CN113250735A

CN113250735A - Gas safe mixing system and method matched with gas oxidation device

Info

Publication number: CN113250735A
Application number: CN202110400979.1A
Authority: CN
Inventors: 贾洛阳; 李和平; 杨少波
Original assignee: Shandong Yangde Technology Co ltd
Current assignee: Shandong Yangde Technology Co ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-08-13

Abstract

The application relates to a gas safe mixing system and method matched with a gas oxidation device, and belongs to the field of coal mine gas utilization engineering. The gas safe mixing system comprises a high-concentration gas safe conveying part, a low-concentration gas safe conveying part, a high-concentration gas and low-concentration gas primary mixing part, a gas secondary mixing part and a control module; and the control module is integrated in the gas safety blending system and is used for respectively collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and the low-concentration gas secondary blending part and/or controlling the corresponding regulating device. This application can provide the mixing gas that satisfies the requirement for gas oxidation device safely and stably, has avoided the accident of gas oxidation device overtemperature explosion that causes because of the gas concentration of admitting air transfinites, has also avoided the problem that the oxidation efficiency is low because of the gas oxidation device that the gas pure quantity is not enough and lead to simultaneously.

Description

Gas safe mixing system and method matched with gas oxidation device

Technical Field

The application relates to the field of coal mine gas utilization engineering, in particular to a gas safety mixing system and method matched with a gas oxidation device.

Background

According to statistics, the extracted gas is about 136 billion cubic meters every year in China. In the gas discharged from coal mines, the high-concentration gas with the CH4 concentration of more than 30 percent accounts for about 5 percent of the total amount, and is mainly used as civil gas, industrial gas boilers and gas power generation at present; the gas with the CH4 concentration of 8-30% accounts for about 11% of the total amount, and a low-concentration gas generator set is mainly adopted for power generation; the low-concentration gas with the CH4 concentration less than 8 percent accounts for more than 80 percent of the total gas amount, the low-concentration gas contains high CH4 amount although the concentration is low, and because the methane with the concentration is influenced by various factors such as the coal bed gas content in a mine, the coal mining amount, the ventilation quantity and the like, the low-concentration gas has the characteristics of being lower than the traditional combustion limit, difficult to enrich, large in concentration fluctuation range and the like, and is difficult to utilize by utilizing a traditional combustion method. Two sets of gas extraction systems are generally built in a high-gas mine, wherein the gas extracted by one system is higher in concentration, and the gas extracted by the other system is lower in concentration. The gas oxidation device has the advantages that ultra-low concentration gas can be utilized, and the lower limit value of the gas concentration application reaches 0.35%. For the gas with the CH4 concentration less than 8%, the gas and air (or ventilation air) can be mixed to a lower concentration and then sent into a gas oxidation device for oxidation and utilization, a gas safety mixing system matched with the gas oxidation device ensures that the gas with the lower concentration is used as much as possible, and part of the gas with the higher concentration is mixed under the condition of insufficient gas purity, so that the existing resources can be fully utilized, and the energy conservation and emission reduction are realized.

In order to ensure the safe operation of the gas oxidation device, the concentration of the gas entering the oxidation bed is required to be far lower than the explosion limit of the gas, the concentration of methane is generally controlled to be less than 1.2%, and the local over-concentration phenomenon cannot occur (after the concentration of the gas is too high, the risk of explosion of the oxidation device and a gas conveying pipeline exists); for the gas drainage station end, the phenomenon of pump holding-down of a drainage pump caused by the fact that a gas conveying pipeline cannot be overpressurized is required, the safety problem of the gas oxidation device end cannot be transmitted to the gas drainage station end, and the underground safety accident caused by improper utilization of gas is avoided. Therefore, strict requirements are provided for the safety transmission of high and low negative pressure gas extraction and the safety and reliability of a mixing system. Therefore, when the gas oxidation technology is used for utilizing gas, how to reasonably design a gas safe mixing system is the key for ensuring the safe operation of the coal mine gas extraction system and the gas oxidation device.

Disclosure of Invention

The gas mixing system mainly comprises a gas mixing device, a gas conveying pipeline, a gas mixing device, a gas mixing system and a gas mixing device, wherein the gas mixing system comprises a gas mixing device, a gas outlet pipe and a gas outlet pipe.

In order to achieve the above object, the present application adopts a technical solution that: the high-concentration gas safety conveying part is connected to the positive pressure end of a gas drainage station and used for adjusting the flow of high-concentration gas and conveying the high-concentration gas according to a gas control instruction of the control module; the low-concentration gas safety conveying part is connected to the other positive pressure end of the gas drainage station and used for adjusting the flow of the low-concentration gas according to a gas control instruction of the control module and conveying the low-concentration gas; the high-concentration gas and low-concentration gas primary mixing part is connected with the rear end of the high-concentration gas safe conveying part and the rear end of the low-concentration gas safe conveying part respectively and is used for fully mixing high-concentration gas and low-concentration gas to obtain primary mixed gas; the gas secondary mixing part is connected to the rear end of the high-concentration gas primary mixing part and the low-concentration gas primary mixing part and is used for carrying out secondary mixing on the primary mixed gas, air and regenerative flue gas to obtain secondary mixed gas, and conveying the secondary mixed gas to a gas oxidation device; and the control module is integrated in the gas safety blending system and is used for respectively collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and the low-concentration gas primary blending part and/or the gas secondary blending part and controlling corresponding adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and/or the gas secondary blending part, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, and the adjusting devices comprise valves and/or fans.

Another technical scheme adopted by the application is as follows: the method comprises a gas safety conveying step, wherein high-concentration gas output by a positive pressure end of a gas drainage station is conveyed to a high-low concentration gas primary mixing part through a high-concentration gas safety conveying part, and low-concentration gas output by the positive pressure end of the gas drainage station is conveyed to the high-low concentration gas primary mixing part through a low-concentration gas safety conveying part; a first gas mixing step, namely uniformly mixing high-concentration gas and low-concentration gas in the first high-concentration gas and low-concentration gas mixing part to obtain first mixed gas; a gas secondary mixing step, wherein the gas secondary mixing part carries out secondary mixing on the primary mixed gas, air and regenerative flue gas through negative pressure generated by a main fan to obtain secondary mixed gas; and a control step, wherein the control module is used for collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part, and adjusting corresponding adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part according to the size relation between the monitoring parameters and corresponding preset parameters, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, the preset parameters comprise pressure threshold values, instantaneous pure quantity threshold values, gas concentration threshold values, flow threshold values and/or temperature threshold values, and the adjusting devices comprise valves and/or fans.

The technical scheme of the application can reach the beneficial effects that: the application designs a gas safety mixing system matched with a gas oxidation device. This gas safety blending system passes through the flowmeter of different positions of control module collection analysis, concentration analysis appearance and according to each adjusting device of analysis result control in order to realize the gas concentration, the quantitative even control of gas flow and gas pure quantity, thereby realize gas concentration automatic control, can provide the blending gas that satisfies the requirement for gas oxidation device safely and stably, the accident of the gas oxidation device overtemperature explosion that has avoided leading to because of the gas concentration transfinites that admits air, the problem of the oxidation efficiency low of the gas oxidation device that has also avoided leading to because of the gas pure quantity is not enough simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of one embodiment of a gas safety blending system for use with a gas oxidation unit according to the present application;

FIG. 2 is a process diagram of a gas safety blending system associated with a gas oxidation unit in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of the internal structure of a double-tank water-seal flame arrester in the embodiment of the application;

FIG. 4 is a schematic view showing the internal structure of a dehydrator in an embodiment of the present application;

FIG. 5 is a sectional view of the multi-stage air-gas-flue gas mixer in the embodiment of the present application;

FIG. 6 is a schematic view of an embodiment of a method for safely blending gas according to the present application.

Wherein the reference numerals in fig. 2 to 5 are as follows: 1. a high-concentration gas safe conveying part, a low-concentration gas safe conveying part, a 3 high-concentration gas and low-concentration gas primary mixing part, a 4 gas secondary mixing part, 101 a first soft sealing manual butterfly valve, 102 a first in-situ laser concentration analyzer, 103 a first online wet type diffusion valve, 104 a first dry type flame arrester, 105 a first diffusion pipe, 106 a first pneumatic diffusion regulating valve, 107 a first double-tank type water seal flame arrester, 108 a first dehydrator, 109 a first pressure sensor, 110 a first flow meter, 111 a first pneumatic single-action emergency cut-off valve, 112 a high-concentration gas flow regulating valve, 113 a second soft sealing manual butterfly valve, 201 a third soft sealing manual butterfly valve, 202 a second online wet type diffusion valve, 203 a second dry type flame arrester, 204 a second diffusion pipe, 205 and a second pneumatic diffusion regulating valve, 206. a second double-tank water-seal flame arrester, 207, a C-type filter, 208, a third dry flame arrester, 209, a second pressure sensor, 210, a second pneumatic single-action emergency cut-off valve, 211, a fine water mist generator, 212, a water mist pressure sensor, 213, a second dehydrator, 301, a static mixer, 302, a second in-situ laser concentration analyzer, 303, a first flowmeter, 304, a third pressure sensor, 305, a blending gas flow regulating valve, 306, a first temperature sensor, 401, a regenerative flue gas flow regulating valve, 402, a multi-stage air gas mixer, 403, a primary air inlet regulating valve, 404, a second temperature sensor, 405, a No. 1 in-situ laser concentration analyzer, 406, a No. 2 in-situ laser concentration analyzer, 407, a removable laser concentration analyzer, 408, a third flowmeter, 409, a main air inlet switch valve, 410, a first pressure sensor, a second pneumatic single-action emergency cut-off valve, a fine water mist generator, 212, a water mist pressure sensor, 213, a second dehydrator, 301, a static mixer, a second in-gas inlet regulating valve, a second temperature sensor, a, The main fan, 411, a fresh air valve, 412, a blowing fan switch valve, 413, a blowing fan, 414, a third temperature sensor, 4021, a mixing chamber component, 4022, a mixing chamber component, 4023, a riser component, 4024, a secondary air inlet component, 4025, a primary air inlet adjusting component, a mixing chamber, b, the inner cavity of the mixing chamber component is a mixing chamber, c, a primary air inlet chamber, d, a regenerative flue gas inlet chamber, e, an adjustable disc plate, I, a gas inlet, II, a mixer air outlet, III, a primary air inlet, IV, a regenerative flue gas inlet, V, a first opening in the riser component, VI, a second opening in the secondary air inlet component, VII, a third opening in the primary air inlet chamber, VIII, a fourth opening in the regenerative flue gas inlet chamber, 1071, a first chamber, 1071a, a mounting flange, 1072, a second chamber, 1072a, The double-tank type water seal fire arrestor comprises a wire mesh demister in a double-tank type water seal fire arrestor 1081, a wire mesh demister in a dehydrator, 1082a, a first guide plate inside the dehydrator, 1082b, a second guide plate, 1082c and a third guide plate.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a better understanding of the advantages and features of the present application, and will make the scope of the present application more clear and definite.

It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 illustrates one embodiment of a gas safety blending system configured with a gas oxidizer of the present application.

In a specific embodiment of the application, a gas safety blending system matched with a gas oxidation device mainly comprises a high-concentration gas safety conveying part, a low-concentration gas safety conveying part, a high-concentration gas and low-concentration gas primary blending part, a gas secondary blending part and a control module, wherein the high-concentration gas safety conveying part is connected to a positive pressure end of a gas drainage station and is used for adjusting the flow of high-concentration gas according to a gas control instruction of the control module and conveying the high-concentration gas; the low-concentration gas safety conveying part is connected to the other positive pressure end of the gas drainage station and used for adjusting the flow of the low-concentration gas according to a gas control instruction of the control module and conveying the low-concentration gas; the high-concentration gas and low-concentration gas primary mixing part is connected with the rear end of the high-concentration gas safe conveying part and the rear end of the low-concentration gas safe conveying part respectively and is used for fully mixing high-concentration gas and low-concentration gas to obtain primary mixed gas; the gas secondary mixing part is connected to the rear end of the high-concentration gas primary mixing part and the low-concentration gas primary mixing part and is used for carrying out secondary mixing on the primary mixed gas, air and regenerative flue gas to obtain secondary mixed gas, and conveying the secondary mixed gas to a gas oxidation device; and the control module is integrated in the gas safety blending system and is used for respectively collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and the low-concentration gas primary blending part and/or the gas secondary blending part and controlling corresponding adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and/or the gas secondary blending part, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, and the adjusting devices comprise valves and/or fans.

In this embodiment, as shown in fig. 1, the high-concentration gas safety conveying part and the low-concentration gas safety conveying part are respectively connected with the high-concentration gas primary blending part and the low-concentration gas primary blending part, the high-concentration gas reaches the high-concentration gas primary blending part through the high-concentration gas safety conveying part, the low-concentration gas reaches the high-concentration gas primary blending part through the low-concentration gas safety conveying part, and the primary blending gas in the high-concentration gas primary blending part directly reaches the gas secondary blending part to be secondarily blended with air and regenerative flue gas, so as to ensure that the required blending gas is provided for the gas oxidation device. Control module control high concentration gas safety transport part, low concentration gas safety transport part, these four parts of mixing part and gas secondary mixing part are once mixed to high low concentration gas, control module is through the monitoring parameter who gathers and analyze these four parts, adjust the adjusting device that these four parts correspond, can be when the gas pure quantity is not enough, control module adjusts the adjusting device that corresponds and carries high concentration gas to the mixing part of high low concentration gas once, guarantee the gas pure quantity, in order to realize the quantitative control to gas concentration and gas flow. This gas safety blending system can provide the blending gas that satisfies the requirement for gas oxidation device safely and stably, avoids because of gas inlet concentration overruns accidents such as gas oxidation device overtemperature explosion that cause, has also ensured the safety of gas drainage station simultaneously.

Fig. 2 is a process diagram of a gas safety blending system associated with a gas oxidation device according to an embodiment of the present application.

In the specific example shown in fig. 2, the gas safety blending system matched with the gas oxidation device comprises a high-concentration gas safety conveying part 1 for conveying high-concentration gas to a high-concentration gas primary blending part 3, a low-concentration gas safety conveying part 2 for conveying low-concentration gas to the high-concentration gas primary blending part 3, the high-concentration gas primary blending part 3 fully blends the high-concentration gas and the low-concentration gas to obtain primary blended gas, the primary blended gas is conveyed to a gas secondary blending part 4, the gas secondary blending part 4 fully blends the primary blended gas, air and regenerative flue gas for the second time, and the secondary blended gas meeting the standard concentration range is conveyed to the gas oxidation device for oxidation and utilization, so that the existing resources can be fully utilized, and energy conservation and emission reduction can be realized.

In this embodiment, as shown in fig. 2, the control module collects and analyzes monitoring parameters of the high-concentration gas safety conveying part 1, the low-concentration gas safety conveying part 2, the high-concentration and low-concentration gas primary blending part 3 and the gas secondary blending part 4, respectively, and controls adjusting devices corresponding to the high-concentration gas safety conveying part 1, the low-concentration gas safety conveying part 2, the high-concentration and low-concentration gas primary blending part 3 and the gas secondary blending part 4 according to the gas concentration requirement of the gas oxidation device, wherein the monitoring parameters include a pressure measurement value, an instantaneous pure value, a gas concentration measurement value, a flow measurement value and/or a temperature measurement value, and the adjusting devices include valves and/or fans of the above parts. The gas concentration measurement value in the monitoring parameters is obtained by detecting each concentration analyzer on the gas conveying pipeline, the flow measurement value is obtained by detecting each flow meter on the gas conveying pipeline, the pressure measurement value is obtained by detecting each pressure sensor on the gas conveying pipeline, and the temperature measurement value is obtained by detecting each temperature sensor on the gas conveying pipeline; the adjusting device comprises a high-concentration gas safe conveying part 1, a low-concentration gas safe conveying part 2, valves of a high-concentration gas primary mixing part 3 and/or a gas secondary mixing part 4 and/or fans, wherein the number of the fans is not less than two in figure 2. The opening size of each valve that each valve passes through control module's control command automatically regulated corresponds valve can realize the quantitative mixing to gas concentration, and control gas flow guarantees the gas pure quantity, and safety and stability provides the gas concentration that satisfies the requirement for gas oxidation device.

In a specific embodiment of the application, a first in-situ laser concentration analyzer is arranged on a first conveying pipeline of the high-concentration gas safe conveying part, is positioned at the front end of the first conveying pipeline, and is used for detecting the gas concentration of the high-concentration gas safe conveying part and feeding back the gas concentration to a control module, wherein the detection response time of the first in-situ laser concentration analyzer is not greater than a first preset time threshold; the first online wet-type bleeding valve is positioned at the rear end of the first in-situ laser concentration analyzer, and the upper end of the first online wet-type bleeding valve is sequentially provided with a first dry-type flame arrester and a first bleeding pipe which are used for discharging gas of a high-concentration gas safety conveying part and performing overpressure protection on a gas safety mixing system; the first double-tank water-seal flame arrester is positioned at the rear end of the first online wet-type diffusion valve, a flange at the upper end of the first double-tank water-seal flame arrester is provided with a first pneumatic diffusion regulating valve, and the first pneumatic diffusion regulating valve is connected to the lower end of the first dry-type flame arrester and is used for automatically regulating the opening of the first pneumatic diffusion regulating valve according to a pressure control instruction of the control module so as to regulate the pressure of a first conveying pipeline; the first dehydrator is positioned at the rear end of the first double-tank water-seal flame arrester and is used for dehydrating high-concentration gas; the first pressure sensor is positioned at the rear end of the first dehydrator and used for detecting the pressure in the first conveying pipeline and feeding back the pressure to the control module; the first flowmeter is positioned at the rear end of the first pressure sensor and used for detecting the gas flow of the high-concentration gas safe conveying part and feeding back the gas flow to the control module; the first pneumatic single-action emergency cut-off valve is positioned at the rear end of the first flowmeter and used for cutting off the gas conveying of the high-concentration gas safety conveying part according to an emergency cut-off instruction of the control module, wherein the time from an open position to a closed position of the first pneumatic single-action emergency cut-off valve is not more than a second preset time threshold, and the first pneumatic single-action emergency cut-off valve has the function of automatically closing off power or compressed air; and the high-concentration gas flow regulating valve is positioned at the rear end of the first pneumatic single-action emergency cut-off valve and used for automatically regulating the opening size of the high-concentration gas flow regulating valve according to a gas control instruction and controlling the flow of high-concentration gas.

In this embodiment, the first pipeline of the high-concentration gas safety conveying part comprises a first in-situ laser concentration analyzer, a first online wet-type diffusion valve, a first dry-type flame arrester, a first diffusion pipe, a first pneumatic diffusion regulating valve, a first double-tank water-seal flame arrester, a first dehydrator, a first pressure sensor, a first flowmeter, a first pneumatic single-action emergency cut-off valve and a first high-concentration gas flow regulating valve. Wherein the detection response time of the first in-situ laser concentration analyzer is not more than a first preset time threshold; the first diffusion pipe is arranged on the first online wet-type diffusion valve, and a first dry-type flame arrester is arranged on the first diffusion pipe close to the outlet side; the first pneumatic diffusion regulating valve is arranged on a flange at the upper end of a first chamber of the first double-tank water-seal flame arrester, and the gas outlet of the first pneumatic diffusion regulating valve is connected with a first diffusion pipe; the time from the open position to the closed position of the first pneumatic single-action emergency cut-off valve is not more than a second preset time threshold value, and the automatic cut-off valve has the function of automatically closing the compressed air when the power is cut off. Preferably, the first preset time threshold is 1 second, and the second preset time threshold is 1.5 seconds.

In an embodiment of the present application, the first pipeline of the high-concentration gas safety conveying part is further provided with a plurality of soft-sealing manual butterfly valves, which are respectively arranged at the front end of the first in-situ laser concentration analyzer and/or at the rear end of the high-concentration gas flow regulating valve, and are used as manual protection valves for manually controlling the opening and closing of the high-concentration gas safety conveying part.

In this embodiment, in order to ensure that the gas safety mixing system preferentially supplies low-concentration gas and ensure the safety of the gas safety mixing system, a plurality of soft-sealing manual butterfly valves are arranged on the first conveying pipeline of the high-concentration gas safety conveying part, the soft-sealing manual butterfly valves can be respectively arranged at the front end of the first in-situ laser concentration analyzer and the rear end of the high-concentration gas flow regulating valve, and can also be only arranged at the rear end of the high-concentration gas flow regulating valve, so that the high-concentration gas in the first conveying pipeline can not enter the high-concentration gas primary mixing part and the low-concentration gas primary mixing part under the condition that the high-concentration gas is not needed. In the process diagram shown in fig. 2, a first soft sealing manual butterfly valve 101 is disposed at the front end of the first in-situ laser concentration analyzer 102 to ensure that the high-concentration gas safe delivery part starts to operate, and a second soft sealing manual butterfly valve 113 is disposed at the rear end of the high-concentration gas flow regulating valve 112 to prevent low-concentration gas from flowing back into the high-concentration gas delivery pipe and related equipment when high-concentration gas is not used.

In a specific example of the present application, as shown in fig. 2, the monitoring device in the high-concentration gas safe conveying part 1 mainly includes a first in-situ laser concentration analyzer 102, a first flowmeter 110 and a high-concentration gas flow regulating valve 112, and is mainly used for controlling high-concentration gas, the control module analyzes gas concentration and gas flow by collecting, and when the gas purity is low, the control module sends out a gas control instruction, and increases the opening degree of the high-concentration gas flow regulating valve 112, so that the gas flow is increased, and the gas purity is increased.

In a specific embodiment of the application, a second online wet-type bleeding valve is arranged on a second conveying pipeline of the low-concentration gas safe conveying part, is positioned at the front end of the second conveying pipeline, and is sequentially provided with a second dry-type flame arrester and a second bleeding pipe at the upper end of the second conveying pipeline, and is used for discharging gas of the low-concentration gas safe conveying part to perform overpressure protection on a gas safe blending system; the second double-tank water-seal flame arrester is positioned at the rear end of the second online wet-type diffusion valve, a second pneumatic diffusion regulating valve is arranged on a flange at the upper end of the second online wet-type diffusion valve and connected to the lower end of the second dry-type flame arrester, and the second pneumatic diffusion regulating valve is used for automatically regulating the opening of the second pneumatic diffusion regulating valve according to a pressure control instruction of the control module so as to regulate the pressure of a second conveying pipeline; the C-type filter is positioned at the rear end of the second double-tank water-sealing flame arrester and is used for filtering impurities in low-concentration gas; a third dry flame arrestor at the rear end of the C-type filter for preventing flame from entering the second transfer duct or spreading between the second transfer ducts; the second pressure sensor is positioned at the rear end of the second double-tank water seal flame arrester and used for detecting the pressure in the second conveying pipeline and feeding the pressure back to the control module; the second pneumatic single-action emergency cut-off valve is positioned at the rear end of the second pressure sensor and used for cutting off the gas conveying of the low-concentration gas safety conveying part according to an emergency cut-off instruction of the control module, wherein the time from the open position to the closed position of the second pneumatic single-action emergency cut-off valve is not more than a second preset time threshold value, and the second pneumatic single-action emergency cut-off valve has the function of automatically closing off when power is cut off or compressed air is cut off; the fine water mist generator is positioned at the rear end of the second pneumatic single-action emergency cut-off valve, and the upper end of the fine water mist generator is provided with a water mist pressure sensor which is used for protecting the delivery of low-concentration gas; and the second dehydrator is positioned at the rear end of the fine water mist generator and is used for dehydrating the low-concentration gas.

In this embodiment, the second pipeline of the low-concentration gas safe conveying part comprises a second online wet-type bleeding valve, a second dry-type flame arrester, a second bleeding pipe, a second pneumatic bleeding regulating valve, a second double-tank water-seal flame arrester, a C-type filter, a third dry-type flame arrester, a second pressure sensor, a second pneumatic single-action emergency cut-off valve, a fine water mist generator, a water mist pressure sensor and a second dehydrator. The second diffusion pipe is arranged on the second online wet diffusion valve, and a second dry flame arrester is arranged on the second diffusion pipe close to the outlet side; the second pneumatic diffusion regulating valve is arranged on a flange at the upper end of the first chamber of the second double-tank water-seal flame arrester, and the air outlet of the second pneumatic diffusion regulating valve is connected with a second diffusion pipe; the time from the open position to the closed position of the second pneumatic single-action emergency cut-off valve is not more than a second preset time threshold value, preferably, the second preset time threshold value is 1.5 seconds, and the second pneumatic single-action emergency cut-off valve has the function of automatically closing compressed air when power is off. In the process diagram shown in fig. 2, a third soft-sealing manual butterfly valve 201 may be further included on the second delivery pipe of the low-concentration gas safety delivery part 2, as a manual protection valve when the low-concentration gas safety delivery part 2 starts to operate.

In one specific example of the present application, as shown in fig. 2, the first pneumatic diffusion regulating valve 106 in the high-concentration gas safety conveying section 1 and the second pneumatic diffusion regulating valve 205 in the low-concentration gas safety conveying section 2 have a function of regulating the line pressure. When the control module sends a pressure control instruction that the pressure is too high, the opening degree of the corresponding first pneumatic diffusion regulating valve 106 and/or second pneumatic diffusion regulating valve 205 is increased, and the pipeline pressure is properly reduced; when the control module sends the pressure control command that the pressure is too small, the opening degree of the corresponding first pneumatic bleeding regulating valve 106 and/or second pneumatic bleeding regulating valve 205 is reduced to reduce bleeding and improve and stabilize the target pressure. The first pneumatic single-acting quick action emergency cut valve 111 in the high-concentration gas safety conveying portion 1 and the second pneumatic single-acting quick action emergency cut valve 210 in the low-concentration gas safety conveying portion 2 have a function of quickly cutting off the gas source. When the emergency cut-off instruction sent by the control module is safety problems such as overlarge gas concentration and overhigh temperature, the control module closes the first pneumatic single-action emergency cut-off valve 111 and the second pneumatic single-action emergency cut-off valve 210, and the gas source can be cut off emergently because the time from the open position to the closed position is not more than 1.5 s. In the inside schematic diagram of two pot-type water seal flame arrestors shown in fig. 3, the upper end in the first two pot-type water seal flame arrestor 107 in the high concentration gas safety conveying part 1 and the first chamber 1071 in the second two pot-type water seal flame arrestor 206 in the low concentration gas safety conveying part 2 is provided with a mounting flange 1071a, the pneumatic diffusion regulating valve is connected with the mounting flange 1071a, the upper end in the second chamber 1072 is provided with a wire mesh demister 1072a, and water foam in high concentration gas and low concentration gas can be filtered. In the schematic internal view of the dehydrator shown in fig. 4, three sets of wire mesh defoamers 1081 are arranged inside the first dehydrator 108 in the high-concentration gas safety conveying part 1 and the second dehydrator 213 in the low-concentration gas safety conveying part 2, so that water foam in high-concentration gas and low-concentration gas can be filtered; in order to save space, three groups of guide plates, namely a first guide plate 1082a, a second guide plate 1082b and a third guide plate 1082c, are arranged in the dehydrator, so that the three groups of wire mesh defoamers can be arranged along the airflow direction, and the gas conveying speed is reduced in a limited space.

In a specific embodiment of the present application, a static mixer is disposed on the third conveying pipeline of the primary high-low concentration gas blending part, and is located at the front end of the third conveying pipeline, and is used for mixing the input high-concentration gas and the input low-concentration gas; the second in-situ laser concentration analyzer is positioned at the rear end of the static mixer and used for detecting the gas concentration of the primary mixing part of the high-concentration gas and the low-concentration gas and feeding back the gas concentration to the control module, wherein the distance between the second in-situ laser concentration analyzer and the static mixer is not less than a first preset distance threshold value; the second flowmeter is positioned at the rear end of the second in-situ laser concentration analyzer and used for detecting the gas flow of the primary mixing part of the high-concentration gas and the low-concentration gas and feeding back the gas flow to the control module; the third pressure sensor is positioned at the rear end of the second flowmeter and used for detecting the pressure in the third conveying pipeline and feeding back the pressure to the control module; the blending gas flow regulating valve is positioned at the rear end of the third pressure sensor and used for automatically regulating the opening degree of the blending gas flow regulating valve according to a gas control instruction of the control module and controlling the gas flow conveyed to the gas secondary blending part from the high-concentration gas primary blending part and the low-concentration gas secondary blending part; and the first temperature sensor is positioned at the rear end of the mixing gas flow regulating valve and used for detecting the temperature in the third conveying pipeline and feeding back the temperature to the control module.

In the embodiment, the third conveying pipeline of the high-low concentration gas primary mixing part comprises a static mixer, a second in-situ laser concentration analyzer, a second flowmeter, a third pressure sensor, a mixing gas flow regulating valve and a first temperature sensor. The second in-situ laser concentration analyzer is installed at the rear end of the static mixer and is not smaller than a first preset distance threshold value, preferably, the first preset distance threshold value is 3 times of the pipe diameter of the third conveying pipeline, and the specific first preset distance threshold value is determined according to the pipe diameter of the third conveying pipeline.

In one embodiment of the present application, as shown in fig. 2, the static mixer 301 may comprise a plurality of types, which may be SV type, which may be used for blending high concentration gas and low concentration gas with a radial mixing effect with good mixing.

In a specific example of the present application, as shown in fig. 2, the first pressure sensor 109 in the high-concentration gas safety conveying section 1, the second pressure sensor 209 in the low-concentration gas safety conveying section 2, and the third pressure sensor 304 in the high-low concentration gas primary blending section 3 have a function of detecting a line pressure. If any pressure measurement value of the first pressure sensor 109 and/or the second pressure sensor 209 acquired by the control module is too small, the opening degree of the corresponding first pneumatic emission regulating valve 106 and/or the second pneumatic emission regulating valve 205 is reduced, and the pipeline pressure is properly increased; if any pressure measurement value in the first pressure sensor 109 and/or the second pressure sensor 209 acquired by the control module is too large, the opening degree of the corresponding first pneumatic diffusion regulating valve 106 and/or the second pneumatic diffusion regulating valve 205 is increased, the pipeline pressure is relieved, and the phenomenon of 'pump holding back' of the gas drainage pump caused by overpressure of the gas conveying pipeline is prevented. If the pressure measurement value of the third pressure sensor 304 collected by the control module is abnormal, the pipeline pressure in the high-low concentration gas primary blending part 3 can be controlled by controlling the first pneumatic diffusion regulating valve 106 and/or the second pneumatic diffusion regulating valve 205.

In a specific embodiment of the present application, a multi-stage air gas flue gas mixer is disposed on the fourth conveying pipe of the gas secondary blending part, and is located at the front end of the fourth conveying pipe, and the upper end of the multi-stage air gas flue gas mixer is respectively provided with a regenerative flue gas flow regulating valve and a primary air inlet regulating valve, which are used for mixing primary blended gas, air and regenerative flue gas; the laser concentration analyzers are sequentially positioned at the rear end of the multi-section air gas flue gas mixer and used for measuring the gas concentration of the gas secondary mixing part and feeding back the gas concentration to the control module, wherein the types of the laser concentration analyzers comprise an in-situ type and an extraction type; the third flow meter is positioned at the rear ends of the laser concentration analyzers and used for monitoring the gas flow of the gas secondary mixing part and feeding back the gas flow to the control module; the main air inlet switch valve is positioned at the rear end of the third flowmeter, the time from the open position to the closed position of the main air inlet switch valve is not more than a third preset time threshold, and the minimum distance between the main air inlet switch valve and the plurality of laser concentration analyzers is not less than a second preset distance threshold; the main fan is positioned at the rear end of the main air inlet switch valve and sucks primary mixed gas, air and regenerative flue gas through negative pressure generated by the main fan; and the temperature sensors are positioned at the front ends of the laser concentration analyzers and the rear end of the main fan, and are used for detecting the temperature in the fourth conveying pipeline and feeding back the temperature to the control module.

In this embodiment, as shown in fig. 2, the fourth conveying pipeline in the gas secondary mixing part 4 includes a multi-stage air-gas-flue gas mixer 402, a second temperature sensor 404, an in-situ laser concentration analyzer 1, an in-situ laser concentration analyzer 2, a withdrawal laser concentration analyzer 407, a third flow meter 408, a main air inlet switch valve 409, a main fan 410, and a third temperature sensor 414. Wherein, the multistage air gas and flue gas mixer 402 is provided with a regenerative flue gas flow regulating valve 401 and a primary air inlet regulating valve 403. The time from the open position to the closed position of the primary air inlet switch valve 409 is not greater than a third preset time threshold, preferably, the third preset time threshold is 2 seconds, and the minimum distance from the extraction type laser concentration analyzer 407 is not less than a second preset distance threshold, preferably, the second preset distance threshold is 60 meters.

In a specific embodiment of the application, a purging fan switch valve is further arranged on the fourth conveying pipeline of the gas secondary mixing part, is positioned on the first branch pipeline at the rear end of the third flow meter, and is used for automatically controlling the opening and closing of the purging fan switch valve according to an air control instruction of the control module; the purging fan is positioned at the rear end of the purging fan switch valve on the first branch pipeline and used for purging the conveying pipeline of the gas safety blending system; and the fresh air valve is positioned on the second branch pipeline at the rear end of the main air inlet switch valve and used for automatically controlling the on-off of the fresh air valve according to the air control instruction of the control module.

In the specific embodiment, the air inlet end of the purging fan is communicated with the atmosphere, the air outlet end of the purging fan is communicated with a main gas inlet pipeline, namely a fourth conveying pipeline, and a purging fan switch valve is arranged between the outlet of the purging fan and the fourth conveying pipeline; one end of the fresh air valve is connected with the fourth conveying pipeline, and the other end of the fresh air valve is communicated with the atmosphere.

In one embodiment of the present application, as shown in fig. 2, the first temperature sensor 306 in the high-low concentration gas primary blending portion 3 and the second temperature sensor 404 and the third temperature sensor 414 in the gas secondary blending portion 4 have functions of detecting the temperature of the blending gas and the pipe temperature. The detection data of the second temperature sensor 404 is used as the basis for adjusting the flow regulation of the regenerative flue gas flow regulating valve 401, when the temperature measurement value exceeds the temperature high-temperature threshold value or is lower than the temperature low-temperature threshold value, the control module gives an alarm and sends a command for controlling the flue gas flow to the regenerative flue gas flow regulating valve 401, so that the temperature is ensured to be within a proper range, or the on-off of the regenerative flue gas flow regulating valve 401 is controlled to be closed, and danger is avoided. The types of the first flow meter 110 in the high-concentration gas safe delivery part 1, the second flow meter 303 in the high-concentration gas primary blending part 3 and the third flow meter 408 in the gas secondary blending part can be V-cone type, and the V-cone type gas safe delivery part has the performances of high long-term accuracy and good stability.

It should be noted that, in the process diagram of the gas safety blending system matched with the gas oxidation device shown in fig. 2, the valves in the regulating device include a first online wet-type bleeding valve 103, a first pneumatic bleeding regulating valve 106 and a high-concentration gas flow regulating valve 112 in the high-concentration gas safety conveying part 1; a second online wet type bleeding valve 202, a second pneumatic bleeding regulating valve 205, a second pneumatic single-action emergency cut valve 210 in the low-concentration gas safe delivery portion 2; a blending gas flow rate adjusting valve 305 in the high-low concentration gas primary blending portion 3; a regenerative flue gas flow regulating valve 401, a primary air inlet regulating valve 403, a main air inlet switch valve 409, a fresh air valve 411 and a purging fan switch valve 412 in the gas secondary mixing part 4. The fans in the regulating device comprise a main fan 410 and a purge fan 413 in the gas secondary blending part 4.

In one embodiment of the present application, the multi-stage air gas and flue gas mixer includes a mixing chamber component located at a lower end of the multi-stage air gas and flue gas mixer, for mixing primary mixed gas and air to obtain a secondary mixed gas output, wherein the mixing chamber component is provided with a gas inlet and a mixer outlet; the gas inlet end of the gas lift pipe part is connected with the gas inlet, is positioned in the mixing chamber part and is used for conveying primary mixed gas, and a plurality of first openings are formed in the upper end of the gas lift pipe part and are used for outputting the primary mixed gas; the secondary air inlet component is positioned at the upper end of the multi-section air gas-smoke mixer, and is provided with a plurality of second openings which are used for communicating with the external atmosphere; the mixing chamber component is positioned between the mixing chamber component and the secondary air inlet component and is used for mixing primary mixed gas, air and flue gas, and a primary air inlet cavity, a regenerative flue gas inlet cavity, at least one primary air inlet and one regenerative flue gas inlet are arranged on the mixing chamber component; the primary air inlet adjusting part is positioned in the mixing chamber part and is arranged at the joint of the primary air inlet and the primary air inlet cavity, and an adjustable disc plate is arranged on the primary air inlet adjusting part and automatically adjusts the cross-sectional area of the primary air inlet under the control of the control module.

In this embodiment, the mixing chamber part in the multi-section air gas-flue gas mixer is sequentially provided with a primary air inlet chamber and a regenerative flue gas inlet chamber from bottom to top, two primary air inlets and a regenerative flue gas inlet are provided, wherein the primary air inlets are connected with a primary air inlet adjusting part, the regenerative flue gas inlet is connected with a flue gas exhaust pipeline of hot air generated by the gas oxidation device after waste heat utilization, the height of the primary air inlet chamber is lower than the position of a first opening hole in the flue gas exhaust pipe part, so that when the main fan is closed, the main fan rotates due to inertia, the mixed gas can be continuously conveyed towards the gas oxidation device, and because the position of the primary air inlet chamber is below, the air can be preferentially conveyed out, thereby protecting the gas oxidation device.

In an embodiment of the present application, the multistage air-gas-flue gas mixer further includes a plurality of first openings on the gas lift pipe component communicating the internal cavity of the gas lift pipe component with the mixing chamber inside the mixing chamber component, and the total area of the plurality of first openings is not less than the area of the gas inlet on the mixing chamber component; a plurality of third openings are formed in the primary air inlet cavity, the primary air inlet cavity is communicated with the mixing cavity through the third openings, and the total area of the third openings is not smaller than the sum of the areas of the at least one primary air inlet; the backheating flue gas inlet cavity is internally provided with a plurality of fourth openings, the backheating flue gas inlet cavity is communicated with the mixing cavity through the fourth openings, and the total area of the fourth openings is not smaller than the area of the backheating flue gas inlet.

In this embodiment, as shown in fig. 2, a plurality of first openings are formed in the circumferential direction of the upper end of the gas-lift pipe member, and the first openings are circular in shape, and the total area of the first openings is not smaller than the area of the gas inlet, so that the gas can be mixed at one time and can be discharged out of the gas-lift pipe member; a plurality of third openings are uniformly distributed in the circumferential direction in the primary air inlet cavity, the third openings are in the shape of a long groove, and the total area of the third openings is not smaller than that of the primary air inlet, so that air can conveniently enter the mixing chamber; a plurality of fourth apertures of circumferencial direction evenly distributed of backheating flue gas intake chamber inside, its shape is long flute profile, and a plurality of fourth apertures will be backheating flue gas intake chamber and mixing chamber are connected, can improve mist's temperature, prevent that multistage formula air gas blender and the detecting instrument of its rear end from freezing winter, guarantee detecting instrument's accuracy and security, also improved thermal utilization ratio.

FIG. 5 is a sectional view of the multi-stage air-gas/flue gas mixer in the embodiment of the present application.

In one embodiment shown in fig. 5, the multi-stage air/gas/flue gas mixer 402 is mainly composed of a mixing chamber member 4021, a blending chamber member 4022, a draft tube member 4023, a secondary air intake member 4024, and a primary air intake adjusting member 4025. The mixing chamber component 4021 is connected to the lower end of the mixing chamber component 4022, the mixing chamber component 4021 is connected to the draft tube component 4023, the upper end of the mixing chamber component 4022 is connected to the secondary air inlet component 4024, and the primary air inlet adjustment component 4025 is attached to the mixing chamber component 4022. The inner wall of the blending chamber component 4022 and the outer wall of the riser component 4023 enclose a blending chamber a. The mixing chamber member 4021 is provided with a gas inlet I and a mixer outlet II, and the inner cavity of the mixing chamber member 4021 is a mixing chamber b. A primary air inlet cavity c and a regenerative flue gas inlet cavity d are arranged on the mixing chamber component 4022, and two primary air inlets III and a regenerative flue gas inlet IV are arranged on the mixing chamber component, the primary air inlets III are connected with a primary air inlet adjusting component 4025, and the regenerative flue gas inlet IV is connected with a smoke exhaust pipeline after hot air produced by the gas oxidation device is utilized by waste heat. A first opening V is arranged in the circumferential direction of the upper end of the gas lift pipe component 4022, is circular, has the total area not smaller than the area of the gas inlet I on the mixing chamber component 4021, and communicates the inner cavity of the gas lift pipe component 4022 with the mixing chamber a; a second open hole VI which is in a long groove shape and is provided with a stainless steel wire mesh is formed in the circumferential direction of the secondary air inlet part 4024 and communicated with the external atmosphere; third open holes VII which are in a long groove shape are uniformly distributed in the circumferential direction in the primary air inlet cavity c, the primary air inlet cavity c is connected with the mixing cavity a, and the total area of the third open holes VII is not less than the sum of the areas of the two primary air inlets III; fourth holes VIII are uniformly distributed in the inner circumferential direction of the regenerative flue gas inlet cavity d, are in a long groove shape, are used for connecting the regenerative flue gas inlet cavity d with the mixing cavity a, and have the total area not smaller than the area of a regenerative flue gas inlet IV; the primary air inlet adjusting component 4025 is provided with an adjustable disc plate e, which can automatically adjust the cross-sectional area of the primary air inlet III under the control of the control module. The multi-stage air-gas-fume mixer 402 needs the negative pressure generated by the main fan 410 to make the gas enter the mixing chamber b during operation, when the concentration of the mixed gas exceeds the limit due to the failure of other devices in the gas safety mixing system and the mixed gas is not allowed to enter the gas oxidation device, the control module controls the main fan 410 to stop, and cut off the related gas inlet valve, if the valve fails to close completely, the once mixed gas will enter the gas-raising pipe, however, since the main blower 410 does not stop rotating completely, a negative pressure environment is still present in the mixing chamber b, and the air is continuously sucked into the mixing chamber and transported to the rear end pipeline, at the moment, because the height of the primary air inlet cavity is lower than the position of the first opening in the air lift pipe component, the primary air inlet cavity is positioned below the air lift pipe component, air can be preferentially sucked and conveyed to the gas oxidation device, and therefore the gas oxidation device is protected; after the main blower 410 is completely stopped, the negative pressure environment is lost in the mixing chamber b, the primary mixed gas is discharged to the atmosphere through the second opening vi arranged in the circumferential direction on the secondary air inlet part 4024, and the air entering the mixing chamber b is conveyed to the rear end pipeline and enters from the primary air inlet, so that the safety protection effect of the gas oxidation device is achieved.

In one embodiment of the present application, the control module in a gas safety blending system associated with a gas oxidizer may be directly in hardware, in a software module executed by a processor, or in a combination of both.

A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.

The Processor may be a Central Processing Unit (CPU), other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), other Programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

Fig. 6 shows an embodiment of a method for safely blending gas according to the present application.

In one embodiment shown in fig. 6, a method for safely blending gas mainly includes a gas safe conveying step, in which high-concentration gas output from a positive pressure end of a gas drainage station is conveyed to a high-low concentration gas primary blending part through a high-concentration gas safe conveying part, and low-concentration gas output from the positive pressure end of the gas drainage station is conveyed to the high-low concentration gas primary blending part through a low-concentration gas safe conveying part; a gas primary mixing step, namely uniformly mixing high-concentration gas and low-concentration gas in a high-concentration and low-concentration gas primary mixing part to obtain primary mixed gas; a gas secondary mixing step, wherein the gas secondary mixing part carries out secondary mixing on the primary mixed gas, air and regenerative flue gas through negative pressure generated by a main fan to obtain secondary mixed gas; and a control step, wherein the control module is used for collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part, and adjusting corresponding adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part according to the size relation between the monitoring parameters and corresponding preset parameters, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, the preset parameters comprise pressure threshold values, instantaneous pure quantity threshold values, gas concentration threshold values, flow threshold values and/or temperature threshold values, and the adjusting devices comprise valves and/or fans.

In this embodiment, the preset parameters include a pressure threshold, an instantaneous pure quantity threshold, a gas concentration threshold, a flow threshold, and/or a temperature threshold, wherein the instantaneous pure quantity threshold may include a pure quantity alarm threshold, a pure quantity shutdown threshold, the gas concentration threshold may include a gas concentration stable threshold, a gas concentration alarm threshold, a gas concentration shutdown threshold, a gas concentration sudden change alarm threshold, and a gas concentration sudden change cutoff threshold, and the temperature threshold may include a high temperature threshold, a low temperature threshold. In the step of safe gas conveying, the high-concentration gas safe conveying part and the low-concentration gas safe conveying part respectively adjust the conveying flow and the pipeline pressure of the corresponding high-concentration gas and low-concentration gas according to the gas control instruction of the control module, and convey the high-concentration gas and the low-concentration gas; when the gas concentration of the gas secondary mixing part is lower than a gas concentration stable threshold value, the conveying flow of high-concentration gas is increased, and when the pipeline pressure of the high-concentration gas safe conveying part, the low-concentration gas safe conveying part and/or the high-concentration gas primary mixing part and the low-concentration gas primary mixing part is larger than a pressure threshold value, the pipeline pressure of the high-concentration gas and the low-concentration gas is decreased; in the step of primary mixing of the gas, the primary mixing part of the high-concentration gas and the low-concentration gas adjusts the conveying flow of the primary mixed gas according to a gas control instruction of the control module; when the gas concentration of the high-concentration gas and low-concentration gas primary mixing part and/or the gas secondary mixing part is lower than a gas concentration stability threshold value, the conveying flow rate of the high-concentration gas and/or the conveying flow rate of the primary mixing gas are increased; in the gas secondary mixing step, the gas secondary mixing part adjusts the conveying flow of air or ventilation air according to a gas control instruction of the control module, mixes the primary mixed gas and the air to obtain secondary mixed gas, and conveys the secondary mixed gas to a gas oxidation device; and when the gas concentration of the gas secondary mixing part is lower than the gas concentration stable threshold value, the flow rate of the air is reduced. In the control step, monitoring parameters in the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part are collected and analyzed in a unified mode, the gas safety conveying step, the gas primary mixing step and/or the gas secondary mixing step are automatically controlled, the concentration, the purity and/or the flow of mixed gas are controlled and protected, potential safety hazards of a gas oxidation device due to the fact that the gas concentration problem is avoided, and the problem that the oxidation efficiency of the gas oxidation device is low due to the fact that the gas purity is insufficient is avoided.

In this embodiment, high concentration gas safety conveying part and low concentration gas safety conveying part mainly guarantee the safety and stability supply of high concentration gas and low concentration gas, guarantee that pipeline's pressure is in the fit range, set up safety arrangement, guarantee that low concentration gas does not take place the explosion accident in pipeline transportation process. The high-low concentration gas primary mixing part and the gas secondary mixing part mainly ensure gas concentration, gas flow and gas purity, provide mixed gas meeting requirements, and ensure that pipeline pressure and pipeline temperature are in normal ranges to prevent safety problems; the control module collects and analyzes monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, and according to gas control instructions obtained after the monitoring parameters and preset parameters are analyzed, the control module adjusts adjusting devices of all parts to achieve functions of quantitative uniform mixing of gas, automatic control of gas concentration, protection of gas concentration mutation, protection of gas flow mutation, protection of gas concentration overrun and overpressure protection of a gas extraction pump.

In a specific example of the application, a gas concentration stabilizing threshold, a gas concentration alarm threshold, a gas concentration shutdown threshold, a gas concentration sudden change alarm threshold, a gas concentration sudden change cutoff threshold, a gas flow threshold, a pressure threshold, a temperature threshold, an instantaneous pure quantity alarm threshold and/or an instantaneous pure quantity shutdown threshold are respectively set in the high-concentration gas safe conveying part, the low-concentration gas safe conveying part, the high-low concentration gas primary blending part and the gas secondary blending part; when the monitoring parameters acquired and analyzed by the control module exceed the corresponding gas concentration alarm threshold, gas concentration sudden change alarm threshold, temperature threshold and/or instantaneous pure quantity alarm threshold, the control module gives an alarm; when the monitoring parameters acquired and analyzed by the control module exceed the corresponding gas concentration sudden change cut-off threshold value, the control module adjusts a pneumatic diffusion regulating valve and a pneumatic single-action emergency cut-off valve of the high-concentration gas safety conveying part; when the monitoring parameters acquired and analyzed by the control module exceed the corresponding gas concentration shutdown threshold and/or instantaneous pure quantity shutdown threshold, the control module adjusts adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary mixing part and the low-concentration gas secondary mixing part, so that all parts act in a coordinated manner, the gas supply to the gas oxidation device is stopped, the gas is safely diffused, and the overpressure of the pipeline is avoided.

In one specific example of the present application, the control module automatically adjusts the opening degree of the first pneumatic bleeding regulating valve 106 in accordance with the pressure measurement value in the second pressure sensor 109 provided in the high-concentration gas delivery portion 1. When the pressure measurement value is greater than the pressure safety threshold, the opening of the first bleeding regulating valve 106 is automatically increased until the pressure measurement value reaches the pressure safety threshold minus the return difference value; when the pressure measurement is less than the pressure safety threshold, the opening of the first purge adjustment valve 106 is automatically decreased until the pressure measurement reaches the pressure safety threshold plus the difference.

In a specific example of the present application, the control module automatically adjusts the opening degree of the second pneumatic diffusion regulating valve 205 in accordance with the pressure measurement value in the third pressure sensor 209 in the low-concentration gas delivery section 2 that is set. When the pressure measurement value is greater than the pressure safety threshold, the opening of the second purge regulating valve 205 is automatically increased until the pressure measurement value reaches the pressure safety threshold minus the return difference value; when the pressure measurement is less than the pressure safety threshold, the opening of the second purge adjustment valve 205 is automatically decreased until the pressure measurement reaches the pressure safety threshold plus the difference.

In a specific example of the present application, when the control module detects that the gas mutation of the first in-situ laser concentration analyzer 102 on the main gas conveying pipeline in the high-concentration gas conveying part 1 is over 2% within 2s, that is, the concentration measurement value exceeds the gas concentration mutation alarm threshold, the control module gives an alarm to prompt; when the gas mutation within 2s exceeds 3 percent, namely the concentration measurement value exceeds the gas concentration mutation cut-off threshold value, the control module automatically opens the first pneumatic diffusion regulating valve 106 to the maximum, closes the first pneumatic single-action emergency cut-off valve 111, cuts off the gas source of high-concentration gas and prevents the high-concentration gas from entering a primary mixing link.

In one embodiment of the present application, the control module may set a gas concentration alarm threshold value, a gas concentration shutdown threshold value after the multi-stage air gas flue gas mixer 402. When the control module detects that any one concentration measurement value of the No. 1 in-situ laser concentration analyzer 405, the No. 2 in-situ laser concentration analyzer 406 and the removable laser concentration analyzer 407 exceeds a gas concentration alarm threshold value, the control module sends an alarm prompt; when any concentration measurement value exceeds a gas concentration shutdown threshold value, the control module automatically opens the first pneumatic diffusion regulating valve 106 to the maximum, opens the second pneumatic diffusion regulating valve 205 to the maximum, closes the first pneumatic single-action emergency stop valve 111, closes the second pneumatic single-action emergency stop valve 210, closes the blended gas flow regulating valve 305, closes the high-concentration gas flow regulating valve 112, opens the primary air inlet regulating valve 403 in the multi-section air gas-flue gas mixer 402 to the maximum, closes the main air inlet switch valve 409, closes the main fan 410, opens the fresh air valve 411, opens the purge fan switch valve 412 and opens the purge fan 413 so as to ensure that gas with concentration exceeding the limit does not enter the gas oxidation device.

In a specific example of the present application, the control module calculates the instantaneous pure quantity according to the measured value of the gas concentration in the second in-situ laser concentration analyzer 302 in the high-low concentration gas primary mixing part 3 and the measured value of the flow rate in the second flow meter 303, and the control module can set an instantaneous pure quantity alarm threshold value and an instantaneous pure quantity shutdown threshold value. When the instantaneous pure quantity value is larger than the instantaneous pure quantity alarm threshold value, the control module gives an alarm for prompt; when the instantaneous pure value is larger than the instantaneous pure value shutdown threshold value, the control module automatically opens the first pneumatic bleeding regulating valve 106 to the maximum, opens the second pneumatic bleeding regulating valve 205 to the maximum, closes the first pneumatic single-action emergency cutoff valve 111, closes the second pneumatic single-action emergency cutoff valve 210, closes the high-concentration gas flow regulating valve 112, closes the blended gas flow regulating valve 305, opens the primary air intake regulating valve 403 to the maximum, closes the main air intake switching valve 409, closes the main fan 410, opens the fresh air valve 411, opens the purge fan switching valve 412, and opens the purge fan 413.

In one embodiment of the present application, the control module may automatically adjust the main fan frequency by analyzing the flow measurement value in the third flow meter 408 at the rear end of the multi-stage air-gas-flue gas mixer 402, comparing it with the flow threshold value, so as to adjust the total mixed air volume.

In a specific example of the present application, the control module automatically adjusts the gas concentration at the rear end of the multi-stage air-gas-and-flue-gas mixer 402 in a closed-loop manner, and the control module controls the blending gas flow regulating valve 305, the high-concentration gas flow regulating valve 112, the first pneumatic diffusion regulating valve 106, and the second pneumatic diffusion regulating valve 205 to coordinate with each other by comparing the preset target concentration value with the gas concentration measurement value in the No. 1 in-situ laser concentration analyzer 405 and the gas concentration measurement value in the No. 2 in-situ laser concentration analyzer, so as to stabilize the gas concentration near the gas concentration stabilizing threshold.

The realization principle and the technological effect that the gas safety blending method that this application provided and the supporting gas safety blending system of gas oxidation device that this application provided are similar are no longer repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, systems or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all equivalent structural changes made by using the contents of the specification and the drawings, which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.

Claims

1. The utility model provides a with supporting gas safety blending system of gas oxidation device which characterized in that includes: a high-concentration gas safe conveying part, a low-concentration gas safe conveying part, a high-concentration gas and low-concentration gas primary mixing part, a gas secondary mixing part and a control module, wherein,

the high-concentration gas safety conveying part is connected to the positive pressure end of the gas drainage station and used for adjusting the flow of high-concentration gas according to a gas control instruction of the control module and conveying the high-concentration gas;

the low-concentration gas safe conveying part is connected to the other positive pressure end of the gas drainage station and used for adjusting the flow of low-concentration gas according to the gas control instruction of the control module and conveying the low-concentration gas;

the high-concentration gas and low-concentration gas primary mixing part is connected with the rear end of the high-concentration gas safe conveying part and the rear end of the low-concentration gas safe conveying part respectively and is used for fully mixing the high-concentration gas and the low-concentration gas to obtain primary mixed gas;

the gas secondary mixing part is connected to the rear end of the high-low concentration gas primary mixing part and is used for carrying out secondary mixing on the primary mixed gas, air and regenerative flue gas to obtain secondary mixed gas, and the secondary mixed gas is conveyed to a gas oxidation device; and

the control module is integrated in a gas safety blending system and used for respectively collecting and analyzing monitoring parameters of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and/or the gas secondary blending part and controlling corresponding adjusting devices of the high-concentration gas safety conveying part, the low-concentration gas safety conveying part, the high-concentration gas primary blending part and/or the gas secondary blending part, wherein the monitoring parameters comprise pressure measurement values, instantaneous pure quantity values, gas concentration measurement values, flow measurement values and/or temperature measurement values, and the adjusting devices comprise valves and/or fans.

2. The gas safety blending system matched with the gas oxidation device according to claim 1, wherein the first conveying pipeline of the high-concentration gas safety conveying part is provided with:

the first in-situ laser concentration analyzer is positioned at the front end of the first conveying pipeline and used for detecting the gas concentration of the high-concentration gas safety conveying part and feeding back the gas concentration to the control module, wherein the detection response time of the first in-situ laser concentration analyzer is not more than a first preset time threshold;

the first online wet-type bleeding valve is positioned at the rear end of the first in-situ laser concentration analyzer, and the upper end of the first online wet-type bleeding valve is sequentially provided with a first dry-type flame arrester and a first bleeding pipe, and the first online wet-type bleeding valve is used for discharging gas of the high-concentration gas safety conveying part and performing overpressure protection on the gas safety mixing system;

the first double-tank water-seal flame arrester is positioned at the rear end of the first online wet-type diffusion valve, a flange at the upper end of the first double-tank water-seal flame arrester is provided with a first pneumatic diffusion regulating valve, and the first pneumatic diffusion regulating valve is connected to the lower end of the first dry-type flame arrester and is used for automatically regulating the opening of the first pneumatic diffusion regulating valve according to a pressure control instruction of the control module so as to regulate the pressure of the first conveying pipeline;

the first dehydrator is positioned at the rear end of the first double-tank water-sealing flame arrester and is used for dehydrating the high-concentration gas;

the first pressure sensor is positioned at the rear end of the first dehydrator and used for detecting the pressure in the first conveying pipeline and feeding back the pressure to the control module;

the first flowmeter is positioned at the rear end of the first pressure sensor and used for detecting the gas flow of the high-concentration gas safe conveying part and feeding back the gas flow to the control module;

the first pneumatic single-action emergency cut-off valve is positioned at the rear end of the first flowmeter and used for cutting off the gas conveying of the high-concentration gas safety conveying part according to an emergency cut-off instruction of the control module, wherein the time from an open position to a closed position of the first pneumatic single-action emergency cut-off valve is not more than a second preset time threshold value, and the first pneumatic single-action emergency cut-off valve has a power-off or compressed air automatic closing function; and

high concentration gas flow control valve, it is located the rear end of first pneumatic single-action emergency cut-off valve for according to gas control command, automatically regulated high concentration gas flow control valve's aperture size controls the flow of high concentration gas.

3. The gas safety blending system matched with the gas oxidation device according to claim 2, wherein the first conveying pipeline of the high-concentration gas safety conveying part is further provided with:

and the soft sealing manual butterfly valves are respectively arranged at the front end of the first in-situ laser concentration analyzer and/or the rear end of the high-concentration gas flow regulating valve and used as manual protection valves for manually controlling the opening and closing of the high-concentration gas safety conveying part.

4. The gas safety blending system matched with the gas oxidation device according to claim 1, wherein the second conveying pipeline of the low-concentration gas safety conveying part is provided with:

the second online wet-type bleeding valve is positioned at the front end of the second conveying pipeline, and a second dry-type flame arrester and a second bleeding pipe are sequentially arranged at the upper end of the second online wet-type bleeding valve and used for discharging gas of the low-concentration gas safety conveying part and performing overpressure protection on the gas safety blending system;

the second double-tank water-seal flame arrester is positioned at the rear end of the second online wet-type diffusion valve, a second pneumatic diffusion regulating valve is arranged on an upper end flange of the second double-tank water-seal flame arrester and connected to the lower end of the second dry-type flame arrester, and the second pneumatic diffusion regulating valve is used for automatically regulating the opening of the second pneumatic diffusion regulating valve according to the pressure control instruction of the control module so as to regulate the pressure of the second conveying pipeline;

a type C filter which is positioned at the rear end of the second double-tank water-sealing flame arrester and is used for filtering impurities in low-concentration gas;

a third dry flame arrestor at a rear end of the C-filter for preventing flame ingress into or spread between the second transport pipes;

the second pressure sensor is positioned at the rear end of the second double-tank water seal flame arrester and used for detecting the pressure in the second conveying pipeline and feeding the pressure back to the control module;

the second pneumatic single-action emergency cut-off valve is positioned at the rear end of the second pressure sensor and used for cutting off the gas conveying of the low-concentration gas safety conveying part according to the emergency cut-off instruction of the control module, wherein the time from an open position to a closed position of the second pneumatic single-action emergency cut-off valve is not more than a second preset time threshold, and the second pneumatic single-action emergency cut-off valve has a power-off or compressed air automatic closing function;

the fine water mist generator is positioned at the rear end of the second pneumatic single-action emergency cut-off valve, and the upper end of the fine water mist generator is provided with a water mist pressure sensor which is used for protecting the delivery of the low-concentration gas; and

and the second dehydrator is positioned at the rear end of the fine water mist generator and is used for dehydrating the low-concentration gas.

5. The safe gas blending system matched with the gas oxidation device according to claim 1, wherein the third conveying pipeline of the high-concentration gas and low-concentration gas primary blending part is provided with:

a static mixer, located at the front end of the third conveying pipe, for mixing the high-concentration gas and the low-concentration gas;

the second in-situ laser concentration analyzer is positioned at the rear end of the static mixer and used for detecting the gas concentration of the primary mixing part of the high-concentration gas and the low-concentration gas and feeding back the gas concentration to the control module, wherein the distance between the second in-situ laser concentration analyzer and the static mixer is not less than a first preset distance threshold value;

the second flowmeter is positioned at the rear end of the second in-situ laser concentration analyzer and used for detecting the gas flow of the primary mixing part of the high-concentration gas and the low-concentration gas and feeding back the gas flow to the control module;

the third pressure sensor is positioned at the rear end of the second flowmeter and used for detecting the pressure in the third conveying pipeline and feeding back the pressure to the control module;

the blending gas flow regulating valve is positioned at the rear end of the third pressure sensor and used for automatically regulating the opening degree of the blending gas flow regulating valve according to the gas control instruction of the control module and controlling the gas flow conveyed to the gas secondary blending part by the high-concentration and low-concentration gas primary blending part; and

and the first temperature sensor is positioned at the rear end of the mixing gas flow regulating valve and used for detecting the temperature in the third conveying pipeline and feeding back the temperature to the control module.

6. The safe gas blending system matched with the gas oxidation device according to claim 1, wherein the fourth conveying pipeline of the secondary gas blending part is provided with:

the multi-section air gas and flue gas mixer is positioned at the front end of the fourth conveying pipeline, and the upper end of the multi-section air gas and flue gas mixer is respectively provided with a regenerative flue gas flow regulating valve and a primary air inlet regulating valve which are used for mixing the primary mixed gas, the air and the regenerative flue gas;

the laser concentration analyzers are sequentially positioned at the rear end of the multi-section air gas-flue gas mixer and used for measuring the gas concentration of the gas secondary mixing part and feeding back the gas concentration to the control module, wherein the types of the laser concentration analyzers comprise an in-situ type and/or an extraction type;

the third flow meter is positioned at the rear ends of the laser concentration analyzers and used for monitoring the gas flow of the gas secondary mixing part and feeding back the gas flow to the control module;

the main air inlet switch valve is positioned at the rear end of the third flowmeter, the time from an open position to an off position of the main air inlet switch valve is not more than a third preset time threshold, and the minimum distance between the main air inlet switch valve and the plurality of laser concentration analyzers is not less than a second preset distance threshold;

the main fan is positioned at the rear end of the main air inlet switch valve and is used for sucking the primary mixed gas and the air through negative pressure generated by the main fan; and

and the temperature sensors are positioned at the front ends of the laser concentration analyzers and/or the rear end of the main fan and used for detecting the temperature in the fourth conveying pipeline and feeding back the temperature to the control module.

7. The safe gas blending system matched with the gas oxidation device according to claim 6, wherein the fourth conveying pipeline of the secondary gas blending part is provided with:

the purging fan switch valve is positioned on a first branch pipeline at the rear end of the third flow meter and used for automatically controlling the opening and closing of the purging fan switch valve according to an air control instruction of the control module;

the purging fan is positioned at the rear end of the purging fan switch valve on the first branch pipeline and used for purging a conveying pipeline of the gas safety blending system; and

and the fresh air valve is positioned on a second branch pipeline at the rear end of the main air inlet switch valve and used for automatically controlling the on-off of the fresh air valve according to the air control instruction of the control module.

8. The gas safety blending system of claim 6, wherein the multi-stage air gas/flue gas mixer comprises,

the mixing chamber part is positioned at the lower end of the multi-section air gas-smoke mixer and is used for mixing the primary mixed gas and the air to obtain the output of the secondary mixed gas, and a gas inlet and a mixer gas outlet are formed in the mixing chamber part;

the gas lift pipe part is connected with the gas inlet at the gas inlet end, is positioned inside the mixing chamber part and is used for conveying the primary mixed gas, wherein a plurality of first openings are formed in the upper end of the gas lift pipe part and are used for outputting the primary mixed gas;

the secondary air inlet component is positioned at the upper end of the multi-section air gas-smoke mixer, and is provided with a plurality of second openings which are used for communicating with the external atmosphere;

it is characterized by also comprising:

the mixing chamber component is positioned between the mixing chamber component and the secondary air inlet component and is used for mixing the primary mixed gas, the air and the flue gas, and a primary air inlet cavity, a regenerative flue gas inlet cavity, at least one primary air inlet and one regenerative flue gas inlet are arranged on the mixing chamber component;

and the primary air inlet adjusting part is positioned in the mixing chamber part and is arranged at the joint of the primary air inlet and the primary air inlet cavity, an adjustable disc plate is arranged on the primary air inlet adjusting part, and the cross section area of the primary air inlet is automatically adjusted under the control of the control module.

9. The gas safety blending system of claim 8, wherein the multi-stage air gas mixer further comprises:

the plurality of first openings on the gas lift pipe part are used for communicating the inner cavity of the gas lift pipe part with the mixing cavity in the mixing chamber part, and the total area of the plurality of first openings is not less than the area of the gas inlet on the mixing chamber part;

a plurality of third openings are formed in the primary air inlet cavity, the primary air inlet cavity is communicated with the mixing cavity through the third openings, and the total area of the third openings is not less than the sum of the areas of the at least one primary air inlet;

the regenerative flue gas inlet cavity is internally provided with a plurality of fourth openings, the regenerative flue gas inlet cavity is communicated with the mixing cavity through the fourth openings, and the total area of the fourth openings is not smaller than that of the regenerative flue gas inlet.

10. A safe blending method of gas is characterized by comprising the following steps:

a gas safety conveying step, namely conveying high-concentration gas output by a positive pressure end of a gas drainage station to a high-low concentration gas primary mixing part through a high-concentration gas safety conveying part, and conveying low-concentration gas output by the positive pressure end of the gas drainage station to the high-low concentration gas primary mixing part through a low-concentration gas safety conveying part;

a gas primary mixing step, namely uniformly mixing the high-concentration gas and the low-concentration gas in the high-concentration and low-concentration gas primary mixing part to obtain primary mixed gas;

a gas secondary mixing step, wherein the gas secondary mixing part carries out secondary mixing on the primary mixed gas, air and regenerative flue gas through negative pressure generated by a main fan to obtain secondary mixed gas; and

a control step of collecting and analyzing the high-concentration gas safe conveying part and the low-concentration gas safe conveying part through a control module, monitoring parameters of the high-concentration gas primary mixing part and the low-concentration gas secondary mixing part and/or the monitoring parameters of the gas secondary mixing part, adjusting the high-concentration gas safe conveying part according to the size relation between the monitoring parameters and the corresponding preset parameters, the low-concentration gas safe conveying part, the high-concentration gas primary mixing part and/or the gas secondary mixing part are/is provided with corresponding adjusting devices, wherein the monitoring parameters comprise pressure measurements, instantaneous purity values, gas concentration measurements, flow measurements and/or temperature measurements, the preset parameters comprise a pressure threshold, an instantaneous pure quantity threshold, a gas concentration threshold, a flow threshold and/or a temperature threshold, and the adjusting device comprises a valve and/or a fan.