Coke quenching waste heat recovery system of box-type coke oven

Abstract

The embodiment of the utility model provides a box-type coke oven quenching waste heat recovery system which comprises a desalting water tank, a deaerator, a steam pocket, a box-type coke oven and a steam pipe network, the box-type coke oven comprises a quenching box evaporator, a water inlet of the quenching box evaporator is communicated with a water outlet of the steam pocket, and a water outlet of the steam pocket is communicated with a water outlet of the deaerator. Heat of quenching of the box-type coke oven is absorbed by the quenching box evaporator, the quenching box evaporator is configured to heat mixed water from the steam pocket to form a steam-water mixture containing saturated steam and saturated water, and a steam-water port of the quenching box evaporator is communicated with a steam-water port of the steam pocket, so that the steam-water mixture returns to the steam pocket; performing steam-water separation on the steam-water mixture to obtain saturated steam; the steam pipe network is communicated with a steam opening of the steam pocket so as to obtain saturated steam separated by the steam pocket. The desalted and deoxygenated saturated steam generated in the embodiment of the scheme can be conveniently applied to wider applications, so that the adaptability to regions and seasons is conveniently improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coke quenching treatment, in particular to a coke quenching waste heat recovery system for a box-type coke oven. Background Art

[0002] In the coke quenching process using the existing box-type coke oven, one way is to spray industrial water onto the red coke in the box-type coke oven to achieve the purpose of extinguishing the coke. The above method will cause a large amount of water resource waste, and a large amount of harmful substances such as soot and sulfides carried by the coke quenching water evaporate into the atmosphere, seriously polluting the atmosphere and the surrounding environment.

[0003] Another way is to recover the waste heat of coke quenching for heating supply to achieve the purpose of extinguishing the coke. Although this method is more environmentally friendly than the above method, due to the different demands for heating according to different regions and seasons, this method is easily restricted by regions and seasons. Summary of the Utility Model

[0004] The purpose of the embodiment of the utility model is to provide a coke quenching waste heat recovery system for a box-type coke oven to improve its adaptability to different regions and seasons. The specific technical solutions are as follows:

[0005] The embodiment of the present application provides a coke quenching waste heat recovery system for a box-type coke oven, including:

[0006] A demineralized water tank for storing demineralized water;

[0007] A deaerator communicated with the demineralized water tank, and the deaerator is configured to heat the demineralized water entering the deaerator to deaerate the demineralized water;

[0008] A steam drum, the water inlet of the steam drum is communicated with the deaerator to obtain the demineralized water deaerated by the deaerator and mix it with the saturated water in the steam drum;

[0009] A box-type coke oven including a coke quenching box evaporator, the water inlet of the coke quenching box evaporator is communicated with the water outlet of the steam drum, and is configured to heat the water mixed from the steam drum to form a steam-water mixture including saturated steam and saturated water. The steam-water port of the coke quenching box evaporator is communicated with the steam-water port of the steam drum, so that the steam-water mixture returns to the steam drum for steam-water separation to obtain saturated steam;

[0010] A steam pipe network communicated with the steam port of the steam drum to obtain the saturated steam separated by the steam drum.

[0011] In some embodiments of the present application, the steam pipe network includes a steam turbine generator set and a heating group, and both the steam turbine generator set and the heating group are communicated with the steam port of the steam drum.

[0012] In some embodiments of the present application, a first switching valve is provided between the steam turbine generator set and the steam outlet of the steam drum.

[0013] In some embodiments of the present application, a second switching valve is provided between the heat supply group and the steam outlet of the steam drum.

[0014] In some embodiments of the present application, it further includes:

[0015] A deaerating feed water pump is arranged between the water outlet of the demineralized water tank and the water inlet of the deaerator, and is configured to convey the demineralized water in the demineralized water tank to the deaerator.

[0016] In some embodiments of the present application, it further includes:

[0017] A steam drum feed water pump is arranged between the water outlet of the deaerator and the water inlet of the steam drum, and is configured to convey the demineralized water deaerated by the deaerator to the steam drum.

[0018] In some embodiments of the present application, it further includes:

[0019] A circulating pump is arranged between the water outlet of the steam drum and the water inlet of the coke quenching box evaporator, and forms a circulating water path among the steam drum, the circulating pump and the coke quenching box evaporator;

[0020] In some embodiments of the present application, the circulating pump is configured to circulate the water in the circulating water path.

[0021] In some embodiments of the present application, the box-type coke oven includes an inner box wall, an outer box wall and a heat insulation layer. The coke quenching box evaporator includes evaporation tubes, and the evaporation tubes are arranged between the inner box wall and the outer box wall, and the heat insulation layer is arranged between the evaporation tubes and the outer box wall;

[0022] Both ends of the evaporation tube are the water inlet and the water outlet of the coke quenching box evaporator.

[0023] In some embodiments of the present application, a flow regulating valve is provided at the water inlet of the demineralized water tank.

[0024] The coke quenching waste heat recovery system for a box-type coke oven provided by an embodiment of the present utility model includes: a demineralized water tank, a deaerator, a steam drum, a box-type coke oven, and a steam pipe network. The demineralized water tank is used for storing demineralized water; the deaerator is connected to the demineralized water tank, and the deaerator is configured to heat the demineralized water entering the deaerator to deaerate the demineralized water; the water inlet of the steam drum is connected to the deaerator to obtain the demineralized water deaerated by the deaerator and mix it with the saturated water in the steam drum; the box-type coke oven includes a coke quenching box evaporator, the water inlet of the coke quenching box evaporator is connected to the water outlet of the steam drum, the heat of coke quenching in the box-type coke oven is absorbed by the coke quenching box evaporator, and the coke quenching box evaporator is configured to heat the water mixed from the steam drum to form a steam-water mixture including saturated steam and saturated water. The steam-water port of the coke quenching box evaporator is connected to the steam-water port of the steam drum so that the steam-water mixture returns to the steam drum, and the steam-water mixture is subjected to steam-water separation to obtain saturated steam; the steam pipe network is connected to the steam port of the steam drum to obtain the saturated steam separated by the steam drum. Among them, the saturated steam is desalted and deaerated saturated steam. Compared with the heating water generated in the prior art, the desalted and deaerated saturated steam generated in the embodiments of this solution is convenient for application in a wider range of uses, thereby facilitating the improvement of the adaptability to regions and seasons.

[0025] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a coke quenching waste heat recovery system for a box-type coke oven provided by an embodiment of the present application;

[0028] Figure 2 It is a schematic structural diagram of a specific coke quenching waste heat recovery system for a box-type coke oven provided by an embodiment of the present application.

[0029] The reference numerals are as follows:

[0030] Demineralized water tank 10, deaerator 20, steam drum 30, coke quenching box evaporator 40, steam pipe network 50, steam turbine generator set 51, heating group 52, first on-off valve 53, second on-off valve 54, water tank feed pump 55, deaeration feed pump 60, steam drum feed pump 70, circulation pump 80. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the protection scope of the present utility model.

[0032] In this application, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically limited.

[0034] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Without conflict, the various embodiments in this application can be combined with each other.

[0035] In the technical solution where the waste heat recovered from conventional coke quenching is used for heating with warm air, it is usually only applicable to cold environments. For regions with warm seasons throughout the year and hot summers, it is difficult to make extensive use of the waste heat recovered from conventional coke quenching. In the embodiments of this solution, deaerated water is heat-exchanged with the heat of box-type coke oven quenching. While cooling the high-temperature coke, the deaerated water is heated. After the deaerated water is heated and turned into a steam-water mixture, it enters the steam drum to separate out saturated steam and send it to the factory area. Among them, the desalted and deaerated saturated steam is convenient for more extensive uses.

[0036] Figure 1 It is a structural schematic diagram of a box-type coke oven quenching waste heat recovery system provided for the embodiments of this application, as Figure 1As shown in the figure, the coke quenching waste heat recovery system for the box-type coke oven includes: a demineralized water tank 10, a deaerator 20, a steam drum 30, a box-type coke oven, and a steam pipe network 50.

[0037] The demineralized water tank 10 is used to store demineralized water; the deaerator 20 is connected to the demineralized water tank 10, and the deaerator 20 is configured to heat the demineralized water entering the deaerator 20 to remove oxygen from the demineralized water; the water inlet of the steam drum 30 is connected to the deaerator 20 to obtain the demineralized water deoxygenated by the deaerator 20 and mix it with the saturated water in the steam drum 30; the box-type coke oven includes a coke quenching box evaporator 40, the water inlet of the coke quenching box evaporator 40 is connected to the water outlet of the steam drum 30, and is configured to heat the mixed water from the steam drum 30 to form a steam-water mixture including saturated steam and saturated water, the steam-water port of the coke quenching box evaporator 40 is connected to the steam-water port of the steam drum 30, so that the steam-water mixture returns to the steam drum 30, and the steam-water mixture is subjected to steam-water separation to obtain saturated steam; the steam pipe network 50 is connected to the steam port of the steam drum 30 to obtain the saturated steam separated by the steam drum 30.

[0038] In some embodiments, a flow regulating valve is provided at the water inlet of the demineralized water tank 10. The demineralized water supplemented to the demineralized water tank 10 can be from the demineralized water pipe network of the plant area, and the demineralized water is sent to the demineralized water tank 10 through the flow regulating valve for storage.

[0039] An oxygen removal feed pump 60 can be provided between the water outlet of the demineralized water tank 10 and the water inlet of the deaerator 20, and is configured to transport the demineralized water in the demineralized water tank 10 to the deaerator 20. The demineralized water in the demineralized water tank 10 is pressurized by the oxygen removal feed pump 60 and sent to the deaerator 20 for oxygen removal. A steam drum feed pump 70 is provided between the water outlet of the deaerator 20 and the water inlet of the steam drum 30, and the steam drum feed pump 70 is configured to pressurize and transport the demineralized water deoxygenated by the deaerator 20 to the steam drum 30.

[0040] A circulation pump 80 is provided between the water outlet of the steam drum 30 and the water inlet of the coke quenching box evaporator 40 to form a circulating water path among the steam drum 30, the circulation pump 80, and the coke quenching box evaporator 40;

[0041] The deoxygenated water entering the steam drum 30 is mixed with the saturated water in the steam drum 30, and after mixing, it is pressurized by the circulation pump 80 and sent to the box-type coke oven for heat exchange. The saturated water in the coke quenching box evaporator 40 absorbs heat and forms a steam-water mixture, and the circulation pump 80 circulates the water in the circulating water path. The steam-water mixture returns to the steam drum 30 under the action of the external power of the circulation pump 80 and the density difference of the steam-water system itself. After passing through the steam-water separation device built in the steam drum 30, the separated saturated steam is incorporated into the steam pipe network 50, and the remaining water continues to be mixed with the makeup water from the deaerator 20 for steam-water circulation.

[0042] The coke quenching waste heat recovery system for the box-type coke oven provided by the embodiment of the present utility model includes: a demineralized water tank 10, a deaerator 20, a steam drum 30, a box-type coke oven, and a steam pipe network 50. The demineralized water tank 10 is used to store demineralized water; the deaerator 20 is connected to the demineralized water tank 10, and the deaerator 20 is configured to heat the demineralized water entering the deaerator 20 to deaerate the demineralized water; the water inlet of the steam drum 30 is connected to the deaerator 20 to obtain the demineralized water deaerated by the deaerator 20 and mix it with the saturated water in the steam drum 30; the box-type coke oven includes a coke quenching box evaporator 40, the water inlet of the coke quenching box evaporator 40 is connected to the water outlet of the steam drum 30, the heat of coke quenching of the box-type coke oven is absorbed by the coke quenching box evaporator 40, and the coke quenching box evaporator 40 is configured to heat the water mixed from the steam drum 30 to form a steam-water mixture including saturated steam and saturated water. The steam-water port of the coke quenching box evaporator 40 is connected to the steam-water port of the steam drum 30 to return the steam-water mixture to the steam drum 30 for steam-water separation of the steam-water mixture to obtain saturated steam; the steam pipe network 50 is connected to the steam port of the steam drum 30 to obtain the saturated steam separated by the steam drum 30. Among them, the saturated steam is demineralized and deaerated saturated steam. Compared with the heating water generated by the prior art, the demineralized and deaerated saturated steam generated in the embodiments of this solution is convenient for application in a wider range of uses, thereby facilitating the improvement of the adaptability to regions and seasons.

[0043] In some embodiments, the box-type coke oven includes an inner box wall, an outer box wall, and a heat insulation layer. The coke quenching box evaporator 40 includes evaporation tubes. The evaporation tubes are arranged between the inner box wall and the outer box wall, and the heat insulation layer is arranged between the evaporation tubes and the outer box wall; the two ends of the evaporation tubes are the water inlet and the water outlet of the coke quenching box evaporator 40. The heat insulation layer is beneficial to reducing the heat exchange inside the inner box wall and outside the outer box wall, thereby being beneficial to improving the heat recovery rate of the coke quenching box evaporator 40 during the coke quenching process of the box-type coke oven.

[0044] In a specific implementation, the evaporation pipes are arranged at the top and the side of the box-type coke oven. The evaporation pipes at the top of the box-type coke oven are connected to those at the side of the box-type coke oven. The water inlet of the quenching box evaporator 40 is arranged at the side of the box-type coke oven, and the water outlet of the quenching box evaporator 40 is arranged at the top of the box-type coke oven. Since the water inlet of the quenching box evaporator 40 is arranged at the side of the box-type coke oven and the water outlet of the quenching box evaporator 40 is arranged at the top of the box-type coke oven, the water flowing out from the water outlet of the steam drum 30 first enters the side area of the box-type coke oven to absorb heat for quenching, and then under the action of water pressure, it enters the top area of the box-type coke oven to absorb heat for quenching. Finally, the evaporation pipes of the evaporator heat the water mixed from the steam drum 30 to form a steam-water mixture including saturated steam and saturated water, which flows out from the water outlet of the quenching box evaporator 40.

[0045] Figure 2 The figure is a schematic structural diagram of a specific box-type coke oven quenching waste heat recovery system provided by an embodiment of the present application. As Figure 2 shown, for example, when the location of the box-type coke oven quenching waste heat recovery system is in a region with warm climate all year round and there is no demand for heating, the steam pipe network 50 includes a steam turbine generator set 51. The steam turbine generator set 51 is connected to the steam outlet of the steam drum 30, and the saturated steam generated by the box-type coke oven quenching waste heat recovery system can be used to generate electricity through the steam turbine generator set 51.

[0046] For another example, when the location of the box-type coke oven quenching waste heat recovery system includes warm seasons and cold seasons, the steam pipe network 50 includes: a steam turbine generator set 51 and a heating group 52. Both the steam turbine generator set 51 and the heating group 52 are connected to the steam outlet of the steam drum 30. In warm seasons, there is no demand for heating, and the saturated steam generated by the box-type coke oven quenching waste heat recovery system can be used to generate electricity through the steam turbine generator set 51. In cold seasons, the saturated steam generated by the box-type coke oven quenching waste heat recovery system can be used for heating through the heating group 52. After the heating water is recycled, only natural losses need to be considered, and the circulating system can be replenished regularly. In addition, if there is excess saturated steam, the saturated steam generated by the box-type coke oven quenching waste heat recovery system can be used to generate electricity through the steam turbine generator set 51.

[0047] The steam turbine generator set 51 includes a steam turbine and a generator. The steam turbine is configured to convert the thermal energy of the saturated steam into mechanical energy. The steam turbine is connected to the generator, and the generator is configured to convert the mechanical energy of the steam turbine into electrical energy.

[0048] In some embodiments, the steam turbine includes a rotating shaft and blades. The steam generated by the coke quenching box evaporator 40 enters the steam turbine and expands to do work, causing the blades to rotate, thereby driving the rotation of the rotating shaft and converting the thermal energy of the steam into mechanical energy. The generator includes a motor shaft, and the motor shaft is in transmission connection with the rotating shaft. The rotation of the rotating shaft drives the rotation of the motor shaft, so that the generator converts the mechanical energy of the steam turbine into electrical energy for power generation.

[0049] The scaling condition of the blades of the steam turbine can be improved by using demineralized water. The demineralized water enters the deaerator 20 from the demineralized water tank 10, and the deaerator 20 can deaerate the demineralized water by heating, thereby reducing the corrosion of the steam turbine blades caused by the gasification and evaporation of the demineralized water.

[0050] In some embodiments, a first switch valve 53 is provided between the steam port of the steam turbine generator set 51 and the steam drum 30. The saturated steam generated by the box-type coke oven coke quenching waste heat recovery system can be used for power generation by the steam turbine generator set 51 by opening the first switch valve 53.

[0051] In some embodiments, a second switch valve 54 is provided between the steam port of the heat supply group 52 and the steam drum 30. The saturated steam generated by the box-type coke oven coke quenching waste heat recovery system can be used for heating by the heat supply group 52 by opening the second switch valve 54. Among them, the first switch valve 53 and the second switch valve 54 can be electric valves, etc.

[0052] To facilitate the recycling of the power generation water of the steam turbine generator set 51, the water outlet of the steam turbine generator set 51 is communicated with the demineralized water tank 10. To facilitate the recycling of the water used by the heat supply group 52, the water outlet of the heat supply group 52 is communicated with the demineralized water tank 10.

[0053] In some embodiments, the box-type coke oven coke quenching waste heat recovery system further includes a water tank feed pump 55. The water inlet of the water tank feed pump 55 is respectively connected to the water outlets of the steam turbine generator set 51 and the heat supply group 52, and the water outlet of the water tank feed pump 55 is connected to the water inlet of the demineralized water tank 10.

[0054] The box-type coke oven coke quenching waste heat recovery system provided by the embodiments of the present application has at least the following advantages:

[0055] 1. The heat recovery and utilization during the coke quenching process are realized, thereby reducing the waste of coke quenching heat.

[0056] 2. During the coke quenching process, the environmental pollution to the atmosphere and the surrounding area is reduced.

[0057] 3. The box-type coke oven coke quenching waste heat recovery system of the present application recovers the coke quenching waste heat to generate desalted and deaerated saturated steam, which is convenient for more extensive applications, thereby facilitating the improvement of the adaptability to regions and seasons.

[0058] Each embodiment of the present application is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and the differences between each embodiment and other embodiments are emphasized.

[0059] The above are only the preferred embodiments of the present application and are not intended to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A box-type coke oven quenching waste heat recovery system, characterized in that: include: A desalted water tank (10), used for storing desalted water; a deaerator (20) connected to the desalted water tank (10), wherein the deaerator (20) is configured to heat the desalted water entering the deaerator (20) to deoxygenate the desalted water; A steam drum (30), wherein a water inlet of the steam drum (30) is connected to the deaerator (20) so as to obtain deionized water after deoxygenation in the deaerator (20) and mix the deionized water with the saturated water in the steam drum (30); A box-type coke oven comprises a quenching box evaporator (40), wherein a water inlet of the quenching box evaporator (40) is connected to a water outlet of the steam drum (30), and the evaporator is configured to heat mixed water from the steam drum (30) to form a steam-water mixture comprising saturated steam and saturated water, wherein a steam-water outlet of the quenching box evaporator (40) is connected to a steam-water outlet of the steam drum (30) to allow the steam-water mixture to return to the steam drum (30), and steam-water separation is performed on the steam-water mixture to obtain saturated steam; The steam pipe network (50) is connected to the steam port of the steam drum (30) to obtain the saturated steam separated by the steam drum (30).

2. The box-type coke oven quenching waste heat recovery system according to claim 1 is characterized in that: The steam pipe network (50) comprises: a steam turbine generator set (51) and a heating group (52); the steam turbine generator set (51) and the heating group (52) are both connected to the steam outlet of the steam drum (30).

3. The box-type coke oven quenching waste heat recovery system according to claim 2 is characterized in that: A first switch valve (53) is provided between the steam turbine generator set (51) and the steam outlet of the steam drum (30).

4. The box-type coke oven quenching waste heat recovery system according to claim 3 is characterized in that: A second on-off valve (54) is provided between the heating group (52) and the steam outlet of the steam drum (30).

5. The box-type coke oven quenching waste heat recovery system according to claim 1, characterized in that: Also includes: The deoxygenated water supply pump (60) is disposed between the water outlet of the desalted water tank (10) and the water inlet of the deaerator (20), and is configured to transport the desalted water in the desalted water tank (10) to the deaerator (20).

6. The box-type coke oven quenching waste heat recovery system according to claim 1, characterized in that: Also includes: A drum feed water pump (70) is disposed between a water outlet of the deaerator (20) and a water inlet of the drum (30), and is configured to transport deionized water after deoxygenation in the deaerator (20) to the drum (30).

7. The box-type coke oven quenching waste heat recovery system according to claim 1, characterized in that: Also includes: A circulating pump (80) is arranged between the water outlet of the steam drum (30) and the water inlet of the quenching box evaporator (40), and a circulating water circuit is formed among the steam drum (30), the circulating pump (80) and the quenching box evaporator (40).

8. The box-type coke oven quenching waste heat recovery system according to claim 7, characterized in that: The circulation pump (80) is configured to circulate water in the circulation water circuit.

9. The box-type coke oven quenching waste heat recovery system according to any one of claims 1 to 8, characterized in that: The box-type coke oven comprises an inner wall of the box, an outer wall of the box and a heat-insulating layer, the coke quenching box evaporator (40) comprises an evaporating pipe, the evaporating pipe is arranged between the inner wall of the box and the outer wall of the box, and the heat-insulating layer is arranged between the evaporating pipe and the outer wall of the box; The two ends of the evaporation pipe are a water inlet of the quenching box evaporator (40) and a water outlet of the quenching box evaporator (40).

10. The box-type coke oven quenching waste heat recovery system according to any one of claims 1 to 8, characterized in that: The water inlet of the desalted water tank (10) is provided with a flow regulating valve.

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