Dry quenching waste heat power generation deoxygenization water supply system

Abstract

The utility model 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. 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 utility model 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 utility model belongs to the dry quenching waste heat power generation technical field especially relates to a dry quenching waste heat power generation oxygen removal feedwater system. BACKGROUND

[0002] The oxygen removal feedwater system is an important component unit in the dry quenching waste heat power generation system. The current dry quenching oxygen removal feedwater system process is basically as follows: the secondary desalted water produced by the EDI electric desalting equipment of the desalted water station is first introduced into the desalted water tank of the desalted water station, and then is sent to the desalted water tank of the dry quenching boiler feedwater pump station by the secondary desalted water pump after being pressurized, at the same time, the dry quenching power condensate is also sent to the desalted water tank of the dry quenching boiler feedwater pump station by the condensate pump; the outlet water of the desalted water tank of the dry quenching boiler feedwater pump station is pressurized by the oxygen removal feedwater pump, and is sent to the thermal deaerator after passing through the feedwater 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 all need to be supplied by external low-pressure steam.

[0003] However, the industrial land is increasingly tight, and the project cost control is also increasingly fine management. As can be seen from the above process, the oxygen removal feedwater system contains both the desalted water tank of the desalted water station and the desalted water tank of the dry quenching boiler feedwater pump station, which not only increases the industrial land, but also increases the project cost.

[0004] The cooling method of the existing dry quenching boiler sampling equipment is to introduce a branch pipe from the oxygen removal feedwater main pipe to connect the cooling water feed pipe of the high-temperature and high-pressure frame cooler in the sampling equipment; the cooling water after passing through the high-temperature and high-pressure frame cooler is returned to the oxygen removal feedwater main pipe downstream of the introduction point, and the return connection is in a diagonal connection mode to reduce the resistance of the cooling water return; a throttling valve is arranged on the oxygen removal feedwater main pipe between the introduction point and the return connection point, and the throttling valve opening degree is adjusted according to the cooling water feed inlet pressure of the high-temperature and high-pressure frame cooler to control the flow of the cooling water feed and the pressure after the throttling valve to ensure the flow pressure of the cooling water in the high-temperature and high-pressure frame cooler and the unobstructed flow of the cooling water return. However, in the actual operation process, only adjusting the throttling valve opening degree cannot accurately control the pressure after the throttling valve, thereby affecting the stable flow of the deoxygenated water into the sampling equipment, causing the sampling water temperature to be too high, and seriously affecting the normal operation of the sampling equipment.

[0005] The continuous blowdown water of the current dry quenching boiler is basically expanded in the continuous blowdown expander, introduced into the periodic blowdown expander and periodic blowdown water collection, and then merged into the boiler blowdown water main pipe to flow into the blowdown well, but the dry quenching boiler blowdown water temperature is basically around 95 DEG C, which has high energy quality, and is directly sent to the blowdown well for discharge, which on the one hand causes the waste of water resources and energy; on the other hand, the blowdown well also produces "white smoke", which has an adverse effect on the drainage system and the environment. INVENTION CONTENTS

[0006] The utility model discloses a dry quenching waste heat power generation oxygen removal feedwater system, overcome the prior art's insufficient, first through the optimization system, save the desalted water station desalted water tank and secondary desalted water pump, reduce the land occupation, investment and operation, maintenance cost, second, the oxygen removal feedwater bypass of sampling equipment access is arranged at the both sides of oxygen removal feedwater regulating valve group, and utilizes the tee valve to connect the oxygen removal feedwater bypass export to the oxygen removal feedwater main pipe, and through the regulating valve fixed pressure difference as main adjustment, the tee valve as vice adjustment, guarantee the normal operation of sampling equipment, third, dry quenching boiler continuous blowdown water, regular blowdown water and boiler blowdown water all carry out steam water separation, and after secondary steam collection, send to the heating feedwater of thermal deaerator, and the drainage is heated oxygen removal feedwater through water water heat exchanger, so that can make full use of boiler blowdown water heat, can also eliminate the adverse effect of " white smoke " produced by blowdown to drainage system and environment.

[0007] In order to realize the above object, the utility model discloses the following technical scheme:

[0008] A dry quenching waste heat power generation oxygen removal feedwater system, including EDI electric desalting equipment, steam condensing type steam turbine or pure condensing type steam turbine, condenser, condensate pump, dry quenching boiler feedwater pump station desalted water tank, oxygen removal feedwater pump, oxygen removal feedwater regulating valve group, tee valve, water water heat exchanger, feedwater preheater and thermal deaerator, the top of dry quenching boiler feedwater pump station desalted water tank is equipped with at least two inlets, including secondary desalted water inlet and condensate water inlet, the secondary desalted water inlet is connected through desalted water regulating valve group and EDI electric desalting equipment outlet, the condensate water inlet is connected through condensate pump and condenser outlet,

[0009] The bottom of dry quenching boiler feedwater pump station desalted water tank is equipped with an outlet, and the inlet of oxygen removal feedwater pump is connected through pipeline,

[0010] The outlet of oxygen removal feedwater pump is connected with oxygen removal feedwater regulating valve group, tee valve, water water heat exchanger, feedwater preheater in proper order through oxygen removal feedwater main pipe, and is connected to the oxygen removal feedwater inlet of thermal deaerator finally, the tee valve is combined flow valve, and its inlet one is connected with oxygen removal feedwater regulating valve group, and its outlet is connected with water water heat exchanger.

[0011] Further, still include sampling equipment, the sampling equipment high temperature side cooling water inlet is connected with a branch pipe from the oxygen removal feedwater main pipe before oxygen removal feedwater regulating valve group, and high temperature side cooling water outlet pipeline is connected with tee valve inlet two.

[0012] Further, it also includes continuous blowdown expander, periodic blowdown expander, steam expansion vessel, blowdown well, submersible blowdown pump, multi-medium filter and dry quenching 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 arranged on the pipeline; the steam outlet at the bottom of the continuous blowdown expander is connected to the steam inlet of the periodic blowdown expander through a pipeline; the blowdown water outlet at the bottom of the continuous blowdown expander is connected to the first boiler blowdown water pipeline through a pipeline, and the blowdown water is sent to the bottom of the blowdown well;

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

[0014] the steam expansion vessel is connected to the steam outlet pipe of the dry quenching boiler through a plurality of inlets at the top, and the secondary steam outlet at the top is connected to the secondary steam main pipe through a pipeline, and a third check valve is arranged on the pipeline; the blowdown water outlet at the bottom of the steam expansion vessel is connected to the first boiler blowdown water pipeline through a pipeline, and the blowdown water is sent to the bottom of the blowdown well;

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

[0016] the hot end inlet of the water-water heat exchanger is connected to the outlet of the multi-medium filter through a pipeline; the hot end outlet of the water-water heat exchanger is divided into two paths, one path is connected to the bottom of the blowdown well through a first electric cut-off valve and a pipeline, and the other path is connected to the inlet of the dry quenching body circulating water tank through a second electric cut-off valve and a pipeline.

[0017] Further, the hot end inlet of the feedwater preheater is 160-170℃ circulating gas, and the hot end outlet is about 130℃ circulating gas.

[0018] Further, 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 inlet of the boiler feedwater pump through a pipeline.

[0019] Further, a retaining wall is arranged at the bottom of the blowdown well, the height of the retaining wall is 0.3-0.5 times the depth of the blowdown well, the first boiler blowdown water pipeline and the pipeline after the first electric cut-off valve are arranged on one side of the retaining wall of the blowdown well, and the end of the pipeline is higher than the bottom of the blowdown well by 200-400mm, the suction inlet of the submersible blowdown pump and the blowdown well liquid level recorder are arranged on the other side of the retaining wall of the blowdown well, the suction inlet of the submersible blowdown pump is higher than the bottom of the blowdown well by 200-400mm, and the center of the overflow pipe is lower than the top of the blowdown well by 300-1000mm.

[0020] Further, the filter material of the multi-medium filter comprises anthracite and quartz sand, and the material of the multi-medium filter cylinder and internal components is S30408 stainless steel or carbon steel lined with rubber with a temperature resistance of 100 DEG C.

[0021] Compared with the prior art, the utility model has the beneficial effects that:

[0022] 1) The salted water supply part in the deoxygenated feed water system is optimized, that is, the secondary salted water at the outlet of the EDI electric desalting equipment directly enters the salted water tank of the dry quenching boiler feed water pump station through the salted water adjusting valve group, so that the salted water tank and the secondary salted water pump of the salted water station are omitted, and the land occupation, investment and operation and maintenance costs are reduced;

[0023] 2) The deoxygenated feed water bypass joint position entering the sampling equipment is rearranged and arranged on the two sides of the deoxygenated feed water adjusting valve group, and the three-way valve is used to connect the deoxygenated feed water bypass outlet to the deoxygenated feed water mother pipe, the fixed pressure difference of the adjusting valve is used as the main adjustment, the three-way valve is used as the secondary adjustment, the pressure of the deoxygenated feed water bypass pipeline after the sampling equipment is ensured to be significantly higher than the pressure of the deoxygenated feed water mother pipe after the deoxygenated feed water adjusting valve group, the deoxygenated feed water is promoted to flow stably in the sampling equipment, and then the normal operation of the sampling equipment is ensured;

[0024] 3) The boiler blowdown and the blowoff water are respectively subjected to steam-water separation, the secondary steam is sent into the thermal deaerator to heat the deoxygenated feed water, part of the blowdown water after the water-water heat exchanger is used to heat the deoxygenated feed water is sent into the dry quenching body circulating water tank for normal production, and the other part is sent into the blowdown well again to reduce the temperature of the blowdown water in the blowdown well, which not only can fully utilize the heat and water resources of the boiler blowdown and the blowoff water, but also can eliminate the adverse effects of the "white smoke" generated by the blowdown on the drainage system and the environment;

[0025] 4) The salted water adjusting valve group, the deoxygenated feed water adjusting valve group, the salted water tank liquid level recording control instrument, the blowdown well liquid level recording instrument, the deaerator liquid level recording control instrument, the circulating water tank liquid level recording instrument, the first electric cut-off valve and the second electric cut-off valve are arranged, and the normal work of the dry quenching boiler feed water pump station salted water tank, the thermal deaerator, the blowdown well, the dry quenching body circulating water tank, the deoxygenated feed water pump, the boiler feed water pump and the long shaft submersible blowdown pump in the deoxygenated feed water system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model embodiment.

[0027] In the figure: 1-EDI electric desalting equipment, 2-secondary desalting water pipeline, 3-desalting water regulating valve group, 4-steam condensing turbine or pure condensing turbine, 5-condenser, 6-condensate pump, 7-condensate pipeline, 8-dry quenching boiler feed water pump station desalting water tank, 9-desalting water tank liquid level recording control instrument, 10-deaerating feed water pump, 11-deaerating feed water main pipe, 12-deaerating 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-dry quenching boiler feed water pump, 19-continuous blowdown expander, 20-periodic blowdown expander, 21-drainage expander, 22-first boiler blowdown water pipeline, 23-blowdown well, 24-long shaft submersible blowdown pump, 25-second boiler blowdown water pipeline, 26-multi-medium filter, 27-first electrically-operated cut-off valve, 28-second electrically-operated cut-off valve, 29-blowdown 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-dry quenching body circulating water tank, 36-circulating water tank liquid level recording instrument. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings described below are only some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings, and other implementation manners can also be obtained.

[0029] In order to make the drawing simple, only the parts related to the present application are shown in the drawing, which do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, only one of the parts with the same structure or function is shown in some drawings, or only one of them is marked.

[0030] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0031] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0032] In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0033] In order to more clearly illustrate the specific embodiment of the utility model or the technical solution in the prior art, the specific examples required in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the specific examples in the following description are some embodiments of the utility model, and other specific examples can also be obtained by those skilled in the art without creative labor on the basis of these specific examples.

[0034] See Figure 1 It is an embodiment structure schematic diagram of the oxygen removal feedwater system of the dry quenching waste heat power generation of the utility model, including EDI electric desalination equipment 1, steam extraction condensing steam turbine or pure condensing steam turbine 4, condenser 5, condensate pump 6, dry quenching boiler feedwater pump station desalination water tank 8, oxygen removal feedwater pump 10, oxygen removal feedwater regulating valve group 12, three-way valve 13, water-water heat exchanger 15, feedwater preheater 16 and thermal deaerator 17.

[0035] The dry quenching boiler feedwater pump station desalination water tank 8 is provided with at least two inlets at the top, including a secondary desalination water inlet and a condensate water inlet, the secondary desalination water inlet is connected through a secondary desalination water pipeline 2, a desalination water regulating valve group 3 and an outlet of the EDI electric desalination equipment 1, and the condensate water inlet is connected through a condensate pump 6, a condensate water pipeline 7 and an outlet of the condenser 5.

[0036] The dry quenching boiler feedwater pump station desalination water tank 8 is provided with at least two inlets at the top, including a secondary desalination water inlet and a condensate water inlet, the secondary desalination water inlet is connected through a secondary desalination water pipeline 2, a desalination water regulating valve group 3 and an outlet of the EDI electric desalination equipment 1, and the condensate water inlet is connected through a condensate pump 6, a condensate water pipeline 7 and an outlet of the condenser 5.

[0037] The outlet of the oxygen removal feedwater pump 10 is connected with the oxygen removal feedwater regulating valve group 12, the three-way valve 13, the water-water heat exchanger 15 and the feedwater preheater 16 in sequence through the oxygen removal feedwater mother pipe 11, and finally connected to the oxygen removal feedwater inlet of the thermal deaerator 17. The three-way valve 13 is a converging valve, the inlet one is connected with the oxygen removal feedwater regulating valve group 12, the inlet two is connected with the sampling equipment 14, and the outlet is connected with the water-water heat exchanger 15.

[0038] The desalinated 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 pipeline includes a cut-off valve.

[0039] The system further includes a sampling device 14, and a high-temperature side cooling water inlet of the sampling device 14 is connected to a branch pipeline from the deaerated feedwater main pipe 11 before the deaerated feedwater regulating valve group 12.

[0040] The system further includes a continuous blowdown expander 19, a periodic blowdown expander 20, a blowdown flash tank 21, a blowdown well 23, a submerse blowdown pump 24, a multi-medium filter 26 and a dry quenching body circulating water tank 35. 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 blowdown water outlet at the bottom of the continuous blowdown expander 19 is connected to the blowdown water inlet of the periodic blowdown expander 20 through a pipeline; and the blowdown water outlet at the bottom of the continuous blowdown expander 19 is connected to the first boiler blowdown water pipeline 22 through a pipeline and is sent to the bottom of the blowdown well 23.

[0041] The secondary steam outlet at the top of the periodic blowdown expander 20 is connected to the secondary steam main pipe 33 through a pipeline, and a second check valve 31 is arranged on the pipeline; and the blowdown water outlet at the bottom of the periodic blowdown expander 20 is connected to the first boiler blowdown water pipeline 22 through a pipeline and is sent to the bottom of the blowdown well 23.

[0042] The blowdown flash tank 21 is connected to the dry quenching boiler blowdown water pipeline through a plurality of inlets at the top, the secondary steam outlet at the top is connected to the secondary steam main pipe 33 through a pipeline, and a third check valve 32 is arranged on the pipeline; and the blowdown water outlet at the bottom of the blowdown flash tank 21 is connected to the first boiler blowdown water pipeline 22 through a pipeline and is sent to the bottom of the blowdown well 23.

[0043] A retaining wall is arranged at the bottom of the blowdown well 23, the height of the retaining wall is 0.3-0.5 times the depth of the blowdown well, the first boiler blowdown water pipeline 22 and the pipeline after the first electric cut-off valve 27 are arranged on one side of the retaining wall of the blowdown well 23, and the end of the pipeline is higher than the bottom of the blowdown well by 200-400 mm, the suction inlet of the submerse blowdown pump 24 and a blowdown well liquid level recording instrument 29 are arranged on the other side of the retaining wall of the blowdown well 23, the suction inlet of the submerse blowdown pump 24 is higher than the bottom of the blowdown well 23 by 200-400 mm, and the center of the overflow pipe is lower than the top of the blowdown well 23 by 300-1000 mm. The suction inlet of the submerse blowdown pump 24 is arranged at the bottom of the blowdown well 23; and the outlet of the submerse blowdown pump 24 is connected to the inlet of the multi-medium filter 26 through the second boiler blowdown water pipeline 25.

[0044] The water-water heat exchanger 15 hot end inlet is connected with the multi-medium filter 26 outlet through a pipeline; the water-water heat exchanger 15 hot end outlet is divided into two routes, one route is connected to the bottom of the blowdown well 23 through a first electric cut-off valve 27 and a pipeline, and the other route is connected to the dry quenching body circulating water tank 35 inlet through a second electric cut-off valve 28 and a pipeline. The water-water heat exchanger 15 is a tubular heat exchanger or a plate heat exchanger.

[0045] The water-water heat exchanger 15 hot end inlet is connected with the multi-medium filter 26 outlet through a pipeline; the water-water heat exchanger 15 hot end outlet is divided into two routes, one route is connected to the bottom of the blowdown well 23 through a first electric cut-off valve 27 and a pipeline, and the other route is connected to the dry quenching body circulating water tank 35 inlet through a second electric cut-off valve 28 and a pipeline. The water-water heat exchanger 15 is a tubular heat exchanger or a plate heat exchanger.

[0046] The thermal deaerator 17 secondary steam inlet is connected with the secondary steam main pipe 33, and the thermal deaerator 17 water outlet is connected with the boiler feed water pump 18 inlet through a pipeline.

[0047] The filter material of the multi-medium filter 26 includes anthracite and quartz sand, and the cylinder body and internal components of the multi-medium filter 26 are made of S30408 stainless steel or carbon steel lined with rubber.

[0048] The working steps of the dry quenching waste heat power generation deaerating feed water system embodiment are as follows:

[0049] 1) The desalted water tank liquid level is adjusted, the secondary desalted water of the EDI electric desalting equipment 1 outlet is sent into the dry quenching boiler feed water pump station desalted water tank 8 through the desalted water adjusting valve group 3, the desalted water adjusting valve group 3 adjusts the valve opening degree according to the desalted water tank liquid level record control instrument 9, and the liquid level of the dry quenching boiler feed water pump station desalted water tank 8 is maintained at a set value; the exhaust steam of the extraction condensing steam turbine or pure condensing steam turbine 4 is changed into condensed water after heat exchange with the circulating cooling water in the condenser 5, and is sent into the dry quenching boiler feed water pump station desalted water tank 8 and mixed with the secondary desalted water through the condensed water pump 6, so as to be used as the source of deaerating feed water;

[0050] 2) The deaerator liquid level is adjusted, the deaerating feed water of the dry quenching boiler feed water pump station desalted water tank 8 outlet is pressurized by the deaerating feed water pump 10, and sequentially passes through the deaerating feed water adjusting valve group 12, the three-way valve 13, the water-water heat exchanger 15, the feed water preheater 16 and the thermal deaerator 17, and is sent to the boiler feed water pump 18 after qualified deaerating feed water is obtained through the thermal deaeration; wherein the deaerating feed water pump 10 and the desalted water tank liquid level record control instrument 9 are interlocked, when the desalted water tank liquid level reaches the minimum limit value, the deaerating feed water pump 10 stops running, the deaerating feed water adjusting valve 12 group adjusts the valve opening degree according to the deaerator liquid level record control instrument 34, and the liquid level of the thermal deaerator 17 is maintained at a set value, the boiler feed water pump 18 and the deaerator liquid level record control instrument 34 are interlocked, and when the liquid level of the thermal deaerator 17 reaches the minimum limit value, the boiler feed water pump 18 stops running;

[0051] 3) The sampling device corresponds to the pressure adjustment of the oxygenated feedwater main pipe before and after, the oxygenated feedwater bypass is led out before the oxygenated feedwater regulating valve group 12, passes through the high-temperature side heat exchange of the sampling device 14, and is connected to the oxygenated feedwater main pipe 11 after the oxygenated feedwater regulating valve group 12 through the three-way valve 13, the fixed pressure difference of the regulating valve is used as the main adjustment, the pressure difference before and after the oxygenated feedwater regulating valve group is 0.3-0.5 MPa, the three-way valve 13 is used as the secondary adjustment, the pressure of the oxygenated feedwater bypass pipe after the sampling device 14 is significantly higher than the pressure of the oxygenated feedwater main pipe 11 after the oxygenated feedwater regulating valve group 12, the oxygenated feedwater is stably flowed in the sampling device 14, and then the normal operation of the sampling device 14 is ensured.

[0052] 4) The liquid level of the blowdown well and the dry quenching body circulating water tank is adjusted, the continuous blowdown water, the periodic blowdown water and the blowdown water of the dry quenching boiler pass through steam-water separation, the secondary steam is sent into the thermal deaerator 17 to heat the deaerated feedwater, and the boiler blowdown water is connected to the blowdown well 23; the boiler blowdown water is pressurized through the subsea blowdown pump 24, is filtered through the multi-medium filter 26, is heated through the water-water heat exchanger 15 after the deaerated feedwater, is divided into two ways, one way returns to the bottom of the blowdown well 23 through the first electric cut-off valve 27, and the other way is sent to the dry quenching body circulating water tank 35 through the second electric cut-off valve 28; wherein the long shaft subsea blowdown pump 24 and the blowdown well liquid level recorder 29 are interlocked, when the blowdown well liquid level reaches the minimum limit value, the long shaft subsea blowdown 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 recorder 36 are interlocked, when the circulating water tank liquid level reaches the low limit value, the second electric cut-off valve 28 is opened, and the first electric cut-off valve 27 is closed; when the circulating water tank liquid level reaches the high limit value, the second electric cut-off valve 28 is closed, and the first electric cut-off valve 27 is opened; when the blowdown well liquid level is higher than the bottom of the overflow pipe, the blowdown water is self-flowed into the external drain pipeline.

[0053] In the embodiment of the utility model, the deaerated feedwater system is supplied with the salt water, the outlet secondary deaerated water of EDI electric deionization equipment 1 directly enters the dry quenching boiler feedwater pump station deaerated water tank 8 after the deaerated water regulating valve group, the deaerated water tank and the secondary deaerated water pump of the deaerated water station are omitted, and the cost is reduced.

[0054] The oxygenated feedwater bypass joint position into the sampling device 14 is arranged on both sides of the oxygenated feedwater regulating valve group 12, the fixed pressure difference of the regulating valve is used as the main adjustment, the three-way valve 13 is used as the secondary adjustment, the pressure of the oxygenated feedwater bypass pipe after the sampling device 14 is significantly higher than the pressure of the oxygenated feedwater main pipe after the oxygenated feedwater regulating valve group 12, the oxygenated feedwater is stably flowed in the sampling device, and then the normal operation of the sampling device is ensured.

[0055] The boiler blowdown and blow-off water are respectively subjected to steam-water separation, the secondary steam is sent into the thermal deaerator 17 to heat the deaerated feed water, the blowdown water is heated by the water-water heat exchanger 15 to heat the deaerated feed water, and then a part of the blowdown water is sent into the dry quenching body circulating water tank 35 for normal production, and another part of the blowdown water is sent into the blowdown well 23 again to reduce the temperature of the blowdown water in the blowdown well, which can not only make full use of the heat and water resources of the boiler blowdown and blow-off water, but also eliminate the adverse effects of the "white smoke" generated by the blowdown on the drainage system and the environment.

[0056] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A coke dry quenching cogeneration deaerating feed water system, characterized by, The EDI electric desalination device, the extraction condensing steam turbine or pure condensing steam turbine, the condenser, the condensate pump, the dry quenching coke boiler feed water pump station desalination tank, the deaerated feed water pump, the deaerated feed water regulating valve group, the three-way valve, the water-water heat exchanger, the feed water preheater and the thermal deaerator are included. The top of the dry quenching coke boiler feed water pump station desalination tank is provided with at least two inlets, including a secondary desalination water inlet and a condensate water inlet. The bottom of the dry quenching coke boiler feed water pump station desalination tank is provided with an outlet connected with the inlet of the deaerated feed water pump through a pipeline. The outlet of the deaerated feed water pump is connected with the deaerated feed water regulating valve group, the three-way valve, the water-water heat exchanger, the feed water preheater and the thermal deaerator in sequence through a pipeline.

2. The oxygenated feedwater system for a coke dry quenching waste heat power generation system according to claim 1, characterized by The three-way valve is a combined valve, the inlet one of which is connected with the deaerated feed water regulating valve group, and the outlet of which is connected with the water-water heat exchanger.

3. The oxygenated feedwater system for a coke dry quenching waste heat power generation according to claim 1, characterized by The sampling device is connected with a branch pipeline of the deaerated feed water mother pipeline before the deaerated feed water regulating valve group through the high-temperature side cooling water inlet, and the high-temperature side cooling water outlet pipeline is connected with the inlet two of the three-way valve. The continuous blowdown expander, the periodic blowdown expander, the drain expander, the blowdown well, the submersible blowdown pump, the multi-medium filter and the dry quenching coke body circulating water tank are further included. The secondary steam outlet at the top of the continuous blowdown expander is connected with the secondary steam mother pipeline through a pipeline, and a first check valve is arranged on the pipeline. The drain outlet at the bottom of the continuous blowdown expander is connected with the drain inlet of the periodic blowdown expander through a pipeline. The drain outlet at the bottom of the continuous blowdown expander is connected with the first boiler blowdown water pipeline through a pipeline, and is sent to the bottom of the blowdown well. The submersible blowdown pump suction inlet is arranged at the bottom of the blowdown well.

4. The oxygenated feedwater system for a coke dry quenching waste heat power generation according to claim 1, characterized by The water-water heat exchanger hot end inlet is connected with the multi-medium filter outlet through a pipeline.

5. The oxygenated feedwater system for a coke dry quenching waste heat power generation according to claim 3, characterized by The feed water preheater hot end inlet is 160-170 ℃ circulating gas, and the hot end outlet is about 130 ℃ circulating gas. The secondary steam inlet of the thermal deaerator is connected with the secondary steam mother pipeline, and the outlet of the thermal deaerator is connected with the inlet of the boiler feed water pump through a pipeline.

6. The oxygenated feedwater system for a coke dry quenching waste heat power generation system according to claim 5, characterized by The bottom of the blowdown well is provided with a retaining wall, the height of the retaining wall is 0.3-0.5 times the depth of the blowdown well, the first boiler blowdown water pipeline and the pipeline after the first electric cut-off valve are arranged on one side of the retaining wall of the blowdown well, and the end of the pipeline is higher than the bottom of the blowdown well by 200-400 mm, the suction inlet of the submersible blowdown pump and the blowdown well liquid level recording instrument are arranged on the other side of the retaining wall of the blowdown well, the suction inlet of the submersible blowdown pump is higher than the bottom of the blowdown well by 200-400 mm, and the center of the overflow pipe is lower than the top of the blowdown well by 300-1000 mm.

7. The oxygenated feedwater system for a coke dry quenching waste heat power generation system according to claim 6, characterized by The filter material of the multi-medium filter comprises anthracite and quartz sand, and the material of the cylinder and internal components of the multi-medium filter is S30408 stainless steel or temperature-resistant 100 DEG C carbon steel lined with rubber.

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