Dry quenching power generation system and dry quenching equipment

Abstract

The embodiment of the utility model provides a dry quenching power generation system and dry quenching equipment. The dry quenching power generation system comprises a dry quenching boiler, a steam turbine, a main steam pipeline, a low-temperature reheat steam pipeline, a high-temperature reheat steam pipeline, a steam exhaust pipeline, a water supply pipeline, a high-pressure bypass device, a low-pressure bypass device, a second desuperheating water pipeline, a first desuperheating water pipeline, a condensate pump and a boiler water supply pump. A high-pressure bypass pipeline of the high-pressure bypass device is communicated with the main steam pipeline and the low-temperature reheat steam pipeline; a low-pressure bypass pipeline of the low-pressure bypass device is communicated with the high-temperature reheat steam pipeline and the steam exhaust pipeline; a water inlet of the first desuperheating water pipeline is communicated with the boiler feed pump, and a water outlet is communicated with the high-pressure bypass pipeline; desuperheating water in the first desuperheating water pipeline is used for cooling steam in the high-pressure bypass pipeline; a water inlet of the second desuperheating water pipeline is communicated with the condensate pump, and a water outlet is communicated with the low-pressure bypass pipeline; and desuperheating water in the second desuperheating water pipeline is used for cooling steam in the low-pressure bypass pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of coking waste heat utilization, and in particular to a dry quenching coke power generation system and dry quenching coke equipment. Background Art

[0002] CDQ is an important technology for recycling the sensible heat of coke. Due to the huge economic, environmental and social benefits of CDQ power generation, it has become an important research topic for enterprises.

[0003] In recent years, under the requirements of corporate benefits and national energy conservation and emission reduction policies, high-parameter miniaturized steam turbine technology has developed rapidly, and dry quenching power generation systems using intermediate single reheating have been increasingly used.

[0004] In the prior art, the water supply process of the high and low pressure bypass devices in the intermediate primary reheat system consumes a large amount of energy. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a dry quenching coke power generation system and dry quenching coke equipment to reduce the energy consumption of the power generation system. The specific technical solution is as follows:

[0006] An embodiment of the first aspect of the present application provides a dry coke quenching power generation system, comprising:

[0007] The dry quenching boiler comprises a steam drum, a superheater and a reheater; the superheater is connected to the steam drum and is used to heat the steam generated by the steam drum;

[0008] The steam turbine comprises a high-pressure cylinder and a low-pressure cylinder; the reheater is used to heat the steam output from the high-pressure cylinder;

[0009] a main steam pipe, one end of which is connected to the superheater and the other end of which is connected to the steam inlet of the high-pressure cylinder;

[0010] a low-temperature reheat steam pipe, one end of which is connected to the steam outlet of the high-pressure cylinder and the other end of which is connected to the reheater;

[0011] a high-temperature reheat steam pipe, one end of which is connected to the reheater and the other end of which is connected to the steam inlet of the low-pressure cylinder;

[0012] An exhaust pipe and a water supply pipe, as well as a condenser, a condensate pump, and a boiler feed water pump provided on the water supply pipe, wherein one end of the exhaust pipe is connected to the steam outlet of the low-pressure cylinder and the other end is connected to the inlet of the condenser; one end of the water supply pipe is connected to the outlet of the condenser and the other end is connected to the water inlet of the dry quenching boiler;

[0013] a high-pressure bypass device, comprising a high-pressure bypass pipe, wherein the high-pressure bypass pipe is connected to the main steam pipe and the low-temperature reheat steam pipe;

[0014] A low-pressure bypass device; comprising a low-pressure bypass pipe, wherein the low-pressure bypass pipe is connected to the high-temperature reheat steam pipe and the exhaust pipe;

[0015] a first desuperheating water pipe, the water inlet of which is connected to the boiler feed water pump, and the water outlet of which is connected to the high-pressure bypass pipe; the desuperheating water in the first desuperheating water pipe is used to cool the steam in the high-pressure bypass pipe;

[0016] The second cooling water pipe has a water inlet connected to the condensate pump and a water outlet connected to the low-pressure bypass pipe; the cooling water in the second cooling water pipe is used to cool the steam in the low-pressure bypass pipe.

[0017] In some embodiments, the high-pressure bypass device further includes a first control valve disposed on the high-pressure bypass pipeline; the low-pressure bypass device further includes a second control valve disposed on the low-pressure bypass pipeline.

[0018] In some embodiments, the CDQ power generation system further includes a desalted water tank, a deoxygenated water pump, a feed water preheater, and a deaerator sequentially arranged on the water feed pipe, the water inlet of the desalted water tank being connected to the water outlet of the condensate pump, and the water outlet of the deaerator being connected to the water inlet of the boiler feed water pump.

[0019] In some embodiments, the CDQ power generation system further includes a regulating valve, the water supply pipeline includes a condensate pipeline, and the regulating valve is provided on the condensate pipeline for controlling pressure loss to balance the pressure in the power generation system.

[0020] In some embodiments, the water inlet of the second desuperheating water pipe is connected to the condensate water pipe, and the water inlet of the second desuperheating water pipe is arranged between the regulating valve and the water outlet of the condensate pump.

[0021] In some embodiments, the low-pressure bypass device further includes a temperature reduction and pressure reduction device, and the temperature reduction and pressure reduction device is provided on the low-pressure bypass pipeline.

[0022] In some embodiments, the CDQ power generation system further includes a generator connected to the high-pressure cylinder and the low-pressure cylinder.

[0023] In some embodiments, the dry quenching boiler further comprises an economizer, wherein a water inlet of the economizer is connected to an end of the water supply pipe away from the low-pressure cylinder;

[0024] The CDQ power generation system further includes a water inlet pipe, one end of which is connected to the water outlet of the economizer, and the other end of which is connected to the water inlet of the steam drum.

[0025] In some embodiments, the boiler further comprises an evaporator, and the evaporator is placed in the CDQ boiler;

[0026] The dry quenching coke power generation system further includes:

[0027] a water outlet pipe, the water outlet pipe being connected to the water outlet of the steam drum and the water inlet of the evaporator;

[0028] A steam outlet pipe is connected to the steam outlet of the evaporator and the steam inlet of the steam drum.

[0029] An embodiment of the second aspect of the present application provides a coke dry quenching device, including the above-mentioned coke dry quenching power generation system.

[0030] In the embodiment of the present application, steam in the drum enters a superheater. The superheater heats the steam to a preset temperature and then delivers it to the high-pressure cylinder of the steam turbine via a main steam pipe. As the steam partially expands and produces work in the high-pressure cylinder, its temperature gradually decreases. The reduced steam is then output from the high-pressure cylinder steam outlet and delivered via a low-temperature reheat steam pipe to a reheater, where the reheater reheats the reduced steam. Once the steam is reheated to a preset temperature, it is delivered via a high-temperature reheat steam pipe to the low-pressure cylinder of the steam turbine for expansion and work. After this work is complete, the remaining steam returns to the dry coke quenching boiler via an exhaust pipe. After the steam expands and produces work in the high-pressure cylinder, the reduced steam can be further heated via the reheater and then delivered to the low-pressure cylinder to continue producing work and generate electricity. This improves the steam utilization rate in the dry coke quenching boiler, thereby improving the utilization rate of the sensible heat of the coke and the power generation efficiency of the dry coke quenching power generation system. The dry coke quenching power generation system also includes a high-pressure bypass pipe connecting the main steam pipe and the low-temperature reheat steam pipe. The high-pressure bypass device can also reduce the pressure of the main steam line when the pressure there is too high, diverting steam from the main steam line to the high-pressure bypass line. This reduces the risk of damage to the main steam line due to excessive pressure and enhances the safety of the CDQ power generation system. The low-pressure bypass device can reduce the temperature and pressure of steam in the high-temperature reheat steam line, producing low-temperature, low-pressure steam, which is then delivered to the exhaust line. When the steam turbine in the CDQ power generation system is not running, steam from the high-temperature reheat steam line can be diverted directly to the exhaust line via the low-pressure bypass line, and then to the CDQ boiler, bypassing the low-pressure cylinder of the turbine. When the CDQ power generation system is operating, the low-pressure bypass device can reduce the pressure of the high-temperature reheat steam line when the pressure there is too high, diverting steam from the high-temperature reheat steam line to the low-pressure bypass line, enhancing the safety of the CDQ power generation system.

[0031] The difference in pressure between the high-pressure bypass device and the low-pressure bypass device enables the boiler feed water pump to provide power for the cooling water in the first cooling water pipe, and the condensate pump to provide power for the cooling water in the second cooling water pipe, thereby better reducing the energy consumption of the power generation system.

[0032] Of course, any product implementing the present application does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Schematic diagram of the dry quenching power generation system provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] CDQ boiler 10; steam drum 11; superheater 12; low-temperature superheater 121; high-temperature superheater 122; reheater 13; low-temperature reheater 131; high-temperature reheater 132; economizer 14; evaporator 15; steam turbine 20; high-pressure cylinder 21; low-pressure cylinder 22; main steam pipe 31; low-temperature reheat steam pipe 32; high-temperature reheat steam pipe 33; exhaust pipe 34a; feed water pipe 34b; condensate pipe 341; regulating valve 342; first desuperheater Water pipe 35; second cooling water pipe 36; water inlet pipe 37; water outlet pipe 38; steam outlet pipe 39; high-pressure bypass device 41; high-pressure bypass pipe 411; first control valve 412; low-pressure bypass device 42; low-pressure bypass pipe 421; second control valve 422; cooling and pressure reduction device 43; condenser 51; condensate pump 52; boiler feed water pump 61; desalted water tank 62; deaerator water pump 63; feed water preheater 64; deaerator 65; generator 70. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0038] In order to reduce energy consumption, Figure 1As shown, an embodiment of the first aspect of the present application provides a dry quenching power generation system, which includes: a dry quenching boiler 10, a steam turbine 20, a main steam pipe 31, a low-temperature reheat steam pipe 32, a high-temperature reheat steam pipe 33, an exhaust pipe 34a and a feed water pipe 34b, and a condenser 51, a condensate pump 52, a boiler feed water pump 61, a high-pressure bypass device 41, a low-pressure bypass device 42, a first desuperheating water pipe 35, and a second desuperheating water pipe 36 provided on the feed water pipe 34b;

[0039] The dry coke quenching boiler 10 includes a steam drum 11, a superheater 12, and a reheater 13; the superheater 12 is connected to the steam drum 11 and is used to heat the steam generated by the steam drum 11; the steam turbine 20 includes a high-pressure cylinder 21 and a low-pressure cylinder 22; the reheater 13 is used to heat the steam output by the high-pressure cylinder 21; one end of the main steam pipe 31 is connected to the superheater 12, and the other end is connected to the steam inlet of the high-pressure cylinder 21; one end of the low-temperature reheat steam pipe 32 is connected to the steam outlet of the high-pressure cylinder 21, and the other end is connected to the reheater 13; one end of the high-temperature reheat steam pipe 33 is connected to the reheater 13, and the other end is connected to the steam inlet of the low-pressure cylinder 22; an exhaust pipe 34a and a feed water pipe 34b, as well as a condenser 51, a condensate pump 52, and a boiler feed water pump 61 provided on the feed water pipe 34b, one end of the exhaust pipe 34a is connected to the steam outlet of the low-pressure cylinder 22, and the other end is connected to the inlet of the condenser 51 one end of the feed water pipe 34b is connected to the outlet of the condenser 51, and the other end is connected to the water inlet of the dry quenching boiler 10; the high-pressure bypass device 41 includes a high-pressure bypass pipe 411, which is connected to the main steam pipe 31 and the low-temperature reheat steam pipe 32; the low-pressure bypass device 42 includes a low-pressure bypass pipe 421, which is connected to the high-temperature reheat steam pipe 33 and the exhaust pipe 34a; the first desuperheating water pipe 35, the water inlet of which is connected to the boiler feed water pump 61, and the water outlet of which is connected to the high-pressure bypass pipe 411; the desuperheating water in the first desuperheating water pipe 35 is used to cool the steam in the high-pressure bypass pipe 411; the second desuperheating water pipe 36, the water inlet of which is connected to the condensate pump 52, and the water outlet of which is connected to the low-pressure bypass pipe 421; the desuperheating water in the second desuperheating water pipe 36 is used to cool the steam in the low-pressure bypass pipe 421.

[0040] In the embodiment of the present application, steam in the drum 11 enters the superheater 12. The superheater 12 heats the steam to a preset temperature and then delivers it to the high-pressure cylinder 21 of the steam turbine 20 via the main steam pipe 31. As the steam partially expands and produces work in the high-pressure cylinder 21, its temperature gradually decreases. The reduced steam is then output from the steam outlet of the high-pressure cylinder 21 and enters the reheater 13 via the low-temperature reheat steam pipe 32, allowing the reheater 13 to reheat the cooled steam. Once the steam is reheated to a preset temperature, it is delivered to the low-pressure cylinder 22 of the steam turbine 20 via the high-temperature reheat steam pipe 33 for expansion and work. After the work is complete, the remaining steam returns to the CDQ boiler 10 via the exhaust pipe 34a and the feedwater pipe 34b. After the steam expands and performs work in the high-pressure cylinder 21, the reduced-temperature steam can be further heated via the reheater 13 and then enter the low-pressure cylinder 22 to continue performing work and generating electricity. This improves the utilization rate of the steam in the CDQ boiler 10, thereby improving the utilization rate of the sensible heat of the coke and the power generation efficiency of the CDQ power generation system. The CDQ power generation system also includes a high-pressure bypass pipe 411 connecting the main steam pipe 31 and the low-temperature reheat steam pipe 32. During the initial startup of the CDQ power generation system, the reheater 13 may be started before the steam turbine 20. In this case, the steam in the main steam pipe 31 can bypass the high-pressure cylinder 21 of the steam turbine 20 and instead pass through the high-pressure bypass pipe 411 to reduce the temperature and pressure of the main steam to form low-temperature reheat steam, which then enters the low-temperature reheat steam pipe 32 and then the reheater 13. This reduces the probability of dry burning of the reheater 13 and damage to the reheater 13. During the operation of the CDQ power generation system, the high-pressure bypass device 41 can also divide the pressure of the main steam line 31 when the pressure in the main steam line 31 is too high, diverting the steam in the main steam line 31 to the high-pressure bypass line 411. This reduces the probability of damage to the main steam line 31 due to excessive pressure in the main steam line 31 and increases the safety of the CDQ power generation system. The low-pressure bypass device 42 can reduce the temperature and pressure of the steam in the high-temperature reheat steam line 33, forming low-temperature, low-pressure steam, which is then delivered to the exhaust line 34a. When the steam turbine 20 in the CDQ power generation system is not started, the steam in the high-temperature reheat steam line 33 can enter the exhaust line 34a directly via the low-pressure bypass line 421, and then enter the CDQ boiler 10, without passing through the low-pressure cylinder 22 of the steam turbine 20. When the CDQ power generation system is operating, the low-pressure bypass device 42 can separate the pressure of the high-temperature reheat steam pipe 33 when the air pressure in the high-temperature reheat steam pipe 33 is too high, and divert the steam in the high-temperature reheat steam pipe 33 to the low-pressure bypass pipe 421, thereby increasing the safety of the CDQ power generation system.

[0041] Part of the water pumped by the boiler feedwater pump 61 is supplied to the CDQ boiler 10, and the remaining part is supplied to the first attemperating water pipeline 35. The attemperating water in the first attemperating water pipeline 35 cools the steam in the high-pressure bypass device 41, preventing damage to the reheater 13 when the high-temperature steam enters. Part of the water pumped by the condensate pump 52 is supplied to the desalted water tank 62, and the remaining part is supplied to the second attemperating water pipeline 36. Because the water pumped by the condensate pump 52 is relatively low in temperature, the attemperating water in the second attemperating water pipeline 36 cools the steam in the low-pressure bypass device 42, preventing damage to the condenser 51 due to the high-temperature steam. The provision of the first attemperating water pipeline 35 and the second attemperating water pipeline 36 fully utilizes the boiler feedwater pump 61 and the condensate pump 52 in the existing power generation system, eliminating the need for adding new pumping equipment.

[0042] In the existing technology, the cooling water for the high-pressure bypass device and the low-pressure bypass device are both provided by the intermediate tap of the boiler feed water pump, which will lead to changes in the selection of the boiler feed water pump. In addition, since the cooling water for the low-pressure bypass device does not require the same pressure as that for the high-pressure bypass device, energy consumption is greatly increased.

[0043] In the embodiment of the present application, a CDQ power generation system with intermediate single reheating is adopted. According to the different pressures in the high-pressure bypass device 41 and the low-pressure bypass device 42, the intermediate tap of the boiler feed water pump 61 in the power generation system is used to provide cooling water to the first cooling water pipe 35, and the condensate pump 52 provides power for the cooling water in the second cooling water pipe 36. The boiler feed water pump 61 and the condensate pump 52 with different lifts in the power generation system are used to provide cooling water to the first cooling water pipe 35 and the second cooling water pipe 36, respectively, which can better reduce the energy consumption of the power generation system. In addition, when the condensate pump 52 provides cooling water to the second cooling water pipe 36, since the boiler feed water pump 61 does not need to supply water to the second cooling water pipe 36, but only needs to supply water to the first cooling water pipe 35, the water supply of the boiler feed water pump 61 is reduced, and therefore the selection of the boiler feed water pump 61 will also be affected accordingly. For example, when the first cooling water pipe 35 requires 40 m³ / h of cooling water and the second cooling water pipe 36 requires 10 m³ / h of cooling water, when both the first cooling water pipe 35 and the second cooling water pipe 36 need to be supplied with water through the boiler feed water pump 61, the boiler feed water pump 61 needs to supply 50 m³ / h; after the improvement of this application, cooling water is provided to the second cooling water pipe 36 through the condensate pump 52, that is, 10 m³ / h of cooling water is provided to the second cooling water pipe 36 through the condensate pump 52, then the boiler feed water pump 61 only needs 40 m³ / h, thereby reducing the energy consumption of the entire system.

[0044] In actual application, the condensate pump head can be increased from the conventional 0.3MPa to 1.2 to 1.6MPa.

[0045] Among them, the CDQ boiler 10 can be a high-temperature and high-pressure parameter boiler, a high-temperature and ultra-high-pressure parameter boiler, an ultra-high-temperature and ultra-high-pressure parameter boiler, or a higher parameter boiler. The steam turbine 20 can be a high-temperature and high-pressure parameter steam turbine, a high-temperature and ultra-high-pressure parameter steam turbine, an ultra-high-temperature and ultra-high-pressure parameter steam turbine, or a higher parameter steam turbine. The types and specifications of the CDQ boiler 10 and the steam turbine 20 can be set according to actual needs, and this application does not limit this. The steam turbine 20 is used to expand and perform work on the steam that meets the preset temperature requirements entering its interior, converting thermal energy into mechanical energy and generating electricity through a power generation device such as a generator 70. The high-pressure cylinder 21 and the low-pressure cylinder 22 of the steam turbine 20 may or may not be provided with a steam extraction port, and this application does not limit this.

[0046] CDQ boilers 10 include single-pressure, dual-pressure, natural circulation, forced circulation, and combined circulation boilers. The type of CDQ boiler 10 can be customized based on actual needs and is not limited in this application. The high-pressure bypass device 41 is used to cool and reduce the steam in the main steam line 31, generating lower-temperature steam that is transported to the low-temperature reheat steam line 32.

[0047] In some embodiments of the present application, Figure 1 As shown, the high-pressure bypass device 41 further includes a first control valve 412 provided on the high-pressure bypass pipeline 411 ; the low-pressure bypass device 42 further includes a second control valve 422 provided on the low-pressure bypass pipeline 421 .

[0048] In the embodiment of the present application, the first control valve 412 is used to control the opening, closing, opening duration, or closing duration of the high-pressure bypass pipe 411, and the second control valve 422 is used to control the opening, closing, opening duration, or closing duration of the low-pressure bypass pipe 421. The CDQ power generation system provided in the embodiment of the present application may include a pre-treatment mode, an operating mode, a pressure-dividing mode, and the like. In the pre-treatment mode, at the initial stage of the CDQ power generation system startup, the reheater 13 may start before the steam turbine 20. At this time, the first control valve 412 is opened to open the high-pressure bypass pipe 411. The steam in the main steam pipe 31 can enter the low-temperature reheat steam pipe 32 through the opened high-pressure bypass pipe 411, and then enter the reheater 13 without passing through the high-pressure cylinder 21. This reduces the probability of dry burning of the reheater 13 and causing damage to the reheater 13, thereby improving the safety of the CDQ power generation system.

[0049] When the CDQ power generation system is in operating mode, the first control valve 412 is closed, closing the high-pressure bypass line 411. Steam from the superheater 12 enters the high-pressure cylinder 21 through the main steam line 31, partially expanding and producing work. The steam, having cooled after this work, enters the low-temperature reheat steam line 32 from the steam outlet of the high-pressure cylinder 21 and is then delivered to the reheater 13, bypassing the high-pressure bypass line 411. The second control valve 422 closes the low-pressure bypass line 421. Steam reheated in the reheater 13 enters the low-pressure cylinder 22 through the high-temperature reheat steam line 33, expanding and producing work. The steam, having completed this work, is then discharged from the steam outlet of the low-pressure cylinder 22 and enters the exhaust line 34a, bypassing the low-pressure bypass line 421. This improves the steam utilization rate in the CDQ boiler 10, thereby increasing the utilization rate of the sensible heat of the coke and improving the power generation efficiency of the CDQ power generation system.

[0050] When the CDQ power generation system is in the pressure-dividing mode, the air temperature and air pressure in the main steam pipe 31 are relatively high, and the first control valve 412 is controlled to open, thereby opening the high-pressure bypass pipe 411. The steam in the main steam pipe 31 can continue to enter the high-pressure cylinder 21 through the main steam pipe 31, and can also enter the low-temperature reheat steam pipe 32 through the high-pressure bypass pipe 411, thereby reducing the temperature and pressure of the main steam pipe 31, reducing the probability of damage to the main steam pipe 31 due to excessively high air temperature or air pressure, and improving the safety of the CDQ power generation system. Correspondingly, when the temperature and pressure in the high-temperature reheat steam pipe 33 are too high, the second control valve 422 is controlled to open, thereby opening the low-pressure bypass pipe 421. The steam in the high-temperature reheat steam pipe 33 can continue to enter the low-pressure cylinder 22 through the high-temperature reheat steam pipe 33, or can enter the exhaust pipe 34a through the low-pressure bypass pipe 421, thereby reducing the temperature and pressure of the high-temperature reheat steam pipe 33, reducing the probability of damage to the high-temperature reheat steam pipe 33 due to excessive temperature or pressure, and improving the safety of the CDQ power generation system. The first control valve 412 and the second control valve 422 can be control valves such as electric valves or manual valves, and can be set according to actual needs. This application does not limit this.

[0051] Specifically, such as Figure 1 As shown, the CDQ power generation system may include a low-temperature reheater 131 and a high-temperature reheater 132. The low-temperature reheater 131 and the high-temperature reheater 132 are connected, with one side of the low-temperature reheater 131 connected to one side of the high-temperature reheater 132. The other side of the low-temperature reheater 131 is connected to the low-temperature reheat steam pipeline 32, and the other side of the high-temperature reheater 132 is connected to the high-temperature reheat steam pipeline 33. The provision of two reheaters 13 can better heat the steam entering the reheaters 13, allowing the steam to be heated to a preset temperature more quickly, thereby improving the utilization rate of the sensible heat of the coke.

[0052] Correspondingly, such as Figure 1As shown, the CDQ power generation system may further include two superheaters 12, which may be divided into a low-temperature superheater 121 and a high-temperature superheater 122. One side of the low-temperature superheater 121 is connected to one side of the high-temperature superheater 122, the other side of the low-temperature superheater 121 is connected to the steam drum 11, and the other side of the high-temperature superheater 122 is connected to the main steam pipe 31. The provision of two superheaters 12 can better heat the steam entering the superheater 12, so that the steam can be heated to a preset temperature more quickly, thereby improving the utilization rate of the sensible heat of the coke.

[0053] Furthermore, the low-temperature reheater 131 also includes a header and an emergency water spray desuperheater. The header can be the inlet header of the low-temperature reheater 131. The emergency water spray desuperheater can be installed on the header inlet pipe. The emergency water spray desuperheater is used to protect the reheater 13 when the dry coke quenching power generation system is in an emergency state, reducing the probability of damage to the reheater 13 and improving the safety of the dry coke quenching power generation system. Furthermore, the superheater 12 also includes a superheater water spray desuperheater. The superheater water spray desuperheater is installed between the low-temperature superheater 121 and the high-temperature superheater 122. It is used to adjust the temperature of the steam flowing out of the low-temperature superheater 121, reducing the probability of damage to the superheater 12 due to excessive temperature in the low-temperature superheater 121. The above-mentioned water spray desuperheater can be a hybrid desuperheater or a surface desuperheater, which is not limited in this application.

[0054] In some embodiments of the present application, Figure 1 As shown, the CDQ power generation system further includes a desalted water tank 62, a deaerator pump 63, a feedwater preheater 64, and a deaerator 65, which are sequentially arranged on the feedwater pipe 34b. The water inlet of the desalted water tank 62 is connected to the water outlet of the condensate pump 52, and the water outlet of the deaerator 65 is connected to the water inlet of the boiler feedwater pump 61. The CDQ boiler 10 includes an economizer 14 and an evaporator 15.

[0055] In this embodiment, steam entering the condenser 51 is cooled to condensate before entering a hot well (not shown). The condensate is then pressurized by the condensate pump 52 and delivered to the demineralized water tank 62, which stores the demineralized water and condensate. A deaerator pump 63 pressurizes the qualified feed water in the demineralized water tank 62 and delivers it to the feedwater preheater 64 for preheating. The water is then delivered to the deaerator 65 for deoxygenation. The deoxygenated feed water from the deaerator 65 is then pressurized by the boiler feedwater pump 61 and delivered to the dry coke quenching boiler 10, where it exchanges heat with the high-temperature flue gas. When the deoxygenated feed water enters the CDQ boiler 10, it first enters the economizer 14. After being heated by the economizer 14, it enters the steam drum 11 through the water inlet pipe 37. The feed water in the steam drum 11 enters the evaporator 15 through the water outlet pipe 38. A steam-water mixture is formed in the evaporator 15 and then returns to the steam drum 11 through the steam outlet pipe 39. The steam in the steam drum 11 is superheated in the low-temperature superheater 121, and then the temperature is adjusted by the superheater water spray desuperheater. It enters the high-temperature superheater 122 for further heating. After being heated to a preset temperature, it is sent to the high-pressure cylinder 21 of the steam turbine 20 for expansion. The steam turbine 20 drives the generator 70 to generate electricity, thereby improving the utilization rate of the sensible heat of the coke and improving the power generation efficiency of the CDQ power generation system.

[0056] In the embodiment of the present application, the desalted water tank 62 can be an open tank or a floating roof tank. The feedwater preheater 64 can be a heat pipe heat exchanger or other types of heat exchangers. The deaerator 65 can be an atmospheric deaerator 65 or a pressure deaerator 65. The heating steam source for the deaerator 65 can be steam supplied by the plant network or regulated or non-regulated extraction steam from the steam turbine 20, which is not limited in this application.

[0057] In some embodiments of the present application, Figure 1 As shown, the CDQ power generation system further includes a regulating valve 342 , the water supply pipe 34b includes a condensate pipe 341 , and the regulating valve 342 is provided on the condensate pipe 341 for controlling pressure loss to balance the pressure in the power generation system.

[0058] In the embodiment of this application, Figure 1 As shown, a regulating valve 342 is provided on the condensate pipe 341 to adjust the pressure loss in the condensate pipe 341 by adjusting the flow rate of condensate in the condensate pipe 341, thereby achieving balance in the desuperheating water system.

[0059] In some embodiments of the present application, Figure 1 As shown, the water inlet of the second cooling water pipe 36 is connected to the condensate pipe 341 , and the water inlet of the second cooling water pipe 36 is arranged between the regulating valve 342 and the water outlet of the condensate pump 52 .

[0060] In some embodiments of the present application, Figure 1As shown, the low-pressure bypass device 42 further includes a temperature reduction and pressure reduction device 43 , which is disposed on the low-pressure bypass pipe 421 .

[0061] In the embodiment of the present application, the temperature and pressure reduction device 43 further reduces the temperature and pressure of the steam in the low-pressure bypass pipe 421 and sends it to the condenser 51, thereby reducing the probability of damage to the condenser 51 due to excessively high steam temperature or pressure sent to the condenser 51, and improving the safety of the dry quenching power generation system.

[0062] In some embodiments, the temperature reduction and pressure reduction device 43 may also be provided on the condenser 51. Specifically, the temperature reduction and pressure reduction device 43 may be a three-stage temperature reduction and pressure reduction device.

[0063] In some embodiments of the present application, the CDQ power generation system further includes a generator 70 , which is connected to the high-pressure cylinder 21 and the low-pressure cylinder 22 .

[0064] In the embodiment of this application, Figure 1 As shown, the high-pressure cylinder 21 and the low-pressure cylinder 22 can be coaxially arranged. The CDQ boiler 10 can drive a generator 70 to generate electricity via the steam turbine 20. Steam in the main steam line 31 enters the high-pressure cylinder 21, expands and generates work, driving the generator 70 to generate electricity. Steam in the high-temperature reheat steam line 33 enters the low-pressure cylinder 22, expands and generates work, driving the generator 70 to generate electricity.

[0065] In the embodiment of the present application, steam entering the high-pressure cylinder 21 and low-pressure cylinder 22 of the steam turbine 20 expands and produces work, converting the steam's thermal energy into mechanical energy. The steam turbine 20 drives the generator 70, converting the mechanical energy into electrical energy. This electrical energy can be used as a power source to drive electrical devices, thereby improving the utilization rate of the coke's sensible heat and the power generation efficiency of the CDQ power generation system.

[0066] In some embodiments of the present application, Figure 1 As shown, the CDQ boiler 10 further includes an economizer 14, the water inlet of the economizer 14 being connected to an end of the water supply pipe 34b away from the low-pressure cylinder 22; the CDQ power generation system further includes a water inlet pipe 37, one end of the water inlet pipe 37 being connected to the water outlet of the economizer 14, and the other end being connected to the water inlet of the steam drum 11.

[0067] In the embodiment of this application, Figure 1As shown, economizer 14 is installed at the bottom of CDQ boiler 10. Economizer 14 is used to recover waste heat from CDQ boiler 10's exhaust gas to heat feed water, which is delivered to CDQ boiler 10 via feedwater pipe 34b. The heated feedwater is then delivered to steam drum 11. Economizer 14 also absorbs heat from the high-temperature flue gas within CDQ boiler 10, reducing its temperature, saving energy, and improving efficiency. Water inlet pipe 37 is used to deliver the feedwater heated by economizer 14 to steam drum 11. Economizer 14 can be a single-stage economizer 14 or a multi-stage economizer 14, which is not limited in this application.

[0068] In some embodiments of the present application, the boiler further includes an evaporator 15, which is placed in the dry quenching boiler 10; the dry quenching power generation system further includes: a water outlet pipe 38 and a steam outlet pipe 39, the water outlet pipe 38 connecting the water outlet of the steam drum 11 and the water inlet of the evaporator 15; the steam outlet pipe 39 connecting the steam outlet of the evaporator 15 and the steam inlet of the steam drum 11.

[0069] In the embodiment of this application, Figure 1 As shown, the evaporator 15 is used to exchange heat between the feedwater flowing out of the steam drum 11 and the high-temperature flue gas from the CDQ boiler 10, producing a steam-water mixture that is then returned to the boiler drum 11. The feedwater from the steam drum 11 flows through the water outlet pipe 38 and enters the evaporator 15. The feedwater in the evaporator 15 exchanges heat with the high-temperature flue gas from the CDQ boiler 10, producing a steam-water mixture that is then returned to the boiler drum 11 through the steam outlet pipe 39. The evaporator 15 is the primary steam-generating structure of the CDQ boiler 10 and is located in the central region of the CDQ boiler 10. The evaporator 15 can be a single-stage evaporator 15 or a multi-stage evaporator 15, and can be a bare tube evaporator 15 or a finned tube evaporator 15, although this application does not limit this.

[0070] The CDQ boiler 10 also includes a water-cooled wall (not shown). This water-cooled wall is the boiler's primary evaporative heating surface. It is typically installed vertically on the inner wall of the boiler furnace, typically in a tubular or membrane configuration. The water-cooled wall absorbs radiant heat from the high-temperature flames or flue gases in the furnace, heating the water flowing within it and generating steam or hot water. Because the water within the water-cooled wall absorbs significant amounts of heat generated by the furnace, the heat load on the furnace wall is reduced, lowering its temperature. Consequently, the water-cooled wall also serves to protect the furnace wall.

[0071] An embodiment of the second aspect of the present application provides a coke dry quenching device, including the coke dry quenching power generation system in the above embodiment.

[0072] In the embodiment of the present application, the dry coke quenching equipment includes the dry coke quenching power generation system described in the above embodiment. In the dry coke quenching power generation system, steam from the drum 11 of the boiler enters the superheater 12. The superheater 12 heats the steam to a preset temperature and then transmits it to the high-pressure cylinder 21 of the steam turbine 20 via the main steam pipe 31. During the process of partial expansion and work in the high-pressure cylinder 21, the steam temperature gradually decreases. The reduced steam is output from the steam outlet of the high-pressure cylinder 21 and enters the reheater 13 via the low-temperature reheat steam pipe 32, so that the reheater 13 reheats the cooled steam. After the steam is reheated to the preset temperature, it is transmitted to the low-pressure cylinder 22 of the steam turbine 20 via the high-temperature reheat steam pipe 33 for expansion and work. After the work is completed, the remaining steam returns to the dry coke quenching boiler 10 via the exhaust pipe 34a and the feedwater pipe 34b. After the steam expands and performs work in the high-pressure cylinder 21, the reduced-temperature steam can be further heated via the reheater 13 and then enter the low-pressure cylinder 22 to continue performing work and generating electricity. This improves the utilization rate of the steam in the CDQ boiler 10, thereby improving the utilization rate of the sensible heat of the coke and the power generation efficiency of the CDQ power generation system. The CDQ power generation system also includes a high-pressure bypass pipe 411 connecting the main steam pipe 31 and the low-temperature reheat steam pipe 32. During the initial startup of the CDQ power generation system, the reheater 13 may be started before the steam turbine 20. In this case, the steam in the main steam pipe 31 can bypass the high-pressure cylinder 21 of the steam turbine 20 and instead pass through the high-pressure bypass pipe 411 to reduce the temperature and pressure of the main steam to form low-temperature reheat steam, which then enters the low-temperature reheat steam pipe 32 and then the reheater 13. This reduces the probability of dry burning of the reheater 13 and damage to the reheater 13. During the operation of the CDQ power generation system, the high-pressure bypass device 41 can also divide the pressure of the main steam line 31 when the pressure in the main steam line 31 is too high, diverting the steam in the main steam line 31 to the high-pressure bypass line 411. This reduces the probability of damage to the main steam line 31 due to excessive pressure in the main steam line 31 and increases the safety of the CDQ power generation system. The low-pressure bypass device 42 can reduce the temperature and pressure of the steam in the high-temperature reheat steam line 33, forming low-temperature, low-pressure steam, which is then delivered to the exhaust line 34a. When the steam turbine 20 in the CDQ power generation system is not started, the steam in the high-temperature reheat steam line 33 can enter the exhaust line 34a directly via the low-pressure bypass line 421, and then enter the CDQ boiler 10, without passing through the low-pressure cylinder 22 of the steam turbine 20. When the CDQ power generation system is operating, the low-pressure bypass device 42 can separate the pressure of the high-temperature reheat steam pipe 33 when the air pressure in the high-temperature reheat steam pipe 33 is too high, and divert the steam in the high-temperature reheat steam pipe 33 to the low-pressure bypass pipe 421, thereby increasing the safety of the CDQ power generation system.

[0073] In the embodiment of the present application, a CDQ power generation system with intermediate single reheating is adopted. Based on the different pressures in the high-pressure bypass device 41 and the low-pressure bypass device 42, the intermediate tap of the boiler feed water pump 61 in the power generation system is used to provide cooling water to the first cooling water pipe 35, and the condensate pump 52 provides power for the cooling water in the second cooling water pipe 36. This can better reduce the energy consumption of the power generation system without affecting the selection of the boiler feed water pump, thereby reducing the energy consumption of the CDQ equipment and making the CDQ equipment more energy-efficient and environmentally friendly.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the scope of protection of the present application.

Claims

1. A dry quenching coke power generation system, characterized in that: include: A dry coke quenching boiler (10) comprises a steam drum (11), a superheater (12), and a reheater (13); the superheater (12) is connected to the steam drum (11) and is used to heat the steam generated by the steam drum (11); The steam turbine (20) comprises a high-pressure cylinder (21) and a low-pressure cylinder (22); the reheater (13) is used to heat the steam output from the high-pressure cylinder (21); a main steam pipe (31), one end of which is connected to the superheater (12) and the other end of which is connected to the steam inlet of the high-pressure cylinder (21); a low-temperature reheat steam pipe (32), one end of which is connected to the steam outlet of the high-pressure cylinder (21) and the other end of which is connected to the reheater (13); a high-temperature reheat steam pipe (33), one end of which is connected to the reheater (13) and the other end of which is connected to the steam inlet of the low-pressure cylinder (22); An exhaust pipe (34a) and a water supply pipe (34b), and a condenser (51), a condensate pump (52), and a boiler feed water pump (61) arranged on the water supply pipe (34b), wherein one end of the exhaust pipe (34a) is connected to the steam outlet of the low-pressure cylinder (22), and the other end is connected to the inlet of the condenser (51); one end of the water supply pipe (34b) is connected to the outlet of the condenser (51), and the other end is connected to the water inlet of the dry quenching boiler (10); A high-pressure bypass device (41) includes a high-pressure bypass pipe (411), wherein the high-pressure bypass pipe (411) is connected to the main steam pipe (31) and the low-temperature reheat steam pipe (32); A low-pressure bypass device (42); comprising a low-pressure bypass pipe (421), wherein the low-pressure bypass pipe (421) is connected to the high-temperature reheat steam pipe (33) and the exhaust steam pipe (34a); A first cooling water pipe (35), the water inlet of which is in communication with the boiler feed water pump (61), and the water outlet of which is in communication with the high-pressure bypass pipe (411); the cooling water in the first cooling water pipe (35) is used to cool the steam in the high-pressure bypass pipe (411); The second cooling water pipe (36) has a water inlet connected to the condensate pump (52) and a water outlet connected to the low-pressure bypass pipe (421); the cooling water in the second cooling water pipe (36) is used to cool the steam in the low-pressure bypass pipe (421).

2. The dry quenching coke power generation system according to claim 1, characterized in that: The high-pressure bypass device (41) further includes a first control valve (412) provided on the high-pressure bypass pipeline (411); the low-pressure bypass device (42) further includes a second control valve (422) provided on the low-pressure bypass pipeline (421).

3. The dry quenching coke power generation system according to claim 1, characterized in that: The dry quenching power generation system further includes a desalted water tank (62), a deaerator water pump (63), a feed water preheater (64), and a deaerator (65) sequentially arranged on the feed water pipe (34b), wherein the water inlet of the desalted water tank (62) is connected to the water outlet of the condensate pump (52), and the water outlet of the deaerator (65) is connected to the water inlet of the boiler feed water pump (61).

4. The dry quenching coke power generation system according to claim 1, characterized in that: The dry quenching power generation system further includes a regulating valve (342), the water supply pipeline (34b) includes a condensate pipeline (341), and the regulating valve (342) is provided on the condensate pipeline (341) and is used to control pressure loss to balance the pressure in the power generation system.

5. The dry quenching coke power generation system according to claim 4, characterized in that: The water inlet of the second cooling water pipe (36) is connected to the condensate water pipe (341), and the water inlet of the second cooling water pipe (36) is arranged between the regulating valve (342) and the water outlet of the condensate pump (52).

6. The dry quenching coke power generation system according to claim 1, characterized in that: The low-pressure bypass device (42) further includes a temperature reduction and pressure reduction device (43), and the temperature reduction and pressure reduction device (43) is provided on the low-pressure bypass pipeline (421).

7. The dry quenching coke power generation system according to claim 1, characterized in that: The dry quenching power generation system further includes a generator (70), and the generator (70) is connected to the high-pressure cylinder (21) and the low-pressure cylinder (22).

8. The dry quenching coke power generation system according to any one of claims 1 to 7, characterized in that: The dry quenching boiler (10) further includes an economizer (14), wherein a water inlet of the economizer (14) is connected to an end of the water supply pipe (34b) away from the low-pressure cylinder (22); The dry quenching power generation system further comprises a water inlet pipe (37), one end of which is in communication with the water outlet of the economizer (14), and the other end of which is in communication with the water inlet of the steam drum (11).

9. The dry quenching coke power generation system according to claim 8, characterized in that: The boiler further comprises an evaporator (15), and the evaporator (15) is placed in the dry quenching boiler (10); The dry quenching coke power generation system further includes: a water outlet pipe (38), the water outlet pipe (38) being connected to the water outlet of the steam drum (11) and the water inlet of the evaporator (15); A steam outlet pipe (39) is connected to the steam outlet of the evaporator (15) and the steam inlet of the steam drum (11).

10. A coke dry quenching device, characterized in that: A dry quenching coke power generation system comprising the dry quenching coke power generation system according to any one of claims 1 to 9.

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