Dry quenching system and dry quenching control method
By introducing air into the preset section of the high-temperature heat exchanger of the dry coke quenching system, the carbon monoxide gas concentration is reduced, and coke burning is reduced by limiting the temperature range, the problem of difficult to reduce the carbon monoxide gas concentration and high coke burning rate in the existing dry coke quenching process is solved, and the coordinated control of a variety of pollutants is achieved.
Patent Information
- Application Number
- CN202411817976.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-03-28
AI Technical Summary
The existing dry coke quenching process has coke burning, which makes it difficult to reduce the concentration of carbon monoxide gas in the circulating gas, and the coke burning rate is high, affecting the realization of environmental protection goals.
A dry coke quenching system is designed to reduce the concentration of carbon monoxide by introducing air in the preset section of the high-temperature heat exchanger, and reduce coke burning by limiting the temperature range of air introduction.
It effectively reduces the concentration of carbon monoxide gas in the dry quenching circulation gas, reduces the burning of coke, and thus reduces the generation of sulfides, achieving coordinated control of multiple pollutants.
Smart Images
Figure CN119709224A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ferrous metallurgy, and in particular to a coke dry quenching system and a coke dry quenching control method. Background Art
[0002] CDQ technology originated in Switzerland. As the country attaches great importance to environmental protection, ultra-low emissions are being promoted in the coking industry, and sulfide and particulate matter emission requirements have been put forward for CDQ. Local governments in key areas of air pollution prevention and control have even put forward carbon monoxide control indicators. In order to meet more stringent environmental protection requirements, the CDQ process needs to further improve its own technology.
[0003] The main component of CDQ circulating gas is nitrogen, and it also contains carbon dioxide, carbon monoxide, hydrogen, water vapor, etc. In order to reduce the concentration of combustible components in the circulating gas, air is generally introduced at the top of the annular flue of the CDQ oven. In order to maintain the pressure balance in the system, part of the circulating gas is generally released in the auxiliary economizer.
[0004] At present, the CDQ process generally suffers from the phenomenon of coke burning. Not only does the sulfide in the circulating gas mainly come from coke burning, but carbon monoxide also mainly comes from coke burning. The main measure currently used to control coke burning is to increase the concentration of carbon monoxide gas in the circulating gas. When the concentration of carbon monoxide gas in the circulating gas is kept at a low level, the coke burning rate will be greatly increased. How to synergistically reduce the concentration of carbon monoxide gas in the CDQ circulating gas and the coke burning of the CDQ process is the key research direction of CDQ in the future. Summary of the invention
[0005] In order to solve the above problems, the present application provides a coke dry quenching system and a coke dry quenching control method.
[0006] The present application provides a dry coke quenching system, comprising a dry coke quenching oven, an air duct and an air introduction device. The dry coke quenching oven is provided with a gas inlet and a gas outlet. The air duct is used for the circulation of dry coke quenching circulating gas. Both ends of the air duct are respectively connected with the gas inlet and the gas outlet. A high-temperature heat exchanger, a low-temperature heat exchanger and a circulating fan are installed in the air duct along the circulation direction of the circulating gas. The air path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger is provided with a preset section. The temperature of the circulating gas when flowing through the preset section is 600° C. to 800° C. The air introduction device is provided with at least one air introduction port connected with the preset section. The air introduction device is used to introduce air into the preset section through the air introduction port when the dry coke quenching system is in operation.
[0007] In some embodiments, the air introduction device comprises:
[0008] At least two air introduction pipes are installed in the high-temperature heat exchanger. The at least two air introduction pipes are arranged front and back according to the flow direction of the gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger. The air introduction pipes are provided with gas ports, which are connected to the gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger.
[0009] At least two first regulating valves, each air inlet pipe is equipped with at least one first regulating valve;
[0010] At least two temperature measuring components, at least one temperature measuring component is installed on each air introduction pipe, and the temperature measuring component is used to detect the temperature of the dry coke quenching circulating gas at a position directly opposite to the gas port when the dry coke quenching system is running, so as to determine the gas port belonging to the air introduction port;
[0011] The air driving mechanism is connected to at least two air introduction pipes and is used to introduce air into the air path for the circulation of the dry quenching circulating gas in the high-temperature heat exchanger through the air port belonging to the air introduction port when the dry quenching system is running.
[0012] In some embodiments, the air introduction device comprises:
[0013] A main pipe, one end of which is connected to at least two air introduction pipes, and the other end of which is connected to the air driving mechanism;
[0014] Main regulating valve, installed in the main pipe;
[0015] Blower, as opposed to air driven mechanism;
[0016] A branch pipe, one end of which is connected to the blower, and the other end of which is connected to the main pipe and is connected between the air inlet pipe and the main regulating valve;
[0017] The second regulating valve is installed in the branch pipe.
[0018] In some embodiments, the air introduction tube comprises:
[0019] The annular pipe portion is provided with a plurality of gas ports, which are arranged in sequence and at intervals along the annular shape of the annular pipe portion, and the distribution surface of the annular pipe portion is a cross section of a gas path for circulating gas for dry quenching in the high-temperature heat exchanger that intersects with the flow direction;
[0020] The main pipe part has one end communicated with the annular pipe part and the other end connected with the air driving mechanism. At least one first regulating valve is installed in the main pipe part.
[0021] In some embodiments, the preset section defines that the temperature of the CDQ circulating gas entering the preset section when the CDQ system is in operation is in the range of 650°C to 700°C.
[0022] In some embodiments, the dry quenching system comprises:
[0023] The gas composition detection component is installed in the gas duct and is located after the high-temperature heat exchanger along the flow direction of the circulating gas, and is used to detect the carbon monoxide gas concentration in the gas duct.
[0024] In some embodiments, the dry quenching system comprises:
[0025] The controller is connected to the gas composition detection component signal and is control-connected to the air introduction device. It is used to control the operation of the air introduction device to introduce air into a preset section through the air introduction port when the carbon monoxide gas concentration in the airway detected by the gas composition detection component is above a set value. The set value includes but is not limited to 1%.
[0026] In some embodiments, the air duct is also equipped with a first dust collector and a second dust collector, and the first dust collector, the high-temperature heat exchanger, the second dust collector, the circulating fan and the low-temperature heat exchanger are arranged in sequence along the airflow direction of the air duct.
[0027] A coke dry quenching control method, using the above coke dry quenching system, the coke dry quenching system includes a gas composition detection component, the gas composition detection component is installed in the gas channel and is located after the high-temperature heat exchanger along the gas flow direction of the gas channel, and the gas composition detection component is used to detect the carbon monoxide gas concentration in the gas channel;
[0028] CDQ control methods include:
[0029] Obtaining the carbon monoxide gas concentration in the airway detected by the gas composition detection element;
[0030] When the carbon monoxide gas concentration in the airway detected by the gas component detection element is greater than a set value, the air introduction device enters an operating state to introduce air into the preset section through the air introduction port;
[0031] When the carbon monoxide gas concentration in the airway detected by the gas component detection device drops below a set value, the air introduction device is adjusted down to reduce the amount of air introduced per unit time or the air introduction device is stopped.
[0032] In some embodiments, the coke dry quenching control method includes:
[0033] After the air introduction device enters the operating state, when the carbon monoxide gas concentration in the airway detected by the gas composition detection component continues to decrease and is greater than the set value, the air introduction device is adjusted down to reduce the amount of air introduced per unit time.
[0034] The application has the following beneficial effects: a dry coke quenching system is provided, comprising a dry coke quenching oven, an air duct and an air introduction device, wherein both ends of the air duct are respectively connected to the dry coke quenching oven, the air duct is used for the circulation of dry coke quenching circulating gas, a high-temperature heat exchanger, a low-temperature heat exchanger and a circulating fan are installed in the air duct, and air is introduced into the circulating gas through the air introduction device; specifically, the air introduction device is installed in the high-temperature heat exchanger, and the position of the preset section in the high-temperature heat exchanger is determined. When the dry coke quenching system is running, the circulating gas runs from the dry coke quenching oven along the air duct to the preset section of the high-temperature heat exchanger, and the temperature of the circulating gas is within the range of 600°C to 800°C. The air introduction device introduces a proper amount of air into the preset section through the air introduction port, and the temperature of the circulating gas is within the range of 600°C to 800°C. Under the above conditions, oxygen in the air reacts with carbon monoxide in the circulating gas, so that the concentration of carbon monoxide in the circulating gas is reduced, and the removal rate of carbon monoxide is guaranteed by limiting the temperature of the preset section area for introducing air to above 600°C. By limiting the temperature of the preset section area for introducing air to below 800°C, the problem of aggravated coke powder burning due to a large degree of reaction between coke powder and water vapor and a large degree of reaction between coke powder and carbon dioxide gas when the temperature is higher than 800°C is improved. In summary, the dry coke quenching system provided in the present application can not only reduce the concentration of carbon monoxide in the circulating gas, but also reduce coke burning. By reducing coke burning, the generation of sulfides in the dry coke quenching system can be reduced, thereby realizing coordinated control of multiple pollutants. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.
[0036] Figure 1 A schematic diagram of the structure of a coke dry quenching system provided in this application;
[0037] Figure 2 A schematic diagram of the operation of a dry coke quenching system provided in this application;
[0038] Figure 3 A front view of an air introduction device in a dry coke quenching system provided in the present application;
[0039] Figure 4 A top view of an air introduction device in a dry coke quenching system provided in the present application.
[0040] Figure markings: 1-coke dry quenching oven, 11-cooling section, 111-air supply device, 12-incline area, 13-pre-storage section, 14-annular flue, 2-air duct, 21-first dust collector, 22-high temperature heat exchanger, 221-preset section, 23-second dust collector, 24-circulating fan, 25-low temperature heat exchanger, 3-air introduction device, 31-air introduction pipe, 311-annular pipe part, 3111-air port, 31111-air introduction port, 312-main pipe part, 32-first regulating valve, 33-temperature measuring part, 34-air driving mechanism, 35-main pipe, 36-main regulating valve, 37-blower, 38-branch pipe, 39-second regulating valve, 4-gas composition detection part. DETAILED DESCRIPTION
[0041] In the prior art, the circulating gas is used as the heat exchange medium of the CDQ system. It directly exchanges heat with the high-temperature coke in the reverse direction in the CDQ oven. The circulating gas that has absorbed the heat of the coke exchanges heat indirectly with water or water vapor in the waste heat boiler. The main component of the CDQ circulating gas is nitrogen, and it also contains carbon dioxide gas, carbon monoxide gas, hydrogen, etc. In order to reduce the concentration of combustible components in the circulating gas, the combustible gases in the circulating gas are mainly carbon monoxide gas and hydrogen. Air is generally introduced at the top of the annular flue of the CDQ oven. At the same time, in order to maintain the pressure balance in the CDQ system, part of the circulating gas is generally released in the low-temperature heat exchanger. The low-temperature heat exchanger is generally a sub-economizer, and the released circulating gas is called released gas.
[0042] In the prior art, the concentration of carbon monoxide in the CDQ circulating gas is controlled within a range of 1% to 6%, so the concentration of carbon monoxide in the vented gas is also within a range of 1% to 6%. Not only do sulfides in the circulating gas mainly come from coke burnout, but carbon monoxide also mainly comes from coke burnout. Coke burnout is common in the current CDQ process, and the design value of the coke burnout rate is generally between 0.9% and 1.0%. However, the coke burnout rate of many units is higher than the design value, even reaching more than 2%.
[0043] Please refer to Figure 1The present application discloses a dry coke quenching system, which includes a dry coke quenching oven 1. The dry coke quenching oven 1 includes a relative pre-storage section 13, a chute area 12, a cooling section 11 and an annular flue 14. The pre-storage section 13, the chute area 12 and the cooling section 11 are arranged in sequence from top to bottom. High-temperature coke runs along the pre-storage section 13, the chute area 12 and the cooling section 11 in sequence. The annular flue 14 is connected to the chute area 12. The dry coke quenching oven 1 has a gas inlet and a gas outlet. The gas outlet is an outlet provided by the annular flue 14 for circulating gas. A gas supply device 111 is installed at the bottom of the cooling section 11. The circulating gas is provided to the cooling section 11 through the gas supply device 111. The gas inlet is an inlet provided by the gas supply device 111 for circulating gas. The circulating gas contacts and exchanges heat with the high-temperature coke in the cooling section 11, and the high-temperature coke is cooled. The circulating gas absorbs heat and is discharged from the annular flue 14.
[0044] Please refer to Figure 1 and Figure 2 The dry coke quenching system includes an airway 2, which is used for circulating gas for dry coke quenching. The two ends of the airway 2 are respectively connected to the annular flue 14 and the gas supply device 111. Specifically, one end of the airway 2 is connected to the outlet of the circulating gas of the annular flue 14, and the other end of the airway 2 is connected to the inlet of the circulating gas of the gas supply device 111. A circulating fan 24 is installed in the airway 2, and the circulating fan 24 provides power for circulating the circulating gas.
[0045] Please refer to Figure 1 , a high temperature heat exchanger 22 and a low temperature heat exchanger 25 are installed in the gas passage 2. Please refer to Figure 2 The high-temperature heat exchanger 22 is arranged before the low-temperature heat exchanger 25 along the circulating gas flow direction in the gas channel 2. When the CDQ system is running, the circulating gas first passes through the high-temperature heat exchanger 22 and then passes through the low-temperature heat exchanger 25. The high-temperature heat exchanger 22 and the low-temperature heat exchanger 25 are two different heat exchangers working in different temperature ranges. The high-temperature heat exchanger 22 is used in high-temperature fields, and the general temperature range is above 400°C. The high-temperature heat exchanger 22 includes but is not limited to a boiler. In the CDQ system, the low-temperature heat exchanger 25 works in the range of 200°C to 400°C, and the low-temperature heat exchanger 25 includes but is not limited to a sub-economizer.
[0046] In the dry quenching system disclosed in the present invention, please refer to Figure 1 The air introduction device 3 is installed on the high-temperature heat exchanger 22. The high-temperature heat exchanger 22 has a gas path for the circulation of the dry coke quenching circulating gas. The gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22 includes a preset section 221 and other areas outside the preset section 221. When the dry coke quenching system is running, the temperature of the dry coke quenching circulating gas entering the preset section 221 is within the range of 600°C to 800°C.
[0047] Therefore, at least one air inlet 31111 is provided in the air introduction device 3, and the air inlet 31111 is connected to the preset section 221. When the dry coke quenching system is in operation, a proper amount of air is introduced into the preset section 221 of the high-temperature heat exchanger 22 through the air introduction device 3 through the air introduction port 31111, and the oxygen in the air reacts with the carbon monoxide in the circulating gas under the temperature condition of 600° C. to 800° C., so that the concentration of carbon monoxide in the circulating gas is reduced.
[0048] When the reaction temperature of oxygen in the air and carbon monoxide in the circulating gas is below 600°C, the reaction rate of oxygen in the air and carbon monoxide in the circulating gas is slow due to the low concentration of carbon monoxide in the circulating gas. In the dry coke quenching system of the present disclosure, the temperature of the preset section 221 region where air is introduced is limited to above 600°C, thereby ensuring the removal rate of carbon monoxide in the circulating gas.
[0049] When the reaction temperature of oxygen in the air and carbon monoxide in the circulating gas is higher than 800°C, coke powder will react with water vapor to a greater extent, and coke powder will react with carbon dioxide gas to a greater extent, causing the coke powder to burn more severely. In the dry coke quenching system of the present disclosure, by limiting the temperature of the preset section 221 area where air is introduced to be below 800°C, the problem of coke powder burning more severely due to the large degree of reaction between coke powder and water vapor and the large degree of reaction between coke powder and carbon dioxide when the temperature is higher than 800°C is improved.
[0050] In summary, the CDQ system disclosed in the present invention can not only reduce the carbon monoxide gas concentration in the circulating gas during operation, but also reduce coke burning loss. By reducing coke burning loss, the generation of sulfides in the CDQ system can be reduced, thereby achieving coordinated control of multiple pollutants.
[0051] Please refer to Figure 1 The high temperature heat exchanger 22, the circulating fan 24 and the low temperature heat exchanger 25 are sequentially arranged along the airflow direction of the air duct 2. In some embodiments, the circulating fan 24 may be arranged after the low temperature heat exchanger 25 along the airflow direction of the air duct 2.
[0052] In some embodiments, see Figure 1 The air duct 2 is also equipped with a first dust collector 21 and a second dust collector 23. The first dust collector 21, the high-temperature heat exchanger 22, the second dust collector 23, the circulating fan 24 and the low-temperature heat exchanger 25 are sequentially arranged along the airflow direction of the air duct 2. The first dust collector 21 performs the first dust removal on the circulating gas, and the second dust collector 23 performs the second dust removal on the circulating gas.
[0053] In some embodiments, the preset section 221 limits the temperature of the coke quenching circulating gas entering the preset section 221 when the coke quenching system is in operation to be within the range of 650°C to 700°C. Under the temperature condition of 650°C to 700°C, the oxygen in the air reacts with the carbon monoxide in the circulating gas, so that the concentration of carbon monoxide in the circulating gas is reduced. Compared with the scheme in which the temperature of the preset section 221 region where air is introduced during operation of the coke quenching system of the present disclosure is 700°C to 800°C, by limiting the temperature of the preset section 221 region where air is introduced during operation of the coke quenching system of the present disclosure to be below 700°C, the reaction degree of coke powder with water vapor and the reaction degree of coke powder with carbon dioxide gas are significantly reduced, and the problem of coke powder burning is further improved. Compared with the temperature of the preset section 221 region where air is introduced during operation of the coke quenching system of the present disclosure to be within the range of 600°C to 650°C, by limiting the temperature of the preset section 221 region where air is introduced during operation of the coke quenching system of the present disclosure to be above 650°C, the removal rate of carbon monoxide in the circulating gas is further guaranteed.
[0054] In some embodiments, please refer to Figures 2 to 4 The air introduction device 3 includes at least two air introduction pipes 31, at least two first regulating valves 32, at least two temperature measuring components 33 and an air driving mechanism 34. Since the operating state of the dry coke quenching system may change, such as the maintenance state, and the operating power of the circulating fan 24 changes, the air introduction device 3 is arranged in multiple layers through at least two air introduction pipes 31, which expands the arrangement space of the air introduction device 3 in the high-temperature heat exchanger 22, and determines a certain air introduction pipe 31 in the preset section 221 when the dry coke quenching system is running through the temperature measuring component 33.
[0055] Specifically, at least two air introduction pipes 31 are installed in the high-temperature heat exchanger 22, and at least two air introduction pipes 31 are arranged front and back according to the flow direction of the gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22. At least two air introduction pipes 31 are arranged in sequence along the flow direction of the gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22. The air introduction pipes 31 are all provided with gas ports 3111, and the gas ports 3111 are connected to the gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22. At least one first regulating valve 32 is installed in each air introduction pipe 31. At least one temperature measuring component 33 is installed in each air introduction pipe 31, and the temperature measuring component 33 is used to detect the temperature of the dry coke quenching circulating gas at a position directly opposite to the gas port 3111 when the dry coke quenching system is running, so as to determine the gas port 3111 belonging to the air introduction port 31111. The air driving mechanism 34 is connected to at least two air inlet pipes 31 , and is used to introduce air into the air path of the high-temperature heat exchanger 22 through the air port 3111 belonging to the air inlet port 31111 when the dry coke quenching system is running.
[0056] When the CDQ system is running, the temperature of the CDQ circulating gas at the position opposite to the air port 3111 of each air inlet pipe 31 is detected by the temperature measuring component 33. When the temperature of the CDQ circulating gas at the position opposite to the air port 3111 of a certain air inlet pipe 31 is within a preset range, which includes but is not limited to 600°C to 800°C and 650°C to 700°C, the air port 3111 of the air inlet pipe 31 is determined to be the air inlet 31111, and the first regulating valve 32 of the air inlet pipe 31 where the air inlet 31111 is located is opened, and an appropriate amount of air is introduced into the air path for the circulation of the CDQ circulating gas in the high-temperature heat exchanger 22 through the air port 3111 serving as the air inlet 31111 through the air driving mechanism 34.
[0057] In some embodiments, see Figures 2 to 4 The air introduction device 3 includes a main pipe 35, a main regulating valve 36, a blower 37, a branch pipe 38 and a second regulating valve 39. One end of the main pipe 35 is connected to at least two air introduction pipes 31, and the other end of the main pipe 35 is connected to the air driving mechanism 34. The main regulating valve 36 is installed in the main pipe 35. The blower 37 is opposite to the air driving mechanism 34. One end of the branch pipe 38 is connected to the blower 37, and the other end of the branch pipe 38 is connected to the main pipe 35 and connected between the air introduction pipe 31 and the main regulating valve 36. The second regulating valve 39 is installed in the branch pipe 38. When the main regulating valve 36 is opened and the second regulating valve 39 is closed, the air driving mechanism 34 operates to introduce air into the air introduction pipe 31. When the main regulating valve 36 is closed and the second regulating valve 39 is opened, the blower 37 is started to blow air to the high-temperature heat exchanger 22 through the air introduction pipe 31, thereby increasing the amount of air entering the high-temperature heat exchanger 22.
[0058] In some embodiments, see Figure 1 The dry coke quenching system includes a gas composition detection device 4, which is installed in the airway 2. The gas composition detection device 4 detects the carbon monoxide gas concentration in the airway 2, and uses the detected carbon monoxide gas concentration in the airway 2 as a judgment condition for the operation of the air introduction device 3. When the carbon monoxide gas concentration in the airway 2 drops below the set value, the air is stopped from being introduced into the preset section 221.
[0059] Regarding the installation position of the gas composition detection device 4, the gas composition detection device 4 is arranged after the high-temperature heat exchanger 22 along the gas flow direction of the airway 2, and the gas composition detection device 4 along the gas flow direction of the airway 2 can be arranged before the low-temperature heat exchanger 25, after the low-temperature heat exchanger 25 or at the position of the low-temperature heat exchanger 25. Figure 1The scheme in which the gas composition detection element 4 is arranged before the low-temperature heat exchanger 25 along the gas flow direction of the gas channel 2 is shown. When the gas composition detection element 4 is arranged at the position of the low-temperature heat exchanger 25, specifically at the discharge port of the low-temperature heat exchanger 25, the part of the circulating gas discharged from the discharge port is called the discharged gas.
[0060] In some embodiments, see Figure 4 The air introduction pipe 31 includes an annular pipe portion 311 and a main pipe portion 312. One end of the main pipe portion 312 is connected to the annular pipe portion 311, and the other end of the main pipe portion 312 is connected to the air driving mechanism 34. At least one first regulating valve 32 is installed in the main pipe portion 312, and the main pipe portion 312 is controlled to be on and off by the first regulating valve 32. The annular pipe portion 311 is provided with a plurality of air ports 3111, and the plurality of air ports 3111 are sequentially arranged along the annular ring of the annular pipe portion 311. The distribution surface of the annular pipe portion 311 is a cross section of the air path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22 that intersects with the flow direction. In some embodiments, the air path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger 22 is arranged vertically and the distribution surface of the annular pipe portion 311 is arranged horizontally. When the air driving mechanism 34 is in operation, air is introduced into the air introduction pipe 31, and is introduced into the preset section 221 of the high-temperature heat exchanger 22 through the plurality of air ports 3111 of the air introduction pipe 31.
[0061] In some embodiments, the dry coke quenching system includes a controller, and the dry coke quenching system is automatically adjusted by the controller. The controller is connected to the gas composition detection element 4 by signal, and the controller is connected to the air introduction device 3 by control. The gas composition detection element 4 detects the carbon monoxide gas concentration in the gas after passing through the high-temperature heat exchanger 22 in the airway 2. The controller obtains the detection signal of the gas composition detection element 4. When it is determined that the carbon monoxide gas concentration is above the set value, the controller controls the air introduction device 3 to operate, and introduces air into the preset section 221 through the air introduction port 31111 until the carbon monoxide gas concentration in the gas after passing through the high-temperature heat exchanger 22 in the airway 2 is reduced to below the set value.
[0062] At present, the control range of carbon monoxide gas concentration in the dry quenching circulating gas is 1% to 6%, and the range of carbon monoxide gas concentration in the discharged gas is also 1% to 6%. In some embodiments, the dry quenching system of the present disclosure can limit the set value to 1%, and can reduce the carbon monoxide gas concentration in the circulating gas to below 1%, which has outstanding effects compared with the current dry quenching technology.
[0063] The present application also discloses a dry coke quenching control method, which uses the above-mentioned dry coke quenching system. After the dry coke quenching system is in operation, the carbon monoxide gas concentration in the airway 2 is obtained through the gas composition detection component 4. When the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection component 4 is greater than the set value, the air introduction device 3 enters an operating state, and introduces air into the preset section 221 through the air introduction port 31111; when the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection component 4 decreases to below the set value, the air introduction device is reduced to reduce the amount of air introduced per unit time, and air is continuously introduced into the preset section 221 of the high-temperature heat exchanger 22 to maintain the carbon monoxide gas concentration in the airway 2 less than the set value. Alternatively, when the carbon monoxide gas concentration in the airway 2 is much less than the set value, the air introduction device 3 is stopped from operating, and the introduction of air into the preset section 221 of the high-temperature heat exchanger 22 is stopped. For example, when the set value is 1%, when the carbon monoxide gas concentration in the air duct 2 is as low as 0.3%, the air introduction device 3 can be stopped until the carbon monoxide gas concentration in the air duct 2 rises to 0.8%, and then the air introduction device 3 is operated again and the air volume introduced per unit time by the air introduction device 3 is maintained at a low level.
[0064] In some embodiments, after the air introduction device 3 enters the operating state, when the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection element 4 continues to decrease and is greater than the set value, the air introduction device 3 is adjusted down to reduce the amount of air introduced per unit time.
[0065] In some embodiments, after the air introduction device 3 enters the operating state, when the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection device 4 is close to the set value, specifically within the range of 1 times to 1.05 times the set value, the opening of the air introduction device 3 is kept unchanged to keep the amount of air introduced per unit time stable.
[0066] In some embodiments, the set value is 1%. When the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 is greater than the set value of 1%, the air introduction device 3 enters the operating state and introduces air into the preset section 221 through the air introduction port 31111; after the air introduction device 3 enters the operating state, when the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 continues to decrease and is greater than 1.05 times the set value, the air introduction device 3 is appropriately reduced to reduce the amount of air introduced per unit time, until the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 is within the range of 1 to 1.05 times the set value, the opening of the air introduction device 3 is kept unchanged to keep the amount of air introduced per unit time stable; when the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 decreases to below the set value of 1%, the air introduction device 3 is reduced to reduce the amount of air introduced per unit time, or even the air introduction device 3 is stopped.
[0067] The present application also discloses a dry coke quenching control method, which uses the above-mentioned dry coke quenching system. When the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection component 4 is greater than the set value, the air introduction device 3 enters the operating state, and introduces air into the preset section 221 through the air introduction port 31111; when the air driving mechanism 34 of the air introduction device 3 enters the maximum air supply state but the carbon monoxide gas concentration in the airway 2 still cannot be reduced to below the set value, the main regulating valve 36 is closed, the second regulating valve 39 is opened, the blower 37 is started, and a sufficient amount of air is blown into the preset section 221 of the high-temperature heat exchanger 22 through the air introduction port 31111 until the carbon monoxide gas concentration in the airway 2 detected by the gas composition detection component 4 is reduced to below the set value, and then the blower 37 is closed.
[0068] In some embodiments, the set value is 1%. When the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 is greater than 1%, the air introduction device 3 enters the operating state and introduces air into the preset section 221 through the air introduction port 31111; when the air driving mechanism 34 of the air introduction device 3 enters the maximum air supply state but the carbon monoxide gas concentration in the airway 2 still cannot be reduced to below 1%, the main regulating valve 36 is closed, the second regulating valve 39 is opened, the blower 37 is started, and a sufficient amount of air is blown into the preset section 221 of the high-temperature heat exchanger 22 through the air introduction port 31111 until the carbon monoxide gas concentration in the airway 2 detected by the gas component detection element 4 is reduced to below 1%, and then the blower 37 is closed, the second regulating valve 39 is closed, the main regulating valve 36 is opened, and the air driving mechanism 34 introduces air.
[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
[0070] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A coke dry quenching system, comprising: The dry quenching coke oven is provided with a gas inlet and a gas outlet; An air passage for circulating gas for CDQ, with two ends respectively connected to the gas inlet and the gas outlet, a high-temperature heat exchanger, a low-temperature heat exchanger and a circulating fan are installed in the air passage along the circulating direction of the circulating gas, a gas passage in the high-temperature heat exchanger for circulating gas for CDQ is provided with a preset section, and the temperature of the circulating gas when flowing through the preset section is 600°C to 800°C; The air introduction device is provided with at least one air introduction port connected to the preset section, and the air introduction device is used to introduce air into the preset section through the air introduction port when the dry coke quenching system is running.
2. The dry coke quenching system according to claim 1, characterized in that: The air introduction device comprises: At least two air introduction pipes are installed in the high-temperature heat exchanger, and the at least two air introduction pipes are arranged in front and behind according to the flow direction of the gas path for the circulation of the dry quenching circulating gas in the high-temperature heat exchanger, and the air introduction pipes are provided with gas ports, and the gas ports are connected to the gas path for the circulation of the dry quenching circulating gas in the high-temperature heat exchanger; At least two first regulating valves, each of the air inlet pipes is equipped with at least one of the first regulating valves; at least two temperature measuring components, at least one of which is installed on each air inlet pipe, and the temperature measuring component is used to detect the temperature of the CDQ circulating gas at a position directly opposite to the gas port when the CDQ system is running, so as to determine the gas port belonging to the air inlet; The air driving mechanism is connected to at least two of the air introduction pipes and is used to introduce air into the air path for the circulation of the dry quenching circulating gas in the high-temperature heat exchanger through the air port belonging to the air introduction port when the dry quenching system is in operation.
3. The dry coke quenching system according to claim 2, characterized in that: The air introduction device comprises: A main pipe, one end of which is connected to at least two of the air introduction pipes, and the other end of which is connected to the air driving mechanism; A main regulating valve installed in the main pipe; a blower, opposite to the air drive mechanism; A branch pipe, one end of which is connected to the blower, and the other end of which is connected to the main pipe and connected between the air introduction pipe and the main regulating valve; The second regulating valve is installed in the branch pipe.
4. The dry coke quenching system according to claim 2, characterized in that: The air introduction pipe comprises: An annular pipe portion is provided with a plurality of gas ports, the plurality of gas ports are sequentially spaced along the annular shape of the annular pipe portion, and a distribution surface of the annular pipe portion is a cross section of a gas path for the circulation of the dry coke quenching circulating gas in the high-temperature heat exchanger that intersects with a flow direction; A main pipe part has one end communicated with the annular pipe part and the other end connected with the air driving mechanism, and at least one of the first regulating valves is installed in the main pipe part.
5. The dry coke quenching system according to any one of claims 1 to 4, characterized in that: The preset section defines that the temperature of the CDQ circulating gas entering the preset section when the CDQ system is in operation is within a range of 650° C. to 700° C.
6. The dry coke quenching system according to any one of claims 1 to 4, characterized in that: The dry coke quenching system comprises: A gas component detection component is installed in the gas passage and is located after the high-temperature heat exchanger along the flow direction of the circulating gas, and is used to detect the carbon monoxide gas concentration in the gas passage.
7. The dry coke quenching system according to claim 6, characterized in that: The dry coke quenching system comprises: A controller is signal-connected to the gas composition detection element and control-connected to the air introduction device, and is used to control the operation of the air introduction device to introduce air into the preset section through the air introduction port when the carbon monoxide gas concentration in the airway detected by the gas composition detection element is above a set value. The set value includes but is not limited to 1%.
8. The dry coke quenching system according to any one of claims 1 to 4, characterized in that: The air duct is also equipped with a first dust collector and a second dust collector. The first dust collector, the high-temperature heat exchanger, the second dust collector, the circulating fan and the low-temperature heat exchanger are arranged in sequence along the air flow direction of the air duct.
9. A coke dry quenching control method, characterized in that: A dry coke quenching system according to any one of claims 1 to 8, wherein the dry coke quenching system comprises a gas composition detection component, the gas composition detection component is installed in the gas passage and is located after the high-temperature heat exchanger along the gas flow direction of the gas passage, and the gas composition detection component is used to detect the carbon monoxide gas concentration in the gas passage; The dry coke quenching control method comprises: Acquiring the carbon monoxide gas concentration in the airway detected by the gas component detection element; When the carbon monoxide gas concentration in the airway detected by the gas component detection element is greater than a set value, the air introduction device enters an operating state to introduce air into the preset section through the air introduction port; When the carbon monoxide gas concentration in the airway detected by the gas component detector drops below the set value, the air introduction device is reduced to reduce the amount of air introduced per unit time or the air introduction device is stopped.
10. The dry coke quenching control method according to claim 9, characterized in that: include: After the air introduction device enters the operating state, when the carbon monoxide gas concentration in the airway detected by the gas component detection component continues to decrease and is greater than the set value, the air introduction device is adjusted down to reduce the amount of air introduced per unit time.