Low-nitrogen-emission coking method, device and system for heat recovery coke oven and electronic equipment

Abstract

The embodiment of the invention provides a low-nitrogen-emission coking method, device and system for a heat recovery coke oven and electronic equipment. The method comprises the following steps: calculating components and volume of raw gas generated by coking coal coking based on as-fired coal parameter guidance of the coking coal; the coking heat consumption demand of the coking coal in the carbonization chamber is calculated based on as-fired coal parameters of the coking coal, the coal charging quality of the carbonization chamber and the coking time of the coking coal, and the first volume required by combustion of the raw gas is calculated at least in combination with the coking heat consumption demand and the components of the raw gas; and distributing the combustion-supporting gas to the combustion chamber to combust the raw gas according to the combustion-supporting gas distribution flow Q, and coking the coking coal in the carbonization chamber, Q = the second volume of the combustion-supporting gas consumed for completely combusting the first volume of the raw gas / the coking time. The distribution flow Q of the combustion-supporting gas is matched with the components of the raw gas generated by coking coal, so that the combustion of the raw gas is more stable and balanced, and the generation amount of nitrogen oxides in the flue gas is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coking, and particularly to a method, device, system and electronic device for low-nitrogen emission coking in a heat recovery coke oven. Background Art

[0002] During the coking process of a heat recovery coke oven, the heat source is the heat released by the complete combustion of the raw gas generated during the coking of coking coal. The physical properties of the coal charged into the oven (coking coal) have a significant impact on the generation amount and composition of the raw gas.

[0003] The instability of the generation amount and the imbalance of the composition of the raw gas are likely to cause incomplete combustion or over-combustion in a local area, which in turn leads to a local high-temperature phenomenon and an increase in the generation amount of NOx. The waste gas discharged from the heat recovery coke oven must meet the low-nitrogen emission standard. At present, the vast majority of heat recovery coke ovens adopt the means of denitrification outside the furnace before emission. This solution has high investment and operation costs and is prone to generate solid waste that is difficult to handle. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a method, device, system and electronic device for low-nitrogen emission coking in a heat recovery coke oven, so as to reduce the generation amount of nitrogen oxides in the flue gas and reduce the operation cost of flue gas denitrification. The specific technical solutions are as follows:

[0005] The first aspect embodiment of the present application proposes a method for low-nitrogen emission coking in a heat recovery coke oven, including:

[0006] Calculating the components and volume of the raw gas generated by coking the coking coal based on the parameters of the coal charged into the oven, and the parameters of the coal charged into the oven include moisture, volatile matter and ash content;

[0007] Calculating the heat consumption demand for coking the coking coal in the carbonization chamber based on the parameters of the coal charged into the oven, the charging quality of the carbonization chamber and the coking time of the coking coal. At least combining the heat consumption demand and the components of the raw gas to calculate the first volume of the raw gas required for combustion. Through the combustion-supporting gas channel, the combustion-supporting gas is distributed to the combustion chamber to burn the raw gas according to the combustion-supporting gas distribution flow rate Q to coke the coking coal in the carbonization chamber, where Q = the second volume of the combustion-supporting gas consumed by completely burning the first volume of the raw gas / the coking time.

[0008] In some embodiments, it further includes: real-time monitoring of the flue gas temperature at the bottom of the combustion chamber;

[0009] When the flue gas temperature exceeds the first threshold, the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to reduce the combustion-supporting gas distribution flow rate Q;

[0010] When the flue gas temperature is less than the first threshold, by adjusting the opening degree of the combustion air damper on the inlet side of the combustion air channel, the distribution flow rate Q of the combustion-supporting gas is increased.

[0011] In some embodiments, a plurality of branch outlets are provided on the outlet side of the combustion air channel, and the plurality of branch outlets are respectively led into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber;

[0012] The top space temperature of the carbonization chamber is monitored in real time;

[0013] When the top space temperature exceeds the second threshold, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and only the opening degree of the top branch outlet is adjusted to reduce the air supply flow rate of the top branch outlet;

[0014] When the top space temperature is less than the second threshold, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and only the opening degree of the top branch outlet is adjusted to increase the air supply flow rate of the top branch outlet.

[0015] In some embodiments, it further includes:

[0016] The real-time concentration of nitrogen oxides at the reference oxygen content in the discharged flue gas is monitored in real time;

[0017] When the real-time concentration exceeds the set concentration, by adjusting the opening degree of the combustion air damper on the inlet side of the combustion air channel, the distribution flow rate Q of the combustion-supporting gas is reduced.

[0018] In some embodiments, when the real-time concentration exceeds the set concentration and the opening degree of the combustion air damper has reached the minimum value, the denitration unit is started, and according to the difference between the real-time concentration and the set concentration, the dosage of the denitration reagent of the denitration unit is proportioned to treat the flue gas.

[0019] In some embodiments, the coking time includes a first time period and a second time period, the first time period is close to the starting time of the coking time, and the second time period is close to the ending time of the coking time;

[0020] The distribution of the combustion-supporting gas to the combustion chamber according to the distribution flow rate Q of the combustion-supporting gas to burn the raw gas includes:

[0021] In the first time period, the combustion-supporting gas is distributed to the combustion chamber according to the distribution flow rate Q of the combustion-supporting gas to burn the raw gas;

[0022] In the second time period, the distribution flow rate Q of the combustion-supporting gas is reduced.

[0023] In the second aspect of the embodiments of the present application, a coking device for low-nitrogen emission of a heat recovery coke oven is proposed, including:

[0024] The raw gas calculation unit is used to calculate the components and volume of the raw gas generated by coking the coking coal based on the parameters of the coking coal charged into the furnace, and the parameters of the coking coal charged into the furnace include moisture, volatile matter and ash content;

[0025] The combustion control preset unit is used to calculate the heat consumption requirement for coking the coking coal based on the parameters of the coking coal charged into the furnace and the coking time of the coking coal, and at least combine the heat consumption requirement for coking and the components of the raw gas to calculate the first volume of the raw gas that needs to be burned. Through the combustion-supporting gas channel, the combustion-supporting gas is distributed to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the raw gas, and coking of the coking coal in the carbonization chamber is carried out, where Q = the second volume of the combustion-supporting gas consumed by completely burning the first volume of the raw gas / the coking time.

[0026] In some embodiments, it further includes:

[0027] The combustion degree adjustment unit is used to monitor the flue gas temperature at the bottom of the combustion chamber in real time;

[0028] When the flue gas temperature exceeds the first threshold, the opening of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to reduce the combustion-supporting gas distribution flow rate Q;

[0029] When the flue gas temperature is less than the first threshold, the opening of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to increase the combustion-supporting gas distribution flow rate Q.

[0030] In some embodiments, a plurality of branch outlets are provided on the outlet side of the combustion-supporting gas channel, and the plurality of branch outlets respectively lead into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber;

[0031] The combustion-supporting gas distribution adjustment unit is used to monitor the top space temperature of the carbonization chamber in real time;

[0032] When the top space temperature exceeds the second threshold, the combustion-supporting gas distribution flow rate Q remains unchanged, and only the opening of the top branch outlet is adjusted to reduce the gas supply flow rate of the top branch outlet;

[0033] When the top space temperature is less than the second threshold, the combustion-supporting gas distribution flow rate Q remains unchanged, and only the opening of the top branch outlet is adjusted to increase the gas supply flow rate of the top branch outlet.

[0034] In some embodiments, it further includes:

[0035] The nitrogen oxide monitoring unit is used to monitor the real-time concentration of nitrogen oxides under the reference oxygen content in the flue gas discharged in real time;

[0036] When the real-time concentration exceeds the set concentration, by adjusting the opening degree of the combustion air damper on the inlet side of the combustion-supporting gas channel, the distribution flow rate Q of the combustion-supporting gas is reduced.

[0037] In some embodiments, it further includes:

[0038] A denitration startup unit, configured to start the denitration unit when the real-time concentration exceeds the set concentration and the opening degree of the combustion air damper has reached the minimum value, and proportion the dosage of the denitration reagent of the denitration unit according to the difference between the real-time concentration and the set concentration, and treat the flue gas.

[0039] In some embodiments, the coking time includes a first time period and a second time period. The first time period is close to the start time of the coking time, and the second time period is close to the end time of the coking time;

[0040] The combustion control preset unit is specifically configured to, in the first time period, distribute the combustion-supporting gas to the combustion chamber to burn the raw coal gas according to the distribution flow rate Q of the combustion-supporting gas, and in the second time period, reduce the distribution flow rate Q of the combustion-supporting gas.

[0041] An embodiment of the third aspect of the present application provides a coke oven system, including a coke oven and the above-mentioned heat recovery coke oven low-nitrogen emission coking device.

[0042] An embodiment of the fourth aspect of the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus;

[0043] The memory is used to store a computer program;

[0044] When the processor is used to execute the program stored in the memory, it implements the above-mentioned heat recovery coke oven low-nitrogen emission coking method.

[0045] Beneficial effects of the embodiments of the present invention:

[0046] A coking method, device, system and electronic device for low nitrogen emission in a heat recovery coke oven provided by an embodiment of the present invention. The coking method for low nitrogen emission in a heat recovery coke oven includes: guiding the calculation of the composition and volume of the crude gas generated by coking the coking coal based on the parameters of the coal charged into the oven, where the parameters of the coal charged into the oven include moisture, volatile matter and ash; guiding the calculation of the heat consumption demand for coking the coking coal in the carbonization chamber based on the parameters of the coal charged into the oven, the charging quality of the carbonization chamber and the coking time of the coking coal. At least combining the heat consumption demand for coking and the composition of the crude gas to guide the calculation of the first volume of the combustion-supporting gas required for burning the crude gas. Through the combustion-supporting gas channel, the combustion-supporting gas is distributed to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the crude gas, and coking is carried out on the coking coal in the carbonization chamber, where Q = the second volume of the combustion-supporting gas consumed for completely burning the first volume of the crude gas / the coking time. In the embodiment of the present invention, the combustion-supporting gas distribution flow rate Q matches the composition of the crude gas generated by the coking coal. The combustion-supporting gas is distributed to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the crude gas, and coking is carried out on the coking coal in the carbonization chamber, which can make the combustion of the crude gas more stable and balanced, so as to reduce the generation amount of nitrogen oxides in the flue gas.

[0047] Of course, it is not necessary for any product or method implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other embodiments based on these drawings.

[0049] Figure 1 It is a schematic flow chart of a coking method for low nitrogen emission in a heat recovery coke oven provided by an embodiment of the present application;

[0050] Figure 2 It is a schematic flow chart of a specific coking method for low nitrogen emission in a heat recovery coke oven provided by an embodiment of the present application;

[0051] Figure 3 It is a schematic structural diagram of a coking device for low nitrogen emission in a heat recovery coke oven provided by an embodiment of the present application;

[0052] Figure 4 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of the present invention.

[0054] In a heat recovery coke oven during the coking process, the raw gas generated by the coking coal during coking burns in the combustion chamber to provide heat for the carbonization chamber. The coking coal is carbonized in the carbonization chamber of the coke oven under air isolation. The two sides of the carbonization chamber have high-temperature combustion chambers. From the sides close to the carbonization chamber to the center of the carbonization chamber, it successively experiences drying and dehydration, softening, plastic state, semi-coke solidification, condensation, and forms coke layer by layer. However, in the initial stage of coking, the coking coal is mostly water, in the middle stage, it is mostly tar, crude benzene, and coke oven gas, and in the later stage, it is mostly hydrogen. By the end of coking, the amount of raw gas generated decreases to very little. In addition, the composition and density of the raw gas also change greatly. From the initial stage to the end stage of coking, the hydrogen content in the raw gas will increase sharply, resulting in unstable generation and unbalanced composition of the raw gas generated by the coking coal during coking. It is difficult to control the stable and balanced combustion of the raw gas by using conventional combustion methods, which easily causes local high-temperature phenomena, resulting in a high generation amount of NOx in the flue gas and increasing the denitrification cost of the flue gas.

[0055] Figure 1 For the process flow diagram of a low-nitrogen emission coking method for a heat recovery coke oven provided by an embodiment of this application, please refer to Figure 1 In the first aspect of the embodiments of this application, a low-nitrogen emission coking method for a heat recovery coke oven is proposed, including:

[0056] S10. Based on the parameters of the coal charged into the oven, calculate the components and volume of the raw gas generated by the coking of the coking coal. The parameters of the coal charged into the oven include moisture, volatile matter, and ash content;

[0057] Among them, the coking coal is used to coke in the carbonization chamber to form coke. In this article, the coking coal is also called the coal charged into the oven.

[0058] Before the coking coal is sent into the carbonization chamber for coking, physical property tests are performed on the coking coal. For example, the physical properties include, but are not limited to, the elemental analysis and industrial analysis of the coking coal, so as to obtain the moisture, volatile matter, and ash content of the coking coal.

[0059] The components of the raw gas are the percentage contents of different components in the group gas, such as the percentage contents of tar, crude benzene, coke oven gas, and hydrogen.

[0060] S11. Calculate the heat consumption demand for coking of the coking coal in the carbonization chamber based on the parameters of the coal charged into the furnace, the charging quality of the carbonization chamber, and the coking time of the coking coal. At least combine the heat consumption demand for coking and the components of the crude gas to calculate the first volume of the crude gas that needs to be burned. Through the combustion-supporting gas channel, distribute the combustion-supporting gas to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the crude gas, and cokethe coking coal in the carbonization chamber. Q = the second volume of the combustion-supporting gas consumed for completely burning the first volume of the crude gas / the coking time.

[0061] Before the coking coal is sent into the carbonization chamber for coking, the physical properties of the coking coal can be detected to obtain the bulk density and the volume of the coal cake of the coking coal to be sent into the carbonization chamber. According to the product of the bulk density and the volume of the coal cake, the charging quality of the carbonization chamber can be obtained.

[0062] The coking time is the time for the high-temperature carbonization of the coking coal in the carbonization chamber, which is defined as the time interval from when the flat coal ram enters the carbonization chamber to when the pusher ram starts to push the coke. Generally, the shorter the coking time, the greater the heat consumption demand for coking, and the longer the coking time, the smaller the heat consumption demand for coking.

[0063] In the step of calculating the first volume of the crude gas that needs to be burned, it can be calculated and obtained by referring to the relevant specifications in the art in combination with the heat consumption demand for coking and the components of the crude gas according to the principles of material and heat conservation. For example, the heat consumption demand for coking can be calculated by combining the sensible heat brought in by the coal charged into the furnace, the sensible heat brought in by the combustion-supporting gas, the heat carried out by the coke and the flue gas, the heat recovered by the heat recovery coke oven, and the heat loss of the heat recovery coke oven. In the step of calculating the first volume of the crude gas that needs to be burned, the calorific value of the crude gas can be calculated according to the components of the crude gas, and then according to the calorific value of the crude gas, it can be calculated how much volume of the crude gas needs to be burned, and thus the first volume of the crude gas that needs to be burned can be obtained. Through the combustion-supporting gas channel, distribute the combustion-supporting gas to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the crude gas. Q = the second volume of the combustion-supporting gas consumed for completely burning the first volume of the crude gas / the coking time, which can make the combustion-supporting gas distribution flow rate Q match the components of the crude gas generated by the coking coal. Distributing the combustion-supporting gas to the combustion chamber at the combustion-supporting gas distribution flow rate Q to burn the crude gas and cokethe coking coal in the carbonization chamber can make the combustion of the crude gas more stable and balanced, so as to reduce the generation amount of nitrogen oxides in the flue gas.

[0064] Figure 2 For the flow schematic diagram of a specific coking method with low nitrogen emissions in a heat recovery coke oven provided by an embodiment of the present application, please refer to Figure 2 As shown, based on the above-mentioned embodiment of the coking method with low nitrogen emissions in a heat recovery coke oven, in order to further reduce the generation amount of nitrogen oxides in the flue gas, an embodiment of the present application proposes a coking method with low nitrogen emissions in a heat recovery coke oven, including:

[0065] S21. Obtain the parameters of the coal charged into the coke oven, where the parameters of the coal charged into the oven include the bulk density, the volume of the coal cake charged into a single hole of the carbonization chamber, moisture, volatile matter, and ash content. Calculate the mass of the coal charged into a single hole of the carbonization chamber according to the product of the bulk density and the volume of the coal cake charged into a single hole of the carbonization chamber.

[0066] S22. Based on the moisture, volatile matter, and ash content of the coking coal, guide the calculation of the components and volume of the raw gas generated by coking the coking coal.

[0067] S23. Obtain the coke pushing sequence of each carbonization chamber of the heat recovery coke oven.

[0068] A heat recovery coke oven is usually provided with multiple carbonization chambers and multiple combustion chambers, which are arranged alternately. Each carbonization chamber, that is, each individual carbonization chamber, can be referred to as each furnace hole.

[0069] The coke pushing sequence is the number of holes of each carbonization chamber and a working schedule corresponding to each carbonization chamber arranged according to the turnover time every day, including the coke pushing and coal charging time points of each carbonization chamber, so as to guide the operation of completing the coke pushing and coal charging time points of each carbonization chamber.

[0070] The turnover time is the time interval between two coke pushings of a carbonization chamber, including the coking time of the coking coal and the operation times such as coke pushing and coal charging. It is determined according to factors such as the brick material of the heat recovery coke oven, the width of the carbonization chamber, the furnace body and equipment conditions, the operation level, and the coke quality.

[0071] S24. Based on the moisture, volatile matter, ash content, the coal charging mass of a single hole of the carbonization chamber of the coking coal and the coking time of the coking coal, guide the calculation of the heat consumption demand for coking the coking coal in a single hole of the carbonization chamber. At least in combination with the heat consumption demand and the components of the raw gas, guide the calculation of the first volume of the combustion-supporting gas required for burning the raw gas. According to the coke pushing sequence, through the combustion-supporting gas channel, distribute the combustion-supporting gas to the corresponding combustion chamber of each carbonization chamber according to the combustion-supporting gas distribution flow rate Q to burn the raw gas, and carry out coking on the coking coal in each carbonization chamber, where Q = the second volume of the combustion-supporting gas consumed by completely burning the first volume of the raw gas / the coking time.

[0072] Generally, in the coke pushing sequence, the coke pushing and coal charging time points of each carbonization chamber may be different. Correspondingly, for the carbonization chambers with different coke pushing and coal charging time points, the combustion-supporting gas can be distributed to the corresponding combustion chamber of the carbonization chamber according to the coke pushing and coal charging time points corresponding to the carbonization chamber according to the combustion-supporting gas distribution flow rate Q to burn the raw gas, and the coking of the coking coal in each carbonization chamber can be completed respectively.

[0073] In this embodiment, the order of steps S21 and S23 is not limited. Additionally, the two can also be carried out simultaneously.

[0074] In some embodiments, the coking time includes a first time period and a second time period. The first time period is close to the start time of the coking time and can be the early stage of the coking time. The second time period is close to the end time of the coking time and can be the middle and late stages of the coking time.

[0075] Distributing the combustion-supporting gas to the combustion chamber to burn the raw coal gas according to the combustion-supporting gas distribution flow rate Q includes:

[0076] In the first time period, distributing the combustion-supporting gas to the combustion chamber to burn the raw coal gas according to the combustion-supporting gas distribution flow rate Q;

[0077] In the second time period, reducing the combustion-supporting gas distribution flow rate Q.

[0078] In this embodiment, in the early stage of the coking time, there is usually less combustible gas in the raw coal gas, while in the middle and late stages of the coking time, there is usually more combustible gas in the raw coal gas. In the middle and late stages of the coking time, reducing the combustion-supporting gas distribution flow rate Q is beneficial to maintaining the constant temperature in the combustion chamber and reducing the probability of excessive combustion temperature, thereby being beneficial to reducing the generation of nitrogen oxides in the flue gas.

[0079] S25. Real-time monitor the flue gas temperature at the bottom of the combustion chamber; when the flue gas temperature exceeds the first threshold, reduce the combustion-supporting gas distribution flow rate Q by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel; when the flue gas temperature is less than the first threshold, increase the combustion-supporting gas distribution flow rate Q by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel.

[0080] Taking the first threshold as 1300°C to 1400°C as an example, if the flue gas temperature at the bottom of the combustion chamber is relatively high, higher than 1400°C, adjust the opening degree of the combustion-supporting air damper to be smaller to reduce the combustion-supporting gas distribution flow rate Q. If the flue gas temperature at the bottom of the combustion chamber is relatively low, lower than 1300°C, adjust the opening degree of the combustion-supporting air damper to be larger to increase the combustion-supporting gas distribution flow rate Q.

[0081] The opening degree of the combustion-supporting air damper can be controlled by the control system to instruct the actuator to act, or the recommended opening degree can be given by a preset unit for manual operation and adjustment. The structural form of the combustion-supporting air damper is not limited and can be in the form of a valve, a sluice plate, a brick body, etc.

[0082] S26. Multiple branch outlets are provided on the outlet side of the combustion-supporting gas channel. The multiple branch outlets respectively lead into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber. The temperature of the top space of the carbonization chamber is monitored in real time. When the temperature of the top space exceeds the second threshold, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and only the opening degree of the top branch outlet is adjusted to reduce the gas supply flow rate of the top branch outlet. When the temperature of the top space is less than the second threshold, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and only the opening degree of the top branch outlet is adjusted to increase the gas supply flow rate of the top branch outlet.

[0083] After the combustion-supporting gas enters the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel, it is blown out from the multiple branch outlets on the outlet side of the combustion-supporting gas channel. The air blowing volume of each branch outlet depends on the preset opening size configured for each branch outlet to uniformly provide heat to different height positions of the carbonization chamber.

[0084] Specifically, combustion chambers are provided on both sides of each carbonization chamber to provide the heat required for coking in the carbonization chamber. The combustion chamber is composed of multiple vertical flues. After air enters the combustion-supporting gas channel, it is distributed to each vertical flue by the combustion-supporting gas channel. Among them, multiple branch outlets are provided in the height direction of each vertical flue. The multiple branch outlets respectively lead into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber, so as to uniformly provide heat to different height positions of the carbonization chamber.

[0085] Specifically, the opening degree of the top branch outlet is adjustable. By adjusting the opening degree of the top branch outlet, the distribution ratio of the combustion-supporting gas at the top branch outlet is adjusted. Taking the second threshold being 600°C to 800°C as an example, if the temperature of the top space of the carbonization chamber is relatively high, higher than 800°C, the opening degree of the combustion-supporting air damper is not adjusted, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and the opening degree of the top branch outlet is reduced to reduce the distribution ratio of the combustion-supporting gas at the top branch outlet, thereby reducing the probability that the temperature of the top space of the carbonization chamber is too high and causing the nitrogen oxides in the flue gas to exceed the standard.

[0086] If the temperature of the top space of the carbonization chamber is relatively low, lower than 600°C, the opening degree of the combustion-supporting air damper is not adjusted, the distribution flow rate Q of the combustion-supporting gas is kept unchanged, and the opening degree of the top branch outlet is increased to increase the distribution ratio of the combustion-supporting gas at the top branch outlet, which is beneficial to completing the coking of the coking coal according to the predetermined time.

[0087] The adjustment of the opening degree of the top branch outlet varies according to the structure of the branch outlet. If an actuator and a valve are provided at the top branch outlet, the valve opening degree can be controlled by the central control to control the actuator. If a brick structure is provided at the top branch outlet, the outlet size can be adjusted by adjusting the number, thickness, etc. of the adjusting bricks.

[0088] S27. Monitor the real-time concentration of nitrogen oxides at the reference oxygen content in the flue gas being discharged in real time; when the real-time concentration exceeds the set concentration, reduce the combustion-supporting gas distribution flow rate Q by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas passage.

[0089] In practice, a nitrogen oxide concentration measuring instrument and an oxygen concentration measuring instrument are respectively installed at the low-temperature flue gas. The nitrogen oxide concentration measuring instrument measures the concentration of nitrogen oxides in the flue gas in real time, and the oxygen concentration measuring instrument measures the concentration of oxygen in the flue gas in real time. According to the national or local emission standard requirements and in combination with the measured oxygen concentration, the measured nitrogen oxide concentration can be calculated to the real-time concentration of nitrogen oxides at the reference oxygen content.

[0090] By reducing the combustion-supporting gas distribution flow rate Q, the combustion degree of the raw coal gas in the combustion chamber can be reduced, and the combustion temperature can be reduced, thereby reducing the generation amount of nitrogen oxides during the combustion process.

[0091] When the real-time concentration does not exceed the set concentration, the flue gas can be directly discharged.

[0092] S28. When the real-time concentration exceeds the set concentration and the opening degree of the combustion-supporting air damper has reached the minimum value, start the denitration unit, and according to the difference between the real-time concentration and the set concentration, proportion the amount of denitration reagent of the denitration unit to treat the flue gas.

[0093] The denitration unit calculates the required amount of denitration reagent based on the concentration difference between the monitored concentration of nitrogen oxides at the reference oxygen content in the flue gas and the required concentration of nitrogen oxides at the reference oxygen content to control the denitration flow rate. For example, the opening degree of the corresponding valve for adjusting the denitration flow rate can be adjusted to control the flow rate. The denitration method of the denitration unit is not limited to in-furnace denitration, in-boiler denitration, out-of-furnace denitration, etc.

[0094] Figure 3 The following is a schematic structural diagram of a low-nitrogen emission coking device for a heat recovery coke oven provided by an embodiment of the present application. Please refer to Figure 3 As shown, an embodiment of the second aspect of the present application proposes a low-nitrogen emission coking device for a heat recovery coke oven, including:

[0095] A raw coal gas calculation unit 10, configured to guide the calculation of the components and volume of the raw coal gas generated by coking the coking coal based on the parameters of the coking coal charged into the furnace, where the parameters of the coking coal charged into the furnace include moisture, volatile matter, and ash content;

[0096] A combustion control preset unit 20 is configured to calculate the coking heat consumption demand of the coking coal in the carbonization chamber based on the parameters of the coking coal charged into the furnace, the coal charging quality of the carbonization chamber, and the coking time of the coking coal, and calculate the first volume of the combustion-supporting gas required for the combustion of the raw gas by at least combining the coking heat consumption demand and the components of the raw gas. The combustion-supporting gas is distributed to the combustion chamber through the combustion-supporting gas channel according to the combustion-supporting gas distribution flow rate Q to burn the raw gas, and coking is performed on the coking coal in the carbonization chamber. Q = the second volume of the combustion-supporting gas consumed for completely burning the first volume of the raw gas / the coking time.

[0097] In some embodiments, it further includes: a combustion degree adjustment unit 30 for real-time monitoring of the flue gas temperature at the bottom of the combustion chamber;

[0098] When the flue gas temperature exceeds the first threshold, the combustion-supporting gas distribution flow rate Q is reduced by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel;

[0099] When the flue gas temperature is less than the first threshold, the combustion-supporting gas distribution flow rate Q is increased by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel.

[0100] In some embodiments, a plurality of branch outlets are provided on the outlet side of the combustion-supporting gas channel, and the plurality of branch outlets respectively communicate with different height positions of the carbonization chamber adjacent to the combustion chamber; it further includes:

[0101] A combustion-supporting gas distribution adjustment unit 40 for real-time monitoring of the top space temperature of the carbonization chamber;

[0102] When the top space temperature exceeds the second threshold, the combustion-supporting gas distribution flow rate Q is kept unchanged, and only the opening degree of the top branch outlet is adjusted to reduce the gas supply flow rate of the top branch outlet;

[0103] When the top space temperature is less than the second threshold, the combustion-supporting gas distribution flow rate Q is kept unchanged, and only the opening degree of the top branch outlet is adjusted to increase the gas supply flow rate of the top branch outlet.

[0104] In some embodiments, it further includes: a nitrogen oxide monitoring unit 50 for real-time monitoring of the real-time concentration of nitrogen oxides under the reference oxygen content in the discharged flue gas;

[0105] When the real-time concentration exceeds the set concentration, the combustion-supporting gas distribution flow rate Q is reduced by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel.

[0106] In some embodiments, it further includes: a denitration startup unit 60, configured to start the denitration unit when the real-time concentration exceeds the set concentration and the opening degree of the combustion air damper has reached the minimum value, and proportion the dosage of the denitration reagent of the denitration unit according to the difference between the real-time concentration and the set concentration, and treat the flue gas.

[0107] In some embodiments, it further includes: an in-furnace coal parameter unit 70, configured to obtain the physical properties of the coking coal, calculate the in-furnace coal parameters according to the physical properties, the physical properties include ultimate analysis, proximate analysis, bulk density and coal cake volume, and the in-furnace coal parameters include the single-hole coal charging amount, the in-furnace coal moisture content and the volatile matter parameter.

[0108] In some embodiments, it further includes: a production plan unit 80, configured to obtain the coke pushing time sequence of each coking chamber of the heat recovery coke oven;

[0109] The combustion control preset unit 20 is specifically configured to guide and calculate the coking heat demand of the coking coal in a single coking chamber based on the moisture content, volatile matter content, ash content of the coking coal, the coal charging mass of a single coking chamber, and the coking time of the coking coal, at least combine the coking heat demand and the components of the raw gas to guide and calculate the first volume of the raw gas required to be burned, and according to the coke pushing time sequence, through the combustion-supporting gas channel, distribute the combustion-supporting gas to the corresponding combustion chamber of each coking chamber according to the combustion-supporting gas distribution flow rate Q to burn the raw gas, and coke the coking coal in each coking chamber, Q = the second volume of the combustion-supporting gas consumed by completely burning the first volume of the raw gas / the coking time.

[0110] The third aspect embodiment of the present application proposes a coke oven system, including a coke oven and a low-nitrogen emission coking device for a heat recovery coke oven according to any one of the embodiments proposed in the third aspect.

[0111] Figure 4 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. The embodiment of the present invention also provides an electronic device, as Figure 4 shown, including a processor 101, a communication interface 102, a memory 103 and a communication bus 104, wherein the processor 101, the communication interface 102, and the memory 103 communicate with each other through the communication bus 104.

[0112] The memory 103 is used for storing a computer program;

[0113] When the processor 101 is configured to execute the program stored in the memory 103, the following steps are implemented:

[0114] Based on the in-furnace coal parameters of the coking coal, guide and calculate the flow rate and components of the raw gas generated by coking the coking coal, and the in-furnace coal parameters include the in-furnace coal moisture content and the volatile matter parameter;

[0115] According to the coking heat consumption demand determined by the coking coal production plan, the flow rate and components of the crude gas, calculate the required combustion flow rate of the crude gas, and distribute the combustion-supporting gas to the combustion chamber according to the combustion-supporting gas distribution flow rate Q, and carry out coking on the coking coal in the carbonization chamber, where Q = the amount of the first combustion-supporting gas for burning the required combustion flow rate of the crude gas / the amount of the second combustion-supporting gas for burning all the crude gas.

[0116] The communication bus mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only a thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0117] The communication interface is used for communication between the above electronic device and other devices.

[0118] The memory can include a Random Access Memory (RAM), and can also include a Non-Volatile Memory (NVM), such as at least one disk memory. Optionally, the memory can also be at least one storage device located far from the aforementioned processor.

[0119] The above-mentioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0120] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)).

[0121] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise", or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

[0122] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0123] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A low-nitrogen emission coking method for a heat recovery coke oven, characterized in that, Comprising: Based on the parameters of the coal charged into the coke oven for coking coal, guiding the calculation of the components and volume of the crude gas generated by coking the coking coal, where the parameters of the coal charged into the oven include moisture, volatile matter, and ash content; Based on the parameters of the coal charged into the coke oven for coking coal, the coal charging quality in the carbonization chamber, and the coking time of the coking coal, guiding the calculation of the heat consumption demand for coking the coking coal in the carbonization chamber. At least combining the heat consumption demand for coking and the components of the crude gas to guide the calculation of the first volume of the combustion-supporting gas required for burning the crude gas. Through the combustion-supporting gas channel, the combustion-supporting gas is distributed to the combustion chamber to burn the crude gas according to the combustion-supporting gas distribution flow rate Q for coking the coking coal in the carbonization chamber, where Q = the second volume of the combustion-supporting gas consumed for completely burning the first volume of the crude gas / the coking time.

2. The coking method for low nitrogen emission of a heat recovery coke oven according to claim 1, characterized in that, Further comprising: Real-time monitoring of the flue gas temperature at the bottom of the combustion chamber; When the flue gas temperature exceeds the first threshold, by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel, reducing the combustion-supporting gas distribution flow rate Q; When the flue gas temperature is less than the first threshold, by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel, increasing the combustion-supporting gas distribution flow rate Q.

3. The low-nitrogen emission coking method for a heat recovery coke oven according to claim 1, characterized in that Multiple branch outlets are provided on the outlet side of the combustion-supporting gas channel, and the multiple branch outlets respectively lead into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber; Real-time monitoring of the top space temperature of the carbonization chamber; When the top space temperature exceeds the second threshold, keeping the combustion-supporting gas distribution flow rate Q unchanged, only adjusting the opening degree of the top branch outlet to reduce the gas supply flow rate of the top branch outlet; When the top space temperature is less than the second threshold, keeping the combustion-supporting gas distribution flow rate Q unchanged, only adjusting the opening degree of the top branch outlet to increase the gas supply flow rate of the top branch outlet.

4. The coking method for low nitrogen emission of heat recovery coke oven according to claim 2, characterized in that, Further comprising: Real-time monitoring of the real-time concentration of nitrogen oxides under the reference oxygen content in the discharged flue gas; When the real-time concentration exceeds the set concentration, by adjusting the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel, reducing the combustion-supporting gas distribution flow rate Q.

5. The low-nitrogen emission coking method for a heat recovery coke oven according to claim 4, characterized in that When the real-time concentration exceeds the set concentration and the opening degree of the combustion-supporting air damper has reached the minimum value, starting the denitration unit and, according to the difference between the real-time concentration and the set concentration, proportioning the dosage of the denitration reagent of the denitration unit to treat the flue gas.

6. The low-nitrogen emission coking method for a heat recovery coke oven according to claim 1, characterized in that The coking time includes a first time period and a second time period. The first time period is close to the starting time of the coking time, and the second time period is close to the ending time of the coking time; The distribution of the combustion-supporting gas to the combustion chamber to burn the crude gas according to the combustion-supporting gas distribution flow rate Q includes: In the first time period, distributing the combustion-supporting gas to the combustion chamber to burn the crude gas according to the combustion-supporting gas distribution flow rate Q; In the second time period, reducing the combustion-supporting gas distribution flow rate Q.

7. A coking device for low-nitrogen emission with heat recovery coke oven, characterized in that, Comprising: A raw gas calculation unit for guiding the calculation of the components and volume of the raw gas produced by coking the coking coal based on the parameters of the coal charged into the furnace, where the parameters of the coal charged into the furnace include moisture, volatile matter, and ash content; A combustion control preset unit for guiding the calculation of the heat consumption requirement for coking the coking coal based on the parameters of the coal charged into the furnace and the coking time of the coking coal, and guiding the calculation of the first volume of the combustion-supporting gas required for burning the raw gas by at least combining the heat consumption requirement for coking and the components of the raw gas. The combustion-supporting gas is distributed to the combustion chamber through the combustion-supporting gas channel to burn the raw gas according to the flow rate Q of the combustion-supporting gas distribution, and coking is carried out on the coking coal in the carbonization chamber. Q = the second volume of the combustion-supporting gas consumed by completely burning the first volume of the raw gas / the coking time.

8. The coking device for low nitrogen emission of heat recovery coke oven according to claim 7, characterized in that, It further includes: A combustion degree adjustment unit for real-time monitoring of the flue gas temperature at the bottom of the combustion chamber; When the flue gas temperature exceeds the first threshold, the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to reduce the flow rate Q of the combustion-supporting gas distribution; When the flue gas temperature is less than the first threshold, the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to increase the flow rate Q of the combustion-supporting gas distribution.

9. The low-nitrogen emission coking device of a heat recovery coke oven according to claim 7, wherein Multiple branch outlets are provided on the outlet side of the combustion-supporting gas channel, and the multiple branch outlets are respectively led into the combustion chamber and correspond to different height positions of the carbonization chamber adjacent to the combustion chamber; A combustion-supporting gas distribution adjustment unit for real-time monitoring of the top space temperature of the carbonization chamber; When the top space temperature exceeds the second threshold, the flow rate Q of the combustion-supporting gas distribution remains unchanged, and only the opening degree of the top branch outlet is adjusted to reduce the gas supply flow rate of the top branch outlet; When the top space temperature is less than the second threshold, the flow rate Q of the combustion-supporting gas distribution remains unchanged, and only the opening degree of the top branch outlet is adjusted to increase the gas supply flow rate of the top branch outlet.

10. The coking device for low nitrogen emission with heat recovery coke oven according to claim 9, characterized in that, It further includes: A nitrogen oxide monitoring unit for real-time monitoring of the real-time concentration of nitrogen oxides under the reference oxygen content in the flue gas discharged; When the real-time concentration exceeds the set concentration, the opening degree of the combustion-supporting air damper on the inlet side of the combustion-supporting gas channel is adjusted to reduce the flow rate Q of the combustion-supporting gas distribution.

11. The coking device for low nitrogen emission with heat recovery coke oven according to claim 10, characterized in that, It further includes: A denitrification start unit for starting the denitrification unit when the real-time concentration exceeds the set concentration and the opening degree of the combustion-supporting air damper has reached the minimum value, and proportioning the dosage of the denitrification reagent of the denitrification unit according to the difference between the real-time concentration and the set concentration to treat the flue gas.

12. The low-nitrogen emission coking device of a heat recovery coke oven according to claim 7, wherein The coking time includes a first time period and a second time period. The first time period is close to the starting time of the coking time, and the second time period is close to the ending time of the coking time; The combustion control preset unit is specifically configured to distribute the combustion-supporting gas to the combustion chamber according to the flow rate Q of the combustion-supporting gas distribution to burn the raw gas in the first time period, and reduce the flow rate Q of the combustion-supporting gas distribution in the second time period.

13. A coke oven system, characterized in that, It includes a coke oven and a low-nitrogen emission coking device for a heat recovery coke oven according to any one of claims 7 to 12.

14. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus; The memory is used for storing computer programs; When the processor is used to execute the programs stored on the memory, it realizes the low-nitrogen emission coking method for a heat recovery coke oven according to any one of claims 1 to 6.

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