Condensed water heating device

Abstract

According to the condensed water heating device, the heat pump is arranged to utilize heat in circulating cooling water after heat exchange with steam in the condenser, low-grade heat in the circulating cooling water is converted into high-grade heat, and the generated high-grade heat and condensed water output by the condenser are subjected to heat exchange in the heat exchanger; the condensed water is preheated and then input into a deaerator to be deoxygenated, and then the deoxygenated and heated condensed water is heated to the preset temperature through a heater and then introduced into a boiler to be recycled. According to the device, through the arrangement of the heat pump, heat in circulating cooling water is recycled to be used for heating steam condensation water, and the defects that in a traditional condensation water system, due to the fact that the supercooling degree of the condensation water is too large, boiler fuel consumption is too high, and the oxygen content in the condensation water is too high, and a pipeline is prone to being corroded are overcome. In addition, heat in circulating water can be utilized by arranging the heat pump, and the advantage of saving energy is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal power generation technology, in particular to a condensate heating device. BACKGROUND

[0002] The condenser is one of the important auxiliary equipment of the condensing steam turbine, and its functions are as follows: first, to establish and maintain a specified vacuum at the exhaust port of the condenser, so that the steam expands to the lowest pressure in the steam turbine, increases the available enthalpy drop of the steam in the steam turbine, and improves the cycle thermal efficiency of the steam turbine; second, to condense the exhaust steam of the steam turbine into clean condensate water and remove oxygen through preliminary vacuum; third, to collect various drainages and reduce steam and water loss.

[0003] The working performance of the condenser directly affects the thermal economy and safety of the entire condensing steam turbine unit. The performance of the condenser is reflected in whether it can maintain the best vacuum, whether the supercooling degree of the condensate water is minimal, and whether the quality of the condensate water is qualified. The greater the supercooling degree of the condensate water, the more heat is taken away by the circulating cooling water, and the more fuel needs to be consumed by the boiler to make up for this part of heat loss, resulting in a decrease in system economy. At the same time, the greater the supercooling degree, the greater the oxygen content in the condensate water, which accelerates the corrosion of related pipelines and equipment. CONTENT OF THE INVENTION

[0004] The present application provides a condensate heating device to solve the problems of high fuel consumption of the boiler and high oxygen content in the condensate water due to large supercooling degree of the condensate water.

[0005] The present application provides a condensate heating device, comprising a condenser, a heat exchange medium input end of the condenser being connected with a circulating water supply pipeline, and a heat exchange medium output end of the condenser being connected with a heat pump;

[0006] The condenser is further connected with a heat exchanger, a deaerator, a heater and a boiler in sequence;

[0007] The heat pump is further connected with the heat exchanger;

[0008] The condenser is further connected with a steam turbine.

[0009] Optionally, a mixer is arranged between the condenser and the heat exchanger;

[0010] An extraction port is arranged on the condenser, and the extraction port is connected with the mixer through a compressor.

[0011] Optionally, a steam output end of the deaerator is connected with a shell side of a condenser;

[0012] A tube side input end of the condenser is connected with a demineralized water supply pipeline, and a tube side output end of the condenser is connected with the deaerator;

[0013] The shell side of the condenser is also connected with a condensate storage tank, and the gas output end of the shell side of the condenser is connected with a steam treatment device.

[0014] Optionally, the desalted water supply pipeline is also connected with a makeup water tank.

[0015] The makeup water tank is connected with a condenser.

[0016] Optionally, the condensate storage tank is also connected with a reverse osmosis device.

[0017] The reverse osmosis device is also connected with the desalted water supply pipeline.

[0018] Optionally, the output end of the shell side of the heat exchanger is connected with a cooling tower.

[0019] The cooling tower is also connected with a circulating water supply pipeline.

[0020] Optionally, the mixer comprises a mixer body.

[0021] The mixer body is provided with a water inlet and an exhaust port at the top and a liquid outlet at the bottom.

[0022] The mixer body is provided with a gas distribution pipe, which comprises a plurality of branch pipes connected with the main pipe, and a plurality of gas distribution holes are formed in the branch pipes.

[0023] The condensate heating device provided by the application utilizes the heat in the circulating cooling water after heat exchange with steam in the condenser by setting a heat pump, converts the low-grade heat in the circulating cooling water into high-grade heat, and exchanges the generated high-grade heat with the condensate output by the condenser in a heat exchanger, preheats the condensate, and inputs the preheated condensate into a deaerator for deaeration, and then heats the deaerated and warmed condensate to a preset temperature by a heater and inputs the heated condensate into a boiler for recycling. The device of the application recovers the heat in the circulating cooling water by setting a heat pump to heat the steam condensate, overcomes the problems of high fuel consumption of the boiler and high oxygen content in the condensate which easily corrodes the pipeline due to the large supercooling degree of the condensate in the traditional condensate system. In addition, the heat in the circulating water can also be utilized by setting a heat pump, which has the advantage of saving energy. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The schematic diagram of the condensate heating device provided by an embodiment of the application.

[0026] Figure 2 A schematic diagram of a condensate heating device according to another embodiment of the present application is provided;

[0027] Figure 3 A schematic diagram of a condensate heating device according to another embodiment of the present application is provided;

[0028] Figure 4 A schematic diagram of a condensate heating device according to another embodiment of the present application is provided;

[0029] Figure 5 A schematic diagram of a condensate heating device according to another embodiment of the present application is provided;

[0030] Figure 6 A schematic diagram of a condensate heating device according to another embodiment of the present application is provided;

[0031] Figure 7 A schematic diagram of a mixer according to an embodiment of the present application is provided.

[0032] 1, condenser; 2, heat pump; 3, deaerator; 4, boiler; 5, cooling tower; 10, circulating water supply pipeline; 11, steam turbine; 12, make-up water tank; 20, demineralized water supply pipeline; 21, heat exchanger; 22, mixer; 23, compressor; 31, heater; 32, condenser; 33, condensate storage tank; 34, steam treatment device; 35, reverse osmosis device; 201, water inlet; 202, exhaust port; 203, liquid outlet; 221, mixer body; 222, air distribution pipe; 2221, main pipe; 2222, branch pipe. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0034] As shown in Figure 1 The present application provides a condensate heating device, which comprises a condenser 1, a heat exchanger 21, a deaerator 3, a heater 31 and a boiler 4 connected to the condenser 1 in sequence, and a heat pump 2 connected to the condenser 1.

[0035] The condenser 1 is further connected to the heat exchanger 21, the deaerator 3, the heater 31 and the boiler 4 in sequence.

[0036] The heat pump 2 is further connected to the heat exchanger 21.

[0037] Condenser 1 is also connected to steam turbine 11.

[0038] When in use, the steam output from the turbine 11 enters the condenser 1 and exchanges heat with the circulating cooling water supplied from the circulating water supply line 10. The steam condenses into condensate, while the temperature of the cooling circulating water rises.

[0039] The circulating water output from condenser 1 enters heat pump 2, where low-grade heat is converted into high-grade heat, and then output to heat exchanger 21 to exchange heat with the condensate output from condenser 1, further heating the condensate. The heated condensate then enters deaerator 3, where it is heated and deoxygenated using steam. After deoxygenation in deaerator 3, the condensate is fed into heater 31 for further heating before being fed into boiler 4 for use.

[0040] The condensate heating device provided in this application utilizes a heat pump 2 to extract heat from the circulating cooling water after heat exchange with steam in the condenser 1. This converts low-grade heat in the circulating cooling water into high-grade heat, which is then exchanged with the condensate output from the condenser 1 in a heat exchanger 21. The preheated condensate is then fed into a deaerator 3 for deoxygenation. Finally, the deaerated and heated condensate is heated to a preset temperature by a heater 31 before being fed into the boiler 4 for recycling. This device, by using the heat pump 2 to recover heat from the circulating cooling water for heating steam condensate, overcomes the drawbacks of traditional condensate systems, such as high boiler fuel consumption due to excessive condensate subcooling and corrosion of pipes due to high oxygen content in the condensate. Furthermore, the heat pump 2 also allows for the utilization of heat from the circulating water, resulting in energy savings.

[0041] like Figure 2 As shown, optionally, a mixer 22 is provided between the condenser 1 and the heat exchanger 21;

[0042] The condenser 1 is equipped with a steam extraction port, which is connected to the mixer 22 via the compressor 23.

[0043] In this application, when the condenser 1 is working, a portion of the steam is extracted by the compressor 23 through the steam extraction port at the top of the condenser 1 and pressurized and heated. The pressurized and heated steam enters the mixer 22 and mixes with the condensate output from the condenser 1. While the steam heats the condensate, the condensate absorbs the steam.

[0044] like Figure 3 As shown, optionally, the steam output end of the deaerator 3 is connected to the shell side of the condenser 32;

[0045] The tube-side inlet of condenser 32 is connected to the demineralized water supply line 20, and the tube-side outlet is connected to deaerator 3.

[0046] The shell side of the condenser 32 is also connected to the condensate storage tank 33, and the gas output end of the shell side of the condenser 32 is connected to the steam treatment device 34.

[0047] In this application, the steam discharged from the deaerator 3 after heating and deoxygenating the condensate still has a relatively high temperature (120-150°C). This steam is then drawn from the deaerator 3 and introduced into the condenser 32, where it is cooled by demineralized water supplied by the demineralized water supply line 20. During this process, the steam is condensed into a liquid, while the demineralized water is heated. The heated demineralized water is then returned to the deaerator 3 for further heating and deoxygenation. The condensate produced after steam condensation is temporarily stored in the condensate storage tank 33.

[0048] Non-condensable gases that fail to be condensed in condenser 32 (such as air mixed in with steam) are fed into steam treatment device 34 for absorption and other treatments before being released into the air.

[0049] like Figure 4 As shown, optionally, the demineralized water supply line 20 is also connected to the water supply tank 12;

[0050] The makeup water tank 12 is connected to the condenser 1.

[0051] In this application, during the use of the condenser 1, in order to maintain the water level in the condenser 1, water needs to be replenished to the condenser 1 in a timely manner. The replenishment water can not only maintain the water level in the condenser 1, but also help to cool the steam entering the condenser 1. At this time, the demineralized water supplied by the demineralized water supply pipeline 20 can be temporarily stored in the replenishment water tank 12, and then the condenser 1 can be replenished with water in a timely manner through the replenishment water tank 12.

[0052] like Figure 5 As shown, optionally, the condensate storage tank 33 is also connected to the reverse osmosis unit 35;

[0053] The reverse osmosis unit 35 is also connected to the demineralized water supply line 20.

[0054] In this application, the steam condensate temporarily stored in the condensate storage tank 33 is passed into the reverse osmosis unit 35 for membrane filtration purification to obtain demineralized water, which is then returned to the demineralized water supply line 20 for recycling. The reverse osmosis unit 35 consists of multiple reverse osmosis membrane modules connected in series.

[0055] like Figure 6 As shown, optionally, the shell-side output end of heat exchanger 21 is connected to cooling tower 5;

[0056] Cooling tower 5 is also connected to circulating water supply pipeline 10.

[0057] In the present application, the circulating hot water after heat exchange with the condensed water in the heat exchanger 21 is output from the heat exchanger 21 into the cooling tower 5 for cooling, and the cooled circulating water can be input into the circulating water supply pipeline 10 for recycling.

[0058] As shown in Figure 7 Optionally, the mixer 22 comprises a mixer body 221;

[0059] The mixer body 221 is provided with a water inlet 201 and an exhaust port 202 at the top, and a liquid outlet 203 at the bottom.

[0060] The mixer body 221 is provided with a gas distribution pipe 222, which comprises a plurality of branch pipes 2222 connected to the main pipe 2221, and a plurality of gas distribution holes are formed in the branch pipes 2222.

[0061] In use, the steam output by the compressor 23 enters the main pipe 2221 of the gas distribution pipe 222 and is distributed to the branch pipes 2222, and is discharged from the gas distribution holes in the branch pipes 2222 to contact and mix with the condensed water input through the water inlet 201. The steam heats the condensed water, while the condensed water absorbs the steam, and the non-condensable gas mixed in the steam is discharged from the exhaust port 202.

[0062] A condensed water heating device, the use process is as follows:

[0063] In use, the steam output by the turbine 11 enters the condenser 1 to exchange heat with the circulating cooling water supplied from the circulating water supply pipeline 10, and the steam condenses into condensed water, while the temperature of the cooling circulating water increases. At the same time, a part of the steam is extracted by the compressor 23 through the steam extraction port at the upper part of the condenser 1, and is pressurized and heated. The pressurized and heated steam enters the mixer 22 to mix with the condensed water output from the condenser 1. In the mixer 22, the steam output by the compressor 23 enters the main pipe 2221 of the gas distribution pipe 222 and is distributed to the branch pipes 2222, and is discharged from the gas distribution holes in the branch pipes 2222 to contact and mix with the condensed water input through the water inlet 201. The steam heats the condensed water, while the condensed water absorbs the steam, and the non-condensable gas mixed in the steam is discharged from the exhaust port 202.

[0064] The circulating water output from the condenser 1 enters the heat pump 2 to convert the low-grade heat therein into high-grade heat, and is output to the heat exchanger 21 to exchange heat with the condensed water output from the mixer 22, to further heat the condensed water. The heated condensed water enters the deaerator 3 to be heated and deaerated by steam. The circulating hot water after heat exchange with the condensed water in the heat exchanger 21 is output from the heat exchanger 21 into the cooling tower 5 for cooling, and the cooled circulating water can be input into the circulating water supply pipeline 10 for recycling.

[0065] The condensed water after deaeration in the deaerator 3 is input into the heater 31 to be heated, and then input into the boiler 4 to be used.

[0066] The steam after deaeration of the condensed water in the deaerator 3 is still high in temperature (120-150℃), at this time, the steam is led out from the deaerator 3 and input into the condenser 32 to be cooled by the desalted water supplied by the desalted water supply pipeline 20, in this process, the steam is condensed into liquid, and the desalted water is heated, the heated desalted water is returned to the deaerator 3 to be heated and deaerated. The condensed water produced by the condensation of the steam is temporarily stored in the condensed water storage tank 33 and input into the reverse osmosis device 35 to be purified by membrane filtration to obtain desalted water, and then the desalted water is returned to the desalted water supply pipeline 20 to be recycled.

[0067] The non-condensable gas in the condenser 32 that cannot be condensed is input into the steam treatment device 34 to be treated by absorption, etc. and then vented.

[0068] During the use of the condenser 1, water needs to be supplied to the condenser 1 in time to maintain the water level in the condenser 1, the water supply not only maintains the water level in the condenser 1, but also assists in cooling the steam entering the condenser 1, at this time, the desalted water provided by the desalted water supply pipeline 20 is temporarily stored in the water supply tank 12, and then the water supply tank 12 is used to supply water to the condenser 1 in time.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A condensate heating device, characterized in that, It includes a condenser (1), the heat exchange medium input end of the condenser (1) is connected to the circulating water supply pipeline (10), and the heat exchange medium output end of the condenser (1) is connected to the heat pump (2). The condenser (1) is also connected in sequence to the heat exchanger (21), the deaerator (3), the heater (31) and the boiler (4); The heat pump (2) is also connected to the heat exchanger (21); The condenser (1) is also connected to the steam turbine (11).

2. The condensate heating device according to claim 1, characterized in that, A mixer (22) is provided between the condenser (1) and the heat exchanger (21); The condenser (1) is provided with a steam extraction port, which is connected to the mixer (22) via a compressor (23).

3. The condensate heating device according to claim 1, characterized in that, The steam output end of the deaerator (3) is connected to the shell side of the condenser (32); The tube-side input end of the condenser (32) is connected to the demineralized water supply line (20), and the tube-side output end is connected to the deaerator (3). The shell side of the condenser (32) is also connected to the condensate storage tank (33), and the gas output end of the shell side of the condenser (32) is connected to the steam treatment device (34).

4. The condensate heating device according to claim 3, characterized in that, The demineralized water supply pipeline (20) is also connected to the water replenishment tank (12); The water supply tank (12) is connected to the condenser (1).

5. The condensate heating device according to claim 3, characterized in that, The condensate storage tank (33) is also connected to the reverse osmosis unit (35); The reverse osmosis unit (35) is also connected to the demineralized water supply line (20).

6. The condensate heating device according to claim 1, characterized in that, The shell-side output end of the heat exchanger (21) is connected to the cooling tower (5); The cooling tower (5) is also connected to the circulating water supply pipeline (10).

7. The condensate heating device according to claim 2, characterized in that, The mixer (22) includes a mixer body (221); The mixer body (221) has a water inlet (201) and an exhaust port (202) at the top, and a liquid outlet (203) at the bottom; The mixer body (221) is provided with an air distribution pipe (222), which includes multiple branch pipes (2222) connected in parallel with the main pipe (2221), and multiple air distribution holes are provided on the branch pipes (2222).

Images