliary lock. If the plurality of groups of lock hoppers need to be communicated at the same stage, the same group of lock hoppers needing to be communicated can be arranged to be communicated based on the same pressure equalizing pipeline, and different pressure equalizing pipelines are used by different groups of lock hoppers needing to be communicated.

Fig. 3 is a schematic diagram of a specific structure of another repeating unit in the lock hopper system according to the embodiment of the disclosure. Referring to fig. 3, the repeating unit includes six lock hoppers; the six lock hoppers comprise four standard lock hoppers and two auxiliary lock hoppers. The auxiliary lock bucket comprises a first auxiliary lock bucket I and a second auxiliary lock bucket II. The four standard lock hoppers are lock hoppers a-D in fig. 3. The standard lock bucket and the auxiliary lock bucket comprise a lock bucket body 1 and a pressure detection device 9 connected with the lock bucket body 1.

The pipelines comprise a receiving pipeline 3, a discharging pipeline 4, a final pressurizing pipeline 5, a first pressure equalizing pipeline 6, a second pressure equalizing pipeline 7 and a final pressure relieving pipeline 8; the valves comprise a receiving valve 01, a discharging valve 02, a final pressurizing valve 03, a first equalizing valve 04, a second equalizing valve 05 and a final pressure relief valve 06; each standard lock bucket body is connected with a final pressure filling pipeline 5 through a final pressure filling valve 03, is connected with a first auxiliary lock bucket I through a first pressure equalizing valve 04 arranged on a first pressure equalizing pipeline 6, is connected with a second auxiliary lock bucket II through a second pressure equalizing valve 05 arranged on a second pressure equalizing pipeline 7, and is connected with a final pressure releasing pipeline 8 through a final pressure releasing valve 06. The lock hopper body of each standard lock hopper is also connected with a receiving pipeline 3 through a receiving valve 01 and connected with a discharging pipeline 4 through a discharging valve 02.

In one operation period, the operation state of each standard lock hopper comprises one pressure equalizing and reducing step, two pressure equalizing and reducing step, final pressure reducing step, material receiving step, one pressure equalizing and boosting step, two pressure equalizing and boosting step, final pressure boosting step and material discharging step; the operation state of each auxiliary lock hopper comprises pressure equalizing and reducing and pressure equalizing and increasing. In any stage, the working states of any two standard lock hoppers are different, and the running states of the two auxiliary lock hoppers are different.

The time sequence control system is used for controlling the opening and closing states of the first equalizing valve 04 and the second equalizing valve 05 so that the lock hopper in the equalizing and depressurizing state is communicated with the auxiliary lock hopper in the equalizing and depressurizing state, and the lock hopper in the equalizing and depressurizing state is communicated with the auxiliary lock hopper in the equalizing and depressurizing state; or the time sequence control system is used for controlling the opening and closing states of the first equalizing valve and the second equalizing valve so that the lock hopper in the two equalizing and pressure reducing states is communicated with the auxiliary lock hopper in the equalizing and pressure increasing states, and the lock hopper in the two equalizing and pressure increasing states is communicated with the auxiliary lock hopper in the equalizing and pressure reducing states.

With continued reference to fig. 3, the standard lock hopper optionally further includes a lock hopper pressure relief filter 2; the lock bucket pressure relief filter 2 is connected to the gas inlet and outlet of the lock bucket body 1, so that the pressure relief gas discharged from the lock bucket body 2 reaches the first pressure equalizing pipeline 6, the second pressure equalizing pipeline 7 or the final pressure relief pipeline 8 after passing through the lock bucket pressure relief filter 3, or the gas flowing through the final pressure equalizing pipeline 5, the first pressure equalizing pipeline 6 or the second pressure equalizing pipeline 7 reaches the lock bucket body 1 after passing through the lock bucket pressure relief filter 2. By arranging the lock hopper pressure release filter 2, solid particles in the lock hopper body 1 can be prevented from entering a valve system in the process that the pressure release gas discharged by the lock hopper body 2 reaches the first pressure equalizing pipeline 6, the second pressure equalizing pipeline 7 or the final pressure release pipeline 8 after passing through the lock hopper pressure release filter 3; in the process that the gas flowing through the final pressure-equalizing pipeline 5, the first pressure-equalizing pipeline 6 or the second pressure-equalizing pipeline 7 reaches the lock hopper body 1 after passing through the lock hopper pressure-releasing filter 2, the pressure-releasing gas is utilized to blow back the lock hopper pressure-releasing filter 2 in the lock hopper in the pressure-equalizing pressure-boosting state, so that the self-cleaning of the system can be realized.

Optionally, the timing control system is further configured to adjust the duration of each stage, so that each lock bucket completes the running task in its state during the duration of any stage. In practice, the operational tasks of the lock hopper in different stages are different, and for example, if the lock hopper is in a material receiving state, the operational tasks are that solid materials in the lock hopper body reach a set material level. If the lock hopper is in a pressure equalizing and reducing state, the operation task is that the air pressure difference between the lock hopper body and the lock hopper body communicated with the lock hopper body is smaller than a preset air pressure value. The essence of this arrangement is to ensure that each lock bucket completes the running task first and then switches stages.

TABLE 2

FIG. 4 is a timing diagram of control logic suitable for use in FIG. 3. Table 2 shows the operating states of the locks in the same repeating unit during one cycle under the control logic of FIG. 4. The operation of the lock gas recovery system will be described in detail with reference to fig. 3, 4 and 2.

Since in fig. 3, the material receiving valve 01, the material discharging valve 02, the final pressure equalizing valve 03, the first pressure equalizing valve 04, the second pressure equalizing valve 05 and the final pressure releasing valve 06 are provided for each lock hopper, for convenience of distinction, a-04 is used to refer to a first pressure equalizing valve provided for the lock hopper a on the first pressure equalizing pipe of the lock hopper. Other valve designations and so forth.

Before the recovery system of the lock hopper gas is started, the pressure of each lock hopper needs to be adjusted by a control system and/or a person so that the pressures of the lock hopper bodies are matched with each other, and the recovery system has the starting condition of the time sequence control system. Illustratively, referring to table 1, in a first stage, lock hopper a is in a pressure equalizing and depressurizing state, and thus the pressure of each lock hopper is adjusted by the control system and/or manually, including adjusting the pressure of lock hopper a to conform to the pressure value at the initial time of a pressure equalizing and depressurizing state. In the first stage, the lock hoppers B are in a pressure equalizing and boosting state, so that the pressure of each lock hopper is adjusted by a control system and/or manually, and the pressure of the lock hoppers B is adjusted to be consistent with the pressure value at the initial moment of the pressure equalizing and boosting state.

After the timing control system is started, timing control is performed as shown in fig. 3 and table 2. Further, assuming an initial state, the duration of each phase is T.

Because the working modes of the lock hoppers A and D in the same operation state are identical, the difference is that the same operation state is realized in different stages, and the lock hoppers A are taken as an example for illustration. The auxiliary lock hopper can be an independent gas pressure equalizing tank. Therefore, when the lock bucket A is taken as an example for explanation, the auxiliary lock bucket I is denoted by the pressure equalizing tank I, and the auxiliary lock bucket II is denoted by the pressure equalizing tank II.

Starting the time sequence control system, entering the first stage, and enabling the lock hopper A to be in a pressure equalizing and pressure reducing state. The lock hopper A in a pressure equalizing and reducing state and the pressure equalizing tank I in a pressure equalizing and boosting state have a through condition. The time sequence control system opens the first equalizing valve A-04 so that the lock hopper A is communicated with the equalizing tank I. The pressure release gas in the lock hopper A flows to the pressure equalizing tank I through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the first stage.

In the first stage, the operation task of the lock hopper A is that the lock hopper A and the pressure equalizing tank I are in pressure equalizing. Specifically, the setting of the sign of the completion of the equalization of the lock hopper a with the equalization tank i is such that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting means 9 of the lock hopper a and the pressure value shown by the pressure detecting means 9 of the equalization tank i is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the first phase is preset, and if the end of the duration T0 of the first phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is not satisfied by detection, the timing control system is controlled to adjust the duration of the first phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. X takes the value to ensure that when reaching T0+X, the pressure equalization of the lock hopper A and the pressure equalizing tank I is completed. And after the time T0+ X is reached, the time sequence controller closes the first equalizing valve A-04, and the lock hopper A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, waiting is carried out until the time T0 is reached, the time sequence controller closes the first equalizing valve A-04, and the lock bucket A enters the next stage.

And entering a second stage, wherein the lock hopper A is in a two-pressure equalizing and reducing state. The lock hopper A in the two pressure equalizing and reducing states and the pressure equalizing tank II in the pressure equalizing and boosting states have a through condition. The time sequence control system opens the second equalizing valve A-05 to enable the lock hopper A to be communicated with the equalizing tank II. The pressure release gas in the lock hopper A flows to the pressure equalizing tank II through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the second stage.

And in the second stage, the operation task of the lock hopper A is that the lock hopper A and the pressure equalizing tank II are subjected to pressure equalizing. Specifically, the setting of the sign of the completion of the equalization of the lock hopper a and the equalization tank ii is such that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting means 9 of the lock hopper a and the pressure value shown by the pressure detecting means 9 of the equalization tank ii is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the second stage is preset, and if the end of the duration T0 of the second stage is reached, the timing control system is controlled to adjust the duration of the second stage by detecting that the condition "|Δp|" is not satisfied and is less than or equal to the set pressure value ". The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalization of the lock hopper A and the pressure equalization tank II is completed. And after the time T0 plus X is reached, the time sequence controller closes the second equalizing valve A-05, and the lock bucket A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time is not reached at the time T0, the time sequence controller waits until the time T0 is reached, the second equalizing valve A-05 is closed, and the lock hopper A enters the next stage.

And entering a third stage, wherein the lock hopper A is in a final pressure release state. And opening a final pressure relief valve A-06, filtering residual gas in the lock hopper A by a lock hopper pressure relief filter 2, and discharging the filtered gas from the final pressure relief pipeline 8 until the end of the duration time T of the second stage is reached. The final pressure-released gas can be provided with different treatment modes according to the composition of the gas. The inert gas is discharged to the atmosphere, illustratively through a final pressure relief line 8. If flammable/toxic gases are contained, they may be sent to a flare system. If the content of the combustible gas is higher, the method can be used for tail gas combustion power generation.

And in the third stage, the operation task of the lock hopper A is that the pressure of the lock hopper A is normal pressure. Specifically, the sign of setting the pressure of the lock hopper a to normal pressure is a pressure difference |Δp| of 0.2MPa or less of the pressure value shown by the pressure detecting device 9 of the lock hopper a and the pressure value in the upstream equipment or pipeline.

In practice, if the duration t=t0 of the fourth phase is preset, and if the end of the duration T0 of the fourth phase is reached, the condition that "the solid material in the lock hopper a reaches the set level" is not satisfied by detection, the timing control system is controlled to adjust the duration of the fourth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when the moment T0+ X is reached, the solid material in the lock hopper A reaches the set material level. And after the time T0 plus X is reached, the time sequence controller closes the material receiving valve A-01, and the lock hopper A enters the next stage. If the condition that the solid material in the lock hopper A reaches the set material level is detected to be satisfied, the time is not reached at the time T0, the time sequence controller closes the material receiving valve A-01 after waiting until the time T0 is reached, and the lock hopper A enters the next stage.

And entering a fifth stage, wherein the lock hopper A is in a pressure equalizing and boosting state. The lock hopper A in a pressure equalizing and boosting state and the pressure equalizing tank II in a pressure equalizing and reducing state have a through condition. The time sequence control system opens the second equalizing valve A-05 to enable the lock hopper A to be communicated with the equalizing tank II. The pressure release gas in the pressure equalizing tank II flows to the lock hopper A through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the fifth stage.

And in the fifth stage, the operation task of the lock hopper A is that the lock hopper A and the pressure equalizing tank II are subjected to pressure equalizing. Specifically, the setting of the sign of the completion of the equalization of the lock hopper a and the equalization tank ii is such that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting means 9 of the lock hopper a and the pressure value shown by the pressure detecting means 9 of the equalization tank ii is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the fifth phase is preset, and if the end of the duration T0 of the fifth phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is not satisfied by detection, the timing control system is controlled to adjust the duration of the fifth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when reaching T0+X, the pressure equalization of the lock hopper A and the pressure equalization tank II is completed. And after the time T0 plus X is reached, the time sequence controller closes the second equalizing valve A-05, and the lock bucket A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, the time is not reached at the time T0, the time sequence controller waits until the time T0 is reached, the second equalizing valve A-05 is closed, and the lock hopper A enters the next stage.

And entering a sixth stage, wherein the lock hopper A is in a two-pressure equalizing and boosting state. The lock hopper A in the two pressure equalizing and boosting states and the pressure equalizing tank I in the pressure equalizing and reducing state have a through condition. The time sequence control system opens the first equalizing valve A-04 so that the lock hopper A is communicated with the equalizing tank I. The pressure release gas in the lock hopper A flows to the pressure equalizing tank I through the lock hopper pressure release filter 2 until reaching the end of the duration time T of the sixth stage.

And in the sixth stage, the operation task of the lock hopper A is that the lock hopper A and the pressure equalizing tank I are in pressure equalizing. Specifically, the setting of the sign of the completion of the equalization of the lock hopper a with the equalization tank i is such that the absolute value |Δp| of the difference between the pressure value shown by the pressure detecting means 9 of the lock hopper a and the pressure value shown by the pressure detecting means 9 of the equalization tank i is smaller than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the sixth phase is preset, and if the end of the duration T0 of the sixth phase is reached, the condition that "|Δp| is less than or equal to the set pressure value" is detected to be not satisfied, the timing control system is controlled to adjust the duration of the sixth phase. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. X takes the value to ensure that when reaching T0+X, the pressure equalization of the lock hopper A and the pressure equalizing tank I is completed. And after the time T0+ X is reached, the time sequence controller closes the first equalizing valve A-04, and the lock hopper A enters the next stage. If the condition that the ' delta P ' is smaller than or equal to the set pressure value ' is detected to be met, waiting is carried out until the time T0 is reached, the time sequence controller closes the first equalizing valve A-04, and the lock bucket A enters the next stage.

In the seventh stage, the lock bucket A operates to ensure that the pressure of the lock bucket A is approximately equal to the designated pressure of downstream equipment. Specifically, the flag that sets the pressure of the lock hopper a to be approximately equal to the specified pressure of the downstream apparatus is that the pressure value shown by the pressure detecting device 9 of the lock hopper a is less than or equal to the set pressure value. Illustratively, |ΔP|+.0.2 MPa. Alternatively, |ΔP|is less than or equal to 0.05MPa.

In practice, if the duration t=t0 of the seventh stage is preset, and if the end of the duration T0 of the seventh stage is reached, the timing control system is controlled to adjust the duration of the seventh stage by detecting that the condition "the pressure of the lock hopper a is approximately equal to the designated pressure of the downstream device" is not satisfied. The adjustment formula is t=t0+x, where X is the time step in seconds, X may be any number from 1 to 1000, alternatively X is any number from 1 to 100. The value of X needs to ensure that when t0+x is reached, the pressure of lock hopper a is approximately equal to the designated pressure of the downstream equipment. And after the time T0 plus X is reached, the time sequence controller closes the final pressurizing valve A-03, and the lock hopper A enters the next stage. If the condition that the pressure of the lock hopper A is approximately equal to the designated pressure of downstream equipment is detected to be met, the time T0 is not reached, the time sequence controller waits until the time T0 is reached, and then the final pressure charging valve A-03 is closed, so that the lock hopper A enters the next stage.

And entering an eighth stage, wherein the lock hopper A is in a discharging state. The discharge valve 4-a-02 is opened and material is fed from the discharge line 4 to the downstream equipment until the end of the duration T of the eighth stage is reached.

According to the recovery system for the two kinds of lock hopper gases, the lock hoppers are combined, the lock hopper control process is optimized, the pressure release gas of the lock hoppers is recovered in a multistage pressure release mode, the recovery rate of the high-pressure gas of the lock hoppers can be improved, and the overall gas compression power consumption is reduced.

On the basis of the technical scheme, optionally, the standard lock hopper in the lock hopper system is a coal inlet lock hopper for coal gasification or a high-pressure slag discharge lock hopper of a dry slag discharge system. If the standard lock hopper in the lock hopper system is a high-pressure slag discharge lock hopper of the slag discharge system, the material receiving step and the material discharging step need to be interchanged when the time sequence control system controls the lock hopper system. Illustratively, referring to table 2, the discharging is performed after the final pressure relief and the receiving is performed after the final pressure boost.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lock hopper gas recovery system comprising: the lock hopper system and the timing control system;

The time sequence control system is connected with each valve and is used for controlling the opening and closing states of the valves so that the lock hopper in the pressure equalizing and reducing state in each stage is communicated with the lock hopper in the pressure equalizing and increasing state;

the repeating unit comprises (2M+4) n lock hoppers, and each lock hopper is a standard lock hopper;

the working state of each standard lock hopper in each operation period comprises M times of pressure equalizing and reducing, M times of pressure equalizing and boosting, one time of final pressure relief, one time of material receiving, one time of final pressure boosting and one time of material discharging; one of the run cycles comprises 2m+4 phases;

in each stage, the standard lock hopper in the Nth pressure equalizing and reducing state is communicated with the standard lock hopper in the M+1-N pressure equalizing and increasing state; in any stage, the working states of any two standard lock hoppers are different;

wherein N, N and M are positive integers, M is more than or equal to 2, N is more than or equal to 1 and less than or equal to M; and/or the number of the groups of groups,

the repeating unit comprises (M+2). N standard lock hoppers and M auxiliary lock hoppers;

the working state of each standard lock hopper in each operation period comprises M times of pressure equalizing and reducing, M times of pressure equalizing and boosting, one time of final pressure relief, one time of material receiving, one time of final pressure boosting and one time of material discharging; the working state of each auxiliary lock hopper in each operation period comprises M+2 times of pressure equalizing and reducing and M+2 times of pressure equalizing and boosting; one of the run cycles comprises 2m+4 phases;

In each stage, the standard lock hopper in the pressure equalizing and reducing state is communicated with the auxiliary lock hopper in the pressure equalizing and pressure increasing state; the standard lock hopper in the pressure equalizing and boosting state is communicated with the auxiliary lock hopper in the pressure equalizing and pressure reducing state; in any stage, the working states of any two standard lock hoppers are different, and the running states of the two auxiliary lock hoppers are different;

wherein n and M are positive integers, M is more than or equal to 2.

2. The system of claim 1, wherein,

the repeating unit comprises eight standard lock hoppers, and each standard lock hopper comprises a lock hopper body and a pressure detection device connected with the lock hopper body;

the pipeline comprises a receiving pipeline, a discharging pipeline, a final pressurizing pipeline, a first equalizing pipeline, a second equalizing pipeline and a final pressure releasing pipeline; the valve comprises a receiving valve, a discharging valve, a final pressurizing valve, a first equalizing valve, a second equalizing valve and a final pressure relief valve; each lock hopper body is connected with the material collecting pipeline through the material collecting valve, connected with the material discharging pipeline through the material discharging valve, connected with the final pressurizing pipeline through the final pressurizing valve, connected with the first equalizing pipeline through the first equalizing valve, connected with the second equalizing pipeline through the second equalizing valve, and connected with the final pressure releasing pipeline through the final pressure releasing valve;

In one operation period, the operation state of each standard lock hopper comprises one pressure equalizing and reducing step, two pressure equalizing and reducing step, final pressure relief step, material receiving step, one pressure equalizing and boosting step, two pressure equalizing and boosting step, final pressure boosting step and material discharging step;

the time sequence control system is used for controlling the opening and closing states of the first pressure equalizing valve and the second pressure equalizing valve so that in each stage, the lock hopper body in a pressure equalizing and reducing state is communicated with the lock hopper body in a pressure equalizing and boosting state; the lock hopper body in the two pressure equalizing and pressure reducing states is communicated with the lock hopper body in the one pressure equalizing and pressure increasing state.

3. The system of claim 1, wherein,

the repeating unit comprises six lock hoppers; the six lock hoppers comprise four standard lock hoppers and two auxiliary lock hoppers; the auxiliary lock hopper comprises a first auxiliary lock hopper and a second auxiliary lock hopper;

the standard lock hopper and the auxiliary lock hopper comprise a lock hopper body and a pressure detection device connected with the lock hopper body;

the pipeline comprises a receiving pipeline, a discharging pipeline, a final pressurizing pipeline, a first equalizing pipeline, a second equalizing pipeline and a final pressure releasing pipeline; the valve comprises a receiving valve, a discharging valve, a final pressurizing valve, a first equalizing valve, a second equalizing valve and a final pressure relief valve; each standard lock bucket body is connected with the final pressure filling pipeline through the final pressure filling valve, is connected with the first auxiliary lock bucket through the first pressure equalizing valve arranged on the first pressure equalizing pipeline, is connected with the second auxiliary lock bucket through the second pressure equalizing valve arranged on the second pressure equalizing pipeline, is connected with the final pressure releasing pipeline through the final pressure releasing valve, is connected with the material collecting pipeline through the material collecting valve, and is connected with the material discharging pipeline through the material discharging valve;

In one operation period, the operation state of each standard lock hopper unit comprises one pressure equalizing and reducing step, two pressure equalizing and reducing step, final pressure relief step, material receiving step, one pressure equalizing and boosting step, two pressure equalizing and boosting step, final pressure boosting step and material discharging step; the operation state of each auxiliary lock hopper comprises pressure equalizing and reducing and pressure equalizing and increasing;

the time sequence control system is used for controlling the opening and closing states of the first equalizing valve and the second equalizing valve so that the lock hopper in an equalizing and depressurizing state is communicated with the auxiliary lock hopper in an equalizing and depressurizing state, and the lock hopper in an equalizing and depressurizing state is communicated with the auxiliary lock hopper in an equalizing and depressurizing state; or,

the time sequence control system is used for controlling the opening and closing states of the first pressure equalizing valve and the second pressure equalizing valve, so that the lock hopper in the two pressure equalizing and pressure reducing states is communicated with the auxiliary lock hopper in the pressure equalizing and pressure increasing state, and the lock hopper in the two pressure equalizing and pressure increasing states is communicated with the auxiliary lock hopper in the pressure equalizing and pressure reducing state.

4. A system as claimed in claim 2 or 3, wherein the timing control system is further adapted to: controlling the opening and closing states of the material receiving valve at each stage so as to enable the lock hopper in the material receiving state to receive materials; controlling the opening and closing state of the discharging valve to enable the lock hopper in the discharging state to discharge materials; controlling the opening and closing state of the final pressurizing valve to enable the lock hopper in the final pressurizing state to be pressurized finally; and controlling the opening and closing states of the final pressure relief valve so as to enable the lock hopper in the final pressure relief state to relieve pressure finally.

5. The system of claim 2 or 3, wherein,

the standard lock hopper also comprises a lock hopper pressure release filter; the lock bucket pressure relief filter is connected to the gas inlet and outlet of the lock bucket body, so that the pressure relief gas exhausted from the lock bucket body passes through the lock bucket pressure relief filter and then reaches the first pressure equalizing pipeline, the second pressure equalizing pipeline or the final pressure relief pipeline, or the gas flowing through the final pressure equalizing pipeline, the first pressure equalizing pipeline or the second pressure equalizing pipeline passes through the lock bucket pressure relief filter and then reaches the lock bucket body.

6. The system of claim 1, wherein,

the time sequence control system is also used for controlling the opening and closing states of the valves according to the arrival condition of the duration time of each stage so as to switch each stage.

7. The system of claim 6, wherein,

the time sequence control system is also used for adjusting the duration time of each stage so that each lock hopper can complete the running task of the state of the lock hopper in the duration time of any stage.

8. The system of claim 1, wherein the standard lock in the lock system is a coal feed lock for coal gasification or a high pressure slag lock for dry slag removal.