Coke oven system and dry quenching circulating gas loop coupling system and control method thereof

Abstract

The invention discloses a coupling system of a coke oven system and a coke dry quenching circulating gas loop and a control method thereof, the coupling system comprises the coke dry quenching circulating gas loop and the coke oven system, a first pipeline is used for introducing part of circulating gas generated by a coke dry quenching furnace into a coke oven or a coke oven flue gas pipeline; a part of redundant circulating gas of the dry quenching furnace is led out to the coke oven system from the first pipeline, the gas leakage and explosion risks of the dry quenching furnace can be reduced, meanwhile, inert components in the circulating gas can dilute combustible components of coke oven gas, the combustion intensity of the coke oven gas is reduced, and generation of NOx in coke oven waste gas is reduced; or part of the circulating gas is treated through a flue gas purification device of the coke oven system, so that the capacity of purification equipment of a dry quenching dust removal system is reduced, and the pipeline arrangement redundancy complexity of a dry quenching area is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical coking, and in particular to a coupling system of a coke oven system and a dry quenching circulating gas loop and a control method thereof. Background Art

[0002] The coke oven system includes coke ovens, which produce coke oven flue gas during the production process. Coke oven flue gas contains SO2, which is one of the important sources of atmospheric pollution; NOx is one of the sources of photochemical smog pollution. Both of them cause great pollution and harm to the atmospheric environment. Therefore, the coke oven flue gas needs to undergo a purification process before being discharged into the atmosphere.

[0003] The CDQ recirculating gas loop is a highly efficient technology that continuously recovers and utilizes the sensible heat of high-temperature red coke using inert gas. During the quenching process, the red coke enters the top of the CDQ furnace, where it flows countercurrently with the circulating cooling gas, completing a convective heat exchange process. The cooled solid particles are discharged from the bottom of the vertical furnace. The high-temperature gas, having fully absorbed the sensible heat of the red coke, enters subsequent devices through the CDQ furnace exhaust for waste heat utilization, such as steam generation or power generation. This process is widely used due to its high waste heat recovery rate and environmentally friendly operation.

[0004] Regarding the control of the composition of the CDQ circulating gas, the carbon monoxide and hydrogen content during the operation of the CDQ unit is related to the operational safety of the unit. During the heat preservation and quality upgrading of the red coke in the CDQ pre-storage section, the continued pyrolysis and conversion of residual volatiles release carbon monoxide, as well as a small amount of hydrogen and methane. Therefore, in current technology, an air inlet is set up in the upper part of the CDQ pre-storage section to continuously or intermittently introduce a small amount of air to burn all or part of the carbon monoxide and hydrogen released during the quality upgrading of the red coke in the pre-storage section. This controls the concentration of combustible components in the pre-storage section material layer and the upper space, reducing the risk of explosion from gas leakage in the CDQ furnace.

[0005] Regarding the CDQ circulating gas pressure control, the above-mentioned component control process will produce excess circulating gas, causing the internal pressure of the system to increase. A gas release system is set up to release a portion of the circulating gas according to the pressure control range. This part of the released gas contains toxic, harmful or combustible gases and particulate matter such as SO2, CO, H2, etc., and a special ground station needs to be set up to remove it, and it will be discharged into the atmosphere after meeting the standards.

[0006] At present, the coke oven system and the dry quenching coke circulating gas loop are independent of each other. A coke oven flue gas desulfurization and denitrification system and a dry quenching coke dust removal ground station are respectively set up to treat the two types of flue gas. In order to meet local ultra-low emission indicators, some coking enterprises have set up two sets of ground dust removal systems in the dry quenching section to treat the emitted gases at different locations respectively.

[0007] How to reduce the use cost of each system as much as possible is an important issue that technicians in this field have always paid attention to. Summary of the Invention

[0008] The purpose of the embodiment of the present application is to provide a coupled system of a coke oven system and a CDQ circulating gas loop, which has relatively low operating costs. Another purpose of the embodiment of the present application is to provide a control method for the coupled system of a coke oven system and a CDQ circulating gas loop.

[0009] The present application provides a coupling system of a coke oven system and a dry quenching coke circulating gas loop, comprising:

[0010] CDQ cycle gas loop, including CDQ furnace;

[0011] Coke oven systems, including coke ovens;

[0012] A first pipeline and a first flow valve, wherein the first pipeline is used to introduce part of the circulating gas generated by the dry quenching furnace into the interior of the coke oven; the first flow valve is arranged on the first pipeline and is used to adjust the flow of the circulating gas in the first pipeline.

[0013] In this way, when the circulating gas in the CDQ circulating gas loop exceeds the preset amount, a portion of the excess circulating gas from the CDQ furnace can be discharged from the first pipeline into the coke oven, so as to control the concentration of combustible components in the CDQ circulating gas and reduce the risk of CDQ furnace gas leakage and explosion; the circulating gas discharged from the CDQ circulating gas loop contains combustible components, which can be mixed with the coal gas introduced into the coke oven and used as fuel for heating the coke oven. At the same time, the inert components in the circulating gas can dilute the combustible components of the coke oven gas, reduce the combustion intensity of the coke oven gas, and reduce the generation of NOx in the coke oven exhaust gas.

[0014] The circulating gas (circulating gas) derived from the CDQ circulating gas loop can be mixed with coal gas and used as fuel for heating the coke oven. This fully utilizes the combustible gas components such as CO, CH4, and H2 in the circulating gas, which is beneficial to energy conservation and consumption reduction, avoids direct emissions that pollute the atmosphere, and reduces the investment in a series of equipment for pollutant treatment. The inert gas contained in the circulating gas plays a role in diluting the combustible gas, which can improve the flame shape and combustion uniformity, regulate the combustion intensity and stability, and is beneficial to the thermal regulation of the coke oven, reduce energy consumption, and reduce pollutants at the source.

[0015] Alternatively, in the embodiment of the present application, when the circulating gas in the CDQ circulating gas loop exceeds a preset amount, a portion of the excess circulating gas from the CDQ oven can be directly guided from the first pipeline to the coke oven flue gas pipeline. In this way, the flue gas can be processed by the flue gas purification device of the coke oven system, thereby reducing the purification equipment capacity of the CDQ dust removal system and reducing the redundancy and complexity of the pipeline layout in the CDQ area.

[0016] In one example, the following is also included:

[0017] The second pipeline and the second flow valve, the second pipeline is used to introduce part of the coke oven flue gas generated by the coke oven into the dry quenching circulating gas loop; the second flow valve is set in the second pipeline, used to adjust the flow of the coke oven flue gas in the second pipeline.

[0018] In one example, the coke oven system further includes a mixer and a gas inlet pipeline, the first pipeline includes pipeline 1, the first flow valve is arranged on pipeline 1, the end of pipeline 1 away from the dry quenching circulating gas loop and the gas inlet pipeline are both connected to the mixer, and the gas outlet of the mixer is connected to the gas inlet of the coke oven.

[0019] In one example, the dry quenching circulating gas loop further includes a dry quenching boiler and a secondary dust collector. Along the fluid flow direction in the dry quenching circulating gas loop, the dry quenching furnace, the dry quenching boiler and the secondary dust collector are connected in sequence by pipelines, and pipeline 1 is connected to the downstream pipeline of the secondary dust collector.

[0020] In one example, the CDQ circulating gas loop further includes a CDQ fan and a heat exchanger. The CDQ fan and the heat exchanger are sequentially arranged between the secondary dust collector and the flue gas inlet of the CDQ furnace. The CDQ fan is used to provide flow power for the flue gas in the CDQ circulating gas loop; the heat exchanger is used to exchange heat between the circulating gas in the CDQ circulating gas loop and the desalted water flowing into the CDQ boiler; the other end of the second pipeline is connected to the pipeline between the CDQ fan and the heat exchanger.

[0021] In one example, a variable frequency induced draft fan is further included, which is arranged in the first pipeline; the variable frequency induced draft fan is located in the upstream pipeline of the mixer; the variable frequency induced draft fan is used to provide flow power for the circulating gas in the first pipeline;

[0022] Alternatively or additionally, further comprising a variable frequency blower, disposed in the second pipeline, the variable frequency blower being configured to provide flow power for the flue gas in the second pipeline;

[0023] Alternatively, or / and, the coke oven system further comprises a flue gas purification device, which is connected downstream of the flue gas outlet of the coke oven, and one end of the second pipeline is connected to the connecting pipeline between the flue gas outlet of the coke oven and the flue gas purification device.

[0024] In one example, the coke oven system further includes a flue gas purification device, which is connected downstream of the flue gas outlet of the coke oven.

[0025] The first pipeline also includes a pipeline 2, which is provided with a third flow valve. One end of the pipeline 2 is connected to the pipe section of the pipeline 1 located upstream of the mixer, and the other end is connected to the flue gas inlet of the flue gas purification device.

[0026] In one example, the following is also included:

[0027] a detection module, configured to detect a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters;

[0028] The controller adjusts the openings of the first flow valve, the second flow valve and the third flow valve according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0029] In addition, an embodiment of the present application further provides a coupling system of a coke oven system and a dry quenching gas loop, comprising:

[0030] CDQ cycle gas loop, including CDQ furnace;

[0031] Coke oven systems, including coke ovens;

[0032] The second pipeline and the second flow valve, the second pipeline is used to introduce part of the coke oven flue gas generated by the coke oven into the interior of the dry quenching furnace; the second flow valve is set in the second pipeline, used to adjust the flow of the coke oven flue gas in the second pipeline.

[0033] A portion of the waste flue gas from the coke oven can be led along a second pipeline to the CDQ circulating gas loop, serving as inert gas for CDQ and a source of gas to stabilize the pressure of the CDQ circulating gas loop. The excess air in the coke oven waste flue gas can also serve as a combustion-supporting gas, reacting with the combustible components of the gas in the CDQ circulating gas loop to reduce the combustible gas components. The coke oven system and the CDQ circulating gas loop are coupled for collaborative processing, with a portion of the flue gas produced by the coke oven used as inert gas for CDQ. The excess air in the coke oven flue gas is used as the combustion-supporting gas for the circulating gas, eliminating the need to introduce fresh air, which has a lower oxygen content than fresh air and a lower reaction intensity with the combustible gas. This avoids high-temperature accidents within the circulating gas, reduces red coke burnout, and is beneficial to equipment safe operation and environmental protection. This coupling system uses part of the flue gas generated by the coke oven as inert gas introduced into the CDQ circulating gas loop, which can reduce the capacity of the flue gas purification device in the coke oven system; uses the coke oven waste flue gas as inert gas introduced into the CDQ, which reduces the amount of nitrogen supplemented in the circulating gas in the CDQ circulating loop and reduces the cost of nitrogen production.

[0034] In addition, an embodiment of the present application further provides a control method for a coupled system of a coke oven system and a dry quenching gas loop, the control method comprising:

[0035] detecting a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters;

[0036] The openings of the first flow valve and the second flow valve are adjusted according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0037] In one example, a variable frequency induced draft fan is provided on the first pipeline, and a variable frequency supply fan is provided on the second pipeline; the control method adjusts the opening of the first flow valve and the second flow valve while also adjusting the speed of the induced draft fan and the speed of the supply fan, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0038] Furthermore, an embodiment of the present application further provides a control method for a coupled system of a coke oven system and a CDQ circulating gas loop, the control method comprising:

[0039] detecting a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters;

[0040] The openings of the first flow valve, the second flow valve and the third flow valve are adjusted according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0041] In one example, a variable frequency induced draft fan is provided on the first pipeline, and a variable frequency supply fan is provided on the second pipeline; the control method adjusts the opening of the first flow valve, the second flow valve and the third flow valve while also adjusting the speed of the induced draft fan and the speed of the supply fan, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0042] The control method provided in this application is based on the coupled system, so the control method also has the above-mentioned technical effects of the coupled system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A block diagram of a coupled system of a coke oven system and a dry quenching gas loop provided in an embodiment of the present application;

[0044] Figure 2 A block diagram of a coupled system of a coke oven system and a dry quenching gas loop according to another embodiment of the present application;

[0045] Figure 3 This is a block diagram of a coupled system of a coke oven system and a dry quenching gas loop in another embodiment provided in the embodiments of the present application.

[0046] in, Figures 1 to 3 The reference numerals in the figures are described as follows:

[0047] 100 circulating gas loop; 101 CDQ furnace; 102 primary dust collector; 103 CDQ boiler; 104 secondary dust collector; 105 CDQ fan; 106 heat exchanger; 107 deaerator; 108 discharge device; 109 loading device;

[0048] 200 coke oven system; 201 coke oven; 202 desulfurization device; 203 dust removal device; 204 denitrification device; 205 waste heat recovery device; 206 desulfurization and denitrification induced draft fan; 207 chimney;

[0049] 110 Pipeline 1; 111 First flow valve; 112 Induced draft fan; 113 Mixer; 130 Pipeline 2; 131 Third flow valve;

[0050] 120 second pipeline; 121 second flow valve; 122 air blower. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the embodiments of the present application are further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Please refer to Figure 1 , Figure 1 A block diagram of a coupled system of a coke oven system and a dry quenching gas loop in an embodiment of the present application is provided.

[0053] The embodiment of the present application provides a coupling system of a coke oven system 200 and a dry quenching coke circulating gas loop 100, comprising a dry quenching coke circulating gas loop 100 and a coke oven system 200. The dry quenching coke circulating gas loop 100 comprises a dry quenching oven 101, a primary dust collector 102, a dry quenching coke boiler 103, a secondary dust collector 104, a dry quenching coke blower 105, and a heat exchanger 106, wherein the above components are sequentially connected through pipelines to form a circulation loop 100. The top of the dry quenching oven 101 is provided with a red coke inlet, and the red coke is placed inside the dry quenching oven 101 through a loading device 109. The bottom of the dry quenching oven 101 is also provided with a coke outlet. The red coke fed from the top exchanges heat with the low-temperature circulating gas inside the dry quenching oven 101, and the circulating gas becomes a high-temperature circulating gas, and the temperature of the red coke decreases. After the heat exchange, the red coke is transported from the coke outlet at the bottom of the dry quenching oven 101 to the subsequent process by the discharge device 108. The high-temperature circulating gas is dedusted by the primary dust collector 102 and then enters the dry quenching boiler 103. The high-temperature circulating gas heats the desalted water in the dry quenching boiler 103 to generate steam, which is then sent to the power plant to drive the steam turbine and generator.

[0054] In order to describe the technical solution concisely, this application document defines the high-temperature circulating gas flowing out of the dry quenching furnace 101 as circulating gas.

[0055] Coke oven system 200 includes at least a coke oven 201 and a flue gas purification unit 2-1. Flue gas purification unit 2-1 may include one or more of a desulfurization unit 202, a dust removal unit 203, a denitrification unit 204, a waste heat recovery unit 205, and a desulfurization and denitrification induced draft fan 206. The order of these units (202-206) in flue gas purification unit 2-1 can be adjusted to meet different process requirements. Flue gas purification unit 2-1 primarily removes harmful components from coke oven flue gas to ensure that the flue gas meets emission standards. Flue gas that meets emission standards is then discharged to the environment through a subsequent coke oven chimney 207. Currently, the process for purifying coke oven flue gas typically utilizes a sodium carbonate desulfurization process followed by SCR denitrification and waste heat recovery. Selective catalytic reduction (SCR) is the most mature flue gas denitrification technology. It utilizes a reducing agent (NH3, urea) in the presence of a metal catalyst to selectively react with NOx to produce N2 and H2O, thereby meeting emission standards.

[0056] In the embodiment of the present application, the coke oven 201 generally has a gas inlet and an air inlet. External air enters the coke oven through the air inlet, and gas enters the coke oven through the gas inlet. The coke oven flue gas generated by the combustion of the gas inside the coke oven flows out through the flue gas outlet of the coke oven.

[0057] The coupling system of the embodiment of the present application further includes a first pipeline and a second pipeline 120. The first pipeline is used to introduce part of the circulating gas generated by the dry quenching furnace 101 into the interior of the coke oven or / and the coke oven flue gas pipeline of the coke oven system 200. Figure 1 The figure shows a coke oven flue gas pipeline in which the first pipeline guides the circulating gas to the interior of the coke oven and is connected to the flue gas outlet of the coke oven. Figure 3 FIG. 3 shows only an embodiment in which the first pipeline guides the circulating gas to the coke oven flue gas pipeline.

[0058] In the embodiment of the present application, the second pipeline 120 is used to introduce part of the coke oven flue gas generated by the coke oven into the dry quenching circulating gas circuit 100. The specific location where the coke oven flue gas is introduced into the dry quenching circulating gas circuit 100 can be reasonably selected based on parameters such as the coke oven flue gas temperature. This article shows that the second pipeline 120 is connected between the heat exchanger and the dry quenching blower 105. The temperature of the circulating gas at this location is not much different from the temperature of the coke oven flue gas (approximately the same), which will not cause excessive fluctuations in the flue gas. The coupling system also includes a first flow valve 111 and a second flow valve 121. The first flow valve 111 is provided on the first pipeline and is used to adjust the flow of the circulating gas drawn out from the dry quenching circulating gas circuit 100; the second flow valve 121 is provided on the second pipeline 120 and is used to adjust the flow of the coke oven flue gas introduced into the dry quenching furnace 101.

[0059] The present application also provides a control method for a coupled system of a coke oven system 200 and a CDQ circulating gas loop 100, comprising:

[0060] detecting a first operating parameter of the CDQ circulating gas circuit 100 and a second operating parameter of the coke oven system 200, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters;

[0061] Specifically, the working parameters can be obtained by a detection module installed at a corresponding position. The detection module can include a temperature sensor, a pressure sensor, a concentration sensor, a wind speed sensor, etc. to obtain the corresponding working parameters.

[0062] The opening of the first flow valve 111 and the opening of the second flow valve 121 are adjusted according to the detected first operating parameter and second operating parameter, so that the first operating parameter is within the first target range, and / or the second operating parameter is within the second target range.

[0063] Specifically, the coupling system includes a controller, which controls the opening of the first flow valve 111 and the second flow valve 121 according to the parameters detected by the detection module.

[0064] The first target range is a preset value for one or more parameters that can satisfy the preset operating conditions of the coke oven system 200, and this can be pre-set within the controller. Similarly, the second target range is a preset value for one or more parameters that can satisfy the preset operating conditions of the CDQ circulating gas circuit 100, and this can also be pre-set within the controller.

[0065] When the circulating gas in the CDQ recirculating gas loop 100 exceeds a preset amount, a portion of the excess circulating gas from the CDQ furnace 101 can be directed through the first pipeline into the coke oven to control the concentration of combustible components in the CDQ recirculating gas and reduce the risk of gas leakage and explosion in the CDQ furnace 101. The recirculating gas directed from the CDQ recirculating gas loop 100, which contains combustible components, can be mixed with the coal gas entering the coke oven and used as fuel for heating the coke oven. Furthermore, the inert components in the recirculating gas dilute the combustible components in the coke oven gas, reducing the combustion intensity of the coke oven gas and reducing the generation of NOx in the coke oven exhaust gas. Furthermore, a portion of the exhaust gas from the coke oven can be directed through the second pipeline 120 into the CDQ recirculating gas loop 100 to serve as inert gas for CDQ and as a source of pressure-stabilized gas for the CDQ recirculating gas loop 100. The excess air in the coke oven exhaust gas can also serve as a combustion-supporting gas, reacting with the combustible components in the gas in the CDQ recirculating gas loop 100 to reduce the combustible gas components. The remaining coke oven waste flue gas can be treated by flue gas purification device 2-1 (desulfurization and denitrification system purification and waste heat recovery system recovery of part of the sensible heat) and then discharged through the coke oven chimney.

[0066] In the embodiment of the present application, the coke oven system 200 is coupled with the dry coke quenching circulating gas loop 100 for coordinated processing, and part of the flue gas generated by the coke oven is used as an inert gas introduced for dry coke quenching, and excess air in the coke oven flue gas is used as a combustion-supporting gas for the circulating gas, without the need to introduce fresh air, in which the oxygen content is lower than that of fresh air and the reaction intensity with the combustible gas is low, thereby avoiding high-temperature accidents inside the circulating gas, reducing the burnout of red coke, and facilitating the safe operation of the equipment and environmental protection; at the same time, part of the coke oven flue gas generated by the coke oven is used as an inert gas introduced into the dry coke quenching circulating gas loop 100, which can reduce the capacity of the flue gas purification device 2-1 in the coke oven system 200; using the coke oven flue gas as an inert gas introduced for dry coke quenching reduces the amount of nitrogen supplemented in the circulating gas in the dry coke quenching circulating loop 100, thereby reducing the nitrogen manufacturing cost. Furthermore, the circulating gas (circulating gas) derived from the CDQ circulating gas loop 100 can be mixed with coal gas and used as fuel for heating the coke oven, thereby making full use of the combustible gas components such as CO, CH4, and H2 in the circulating gas, which is beneficial to energy conservation and consumption reduction, avoids direct emission pollution to the atmosphere, and reduces the investment in a series of equipment for pollutant treatment; the inert gas contained in the circulating gas plays a role in diluting the combustible gas, which can improve the flame shape and combustion uniformity, regulate the combustion intensity and stability, and is beneficial to the thermal regulation of the coke oven, reduce energy consumption, and reduce pollutants at the source.

[0067] Alternatively, in the embodiment of the present application, when the circulating gas in the CDQ circulating gas loop 100 exceeds a preset amount, a portion of the excess circulating gas from the CDQ furnace 101 can be directly guided from the first pipeline to the coke oven flue gas pipeline. In this way, the flue gas can be processed by the flue gas purification device 2-1 of the coke oven system 200, thereby reducing the purification equipment capacity of the dust removal system in the CDQ circulating gas loop 100 and reducing the redundancy and complexity of the pipeline layout in the CDQ area.

[0068] In addition, through the automatic control of the system, the balance and stability of the pressure and gas components in the two systems can be achieved. Compared with the traditional two independent control schemes, the energy consumption of the system operation is reduced and the degree of system automation operation is improved.

[0069] In this embodiment of the present application, the coke oven system 200 may further include a mixer 113 and a gas inlet pipeline. The end of pipeline 110 remote from the CDQ circulating gas circuit 100 and the gas inlet pipeline are both connected to the mixer 113. The gas outlet of the mixer 113 is connected to the gas inlet of the coke oven. This allows the circulating gas to be thoroughly mixed with the gas in the mixer 113, and the mixed gas is then introduced into the coke oven, which helps improve combustion uniformity.

[0070] In a specific embodiment, a first flow valve 111 is provided on pipeline 110, one end of which is connected to the downstream pipeline of the secondary dust collector 104. Specifically, one end of pipeline 110 can be connected to the pipe section between the secondary dust collector 104 and the CDQ blower 105. In this way, the high-temperature circulating gas flowing out of the CDQ furnace 101 is cooled after heat exchange in the CDQ boiler 103. The circulating gas flowing out of the CDQ boiler 103 is purified after dust removal in the secondary dust collector 104. Part of the purified circulating gas can flow into the coke oven system 200 along the first pipeline. This eliminates the need for purification components in the first pipeline, further reducing the cost of the coupled system.

[0071] In order to improve the smoothness of gas flow in the first pipeline and the second pipeline 120, the coupling system of the present application also has the following settings.

[0072] The coupling system of the present application further includes a variable frequency induced draft fan 112, which is arranged in pipeline 110; the variable frequency induced draft fan 112 is located in the upstream pipeline of the mixer 113; the induced draft fan 112 is used to provide flow power for the circulating gas in the first pipeline.

[0073] The coupling system of the present application further includes a variable frequency blower 122 , which is disposed in the second pipeline 120 . The blower 122 is used to provide flow power for the smoke in the second pipeline 120 .

[0074] The control method adjusts the openings of the first flow valve 111 and the second flow valve 121 while also adjusting the speeds of the variable-frequency induced draft fan 112 and the variable-frequency supplied draft fan 122, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range. This control method provides rapid adjustment speed.

[0075] Similarly, the CDQ fan 105 is arranged between the secondary dust collector 104 and the flue gas inlet of the CDQ furnace 101. The CDQ fan 105 is used to provide flow power for the circulating flue gas in the CDQ circulating gas loop 100; the other end of the second pipeline 120 is connected downstream of the CDQ fan 105.

[0076] Furthermore, the CDQ circulating gas loop 100 also includes a heat exchanger 106 for cooling the gas flowing into the CDQ furnace 101. A second pipeline 120 connects to the pipeline upstream of heat exchanger 106. The coke oven flue gas flowing from second pipeline 120 mixes with the circulating gas in the CDQ circulating gas loop 100 and then flows through heat exchanger 106, exchanging heat with the desalted water flowing into the CDQ boiler 103. This heats the desalted water to the desired temperature, facilitating steam generation in the CDQ boiler 103. A deaerator 107 is also provided on the desalted water pipeline.

[0077] In a specific embodiment, one end of the second pipeline 120 is connected to the connecting pipeline between the flue gas outlet of the coke oven and the flue gas purification device 2-1, where the flue gas temperature is relatively high. The coupled system also includes a second pipeline 130 and a third flow valve 131. One end of the second pipeline 130 is connected to the first pipeline, and the other end of the second pipeline 130 is connected to the flue gas inlet of the flue gas purification device 2-1. Some or all of the circulating gas in the first pipeline can be directly fed along the second pipeline 130 into the flue gas purification device 2-1 of the coke oven system 200 for treatment. This reduces the purification equipment capacity of the dust removal system in the CDQ circulating gas circuit 100 and reduces the redundancy and complexity of the piping layout in the CDQ area.

[0078] This application also provides a control method, including:

[0079] detecting a first operating parameter of the CDQ circulating gas circuit 100 and a second operating parameter of the coke oven system 200, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters;

[0080] The openings of the first flow valve 111 , the second flow valve 121 and the third flow valve 131 are adjusted according to the detected first operating parameter and the second operating parameter so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

[0081] When a variable frequency induced draft fan 112 is provided on the first pipeline and a variable frequency supply fan 122 is provided on the second pipeline 120; the above control method adjusts the opening of the first flow valve 111, the second flow valve 121 and the third flow valve 131, while also adjusting the speed of the variable frequency induced draft fan 112 and the speed of the variable frequency supply fan 122 at the same time, so that the first working parameter is within the first target range and the second working parameter is within the second target range, so as to achieve rapid adjustment.

[0082] The above describes a specific embodiment in which the coupling system is provided with both the first pipeline and the second pipeline 120. In other embodiments, the coupling system may also be provided with only the first pipeline or the second pipeline 120, which also has further technical effects compared to the prior art. Figure 2 2 shows a specific example in which the coupling system is provided with only the second pipeline 120. The other structures of the coke quenching circulating gas circuit 100 and the coke oven system 200 are substantially the same as those described in the above embodiment and will not be described in detail here.

[0083] In the description of the embodiments of the present application, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0084] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A coupling system of a coke oven system and a dry quenching coke circulating gas circuit, characterized in that: include: CDQ cycle gas loop, including CDQ furnace; Coke oven systems, including coke ovens; a first pipeline and a first flow valve, wherein the first pipeline is used to introduce part of the circulating gas generated by the dry quenching furnace into the interior of the coke oven or / and the coke oven flue gas pipeline of the coke oven system; The first flow valve is provided on the first pipeline and is used to adjust the flow of the circulating gas in the first pipeline.

2. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 1, characterized in that: Also includes: a second pipeline and a second flow valve, wherein the second pipeline is used to introduce part of the coke oven flue gas generated by the coke oven into the dry quenching circulating gas loop; The second flow valve is provided in the second pipeline and is used to adjust the flow of the coke oven flue gas in the second pipeline.

3. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 2, characterized in that: The coke oven system also includes a mixer and a gas inlet pipeline. The first pipeline includes pipeline 1. The first flow valve is arranged on pipeline 1. The end of pipeline 1 away from the dry quenching circulating gas loop and the gas inlet pipeline are both connected to the mixer. The gas outlet of the mixer is connected to the gas inlet of the coke oven.

4. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 3, characterized in that: The dry quenching circulating gas loop also includes a dry quenching boiler and a secondary dust collector. Along the fluid flow direction in the dry quenching circulating gas loop, the dry quenching furnace, the dry quenching boiler and the secondary dust collector are connected in sequence through pipelines, and the pipeline 1 is connected to the downstream pipeline of the secondary dust collector.

5. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 4, characterized in that: The CDQ circulating gas loop also includes a CDQ fan and a heat exchanger. The CDQ fan and the heat exchanger are sequentially arranged between the secondary dust collector and the flue gas inlet of the CDQ furnace. The CDQ fan is used to provide flow power for the circulating gas in the CDQ circulating gas loop; the heat exchanger is used to exchange heat between the circulating gas in the CDQ circulating gas loop and the desalted water flowing into the CDQ boiler; the other end of the second pipeline is connected to the pipeline between the CDQ fan and the heat exchanger.

6. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 3, characterized in that: It also includes a variable frequency induced draft fan, which is arranged in the first pipeline; the variable frequency induced draft fan is located in the upstream pipeline of the mixer; the variable frequency induced draft fan is used to provide flow power for the circulating gas in the first pipeline; Alternatively or additionally, further comprising a variable frequency blower, disposed in the second pipeline, the variable frequency blower being used to provide flow power for the coke oven flue gas in the second pipeline; Alternatively, or / and, the coke oven system further comprises a flue gas purification device, which is connected downstream of the flue gas outlet of the coke oven, and one end of the second pipeline is connected to the connecting pipeline between the flue gas outlet of the coke oven and the flue gas purification device.

7. The coupling system of a coke oven system and a dry quenching gas circuit according to any one of claims 3 to 6, characterized in that: The coke oven system further comprises a flue gas purification device, which is connected downstream of the flue gas outlet of the coke oven. The first pipeline also includes a pipeline 2, which is provided with a third flow valve. One end of the pipeline 2 is connected to the pipe section of the pipeline 1 located upstream of the mixer, and the other end is connected to the flue gas inlet of the flue gas purification device.

8. The coupling system of the coke oven system and the CDQ circulating gas circuit according to claim 7, characterized in that: Also includes: a detection module, configured to detect a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters; The controller adjusts the openings of the first flow valve, the second flow valve and the third flow valve according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

9. A coupling system of a coke oven system and a dry quenching coke circulating gas circuit, characterized in that: include: CDQ cycle gas loop, including CDQ furnace; Coke oven systems, including coke ovens; a second pipeline and a second flow valve, wherein the second pipeline is used to introduce part of the coke oven flue gas generated by the coke oven into the interior of the dry quenching furnace; The second flow valve is provided in the second pipeline and is used to adjust the flow of the coke oven flue gas in the second pipeline.

10. A control method for a coupled system of a coke oven system and a dry quenching gas loop according to any one of claims 2 to 6, characterized in that: The control method includes: detecting a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters; The openings of the first flow valve and the second flow valve are adjusted according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

11. The control method according to claim 10, characterized in that: A variable frequency induced draft fan is provided on the first pipeline, and a variable frequency supply fan is provided on the second pipeline; the control method adjusts the opening of the first flow valve and the second flow valve while also adjusting the rotation speed of the variable frequency induced draft fan and the rotation speed of the variable frequency supply fan, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

12. A control method for a coupled system of a coke oven system and a dry quenching gas loop according to claim 7 or 8, characterized in that: The control method includes: detecting a first operating parameter of the CDQ circulating gas circuit and a second operating parameter of the coke oven system, wherein the first operating parameter includes at least one of temperature, pressure, gas composition, combustible gas component concentration, or circulating air volume at a predetermined location; and the second operating parameter includes one or more of coke oven flue gas temperature, coke oven flue gas pressure, coke oven flue gas excess air coefficient, or coke oven operating parameters; The openings of the first flow valve, the second flow valve and the third flow valve are adjusted according to the detected first operating parameter and the second operating parameter, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

13. The control method according to claim 12, characterized in that: A variable frequency induced draft fan is provided on the first pipeline, and a variable frequency supply fan is provided on the second pipeline; the control method adjusts the openings of the first flow valve, the second flow valve and the third flow valve while also adjusting the rotation speed of the variable frequency induced draft fan and the rotation speed of the variable frequency supply fan, so that the first operating parameter is within a first target range and the second operating parameter is within a second target range.

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