Raw gas cooling method and system

Abstract

The invention provides a raw gas cooling method and system, and relates to the technical field of coking gas blast cooling. And under the condition that a starting instruction of the coke oven carbonization chamber is received, the cooling liquid spraying module is controlled to spray cooling liquid into the gas conveying pipeline based on a first spraying rate, and the first spraying rate is lower than a preset standard spraying rate. Under the condition that the temperature of the raw gas reaches a preset first temperature and the temperature change amplitude of the raw gas within a previous first preset duration is smaller than a preset temperature amplitude, a cooling liquid spraying module is controlled to spray cooling liquid into the gas conveying pipeline based on a second spraying speed, the second spraying rate is higher than a preset standard spraying rate; and under the condition that the temperature of the raw gas reaches the preset peak temperature or continuously drops within the previous second preset duration, the cooling liquid spraying module is controlled to spray cooling liquid into the gas conveying pipeline on the basis of a third spraying rate, and the third spraying rate is lower than the first spraying rate.

Description

Technical Field

[0001] The present application relates to the technical field of coking gas blast cooling, and in particular to a raw gas cooling method and system. Background Art

[0002] After coal is dry-distilled in the coke oven's carbonization chamber, it produces coke and raw gas. The raw gas exiting the carbonization chamber has a temperature of 650°C to 700°C and contains various substances (such as tar, crude benzene, water vapor, and hydrogen sulfide). Due to the high temperature of the raw gas, it requires cooling with a coolant.

[0003] The current coolant spraying method involves continuous application at a fixed rate. However, after the incoming coal enters the high-temperature carbonization chamber, the raw gas production and temperature fluctuate over time. Consequently, when the raw gas production is low and the temperature is low, the coolant spraying rate is excessive, resulting in waste. When the raw gas production is high and the temperature is high, the coolant spraying rate is too low to reduce the raw gas to the appropriate temperature. Summary of the Invention

[0004] The present application provides a raw gas cooling method and system, which is used to solve the problem in the prior art that when the amount of raw gas produced is small and the temperature is low, the amount of coolant sprayed is too large, resulting in waste of coolant; when the amount of raw gas produced is large and the temperature is high, the amount of coolant sprayed is too small, and the raw gas cannot be reduced to a suitable temperature.

[0005] In a first aspect, the present application provides a method for cooling raw gas, which is applied to a raw gas cooling system. The raw gas cooling system includes a main controller, a gas transmission pipeline, a temperature sensor provided in the gas transmission pipeline, and a coolant spraying module. The method provided by the present application includes:

[0006] Upon receiving a start-up instruction from the coke oven carbonization chamber, the main controller controls the coolant spraying module to spray the coolant into the gas transmission pipeline at a first spraying rate, wherein the first spraying rate is lower than a preset standard spraying rate;

[0007] The temperature sensor collects the temperature of the raw gas overflowing from the coking chamber of the coke oven in the gas transmission pipeline;

[0008] When the temperature of the raw gas reaches a preset first temperature and the temperature variation of the raw gas within the first preset time period is less than a preset temperature amplitude, the main controller controls the coolant spraying module to spray coolant into the gas transmission pipeline at a second spraying rate, wherein the second spraying rate is higher than a preset standard spraying rate.

[0009] When the temperature of the raw coke oven gas reaches the preset peak temperature or continuously decreases within the previous second preset time period, the main controller controls the coolant spraying module to spray coolant into the gas transmission pipeline at a third spraying rate, where the third spraying rate is lower than the first spraying rate.

[0010] In some embodiments, the first spraying rate satisfies the formula L1 = k1L, where L1 is the first spraying rate, 50% < k1 < 90%, and L is the preset standard spraying rate.

[0011] In some embodiments, the second spraying rate satisfies the formula L2 = k2L, where L2 is the second spraying rate, 100% < k2 < 130%, and L is the preset standard spraying rate.

[0012] In some embodiments, the third spraying rate satisfies the formula L3 = k3L, where L3 is the third spraying rate, 30% < k3 ≤ 50%, and L is the preset standard spraying rate.

[0013] In some embodiments, after controlling the coolant spraying module to spray coolant into the gas transmission pipeline at the second spraying rate, the method provided in this application further includes:

[0014] When the temperature of the raw coke oven gas is lower than the preset second temperature, or the ratio of the current working duration of the coke oven carbonization chamber to the preset total working duration is greater than 80%, control the coolant spraying module to spray coolant into the gas transmission pipeline at the third spraying rate.

[0015] In some embodiments, the coolant is ammonia water, and the temperature sensor is arranged outside the gas transmission pipeline.

[0016] In some embodiments, in the flow direction of the raw coke oven gas, the temperature sensor is located before the coolant spraying module.

[0017] In some embodiments, the value range of the first temperature is 480°C - 600°C.

[0018] In some embodiments, the preset temperature amplitude range is 3°C - 15°C.

[0019] In a second aspect, this application also provides a raw coke oven gas cooling system, including a main controller, a gas transmission pipeline, a temperature sensor arranged on the gas transmission pipeline, and a coolant spraying module. The temperature sensor is used to collect the temperature of the raw coke oven gas overflowing from the coke oven carbonization chamber in the gas transmission pipeline; the main controller is used to execute the method executed by the main controller in the first aspect of this application.

[0020] The present application provides a raw gas cooling method and system. When the main controller receives the start-up instruction of the coke oven carbonization chamber, it indicates that the coal mine is in the initial carbonization (changed to "carbonization") stage, and controls the coolant spraying module to spray coolant into the gas transmission pipeline based on a first spraying rate, wherein the first spraying rate is lower than the preset standard spraying rate. In the initial carbonization stage, the temperature of the raw gas generated in the coke oven carbonization chamber is relatively low, and the volume of the raw gas generated is relatively small. Therefore, the coolant spraying module can spray at a rate lower than the preset standard spraying rate, which can save coolant, reduce costs, and reduce the raw gas to a suitable temperature. The temperature sensor collects the temperature of the raw gas overflowing from the coke oven carbonization chamber in the gas transmission pipeline;

[0021] When the temperature of the raw gas reaches a preset first temperature and the temperature change amplitude of the raw gas within the previous first preset time period is less than the preset temperature amplitude, the main controller indicates that the coal mine is in the mid-term carbonization stage. At this time, the temperature in the coke oven carbonization chamber is high and the amount of raw gas generated is high. The main controller controls the coolant spraying module to spray coolant into the gas transmission pipeline based on the second spraying rate, wherein the second spraying rate is higher than the preset standard spraying rate. The coolant spraying module can spray at a rate higher than the preset standard spraying rate, which can reduce the raw gas to a suitable temperature without causing waste of coolant.

[0022] When the temperature of the raw coal gas reaches the preset peak temperature or continues to decrease within the previous second preset time period, the main controller indicates that the coal mine is in the final carbonization stage, there are fewer coal mines that have not been carbonized, and less raw coal gas is produced. Therefore, the main controller can control the coolant spraying module to spray coolant into the gas transmission pipeline based on the third spraying rate, where the third spraying rate is lower than the first spraying rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 A structural block diagram of the raw gas cooling system provided in an embodiment of the present application;

[0025] Figure 2 This is a flow chart of the raw gas cooling method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0027] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments of the present disclosure. These figures are not drawn to scale, and for the purpose of clarity, certain details are exaggerated and certain details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, it can be directly on the other layer / element or an intervening layer / element may be present therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, it may be "below" the other layer / element when the orientation is reversed.

[0029] The following describes in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0030] The embodiment of the present application provides a method for cooling raw gas, which is applied to a raw gas cooling system. Figure 1 As shown, the raw gas cooling system includes a main controller 101, a gas delivery pipeline 102, a temperature sensor 103 provided on the gas delivery pipeline 102, and a coolant spraying module 104. Figure 2 As shown, the method provided in the embodiment of the present application includes:

[0031] S201: upon receiving a start-up instruction from the coke oven carbonization chamber 105, the main controller 101 controls the coolant spraying module 104 to spray coolant into the gas delivery pipeline 102 based on a first spraying rate, wherein the first spraying rate is lower than a preset standard spraying rate.

[0032] The coke oven carbonization chamber 105 primarily functions to dry distill coal, producing coke and raw gas. The chamber is a sealed space specifically designed to hold coal. Dry distillation occurs at high temperatures, isolated from air, decomposing the coal into coke and raw gas. The amount of raw gas produced varies at different stages.

[0033] In some embodiments, the first spraying rate satisfies the formula L1 = k1L, where L1 is the first spraying rate, 50% < k1 < 90%, and L is a preset standard spraying rate (such as 1587 m 3 / h). For example, k1 is, but not limited to, 60%, 70%, or 80%. The standard spraying rate is the theoretical coolant spraying rate calculated based on production parameters.

[0034] When the main controller 101 receives the start instruction of the coke oven carbonization chamber 105, it indicates that the coal mine is in the initial carbonization stage. The main controller 101 controls the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the first spraying rate, where the first spraying rate is lower than the preset standard spraying rate. In the initial carbonization stage, the temperature in the coke oven carbonization chamber 105 is relatively low, and the raw gas generated is less. Therefore, the coolant spraying module 104 can spray at a rate lower than the preset standard spraying rate, which can save coolant, reduce costs, and reduce the raw gas to an appropriate temperature.

[0035] S202: The temperature sensor 103 collects the temperature of the raw gas overflowing from the coke oven carbonization chamber 105 in the gas transmission pipeline 102.

[0036] It should be noted that when the coolant is ammonia water, the temperature sensor 103 is arranged outside the gas transmission pipeline 102 to avoid affecting the acquisition accuracy of the temperature sensor 103 by the ammonia water. The sampling frequency of the temperature sensor 103 can be, but not limited to, 2 min / time or 1 min / time.

[0037] S203: When the temperature of the raw gas reaches the preset first temperature and the temperature change range of the raw gas is less than the preset temperature range within the previous first preset duration, the main controller 101 controls the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the second spraying rate, where the second spraying rate is higher than the preset standard spraying rate.

[0038] Exemplarily, the second spraying rate satisfies the formula L2 = k2L, where L2 is the second spraying rate, 100% < k2 < 130%, and L is the preset standard spraying rate. For example, k2 can be, but not limited to, 120% and 125%, etc., and is not limited herein.

[0039] In some embodiments, the value range of the first temperature is 480°C - 600°C. For example, the first temperature can be 500°C, 560°C, or 600°C, etc., which is not limited herein. The first preset duration can be 5h, 7h, or 8h, etc., which is not limited herein. Among them, the preset temperature amplitude range is 3°C - 15°C. For example, the preset temperature amplitude can be 3°C, 9°C, or 15°C, etc., which is not limited herein.

[0040] When the temperature of the raw gas reaches the preset first temperature and the temperature change amplitude of the raw gas is less than the preset temperature amplitude within the previous first preset duration, it indicates that the coal mine is in the mid-term carbonization stage. At this time, the temperature in the coke oven carbonization chamber 105 is relatively high, and the amount of raw gas generated is also relatively high. Then, the main controller 101 controls the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the second spraying rate, where the second spraying rate is higher than the preset standard spraying rate. The coolant spraying module 104 can spray at a rate higher than the preset standard spraying rate, which can reduce the raw gas to a suitable temperature without causing waste of coolant.

[0041] S204: When the temperature of the raw gas reaches the preset peak temperature or continuously drops within the previous second preset duration, the main controller 101 controls the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the third spraying rate, where the third spraying rate is lower than the first spraying rate.

[0042] In some embodiments, the third spraying rate satisfies the formula L3 = k3L, where L3 is the third spraying rate, 30% < k3 ≤ 50%, and L is the preset standard spraying rate. For example, k3 can be equal to but not limited to 40% or 50%, etc., which is not limited herein. Among them, the preset peak temperature can be but not limited to 600°C or 680°C, etc., which is not limited herein, and the preset peak temperature is at least 30°C higher than the average temperature during the period when the temperature change amplitude of the raw gas is less than the preset temperature amplitude. The second preset duration can be 1h, 2h, or 4h, which is not limited herein.

[0043] Among them, when the temperature of the raw gas reaches the preset peak temperature or continuously drops within the previous second preset duration, it indicates that the coal mine is in the late carbonization stage, and there is less uncarbonized coal mine and less raw gas generated. Therefore, the main controller 101 can control the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the third spraying rate, where the third spraying rate is lower than the first spraying rate.

[0044] In addition, after S203, the method provided by the embodiments of the present application may further include:

[0045] When the temperature of the raw gas is lower than the preset second temperature (such as 500°C), or the current working time of the coke oven carbonization chamber 105 accounts for more than 80% of the preset total working time, it can also be said that the coal mine is in the final carbonization stage, there are fewer coal mines that have not been carbonized, and the raw gas produced is also less, so the coolant spraying module 104 is controlled to spray coolant into the gas delivery pipeline 102 based on the third spraying rate.

[0046] In addition, in the flow direction of the raw gas, the temperature sensor 103 is located before the coolant spraying module 104. In this way, the temperature of the raw gas before being cooled can be accurately measured.

[0047] According to the inventor's test, when the standard spraying rate of the coolant is 1587m 3 / h; when the coking time of the coke oven carbonization chamber 105 is 28 hours, from the start of coal loading in the coke oven carbonization chamber 105 to 9 hours and 20 minutes, L1 = 70% L, that is, L1 = 1111m3 / h. When the temperature of the raw gas reaches 560°C, and the temperature change of the raw gas in the first preset time period is less than the preset 3 degrees Celsius, then 16 hours and 48 minutes have passed since the start of coal loading in the coke oven carbonization chamber 105, and L2 = 120% L, L2 = 1905m3 / h. When the raw gas temperature is lower than 500°C, and the raw gas temperature shows a continuous downward trend within 5 minutes, the recorded coking time is 26:00, and then L3 = 50% L, until the coke is pushed.

[0048] In addition, an embodiment of the present application also provides a raw gas cooling system, including a main controller 101, a gas transmission pipeline 102, a temperature sensor 103 and a coolant spraying module 104 arranged in the gas transmission pipeline 102, the temperature sensor 103 is used to collect the temperature of the raw gas overflowing from the coke oven carbonization chamber 105 in the gas transmission pipeline 102; the main controller 101 is used to execute the method executed by the main controller 101 in the above embodiment of the present application.

[0049] In summary, the embodiments of the present application provide a method and system for cooling raw gas. Upon receiving a startup command from the coke oven carbonization chamber 105, indicating that the coal mine is in the initial carbonization stage, the main controller 101 controls the coolant spraying module 104 to spray coolant into the gas delivery pipeline 102 at a first spraying rate, wherein the first spraying rate is lower than a preset standard spraying rate. During the initial carbonization stage, the temperature within the coke oven carbonization chamber 105 is relatively low, and the amount of raw gas produced is relatively low. Therefore, the coolant spraying module 104 can spray at a rate lower than the preset standard spraying rate. This saves coolant, reduces costs, and reduces the raw gas to a suitable temperature.

[0050] When the temperature of the raw gas reaches a preset first temperature and the temperature change amplitude of the raw gas within the previous first preset time period is less than the preset temperature amplitude, the main controller 101 indicates that the coal mine is in the mid-term carbonization stage. At this time, the temperature in the coke oven carbonization chamber 105 is high and the raw gas generated is high. The main controller 101 controls the coolant spraying module 104 to spray coolant into the gas transmission pipeline 102 based on the second spraying rate, wherein the second spraying rate is higher than the preset standard spraying rate. The coolant spraying module 104 can spray at a rate higher than the preset standard spraying rate, which can reduce the raw gas to a suitable temperature without causing waste of coolant.

[0051] When the temperature of the raw coal gas reaches a preset peak temperature or continuously decreases within the previous second preset time period, the main controller 101 indicates that the coal mine is in the final carbonization stage, there are fewer coal mines that have not been carbonized, and less raw coal gas is produced. Therefore, the coolant spraying module 104 can be controlled to spray coolant into the gas transmission pipeline 102 based on the third spraying rate, wherein the third spraying rate is lower than the first spraying rate.

[0052] While the above description does not provide detailed technical details regarding the patterning of each layer, those skilled in the art will appreciate that various technical means can be employed to form layers, regions, and the like in desired shapes. Furthermore, those skilled in the art may devise methods that differ from those described above to achieve the same structure. Furthermore, while each embodiment has been described separately, this does not mean that the measures in each embodiment cannot be advantageously combined.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional 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 application.

[0054] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for cooling raw gas, characterized in that: Applied to the raw gas cooling system, the raw gas cooling system includes a main controller, a gas transmission pipeline, a temperature sensor disposed in the gas transmission pipeline, and a coolant spraying module. The method includes: When the main controller receives a start instruction of the coke oven carbonization chamber, it controls the coolant spraying module to spray coolant into the gas transmission pipeline based on a first spraying rate, where the first spraying rate is lower than a preset standard spraying rate; The temperature sensor collects the temperature of the raw gas overflowing from the coke oven carbonization chamber in the gas transmission pipeline; When the temperature of the raw gas reaches a preset first temperature and the temperature change range of the raw gas is less than a preset temperature range within a previous first preset duration, the main controller controls the coolant spraying module to spray coolant into the gas transmission pipeline based on a second spraying rate, where the second spraying rate is higher than the preset standard spraying rate; When the temperature of the raw gas reaches a preset peak temperature or continuously decreases within a previous second preset duration, the main controller controls the coolant spraying module to spray coolant into the gas transmission pipeline based on a third spraying rate, where the third spraying rate is lower than the first spraying rate.

2. The method according to claim 1, characterized in that The first spraying rate satisfies the formula L1 = k1L, where L1 is the first spraying rate, 50% < k1 < 90%, and L is the preset standard spraying rate.

3. The method according to claim 1, characterized in that The second spraying rate satisfies the formula L2 = k2L, where L2 is the second spraying rate, 100% < k2 < 130%, and L is the preset standard spraying rate.

4. The method according to claim 1, wherein The third spraying rate satisfies the formula L3 = k3L, where L3 is the third spraying rate, 30% < k3 ≤ 50%, and L is the preset standard spraying rate.

5. The method according to claim 1, wherein After controlling the coolant spraying module to spray coolant into the gas transmission pipeline based on the second spraying rate, the method further includes: When the temperature of the raw gas is lower than a preset second temperature, or the ratio of the current working duration of the coke oven carbonization chamber to the preset total working duration is greater than 80%, controlling the coolant spraying module to spray coolant into the gas transmission pipeline based on the third spraying rate.

6. The method according to claim 1, characterized in that The coolant is ammonia water, and the temperature sensor is disposed outside the gas transmission pipeline.

7. The method according to claim 1, characterized in that In the flow direction of the raw gas, the temperature sensor is located before the coolant spraying module.

8. The method according to claim 1, characterized in that The value range of the first temperature is 480°C - 600°C.

9. The method according to any one of claims 1 to 8, characterized in that: The preset temperature range is 3°C - 15°C.

10. A raw gas cooling system, characterized in that: It includes a main controller, a gas transmission pipeline, a temperature sensor disposed in the gas transmission pipeline, and a coolant spraying module. The temperature sensor is used to collect the temperature of the raw gas overflowing from the coke oven carbonization chamber in the gas transmission pipeline; the main controller is used to execute the method executed by the main controller in any one of claims 1 - 9.

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