Dry quenching waste heat power generation deoxygenization water supply system and adjusting method thereof

Abstract

The invention belongs to the technical field of dry quenching waste heat power generation, and particularly relates to a dry quenching waste heat power generation deoxygenization water supply system and an adjusting method thereof. Comprising EDI (electrodeionization) equipment, a steam extraction condensing steam turbine or a pure condensing steam turbine, a condenser, a condensate pump, a demineralized water tank of a dry quenching boiler water supply pump station, a deoxygenization water supply pump, a deoxygenization water supply regulating valve group, a three-way valve, a water-water heat exchanger, a water supply preheater and a thermal deaerator. The system has the beneficial effects that a desalting water tank and a secondary desalting water pump of a desalting water station are omitted; the fixed pressure difference of the regulating valve is used as main regulation, and the three-way valve is used as auxiliary regulation to ensure normal operation of sampling equipment; after deoxygenated water supply is heated by the water-water heat exchanger, one part of sewage is fed into the dry quenching body circulating water tank for normal production, and the other part of sewage is fed back to a sewage discharge well, so that the temperature of the sewage is reduced, heat and water resources are fully utilized, and meanwhile, the adverse effect of white smoke generated by sewage discharge on a drainage system and the environment is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of dry coke quenching waste heat power generation, and in particular relates to a dry coke quenching waste heat power generation deoxygenation water supply system and a regulation method thereof. Background Art

[0002] The deoxygenated feed water system is an important component of the CDQ waste heat power generation system. At present, the process of the deoxygenated feed water system of CDQ is basically as follows: the secondary desalted water produced by the EDI electric desalting equipment of the desalting water station first enters the desalting water tank of the desalting water station, and then is pressurized by the secondary desalting water pump and sent to the desalting water tank of the CDQ boiler feed water pump station. At the same time, the condensate water of CDQ power generation is also sent to the desalting water tank of the CDQ boiler feed water pump station through the condensate pump; the outlet water of the desalting water tank of the CDQ boiler feed water pump station is pressurized by the deoxygenated feed water pump, and sent to the thermal deaerator after passing through the feed water preheater; the secondary steam of the continuous blowdown expander is connected to the thermal deaerator, and the remaining heat sources required by the thermal deaerator need to be supplied by external low-pressure steam.

[0003] At present, industrial land is becoming increasingly scarce, and project cost control is also increasingly refined. From the above process, it can be seen that the deoxygenation water supply system includes both the desalting water tank of the desalting water station and the desalting water tank of the CDQ boiler feed water pump station, which not only increases the industrial land, but also increases the project cost.

[0004] The existing cooling method of the dry quenching boiler sampling equipment is to lead out a branch pipe from the deoxygenated water supply main pipe to connect the cooling water supply pipe of the high-temperature and high-pressure rack cooler in the sampling equipment; the cooling water return water after the high-temperature and high-pressure rack cooler is connected to the deoxygenated water supply main pipe downstream of the lead-out point, and the return connection adopts a bevel connection method to reduce the resistance of the cooling water return water; a throttle valve is set on the deoxygenated water supply main pipe between the lead-out point and the return point, and the throttle valve opening is adjusted according to the cooling water supply inlet pressure of the high-temperature and high-pressure rack cooler, and the flow pressure of the cooling water supply and the pressure behind the throttle valve are controlled to ensure the flow pressure of the cooling water in the high-temperature and high-pressure rack cooler and the smooth flow of the cooling water return water. However, in the actual operation process, it is impossible to accurately control the pressure behind the throttle valve by adjusting the throttle valve opening, thereby affecting the stable flow of the deoxygenated water entering the sampling equipment, causing the sampling water temperature to be too high, and seriously affecting the normal operation of the sampling equipment.

[0005] At present, the continuous sewage from the CDQ boiler basically enters the periodic sewage expander and collects with the periodic sewage after the continuous sewage expander is expanded, and then merges into the boiler drain pipe and flows into the sewage well. However, the temperature of the sewage from the CDQ boiler is basically around 95°C, which has a high energy quality. It is directly sent to the sewage well for discharge, which on the one hand causes waste of water resources and energy; on the other hand, the sewage well will also produce "white smoke", which has an adverse effect on the drainage system and the environment. Summary of the invention

[0006] The purpose of the present invention is to provide a deoxygenated water supply system for power generation by waste heat from dry coke quenching and a regulating method thereof, which overcome the shortcomings of the prior art. First, by optimizing the system, the deoxygenated water tank of the deoxygenated water station and the secondary deoxygenated water pump are omitted, thereby reducing the land occupation, investment, operation and maintenance costs; second, the deoxygenated water supply bypass connected to the sampling equipment is arranged on both sides of the deoxygenated water supply regulating valve group, and the deoxygenated water supply bypass outlet is connected to the deoxygenated water supply main pipe by using a three-way valve, and the pressure difference is fixed by the regulating valve as the main regulation, and the three-way valve is used as the auxiliary regulation to ensure the normal operation of the sampling equipment; third, the continuous sewage discharge, regular sewage discharge and boiler drainage water of the dry coke quenching boiler are all separated into steam and water, and the secondary steam is collected and sent to the thermal deaerator to heat the feed water, and the drainage is heated by the water-to-water heat exchanger to heat the deoxygenated feed water, so that the heat of the boiler sewage can be fully utilized, and the adverse effects of the "white smoke" generated by the sewage discharge on the drainage system and the environment can be eliminated.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] Technical solution one: 1. A deoxygenated water supply system for dry coke quenching waste heat power generation, comprising an EDI electric desalting device, an extraction condensing steam turbine or a pure condensing steam turbine, a condenser, a condensate pump, a desalted water tank of a dry coke quenching boiler feed water pump station, a deoxygenated water pump, a deoxygenated water supply regulating valve group, a three-way valve, a water-to-water heat exchanger, a feed water preheater and a thermal deaerator; at least two inlets are provided on the top of the desalted water tank of the dry coke quenching boiler feed water pump station, including a secondary desalted water inlet and a condensate inlet; the secondary desalted water inlet is connected to the outlet of the EDI electric desalting device through the desalted water regulating valve group; the condensate inlet is connected to the condenser outlet through the condensate pump;

[0009] The bottom of the desalted water tank of the CDQ boiler feed water pump station is provided with an outlet, which is connected to the inlet of the deoxygenated feed water pump through a pipeline;

[0010] The outlet of the deoxygenated water supply pump is connected to the deoxygenated water supply regulating valve group, the three-way valve, the water-to-water heat exchanger, and the water supply preheater in sequence through the deoxygenated water supply main pipe, and finally connected to the deoxygenated water supply inlet of the thermal deaerator; the three-way valve is a combining valve, one inlet of which is connected to the deoxygenated water supply regulating valve group, and the outlet of which is connected to the water-to-water heat exchanger.

[0011] Furthermore, it also includes a sampling device, wherein the high-temperature side cooling water inlet of the sampling device is connected to a branch pipe from the deaeration water supply main pipe in front of the deaeration water supply regulating valve group, and the high-temperature side cooling water outlet pipeline is connected to the second inlet of the three-way valve.

[0012] Furthermore, it also includes a continuous blowdown expander, a periodic blowdown expander, a drain expansion tank, a blowdown well, a submerged blowdown pump, a multi-media filter and a CDQ body circulating water tank, wherein: the secondary steam outlet at the top of the continuous blowdown expander is connected to the secondary steam main pipe through a pipeline, and a first check valve is provided on the pipeline; the drain outlet at the bottom of the continuous blowdown expander is connected to the drain inlet of the periodic blowdown expander through a pipeline; the sewage outlet at the bottom of the continuous blowdown expander is connected to the first boiler sewage pipeline through a pipeline and sent to the bottom of the blowdown well;

[0013] The secondary steam outlet at the top of the periodic sewage expansion device is connected to the secondary steam main pipe through a pipeline, and a second check valve is arranged on the pipeline; the sewage outlet at the bottom of the periodic sewage expansion device is connected to the sewage pipeline of the first boiler through a pipeline and sent to the bottom of the sewage well;

[0014] The multiple inlets at the top of the drain expansion tank are connected to the dry quenching boiler drainage pipeline, and the secondary steam outlet at the top is merged into the secondary steam main pipe through a pipeline, and a third check valve is arranged on the pipeline; the sewage outlet at the bottom of the drain expansion tank is merged into the sewage pipeline of the first boiler through a pipeline and sent to the bottom of the sewage well;

[0015] The suction port of the submersible sewage pump is arranged at the bottom of the sewage well; the outlet of the submersible sewage pump is connected to the inlet of the multi-media filter through a pipeline;

[0016] The hot end inlet of the water-to-water heat exchanger is connected to the outlet of the multi-media filter through a pipeline; the hot end outlet of the water-to-water heat exchanger is divided into two paths, one of which is connected to the bottom of the sewage well through a first electric shut-off valve and a pipeline, and the other is connected to the inlet of the CDQ body circulating water tank through a second electric shut-off valve and a pipeline.

[0017] Furthermore, the hot end inlet of the feed water preheater is circulating gas at 160-170°C, and the hot end outlet is circulating gas at about 130°C.

[0018] Furthermore, the secondary steam inlet of the thermal deaerator is connected to the secondary steam main pipe, and the water outlet of the thermal deaerator is connected to the boiler feed water pump inlet through a pipeline.

[0019] Furthermore, a retaining wall is set at the bottom of the sewage well, and the height of the retaining wall is 0.3 to 0.5 times the depth of the sewage well. The first boiler sewage pipeline and the pipeline after the first electric shut-off valve are arranged on one side of the sewage well retaining wall, and the end of the pipeline is 200 to 400 mm higher than the bottom of the sewage well. The suction port of the submersible sewage pump and the sewage well liquid level recording instrument are arranged on the other side of the sewage well retaining wall. The suction port of the submersible sewage pump is 200 to 400 mm higher than the bottom of the sewage well, and the center of the overflow pipe is 300 to 1000 mm lower than the top of the sewage well.

[0020] Furthermore, the filter material of the multi-media filter includes anthracite and quartz sand, and the multi-media filter cylinder and internal components are made of S30408 ​​stainless steel or carbon steel lining rubber resistant to 100°C.

[0021] Technical solution 2: A method for regulating a deoxygenation water supply system for dry coke quenching waste heat power generation, comprising the following steps:

[0022] 1) Desalting water tank level adjustment: the secondary desalting water at the outlet of the EDI electric desalting equipment is sent to the desalting water tank of the dry coke quenching boiler feed water pump station through the desalting water regulating valve group. The desalting water regulating valve group adjusts the valve opening according to the desalting water tank level recording control instrument to ensure that the liquid level of the desalting water tank of the dry coke quenching boiler feed water pump station is maintained at the set value; the exhaust steam of the extraction condensing steam turbine or the pure condensing steam turbine is converted into condensate after heat exchange with the circulating cooling water in the condenser, and is sent to the desalting water tank of the dry coke quenching boiler feed water pump station through the condensate pump to mix with the secondary desalting water as the source of deoxygenated feed water;

[0023] 2) Deaerator liquid level adjustment. The deoxygenated feed water at the outlet of the desalting water tank of the CDQ boiler feed water pump station is pressurized by the deoxygenated feed water pump, and passes through the deoxygenated feed water regulating valve group, three-way valve, water-to-water heat exchanger, feed water preheater and thermal deaerator in sequence. After thermal deoxygenation, qualified deoxygenated feed water is obtained and then sent to the boiler feed water pump; wherein, the deoxygenated feed water pump and the desalting water tank liquid level recording and control instrument are interlocked. When the desalting water tank liquid level reaches the minimum limit value, the deoxygenated feed water pump stops running. The deoxygenated feed water regulating valve group adjusts the valve opening according to the deaerator liquid level recording and control instrument to ensure that the liquid level of the thermal deaerator is maintained at the set value. The boiler feed water pump and the deaerator liquid level recording and control instrument are interlocked. When the thermal deaerator liquid level reaches the minimum limit value, the boiler feed water pump stops running;

[0024] 3) The sampling equipment corresponds to the pressure regulation before and after the deoxygenated water supply main pipe, and the deoxygenated water supply bypass is led out in front of the deoxygenated water supply regulating valve group, and heat is exchanged through the high-temperature side of the sampling equipment, and connected to the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group by using a three-way valve. The pressure difference is fixed by the regulating valve as the main regulation, and the three-way valve is used as the auxiliary regulation to ensure that the pressure of the deoxygenated water supply bypass pipeline after the sampling equipment is significantly higher than the pressure of the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group, so as to promote the stable flow of deoxygenated water supply in the sampling equipment, thereby ensuring the normal operation of the sampling equipment;

[0025] 4) Liquid level adjustment of the sewage well and the CDQ body circulating water tank. The continuous sewage, periodic sewage and drainage water of the CDQ boiler are separated by steam and water. The secondary steam is sent to the thermal deaerator to heat the deoxygenated feed water. The boiler sewage is connected to the sewage well; the boiler sewage is pressurized by the submerged sewage pump and sent to the multi-media filter to filter out some impurities. After heating the deoxygenated feed water through the water-to-water heat exchanger, it is divided into two paths. One path passes through the first electric shut-off valve and returns to the bottom of the sewage well. The other path passes through the second electric shut-off valve and is sent to the CDQ body circulating water tank; Among them, The long-axis submersible sewage pump and the sewage well liquid level recording instrument are interlocked. When the sewage well liquid level reaches the lowest limit value, the long-axis submersible sewage pump stops running; the first electric cut-off valve, the second electric cut-off valve and the circulating water tank liquid level recording instrument are interlocked. When the circulating water tank liquid level reaches the low limit value, the second electric cut-off valve opens and the first electric cut-off valve closes; when the circulating water tank liquid level reaches the high limit value, the second electric cut-off valve closes and the first electric cut-off valve opens; when the sewage well liquid level is higher than the bottom of the overflow pipe, the sewage flows by gravity into the external drainage pipeline.

[0026] Furthermore, the pressure difference before and after the deoxygenation water supply regulating valve group is 0.3-0.5 MPa.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) The deionized water supply part of the deoxygenation water supply system is optimized, that is, the secondary deionized water at the outlet of the EDI electric deionizer directly enters the deionized water tank of the CDQ boiler feed water pump station after passing through the deionized water regulating valve group, eliminating the deionized water tank and secondary deionized water pump of the deionized water station, reducing land occupation, investment, operation and maintenance costs;

[0029] 2) The deoxygenated water supply bypass connection point entering the sampling device was rearranged and arranged on both sides of the deoxygenated water supply regulating valve group, and the deoxygenated water supply bypass outlet was connected to the deoxygenated water supply main pipe by using a three-way valve. The pressure difference was fixed by the regulating valve as the main regulation, and the three-way valve was used as the secondary regulation to ensure that the pressure of the deoxygenated water supply bypass pipeline after the sampling device was significantly higher than the pressure of the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group, so as to promote the deoxygenated water supply to flow stably in the sampling device, thereby ensuring the normal operation of the sampling device;

[0030] 3) The steam and water of boiler blowdown and drainage water are separated respectively, and the secondary steam is sent to the thermal deaerator to heat the deoxygenated feed water. After the blowdown water passes through the water-to-water heat exchanger to heat the deoxygenated feed water, part of it is sent to the CDQ body circulating water tank for normal production, and the other part is sent back to the blowdown well to reduce the temperature of the blowdown water in the blowdown well. This can fully utilize the heat and water resources of boiler blowdown and drainage water, and can also eliminate the adverse effects of the "white smoke" generated by the blowdown on the drainage system and the environment;

[0031] 4) Set up desalted water regulating valve group, deaerator feed water regulating valve group, desalted water tank level recording and control instrument, sewage well level recording instrument, deaerator level recording and control instrument, circulating water tank level recording instrument, first electric shut-off valve and second electric shut-off valve to ensure the normal operation of the desalted water tank, thermal deaerator, sewage well, CDQ body circulating water tank, deaerator feed water pump, boiler feed water pump and long-axis submersible sewage pump of the CDQ boiler feed water pump station in the deaerator feed water system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention.

[0033] In the figure: 1-EDI electric desalting equipment, 2-secondary desalted water pipeline, 3-desalted water regulating valve group, 4-extraction condensing steam turbine or pure condensing steam turbine, 5-condenser, 6-condensate pump, 7-condensate pipeline, 8-desalted water tank of CDQ boiler feed water pump station, 9-desalted water tank level recording and control instrument, 10-deoxygenation feed water pump, 11-deoxygenation feed water main pipe, 12-deoxygenation feed water regulating valve group, 13-three-way valve, 14-sampling equipment, 15-water-water heat exchanger, 16-feed water preheater, 17-thermal deaerator, 18-CDQ boiler feed water pump, 19-connection Continued sewage expansion device, 20-periodic sewage expansion device, 21-drain expansion device, 22-first boiler sewage pipeline, 23-sewage well, 24-long axis submersible sewage pump, 25-second boiler sewage pipeline, 26-multi-media filter, 27-first electric shut-off valve, 28-second electric shut-off valve, 29-sewage well liquid level recording instrument, 30-first check valve, 31-second check valve, 32-third check valve, 33-secondary steam main pipe, 34-deaerator liquid level recording control instrument, 35-coke dry quenching body circulating water tank, 36-circulating water tank liquid level recording instrument. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, and other implementation methods can be obtained.

[0035] In order to simplify the drawings, only the parts related to the present invention are schematically shown in the drawings, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top” and “bottom” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0040] See Figure 1 , is a schematic structural diagram of an embodiment of a deoxygenated feedwater system for CDQ waste heat power generation according to the present invention, comprising an EDI electric desalination device 1, an extraction condensing steam turbine or a pure condensing steam turbine 4, a condenser 5, a condensate pump 6, a desalted water tank 8 of a CDQ boiler feedwater pump station, a deoxygenated feedwater pump 10, a deoxygenated feedwater regulating valve group 12, a three-way valve 13, a water-to-water heat exchanger 15, a feedwater preheater 16 and a thermal deaerator 17.

[0041] At least two inlets are provided on the top of the desalted water tank 8 of the dry coke quenching boiler feed water pump station, including a secondary desalted water inlet and a condensate inlet. The secondary desalted water inlet is connected to the outlet of the EDI electric desalting equipment 1 through the secondary desalted water pipeline 2, the desalted water regulating valve group 3, and the condensate inlet is connected to the outlet of the condenser 5 through the condensate pump 6, the condensate pipeline 7.

[0042] The bottom of the desalted water tank 8 of the CDQ boiler feed water pump station is provided with an outlet, which is connected to the inlet of the deoxygenated feed water pump 10 through the deoxygenated feed water main pipe 11.

[0043] The outlet of the deoxygenated water supply pump 10 is connected to the deoxygenated water supply regulating valve group 12, the three-way valve 13, the water-to-water heat exchanger 15, and the water supply preheater 16 in sequence through the deoxygenated water supply main pipe 11, and finally connected to the deoxygenated water supply inlet of the thermal deaerator 17. The three-way valve 13 is a converging valve, the first inlet of which is connected to the deoxygenated water supply regulating valve group 12, the second inlet is connected to the sampling device 14, and the outlet is connected to the water-to-water heat exchanger 15.

[0044] The deionized water regulating valve group 3 includes two parallel pipelines, the main pipeline includes two cut-off valves and a flow regulating valve, and the flow regulating valve is located between the two cut-off valves; the bypass includes a stop valve. The deoxygenated feed water regulating valve group 12 includes two parallel pipelines, the main pipeline includes two cut-off valves and a flow regulating valve, and the flow regulating valve is located between the two cut-off valves; the bypass includes a throttle valve.

[0045] The system also includes a sampling device 14 , and the cooling water inlet on the high temperature side of the sampling device 14 is connected to a branch pipe from the deaeration water supply main pipe 11 in front of the deaeration water supply regulating valve group 12 .

[0046] The system also includes a continuous blowdown expander 19, a periodic blowdown expander 20, a drain expansion tank 21, a blowdown well 23, a submerged blowdown pump 24, a multi-media filter 26 and a CDQ body circulating water tank 35. Among them, the secondary steam outlet at the top of the continuous blowdown expander 19 is connected to the secondary steam main pipe 33 through a pipeline, and a first check valve 30 is arranged on the pipeline; the drain outlet at the bottom of the continuous blowdown expander 19 is connected to the drain inlet of the periodic blowdown expander 20 through a pipeline; the sewage outlet at the bottom of the continuous blowdown expander 19 is connected to the first boiler sewage pipeline 22 through a pipeline and sent to the bottom of the blowdown well 23.

[0047] The secondary steam outlet at the top of the periodic sewage expansion device 20 is connected to the secondary steam main pipe 33 through a pipeline, and a second check valve 31 is arranged on the pipeline; the sewage outlet at the bottom of the periodic sewage expansion device 20 is connected to the first boiler sewage pipeline 22 through a pipeline and sent to the bottom of the sewage well 23.

[0048] Multiple inlets at the top of the drain expansion tank 21 are connected to the dry quenching boiler drainage pipeline, and the top secondary steam outlet is merged into the secondary steam main pipe 33 through a pipeline, and a third check valve 32 is arranged on the pipeline; the bottom sewage outlet of the drain expansion tank 21 is merged into the first boiler sewage pipeline 22 through a pipeline and sent to the bottom of the sewage well 23.

[0049] A retaining wall is set at the bottom of the sewage well 23, and the height of the retaining wall is 0.3 to 0.5 times the depth of the sewage well. The first boiler sewage pipe 22 and the pipeline after the first electric shut-off valve 27 are arranged on one side of the retaining wall of the sewage well 23, and the end of the pipeline is 200 to 400 mm higher than the bottom of the sewage well. The suction port of the submerged sewage pump 24 and the sewage well liquid level recording instrument 29 are arranged on the other side of the retaining wall of the sewage well 23. The suction port of the submerged sewage pump 24 is 200 to 400 mm higher than the bottom of the sewage well 23, and the center of the overflow pipe is 300 to 1000 mm lower than the top of the sewage well 23. The suction port of the submerged sewage pump 24 is arranged at the bottom of the sewage well 23; the outlet of the submerged sewage pump 24 is connected to the inlet of the multi-media filter 26 through the second boiler sewage pipe 25.

[0050] The hot end inlet of the water-to-water heat exchanger 15 is connected to the outlet of the multi-media filter 26 through a pipeline; the hot end outlet of the water-to-water heat exchanger 15 is divided into two paths, one of which is connected to the bottom of the sewage well 23 through the first electric shut-off valve 27 and a pipeline, and the other is connected to the inlet of the CDQ body circulating water tank 35 through the second electric shut-off valve 28 and a pipeline. The water-to-water heat exchanger 15 is a tubular heat exchanger or a plate heat exchanger.

[0051] The hot end inlet of the feed water preheater 16 is circulating gas at 160-170°C, and the hot end outlet is circulating gas at about 130°C.

[0052] The secondary steam inlet of the thermal deaerator 17 is connected to the secondary steam main pipe 33, and the water outlet of the thermal deaerator 17 is connected to the inlet of the boiler feed water pump 18 through a pipeline.

[0053] The filter material of the multi-media filter 26 includes anthracite and quartz sand, and the cylinder and internal components of the multi-media filter 26 are made of S30408 ​​stainless steel or carbon steel lining rubber resistant to 100°C.

[0054] The adjustment method of the embodiment of the dry coke quenching waste heat power generation deoxygenation water supply system of the present invention comprises the following steps:

[0055] 1) Desalting water tank level adjustment: the secondary desalting water at the outlet of the EDI electric desalting device 1 is sent to the desalting water tank 8 of the dry coke quenching boiler feed water pump station through the desalting water regulating valve group 3. The desalting water regulating valve group 3 adjusts the valve opening according to the desalting water tank level recording control instrument 9 to ensure that the liquid level of the desalting water tank 8 of the dry coke quenching boiler feed water pump station is maintained at the set value; the exhaust steam of the extraction condensing steam turbine or the pure condensing steam turbine 4 is converted into condensed water after heat exchange with the circulating cooling water in the condenser 5, and is sent to the desalting water tank 8 of the dry coke quenching boiler feed water pump station through the condensate pump 6 to mix with the secondary desalting water as the source of deoxygenated feed water;

[0056] 2) Deaerator liquid level adjustment. The deoxygenated feed water at the outlet of the desalting water tank 8 of the CDQ boiler feed water pump station is pressurized by the deoxygenated feed water pump 10, passes through the deoxygenated feed water regulating valve group 12, the three-way valve 13, the water-to-water heat exchanger 15, the feed water preheater 16 and the thermal deaerator 17 in sequence, and is sent to the boiler feed water pump 18 after obtaining qualified deoxygenated feed water through thermal deoxygenation; wherein, the deoxygenated feed water pump 10 is interlocked with the desalting water tank liquid level recording and control instrument 9. When the liquid level of the desalting water tank reaches the minimum limit value, the deoxygenated feed water pump 10 stops running. The deoxygenated feed water regulating valve group 12 adjusts the valve opening according to the deaerator liquid level recording and control instrument 34 to ensure that the liquid level of the thermal deaerator 17 is maintained at the set value. The boiler feed water pump 18 is interlocked with the deaerator liquid level recording and control instrument 34. When the liquid level of the thermal deaerator 17 reaches the minimum limit value, the boiler feed water pump 18 stops running;

[0057] 3) The sampling device corresponds to the pressure regulation before and after the deoxygenated water supply main pipe. A deoxygenated water supply bypass is led out in front of the deoxygenated water supply regulating valve group 12, and heat is exchanged through the high-temperature side of the sampling device 14. The three-way valve 13 is used to connect to the deoxygenated water supply main pipe 11 after the deoxygenated water supply regulating valve group 12. The pressure difference is fixed by the regulating valve as the main regulation. The pressure difference before and after the deoxygenated water supply regulating valve group is 0.3-0.5MPa. The three-way valve 13 is used as the secondary regulation to ensure that the pressure of the deoxygenated water supply bypass pipeline after the sampling device 14 is significantly higher than the pressure of the deoxygenated water supply main pipe 11 after the deoxygenated water supply regulating valve group 12, so as to promote the deoxygenated water supply to flow stably in the sampling device 14, thereby ensuring the normal operation of the sampling device 14;

[0058] 4) Liquid level adjustment of the sewage well and the CDQ body circulating water tank. The continuous sewage, periodic sewage and drainage water of the CDQ boiler are separated by steam and water, and the secondary steam is sent to the thermal deaerator 17 to heat the deoxygenated feed water. The boiler sewage is connected to the sewage well 23; the boiler sewage is pressurized by the submerged sewage pump 24 and sent to the multi-media filter 26 to filter out some impurities. After the deoxygenated feed water is heated by the water-to-water heat exchanger 15, it is divided into two paths. One path passes through the first electric shut-off valve 27 and returns to the bottom of the sewage well 23, and the other path passes through the second electric shut-off valve 28 and is sent to the CDQ body circulating water tank 35; among them, the long The long-axis submersible sewage pump 24 and the sewage well liquid level recording instrument 29 are interlocked. When the liquid level in the sewage well reaches the lowest limit value, the long-axis submersible sewage pump 24 stops running; the first electric cut-off valve 27, the second electric cut-off valve 28 and the circulating water tank liquid level recording instrument 36 are interlocked. When the circulating water tank liquid level reaches the low limit value, the second electric cut-off valve 28 opens and the first electric cut-off valve 27 closes; when the circulating water tank liquid level reaches the high limit value, the second electric cut-off valve 28 closes and the first electric cut-off valve 27 opens; when the sewage well liquid level is higher than the bottom of the overflow pipe, the sewage flows by gravity into the external drainage pipeline.

[0059] In the embodiment of the present invention, the desalted water supply part in the deoxygenated water supply system, that is, the secondary desalted water at the outlet of the EDI electric desalter 1 directly enters the desalted water tank 8 of the dry coke quenching boiler feed water pump station after passing through the desalted water regulating valve group, eliminating the desalted water tank and the secondary desalted water pump of the desalted water station, thereby reducing costs.

[0060] The bypass connection point of the deoxygenated water supply entering the sampling device 14 is arranged on both sides of the deoxygenated water supply regulating valve group 12. The fixed pressure difference of the regulating valve is used as the main regulation, and the three-way valve 13 is used as the auxiliary regulation to ensure that the pressure of the deoxygenated water supply bypass pipeline after the sampling device 14 is significantly higher than the pressure of the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group 12, thereby promoting the deoxygenated water supply to flow stably in the sampling device, thereby ensuring the normal operation of the sampling device.

[0061] Steam and water are separated from boiler blowdown and drainage water respectively, and secondary steam is sent to the thermal deaerator 17 to heat the deoxygenated feed water. After the blowdown water passes through the water-to-water heat exchanger 15 to heat the deoxygenated feed water, part of it is sent to the CDQ body circulating water tank 35 for normal production, and the other part is sent back to the blowdown well 23 to reduce the temperature of the blowdown water in the blowdown well. This can fully utilize the heat and water resources of boiler blowdown and drainage water, and also eliminate the adverse effects of the "white smoke" generated by the blowdown on the drainage system and the environment.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry coke quenching waste heat power generation deoxygenation water supply system, characterized in that: Including EDI electric desalting equipment, extraction condensing steam turbine or pure condensing steam turbine, condenser, condensate pump, desalting water tank of CDQ boiler feed water pump station, deaeration feed water pump, deaeration feed water regulating valve group, three-way valve, water-to-water heat exchanger, feed water preheater and thermal deaerator; The top of the desalted water tank of the dry coke quenching boiler feed water pump station is provided with at least two inlets, including a secondary desalted water inlet and a condensate inlet; the secondary desalted water inlet is connected to the outlet of the EDI electric desalting equipment through a desalted water regulating valve group; the condensate inlet is connected to the condenser outlet through a condensate pump; The bottom of the desalted water tank of the CDQ boiler feed water pump station is provided with an outlet, which is connected to the inlet of the deoxygenated feed water pump through a pipeline; The outlet of the deoxygenated water supply pump is connected to the deoxygenated water supply regulating valve group, the three-way valve, the water-to-water heat exchanger, and the water supply preheater in sequence through the deoxygenated water supply main pipe, and finally connected to the deoxygenated water supply inlet of the thermal deaerator; the three-way valve is a combining valve, one inlet of which is connected to the deoxygenated water supply regulating valve group, and the outlet of which is connected to the water-to-water heat exchanger.

2. A dry coke quenching waste heat power generation deoxygenation water supply system according to claim 1, characterized in that: It also includes a sampling device, wherein the high-temperature side cooling water inlet of the sampling device is connected to a branch pipe from the deaeration water supply main pipe in front of the deaeration water supply regulating valve group, and the high-temperature side cooling water outlet pipeline is connected to the second inlet of the three-way valve.

3. The deoxygenation and water supply system for dry coke quenching waste heat power generation according to claim 1, characterized in that: It also includes a continuous sewage expansion device, a periodic sewage expansion device, a drain expansion device, a sewage well, a submerged sewage pump, a multi-media filter and a CDQ body circulating water tank, among which: The secondary steam outlet at the top of the continuous sewage expansion device is connected to the secondary steam main pipe through a pipeline, and a first check valve is arranged on the pipeline; the drain outlet at the bottom of the continuous sewage expansion device is connected to the drain inlet of the periodic sewage expansion device through a pipeline; the sewage outlet at the bottom of the continuous sewage expansion device is connected to the first boiler sewage pipeline through a pipeline and sent to the bottom of the sewage well; The secondary steam outlet at the top of the periodic sewage expansion device is connected to the secondary steam main pipe through a pipeline, and a second check valve is arranged on the pipeline; the sewage outlet at the bottom of the periodic sewage expansion device is connected to the sewage pipeline of the first boiler through a pipeline and sent to the bottom of the sewage well; The multiple inlets at the top of the drain expansion tank are connected to the dry quenching boiler drainage pipeline, and the secondary steam outlet at the top is merged into the secondary steam main pipe through a pipeline, and a third check valve is arranged on the pipeline; the sewage outlet at the bottom of the drain expansion tank is merged into the sewage pipeline of the first boiler through a pipeline and sent to the bottom of the sewage well; The suction port of the submersible sewage pump is arranged at the bottom of the sewage well; the outlet of the submersible sewage pump is connected to the inlet of the multi-media filter through a pipeline; The hot end inlet of the water-to-water heat exchanger is connected to the outlet of the multi-media filter through a pipeline; the hot end outlet of the water-to-water heat exchanger is divided into two paths, one of which is connected to the bottom of the sewage well through a first electric shut-off valve and a pipeline, and the other is connected to the inlet of the CDQ body circulating water tank through a second electric shut-off valve and a pipeline.

4. The dry coke quenching waste heat power generation deoxygenation water supply system according to claim 1, characterized in that: The hot end inlet of the feed water preheater is circulating gas at 160-170°C, and the hot end outlet is circulating gas at about 130°C.

5. The dry coke quenching waste heat power generation deoxygenation water supply system according to claim 3, characterized in that: The secondary steam inlet of the thermal deaerator is connected to the secondary steam main pipe, and the water outlet of the thermal deaerator is connected to the boiler feed water pump inlet through a pipeline.

6. A CDQ waste heat power generation deoxygenation water supply system according to claim 5, characterized in that: A retaining wall is set at the bottom of the sewage well, and the height of the retaining wall is 0.3 to 0.5 times the depth of the sewage well. The first boiler sewage pipeline and the pipeline after the first electric shut-off valve are arranged on one side of the sewage well retaining wall, and the end of the pipeline is 200 to 400 mm higher than the bottom of the sewage well. The suction port of the submersible sewage pump and the sewage well liquid level recording instrument are arranged on the other side of the sewage well retaining wall. The suction port of the submersible sewage pump is 200 to 400 mm higher than the bottom of the sewage well, and the center of the overflow pipe is 300 to 1000 mm lower than the top of the sewage well.

7. A CDQ waste heat power generation deoxygenation water supply system according to claim 6, characterized in that: The filter material of the multi-media filter includes anthracite and quartz sand, and the multi-media filter cylinder and internal components are made of S30408 ​​stainless steel or 100°C temperature-resistant carbon steel lining rubber.

8. A method for regulating a deoxygenation water supply system for CDQ waste heat power generation according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Desalting water tank level adjustment: the secondary desalting water at the outlet of the EDI electric desalting equipment is sent to the desalting water tank of the dry coke quenching boiler feed water pump station through the desalting water regulating valve group. The desalting water regulating valve group adjusts the valve opening according to the desalting water tank level recording control instrument to ensure that the liquid level of the desalting water tank of the dry coke quenching boiler feed water pump station is maintained at the set value; the exhaust steam of the extraction condensing steam turbine or the pure condensing steam turbine is converted into condensate after heat exchange with the circulating cooling water in the condenser, and is sent to the desalting water tank of the dry coke quenching boiler feed water pump station through the condensate pump to mix with the secondary desalting water as the source of deoxygenated feed water; 2) Deaerator liquid level adjustment. The deoxygenated feed water at the outlet of the desalting water tank of the CDQ boiler feed water pump station is pressurized by the deoxygenated feed water pump, and passes through the deoxygenated feed water regulating valve group, three-way valve, water-to-water heat exchanger, feed water preheater and thermal deaerator in sequence. After thermal deoxygenation, qualified deoxygenated feed water is obtained and then sent to the boiler feed water pump; wherein, the deoxygenated feed water pump and the desalting water tank liquid level recording and control instrument are interlocked. When the desalting water tank liquid level reaches the minimum limit value, the deoxygenated feed water pump stops running. The deoxygenated feed water regulating valve group adjusts the valve opening according to the deaerator liquid level recording and control instrument to ensure that the liquid level of the thermal deaerator is maintained at the set value. The boiler feed water pump and the deaerator liquid level recording and control instrument are interlocked. When the thermal deaerator liquid level reaches the minimum limit value, the boiler feed water pump stops running; 3) The sampling equipment corresponds to the pressure regulation before and after the deoxygenated water supply main pipe, and the deoxygenated water supply bypass is led out in front of the deoxygenated water supply regulating valve group, and heat is exchanged through the high-temperature side of the sampling equipment, and connected to the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group by using a three-way valve. The pressure difference is fixed by the regulating valve as the main regulation, and the three-way valve is used as the auxiliary regulation to ensure that the pressure of the deoxygenated water supply bypass pipeline after the sampling equipment is significantly higher than the pressure of the deoxygenated water supply main pipe after the deoxygenated water supply regulating valve group, so as to promote the stable flow of deoxygenated water supply in the sampling equipment, thereby ensuring the normal operation of the sampling equipment; 4) Liquid level adjustment of the sewage well and the CDQ body circulating water tank. The continuous sewage, periodic sewage and drainage water of the CDQ boiler are separated by steam and water. The secondary steam is sent to the thermal deaerator to heat the deoxygenated feed water. The boiler sewage is connected to the sewage well; the boiler sewage is pressurized by the submerged sewage pump and sent to the multi-media filter to filter out some impurities. After heating the deoxygenated feed water through the water-to-water heat exchanger, it is divided into two paths. One path passes through the first electric shut-off valve and returns to the bottom of the sewage well. The other path passes through the second electric shut-off valve and is sent to the CDQ body circulating water tank; Among them, The long-axis submersible sewage pump and the sewage well liquid level recording instrument are interlocked. When the sewage well liquid level reaches the lowest limit value, the long-axis submersible sewage pump stops running; the first electric cut-off valve, the second electric cut-off valve and the circulating water tank liquid level recording instrument are interlocked. When the circulating water tank liquid level reaches the low limit value, the second electric cut-off valve opens and the first electric cut-off valve closes; when the circulating water tank liquid level reaches the high limit value, the second electric cut-off valve closes and the first electric cut-off valve opens; when the sewage well liquid level is higher than the bottom of the overflow pipe, the sewage flows by gravity into the external drainage pipeline.

9. The method for regulating a deoxygenation water supply system for CDQ waste heat power generation according to claim 8, characterized in that: The front and rear pressure difference of the deoxygenation water supply regulating valve group is 0.3-0.5MPa.

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