Coke oven flue gas waste heat recycling device
By introducing multiple evaporators and controllers into the coke oven flue gas system, combined with economizers and steam compressors, the problem of unrecovered waste heat from coke oven flue gas was solved, achieving efficient waste heat utilization and cost savings.
Patent Information
- Application Number
- CN202520465669.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Even after desulfurization and dust removal, a significant amount of residual heat in the coke oven flue gas is still lost, and existing equipment fails to effectively recover it, leading to increased energy consumption and costs.
Multiple evaporators are used for heat exchange at different locations, combined with an economizer, steam drum, and steam compressor to convert the heat in the flue gas into steam and feed it into the pipeline network. The controller coordinates the switching of evaporators and valves to achieve efficient heat recovery.
It improves the utilization rate of waste heat, reduces coke oven energy consumption and steam costs, and achieves efficient recovery and utilization of flue gas waste heat.
Smart Images
Figure CN223807616U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model application relates to the technical field of waste heat recycling, in particular to a coke oven flue gas waste heat recycling device. BACKGROUND
[0002] The coke oven flue gas temperature is 290-300 DEG C, in order to ensure the desulfurization effect and prevent burning loss and improve filter bag service life, the desulfurization temperature and dust remover filter bag temperature should be controlled at 240-250 DEG C, in order to meet the requirement, the coke oven flue gas is added heat exchanger and cooling equipment before entering desulfurization dust remover, in this way, a large amount of waste heat is wasted, simultaneously, heat exchanger and cooling equipment increase soft water and energy consumption, the flue gas after denitration dust removal treatment leaves the outlet end of denitration dust remover, and the temperature is about 220 DEG C, these flue gases are directly discharged through the induced draft fan through the coke oven chimney, and the heat carried by the flue gas is directly lost, in order to improve the above-mentioned heat loss problem, in the prior art, the economizer is connected with the outlet end of the denitration dust remover and is arranged, the flue gas after denitration dust removal treatment is further introduced into the economizer, the flue gas is heated to the boiler feed water, the feed water is preheated, thereby achieving the purpose of reducing energy consumption, but the flue gas after passing through the economizer and being discharged still carries a large amount of heat, and direct discharge still causes great heat loss.
[0003] Therefore, the present application aims to design a flue gas waste heat recycling device, improve the waste heat utilization rate, and save costs. CONTENT OF THE UTILITY MODEL
[0004] In view of the defects of the prior art, the utility model aims to provide a coke oven flue gas waste heat recycling device, which can realize flue gas waste heat recycling, improve the waste heat utilization rate, and save costs.
[0005] The utility model discloses a technical scheme adopted by the device is: a coke oven flue gas waste heat recycling device, including coke oven, the flue gas export end of coke oven is connected with desulfurization dust remover through first connecting pipe, the export end of desulfurization dust remover is connected with coal economizer through second connecting pipe, the waterway export end of coal economizer is connected with first steam drum through third connecting pipe, the waterway export end of first steam drum is connected with coke oven, first connecting pipe is connected with first evaporimeter through three -way electromagnetic valve, the flue gas export end of first evaporimeter is connected with second evaporimeter through pipeline, the flue gas export end of second evaporimeter is connected with first connecting pipe through three -way electromagnetic valve, second connecting pipe is connected with third evaporimeter through three -way electromagnetic valve, the flue gas output end of third evaporimeter is connected with second connecting pipe through three -way electromagnetic valve, the flue gas export end of coal economizer is connected with fourth evaporimeter, the waterway import end of coal economizer is connected with oxygen remover, the top of first evaporimeter, second evaporimeter, third evaporimeter, fourth evaporimeter is all provided with steam export, steam export is connected with cut -out valve, cut -out valve is connected with check valve through pipeline, check valve is connected with steam input pipeline through pipeline, steam input pipeline is connected with second steam drum, the steam output end of second steam drum is connected with steam compressor, the output end of steam compressor is connected with external steam pipe network.
[0006] Further, the waterway export end of the second steam drum is connected with the oxygen remover through a pipeline.
[0007] Further, the flue gas export end of the fourth evaporimeter is connected with a discharge connecting pipe.
[0008] Further, a check valve is arranged on the connecting pipeline between the second steam drum and the steam compressor.
[0009] Further, a first temperature sensor is arranged on the first connecting pipe close to the import end of the desulfurization dust remover.
[0010] Further, a controller is further included, and the controller is electrically connected with the cut -out valve, the check valve, the three -way electromagnetic valve, the desulfurization dust remover, the coal economizer, the oxygen remover, the first steam drum, the second steam drum, the steam compressor, the first evaporimeter, the second evaporimeter, the third evaporimeter and the fourth evaporimeter respectively.
[0011] Further, the waterway import end of the first evaporimeter, the second evaporimeter, the third evaporimeter and the fourth evaporimeter is connected with an external water source respectively.
[0012] Further, the working states of the first evaporimeter and the second evaporimeter are synchronous.
[0013] The utility model discloses a device has beneficial effect is:
[0014] 1. The utility model discloses a plurality of evaporators in different positions carries out heat exchange, and cooperate coal economizer, steam pocket, steam compressor with the steam of heat exchange and into the pipe network, not only reduce the energy consumption of coke oven, and further improve the heat utilization rate, reduce the steam cost, realize the flue gas waste heat recycling, improve the waste heat utilization rate, save the function of cost. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the structure schematic diagram of the utility model.
[0016] The figure mark explains: 1 - coke oven;2 - three -way electromagnetic valve;3 - first evaporator;4 - check valve;5 - cut - off valve;6 - steam input pipeline;7 - second evaporator;8 - third evaporator;9 - fourth evaporator;10 - discharge connecting pipe;11 - second steam pocket;12 - steam compressor;13 - deaerator;14 - coal economizer;15 - desulfurization dust remover;16 - first steam pocket. DETAILED DESCRIPTION
[0017] The utility model device will be further described below in conjunction with specific embodiment, and these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model. In addition, it should be understood that after reading the content of the utility model device teaching, the person skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope of the appended claims of the application.
[0018] See Figure 1 It is the structure schematic diagram of the utility model, and a coke oven 1 flue gas waste heat recycling device, including coke oven 1, the flue gas export end of coke oven 1 is connected with desulfurization dust remover 15 through first connecting pipe, carries out desulfurization and dust removal treatment through desulfurization dust remover 15, and the export end of desulfurization dust remover 15 is connected with coal economizer 14 through second connecting pipe, and the role of coal economizer 14 is to utilize the waste heat of flue gas to heat the water in the inside of coal economizer 14, and the water road export end of coal economizer 14 is connected with first steam pocket 16 through third connecting pipe, and the water that passes through first steam pocket 16 and enters coke oven 1 through the heating of coal economizer 14, and the water road export end of first steam pocket 16 is connected with coke oven 1.
[0019] The first connecting pipe is connected with the first evaporator 3 through the three-way electromagnetic valve 2, the flue gas outlet end of the first evaporator 3 is connected with the second evaporator 7 through a pipeline, the flue gas outlet end of the second evaporator 7 is connected with the first connecting pipe through the three-way electromagnetic valve 2, the two three-way electromagnetic valves 2 on the first connecting pipe switch the passage state, so that the high-temperature flue gas discharged from the coke oven 1 first enters the first evaporator 3, absorbs and exchanges heat through the first evaporator 3, generates steam, and then enters the second evaporator 7 connected with the first evaporator 3, and the second evaporator 7 further exchanges heat to generate steam, because the flow speed of the flue gas is very fast, so the flue gas leaving the second evaporator 7 also carries a large amount of heat.
[0020] The second connecting pipe is connected with the third evaporator 8 through the three-way electromagnetic valve 2, the flue gas output end of the third evaporator 8 is connected with the second connecting pipe through the three-way electromagnetic valve 2, the flue gas outlet end of the economizer 14 is connected with the fourth evaporator 9, the two three-way electromagnetic valves 2 on the second connecting pipe switch the passage state, so that the flue gas enters the third evaporator 8 for heat exchange to generate steam after leaving the desulfurization and dust removal device 15.
[0021] The water inlet end of the economizer 14 is connected with the deaerator 13, the deaerator 13 removes dissolved oxygen and other gases in water to prevent equipment corrosion, and usually the boiler feed water enters the deaerator 13 for deaeration before entering the boiler, the top of the first evaporator 3, the second evaporator 7, the third evaporator 8 and the fourth evaporator 9 is provided with a steam outlet, the steam outlet is connected with a shut-off valve 5, the shut-off valve 5 is connected with a check valve 4 through a pipeline to prevent steam backflow, the check valve 4 is connected with a steam input pipeline 6 through a pipeline, the steam input pipeline 6 is connected with a second steam drum 11, the second steam drum 11 and the first steam drum 16 are the same and are mainly used for steam-water separation, the steam output end of the second steam drum 11 is connected with a steam compressor 12, the steam compressor 12 adjusts the pressure of the steam generated by the evaporator to meet the conditions of entering the steam pipe network, and the output end of the steam compressor 12 is connected with the external steam pipe network.
[0022] The water outlet end of the second steam drum 11 is connected with the deaerator 13 through a pipeline, and the separated condensed water is mixed with the water passing through the deaerator 13.
[0023] The flue gas outlet end of the fourth evaporator 9 is connected with a discharge connecting pipe 10, after the heat exchange treatment of the four evaporators and the economizer 14, the heat carried by the flue gas of the coke oven 1 is basically exchanged and utilized, and the remaining residual heat is less and directly discharged without causing large heat loss.
[0024] A check valve 4 is arranged on the connecting pipeline between the second steam drum 11 and the steam compressor 12.
[0025] The first connecting pipe is provided with a first temperature sensor near the inlet end of the desulfurization dust collector 15. In order to prolong the service life of the desulfurization dust collector 15, the temperature of the flue gas entering the desulfurization dust collector 15 should be controlled below 250 DEG C. The first temperature sensor is arranged to detect the temperature of the flue gas at the inlet end of the desulfurization dust collector 15 in real time, so as to prevent the desulfurization dust collector 15 from being damaged.
[0026] The controller is electrically connected with the cut-off valve 5, the check valve 4, the three-way electromagnetic valve 2, the desulfurization dust collector 15, the economizer 14, the deaerator 13, the first steam drum 16, the second steam drum 11, the steam compressor 12, the first evaporator 3, the second evaporator 7, the third evaporator 8 and the fourth evaporator 9 respectively. The controller collects signals of the electronic elements and controls the electronic elements. The controller comprises a touch display screen and can be set and monitored.
[0027] The water inlet ends of the first evaporator 3, the second evaporator 7, the third evaporator 8 and the fourth evaporator 9 are connected with external water sources, so that the internal water can be supplemented.
[0028] The first evaporator 3 and the second evaporator 7 are in synchronous working state and can be used simultaneously or not used simultaneously. The third evaporator 8 and the fourth evaporator 9 can be selectively used. If the fourth evaporator 9 is not used, no water is arranged in the fourth evaporator 9, and the flue gas leaving the economizer 14 directly passes through the fourth evaporator 9 and is discharged from the discharge connecting pipe 10.
[0029] The utility model discloses a plurality of evaporators are used to heat exchange at different positions, and cooperate with the economizer 14, the steam drum and the steam compressor 12 to integrate the steam obtained by heat exchange into the pipe network. The utility model not only reduces the energy consumption of the coke oven 1, but also further improves the heat utilization rate, reduces the steam cost, realizes the flue gas waste heat recycling, improves the waste heat utilization rate and saves the cost.
Claims
1. A coke oven (1) flue gas waste heat recovery device, comprising a coke oven (1), the flue gas outlet end of the coke oven (1) is connected with a desulfurization dust collector (15) through a first connecting pipe, the outlet end of the desulfurization dust collector (15) is connected with an economizer (14) through a second connecting pipe, the water outlet end of the economizer (14) is connected with a first steam drum (16) through a third connecting pipe, and the water outlet end of the first steam drum (16) is connected with the coke oven (1), characterized in that: The first connecting pipe is connected with the first evaporator (3) through the three-way electromagnetic valve (2), the flue gas outlet end of the first evaporator (3) is connected with the second evaporator (7) through a pipeline, the flue gas outlet end of the second evaporator (7) is connected with the first connecting pipe through the three-way electromagnetic valve (2), the second connecting pipe is connected with the third evaporator (8) through the three-way electromagnetic valve (2), the flue gas outlet end of the third evaporator (8) is connected with the second connecting pipe through the three-way electromagnetic valve (2), the flue gas outlet end of the economizer (14) is connected with the fourth evaporator (9), the water inlet end of the economizer (14) is connected with the deaerator (13), the top of the first evaporator (3), the second evaporator (7), the third evaporator (8) and the fourth evaporator (9) is provided with a steam outlet, the steam outlet is connected with the cut-off valve (5), the cut-off valve (5) is connected with the check valve (4) through a pipeline, the check valve (4) is connected with the steam input pipeline (6) through a pipeline, the steam input pipeline (6) is connected with the second steam drum (11), the steam output end of the second steam drum (11) is connected with the steam compressor (12), and the output end of the steam compressor (12) is connected with an external steam pipe network.
2. A flue gas waste heat recovery and utilization device for a coke oven (1) according to claim 1, characterized in that: The water outlet end of the second steam drum (11) is connected with the deaerator (13) through a pipeline.
3. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: The flue gas outlet end of the fourth evaporator (9) is connected with the discharge connecting pipe (10).
4. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: A check valve (4) is arranged on the connecting pipeline between the second steam drum (11) and the steam compressor (12).
5. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: A first temperature sensor is arranged near the inlet end of the desulfurization dust remover (15).
6. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: A controller is further included, which is electrically connected with the cut-off valve (5), the check valve (4), the three-way electromagnetic valve (2), the desulfurization dust remover (15), the economizer (14), the deaerator (13), the first steam drum (16), the second steam drum (11), the steam compressor (12), the first evaporator (3), the second evaporator (7), the third evaporator (8) and the fourth evaporator (9).
7. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: The water inlet end of the first evaporator (3), the second evaporator (7), the third evaporator (8) and the fourth evaporator (9) is connected with an external water source.
8. The flue gas waste heat recovery device for coke oven (1) according to claim 1, characterized in that: The working states of the first evaporator (3) and the second evaporator (7) are synchronized.