A device for using waste heat from coke oven riser pipes to condition coal moisture.

Abstract

This utility model relates to a device for using waste heat from a coke oven riser pipe for coal moisture conditioning, including heat exchanger a, a distributor, heat exchanger b, a coke oven riser pipe, heat exchanger d, and heat exchanger c. Heat exchanger d is installed on the coke oven riser pipe. The outlet pipe of heat exchanger d, containing heat exchange medium A, is connected to heat exchanger b. After heat exchange in heat exchanger b, heat exchange medium A is sent to heat exchanger a through a pipe. Heat exchanger a is located below the distributor. After heat exchange in heat exchanger a, heat exchange medium A, having exchanged heat with coking coal, is then sent to heat exchanger c through a pipe. The outlet pipe of heat exchanger c, containing heat exchange medium A, is connected to heat exchanger d. This utility model recovers waste heat from the raw coal gas in the coke oven riser pipe and then uses the recovered waste heat for heat exchange, heating, and moisture reduction of the coking coal in the coal moisture conditioning process. By fully utilizing the principle of proximity, the waste heat recovery from the coke oven riser pipe and the coking coal moisture conditioning process are connected in series. This results in a relatively short process pipeline, less heat loss, and improved waste heat utilization.

Description

Technical Field

[0001] This utility model belongs to the field of coking technology, and in particular relates to a device for using waste heat from the coke oven riser pipe to condition the moisture of coal. Background Technology

[0002] The coking industry is a major energy consumer, with energy consumption in the coking process reaching 180-200 kg of standard coal equivalent per ton, accounting for 70%-80% of the total energy consumption in coking production. Looking at the heat balance distribution in the coking process, the sensible heat (high-temperature waste heat) carried out from the 950℃-1050℃ red-hot coke exiting the coke oven carbonization chamber accounts for 37% of the coke oven's heat expenditure, while the heat carried out from the 650℃-750℃ raw coke gas (medium-temperature waste heat) accounts for 36%. Currently, the common method used in coking plants to cool the raw coke gas is by spraying large amounts of circulating ammonia water at 70℃-75℃. Through the absorption of heat by the circulating ammonia water and its subsequent evaporation, the temperature of the raw coke gas is reduced to around 80℃ before entering the subsequent coal chemical product recovery and processing stage. As a result, the heat carried out by the raw coke gas is wasted, leading to a loss of the raw coke gas's thermal energy and increased water consumption. Coal moisture conditioning is a technology developed at the beginning of this century due to the scarcity of coking coal resources and energy. It involves removing some moisture from coking coal before it is charged into the coke oven, stabilizing the moisture content of the blended coal at around 6%. This increases coke oven output and reduces energy consumption and wastewater treatment volume during the coking process. Simultaneously, during coke production, the blended coal is heated and dry-distilled in the coke oven in an air-isolated environment, generating coke and producing a large amount of raw coal gas. However, currently, dehumidification is mainly achieved through external steam and coke oven flue gas. Utility Model Content

[0003] This invention provides a device for using waste heat from the coke oven riser pipe for coal moisture conditioning. By first recovering the waste heat resources of the raw coal gas in the coke oven riser pipe, and then using the recovered waste heat for heat exchange and temperature increase to reduce moisture in the coking coal in the coal moisture conditioning process, the waste heat recovery from the coke oven riser pipe and the coking coal moisture conditioning process are connected in series based on the principle of proximity. The process pipeline is relatively short, the heat loss is small, the waste heat utilization rate can be improved, and the coking energy consumption can be reduced.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A device for using waste heat from a coke oven riser pipe for coal moisture conditioning includes heat exchanger a, a distributor, heat exchanger b, a coke oven riser pipe, heat exchanger d, and heat exchanger c. Heat exchanger d is installed on the coke oven riser pipe. The outlet pipe of heat exchanger d is connected to heat exchanger b. After heat exchange in heat exchanger b, heat exchanger A is sent to heat exchanger a through a pipe. Heat exchanger a is located below the distributor. Heat exchanger A, after heat exchange with coking coal in heat exchanger a, is then sent to heat exchanger c through a pipe. The outlet pipe of heat exchanger c is connected to heat exchanger d.

[0006] A flow regulating valve a is installed on the inlet pipe of heat exchange medium B in heat exchanger b, a flow regulating valve b is installed on the inlet pipe of heat exchange medium C in heat exchanger c, a temperature detector a is installed on the outlet pipe of heat exchange medium A in heat exchanger b, and a temperature detector b is installed on the raw coal gas outlet pipe of the coke oven riser pipe. The flow regulating valve a, the flow regulating valve b, the temperature detector a, and the temperature detector b are respectively connected to a controller.

[0007] A pump is installed on the outlet pipe of the heat exchange medium A in the heat exchanger c.

[0008] The working principle of this utility model is as follows:

[0009] Temperature detector a detects the temperature T1 of heat exchange medium A from the coke oven riser pipe after passing through heat exchanger b, and transmits the real-time temperature signal to the controller. Temperature detector b detects the temperature T2 of the raw coal gas after heat exchange in heat exchanger d, and transmits the real-time temperature signal to the controller. The controller receives the signal T1 from temperature detector a, compares it with the set temperature range value, and issues a flow control valve a command to adjust the flow until the temperature measured by temperature detector a is within the set temperature range value; the controller receives the signal T2 from temperature detector b, compares it with the set temperature range value, and issues a flow control valve b command to adjust the flow until the temperature measured by temperature detector b is within the set temperature range value. By adjusting the temperature of heat exchange medium A entering heat exchanger a through heat exchanger b, the coking coal blend reaches the moisture adjustment target (6%-8%) after moisture conditioning. By adjusting the temperature of heat exchange medium A entering the waste heat heat exchanger d of the riser pipe through heat exchanger c, the raw coal gas temperature in the coke oven riser pipe decreases, and the raw coal gas temperature reaches 70℃-90℃, thus not affecting its output.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention first recovers the waste heat from the raw gas in the coke oven riser pipe, and then uses the recovered waste heat for heat exchange and temperature increase to reduce moisture in the coking coal during the coal moisture conditioning process. By fully utilizing the principle of proximity, the waste heat recovery from the coke oven riser pipe and the coal moisture conditioning process of the coking coal are connected in series. The process pipeline is relatively short, and the heat loss is small. It can make full use of the waste heat from the raw gas in the coke oven riser pipe to reduce the moisture in the coking coal and reduce the amount of heating gas used, thereby significantly reducing the energy consumption of the coking process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Feeder; 2. Heat exchanger a; 3. Temperature sensor a; 4. Flow control valve a; 5. Heat exchanger b; 6. Controller; 7. Pump; 8. Flow control valve b; 9. Temperature sensor b; 10. Heat exchanger c; 11. Coke oven riser pipe; 12. Heat exchanger d. Detailed Implementation

[0014] The present invention will be described in more detail through embodiments. These embodiments are merely descriptions of the best implementation of the present invention and do not limit the scope of the present invention in any way.

[0015] like Figure 1 As shown, a device for using waste heat from a coke oven riser pipe for coal conditioning includes heat exchanger a2, a distributor 1, heat exchanger b5, a coke oven riser pipe 11, heat exchanger d12, and heat exchanger c10. Heat exchanger d12 is installed on the coke oven riser pipe 11. The outlet pipe of heat exchanger d12, containing heat exchange medium A, is connected to heat exchanger b5. After heat exchange in heat exchanger b5, heat exchange medium A is sent to heat exchanger a2 through a pipe. Heat exchanger a2 is located below distributor 1. Heat exchange medium A, after heat exchange with coking coal in heat exchanger a2, is then sent to heat exchanger c10 through a pipe. The outlet pipe of heat exchange medium A in heat exchanger c10 is connected to heat exchanger d12. The outlet pipe of heat exchange medium A in heat exchanger b5 is connected to heat exchanger a2, and the outlet pipe of heat exchange medium A in heat exchanger a2 is connected to heat exchanger c10.

[0016] A flow regulating valve a4 is installed on the inlet pipe of heat exchange medium B in heat exchanger b5, a flow regulating valve b8 is installed on the inlet pipe of heat exchange medium C in heat exchanger c10, a temperature detector a3 is installed on the outlet pipe of heat exchange medium A in heat exchanger b5, and a temperature detector b9 is installed on the raw coal gas outlet pipe of coke oven riser 11. The flow regulating valve a4, the flow regulating valve b8, the temperature detector a3, and the temperature detector b9 are all electrically connected to the controller 6.

[0017] A pump 7 is installed on the outlet pipe of the heat exchange medium A in the heat exchanger d12.

[0018] Heat exchanger a2 is located below distributor 1 and receives coking coal transported by distributor 1. The coking coal passes from top to bottom through the vertical pipe of heat exchanger a2, and the heat exchange medium A from coke oven riser pipe 11 passes from bottom to top through the shell. The coking coal and the heat exchange medium A from coke oven riser pipe 11 exchange heat indirectly.

[0019] The specific implementation process is as follows:

[0020] 1. Before loading coal, test the moisture content W of the coking coal after passing through heat exchanger a2.

[0021] 2. When the moisture content of the coking coal reaches a value greater than the target after moisture adjustment, it indicates that the temperature T1 of the heat exchange medium A from the coke oven riser pipe 11 after passing through the heat exchanger b5 is too low, as detected by the existing temperature detector a3. The flow rate of the heat exchange medium B entering the heat exchanger b5 is reduced by the flow regulating valve a4 until the moisture content of the coking coal reaches a value within the target range (6%-8%). This temperature is then set as the target temperature of the heat exchange medium A by the controller 6, and the controller 6 controls the flow regulating valve a4 accordingly.

[0022] 3. When the moisture content of the coking coal is less than the target value after moisture adjustment, it indicates that the temperature T1 of the heat exchange medium A from the coke oven riser pipe 11 after passing through the heat exchanger b5 is too high, as detected by the existing temperature detector a3. The flow rate of the heat exchange medium B entering the heat exchanger b5 is increased by the flow regulating valve a4.

[0023] 4. The temperature T2 detected by the temperature detector b9 is within the target temperature range (70℃-90℃). Based on this, the controller 6 controls the flow regulating valve b8. When the temperature T2 is higher than the target temperature range (70℃-90℃), the flow rate of the heat exchange medium C entering the heat exchanger c10 is increased through the flow regulating valve b8 until T2 reaches the target temperature range (70℃-90℃).

[0024] 5. When T2 is lower than the target temperature range (70℃-90℃), reduce the flow rate of heat exchange medium C entering heat exchanger C10 through flow regulating valve b8 until T2 reaches within the target temperature range (70℃-90℃).

[0025] The above provides a detailed description of the manual ultrasonic flaw detection device for steel plates provided by this utility model. For those skilled in the art, improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on its technical solution and concept, should be included within the protection scope of this utility model.

Claims

1. A device for the use of coke oven uper pipe waste heat for coal moisture conditioning, characterized in that, The system includes heat exchanger a, a distributor, heat exchanger b, a coke oven riser pipe, heat exchanger d, and heat exchanger c. Heat exchanger d is installed on the coke oven riser pipe. The outlet pipe of heat exchanger d is connected to heat exchanger b. After heat exchange in heat exchanger b, heat exchanger A is sent to heat exchanger a through a pipe. Heat exchanger a is located below the distributor. Heat exchanger A, after heat exchange with coking coal in heat exchanger a, is then sent to heat exchanger c through a pipe. The outlet pipe of heat exchanger c is connected to heat exchanger d.

2. A device for coal moisture conditioning using coke oven uptake heat as claimed in claim 1 wherein, A flow regulating valve a is installed on the inlet pipe of heat exchange medium B in heat exchanger b, a flow regulating valve b is installed on the inlet pipe of heat exchange medium C in heat exchanger c, a temperature detector a is installed on the outlet pipe of heat exchange medium A in heat exchanger b, and a temperature detector b is installed on the raw coal gas outlet pipe of the coke oven riser pipe. The flow regulating valve a, the flow regulating valve b, the temperature detector a, and the temperature detector b are respectively connected to a controller.

3. A device for coal moisture conditioning using coke oven uptake heat as claimed in claim 1 wherein, A pump is installed on the outlet pipe of the heat exchange medium A in the heat exchanger c.

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