Coking furnace waste heat recovery system

Abstract

The utility model relates to a waste heat recovery system of a coking furnace, which comprises the coking furnace, and a smoke outlet of the coking furnace is respectively connected with a sleeve type chimney through a smoke exhaust pipeline and is connected with a plurality of preheaters through a waste heat recovery pipeline. The air inlet of each coking furnace is connected with an air conveying pipeline, and the pipeline passes through an air preheater. According to the system, valves are arranged on the smoke exhaust pipeline and the waste heat recovery pipeline and used for controlling the flow direction and flow of smoke. The air inlet pipeline group is arranged at the air inlet, so that air sources can be flexibly switched, and stable operation of the coking furnace is ensured. The preheaters are connected through a flue connecting pipeline and a preheating connecting pipeline, the preheater at the head end is connected with an air blower, and multi-stage heat exchange is achieved. The system not only improves the waste heat recovery efficiency, but also reduces the number of equipment and the construction cost, responds to the green and environment-friendly requirements, has multiple operation modes, can be flexibly switched according to production requirements, and has remarkable economic and environmental benefits.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of waste heat recovery, especially relates to a coking furnace waste heat recovery system. BACKGROUND

[0002] In the production process of the coking furnace, a large amount of high-temperature flue gas will be generated, which contains abundant heat. If it is directly discharged, not only the energy will be wasted, but also the environment will be affected to a certain extent. At present, although there are some waste heat recovery equipment in the market, its structure is complex, the recovery efficiency is low, and the operation is inconvenient, which cannot meet the demand in actual production. In addition, the existing waste heat recovery system can usually only work in a fixed operation mode, and cannot flexibly switch the operation mode according to the actual production situation, which limits the application range and economic benefits of the waste heat recovery system to a certain extent. UTILITY MODEL CONTENT

[0003] (I) Utility model purpose

[0004] In order to overcome the above shortcomings, the purpose of the utility model is to provide a coking furnace waste heat recovery system to solve the above technical problems.

[0005] (II) Technical scheme

[0006] In order to achieve the above purpose, the technical scheme provided by the present application is as follows:

[0007] A coking furnace waste heat recovery system, comprising at least one coking furnace, the smoke outlet of each coking furnace is connected with a sleeve type chimney through a smoke exhaust pipeline, the smoke outlet of each coking furnace is connected with a preheater through a waste heat recovery pipeline, the air inlet of each coking furnace is connected with an air conveying pipeline, and the air conveying pipeline passes through the preheater.

[0008] Preferably, the smoke exhaust pipeline of each coking furnace is provided with a smoke exhaust valve, the waste heat recovery pipeline of each coking furnace is provided with a recovery valve, and the air inlet of the coking furnace is provided with an air inlet pipeline group connected with the air conveying pipeline.

[0009] Preferably, the air inlet pipeline group comprises an air inlet pipe connected with the air conveying pipeline and a standby pipe connected with the atmosphere, the air inlet pipe is provided with an air inlet valve, and the standby pipe is provided with a standby valve.

[0010] Preferably, the preheater is provided with a plurality of preheaters, the flue outlet of the preheater is provided with an induced draft fan, the flue outlet and the flue inlet of adjacent preheaters are connected through a flue connecting pipeline, the preheating pipe inlet of the preheater is connected with the preheating pipe outlet of adjacent preheaters through a preheating connecting pipeline, and the preheating pipe inlet of the first end preheater is connected with a blower.

[0011] Preferably, the preheater comprises a preheating shell, a flue inlet and a flue outlet are arranged at two ends of the preheating shell respectively, a preheating cavity is formed in the preheating shell, a detachable upper top plate is arranged at the upper end of the preheating shell, and a preheating pipe is fixedly arranged on the upper top plate and is arranged in the preheating cavity in a meandering manner.

[0012] Preferably, the upper top plate is connected with the preheating shell through bolts, and a lifting plate is arranged on the upper top plate and is provided with a lifting hole.

[0013] Preferably, a liquid outlet pipe is arranged below the preheating shell, and a liquid outlet valve is arranged on the liquid outlet pipe.

[0014] Beneficial effects:

[0015] 1. The coking furnace top direct discharge to the atmosphere is cancelled, an air preheater is added, the air temperature for combustion is increased, a large amount of fuel gas is saved, and the comprehensive economic benefit is effectively improved.

[0016] 2. Through the feasible flue gas preheating design, the energy consumption is successfully saved, and the cost is truly reduced and the benefit is increased.

[0017] 3. Multiple furnace chambers are combined, the number of air preheaters, blowers, induced draft fans and other equipment is reduced, and the cost is reduced.

[0018] 4. Single coking furnace independent operation can be realized, the layout is reasonable, and control is convenient.

[0019] 5. The induced draft fan is arranged between the high-temperature section of the air preheater and the low-temperature section of the air preheater, the flue gas temperature at the induced draft fan is increased, and the problem of flue gas dew point corrosion of the induced draft fan is solved.

[0020] 6. Single coking furnace operation can be realized while another coking furnace is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a structural schematic view of the utility model;

[0022] Fig. 2 is an internal structure view of the preheater according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the following combines specific implementation manners and refers to the drawings Figs. 1-2 , the utility model is further described. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0024] Embodiment 1

[0025] The utility model provides a kind of coking furnace waste heat recovery system, including a coking furnace 1, the smoke outlet of the coking furnace 1 is connected with sleeve type chimney 3 by smoke exhaust pipeline 2, the smoke outlet of the coking furnace 1 is connected with a preheater 5 by waste heat recovery pipeline 4, the air inlet of the coking furnace 1 is connected with air delivery pipeline 9, the air delivery pipeline 9 passes through air preheater 5.

[0026] The smoke exhaust pipeline 2 of the coking furnace 1 is equipped with smoke exhaust valve, the setting of smoke exhaust valve can accurately control the discharge amount of flue gas, avoid flue gas disorderly discharging, reduce the waste of heat, facilitate cutting off flue gas circulation when equipment maintenance or overhaul, ensure operation safety.In normal operation, according to the heat exchange efficiency of preheater 5 and the production demand of coking furnace 1, the opening of smoke exhaust valve is adjusted, so that flue gas flow reaches the best state;When equipment is stopped or maintained, close the smoke exhaust valve and cut off the flue gas passage.

[0027] The waste heat recovery pipeline 4 of the coking furnace 1 is equipped with recovery valve, recovery valve can flexibly control the flow of flue gas into preheater 5, facilitate adjusting the efficiency of waste heat recovery under different working conditions, at the same time, when preheater 5 fails or needs maintenance, flue gas can be quickly cut off to ensure the safe operation of the system and prevent high-temperature flue gas from damaging other equipment.

[0028] Air inlet pipe line group connected with air delivery pipeline is equipped at the air inlet of the coking furnace 1.The setting of air inlet pipe line group makes the air inlet mode of coking furnace more flexible and diverse, different air inlet modes can be selected according to actual production demand, improve the adaptability and reliability of the system, at the same time, when air delivery pipeline has problem, air can be obtained from atmosphere through standby pipe to ensure the normal operation of coking furnace and avoid production interruption.The air inlet pipe line group includes air inlet pipe connected with air delivery pipeline and standby pipe connected with atmosphere, air inlet valve is equipped on the air inlet pipe, and standby valve is equipped on the standby pipe.

[0029] In normal production, open the air inlet valve on air inlet pipe 12, so that preheated air enters coking furnace 1 through air delivery pipeline 9;When air delivery pipeline 9 fails or needs maintenance, close the air inlet valve and open the standby valve on standby pipe, so that coking furnace obtains air from atmosphere to maintain the continuity of production process.

[0030] Induced draft fan 6 is equipped at the flue outlet of preheater 5, and the preheating pipe inlet of preheater 5 is connected with air blower.

[0031] Embodiment 2

[0032] The coking furnace waste heat recovery system comprises two coking furnaces 1, the smoke outlet of each coking furnace 1 is connected with a sleeve type chimney 3 through a smoke discharge pipeline 2, the smoke outlet of each coking furnace 1 is connected with a preheater 5 through a waste heat recovery pipeline 4, the air inlet of each coking furnace 1 is connected with an air delivery pipeline 9, and the air delivery pipeline 9 passes through the air preheater 5. A smoke discharge valve is arranged on the smoke discharge pipeline 2 of each coking furnace 1, a recovery valve is arranged on the waste heat recovery pipeline 4 of each coking furnace, and an air inlet pipeline group connected with the air delivery pipeline is arranged at the air inlet of the coking furnace 1. The air inlet pipeline group comprises an air inlet pipe 12 connected with the air delivery pipeline and a standby pipe 11 connected with the atmosphere, the air inlet pipe 12 is provided with an air inlet valve, and the standby pipe 11 is provided with a standby valve.

[0033] The preheater 5 is provided in plurality, the flue outlet of the preheater 5 is provided with an induced draft fan 6, the flue outlet and the flue inlet of adjacent preheaters 5 are connected through a flue connecting pipeline 10, the preheating pipe inlet of the preheater 5 is connected with the preheating pipe outlet of the adjacent preheater 5 through a preheating connecting pipeline 7, and the preheating pipe inlet of the first end preheater 5 is connected with a blower.

[0034] The preheater 5 comprises a preheating shell 58, the two ends of the preheating shell 58 are respectively a flue inlet 56 and a flue outlet 53, a preheating cavity 55 is formed in the preheating shell 58, and a detachable upper top plate 57 is arranged at the upper end of the preheating shell 58. The preheating shell 58 is provided with a preheating pipe 51 fixedly arranged on the upper top plate 57, and the preheating pipe 51 is arranged in the preheating cavity 55 in a meandering manner. The upper top plate 57 is connected with the preheating shell 58 through bolts, the upper top plate 57 is provided with a hoisting plate 52, and the hoisting plate 52 is provided with a hoisting hole. A liquid outlet pipe 54 is arranged below the preheating shell 58, and a liquid outlet valve is arranged on the liquid outlet pipe 54.

[0035] The coking furnace waste heat recovery system is designed through series connection and parallel connection of multiple preheaters, which significantly improves the waste heat recovery efficiency, and realizes multiple flexible operation modes, including A furnace single operation, B furnace single operation and AB furnace simultaneous operation. The system can be flexibly switched according to production requirements, greatly improving the adaptability and reliability of the system. In addition, the system adopts the air inlet pipeline group design, which can quickly switch the air source to ensure the stable operation of the coking furnace; the detachable upper top plate and the hoisting design of the preheater facilitate maintenance and repair, and reduce the maintenance cost. Overall, the system not only reduces energy consumption and responds to the green environmental protection requirements, but also reduces the number of equipment and construction cost, and has significant economic and environmental benefits.

[0036] Before the system starts, the equipment connection and valve state should be comprehensively checked to ensure no leakage. Then, the blower and induced draft fan are started in turn to provide power for the preheating system and maintain smooth flow of flue gas. During operation, the exhaust valve and recovery valve are precisely adjusted according to the production requirements of the coking furnace and the working condition of the preheater to control the flow and direction of flue gas, while the temperature is monitored in real time to ensure the heat exchange efficiency. During maintenance, the preheater ash is cleaned regularly, the pipeline sealing is checked, and the fan is ensured to operate normally. During shutdown maintenance, all valves are closed, the top plate of the preheater is disassembled for maintenance, and the liquid is emptied to prevent equipment corrosion.

[0037] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that includes the recited element.

[0038] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coke oven waste heat recovery system characterized by, The coke furnace comprises at least one coke furnace, the smoke outlet of each coke furnace is connected with a sleeve chimney through a smoke exhaust pipeline, the smoke outlet of each coke furnace is connected with a preheater through a waste heat recovery pipeline, and the air inlet of each coke furnace is connected with an air delivery pipeline.

2. A coking furnace waste heat recovery system according to claim 1, characterized in that, The smoke exhaust pipeline of each coke furnace is provided with a smoke exhaust valve, the waste heat recovery pipeline of each coke furnace is provided with a recovery valve, and the air inlet of each coke furnace is provided with an air inlet pipeline group connected with the air delivery pipeline.

3. A coker waste heat recovery system according to claim 2, wherein, The air inlet pipeline group comprises an air inlet pipe connected with the air delivery pipeline and a standby pipe connected with the atmosphere, the air inlet pipe is provided with an air inlet valve, and the standby pipe is provided with a standby valve.

4. A coke oven heat recovery system according to claim 1, wherein The preheater is provided with a plurality of air inlets, the flue outlet of each preheater is provided with an induced draft fan, the flue outlet of each preheater is connected with the flue inlet of the next preheater through a flue connecting pipeline, the preheating pipe inlet of each preheater is connected with the preheating pipe outlet of the next preheater through a preheating connecting pipeline, and the preheating pipe inlet of the first preheater is connected with a blower.

5. A coker waste heat recovery system as claimed in claim 1, wherein, The preheater comprises a preheating shell, the two ends of the preheating shell are respectively a flue inlet and a flue outlet, a preheating cavity is formed in the preheating shell, the upper end of the preheating shell is provided with a detachable upper top plate, a preheating pipe is fixedly arranged on the upper top plate, and the preheating pipe is arranged in the preheating cavity in a meandering manner.

6. A coker waste heat recovery system according to claim 5 wherein, The upper top plate and the preheating shell are connected through bolts, the upper top plate is provided with a lifting plate, and the lifting plate is provided with a lifting hole.

7. A coke oven heat recovery system according to claim 5, wherein The lower portion of the preheating shell is provided with a liquid outlet pipe, and the liquid outlet pipe is provided with a liquid outlet valve.

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