Water supply system of waste heat boiler of heat supply unit of combustion engine

Abstract

The application provides a water feeding system of a waste heat boiler of a gas turbine heat supply unit, comprising: a heat supply water supplement pipeline, a boiler water feeding pipeline and a unit water supplement pipeline, output ends of the heat supply water supplement pipeline are communicated with the boiler water feeding pipeline and the unit water supplement pipeline respectively; the boiler water feeding pipeline and the unit water supplement pipeline are coupled to a boiler steam-water system respectively; a heat supply water supplement pump is arranged on the heat supply water supplement pipeline, and the heat supply water supplement pump is used for providing water feeding power and water supplement power to the boiler water feeding pipeline and the unit water supplement pipeline respectively. The heat supply water supplement pump of the gas turbine heat supply unit is used for setting pipelines for feeding water to high-pressure, medium-pressure and low-pressure systems of the boiler at the outlet of the pump, and water feeding can be quickly, conveniently and energy-savingly completed by switching valves, so that initial investment and operation energy consumption are reduced, operation is more simple and flexible, the scouring and wearing of a feed water regulating valve are avoided, and the service life of the regulating valve is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of a water feeding system of a waste heat boiler of a gas turbine heat supply unit, in particular to a water feeding system of a waste heat boiler of a gas turbine heat supply unit. BACKGROUND

[0002] At present, in China, a gas turbine power plant has more advantages than a coal-fired power plant, such as high efficiency, energy saving, environmental protection, fast start and stop, less land occupation, less investment, etc., and is therefore more used for grid peak shaving or heat and power cogeneration. A large gas turbine power plant adopts a three-pressure reheat water-steam system, when the unit supplies steam to the outside, there are two cases of recovery and non-recovery of heat supply condensate water, if the condensate water is not recovered, a heat supply makeup water pump needs to be arranged in the condensate makeup water system.

[0003] A conventional water feeding system of a waste heat boiler of a gas turbine heat supply unit adopts a boiler water feeding pump to feed water to a low-pressure system, and after the waste heat boiler is started, the water in the low-pressure system is fed to a high-pressure system and a medium-pressure system by a high-pressure feed water pump and a medium-pressure feed water pump of the waste heat boiler respectively. After the waste heat boiler is started, the pressure in the high-pressure water-steam system and the medium-pressure water-steam system of the boiler is very high, and therefore a feed water pump with sufficient power is needed to feed water to the high-pressure water-steam system and the medium-pressure water-steam system respectively. Although the conventional water feeding system of the waste heat boiler of the gas turbine heat supply unit has the advantage of simple system arrangement, only one water feeding pipeline to the low-pressure system needs to be arranged, the initial investment of the conventional water feeding system of the waste heat boiler of the gas turbine heat supply unit is high, a special boiler water feeding pump needs to be arranged, the operation energy consumption is high, because the boiler water feeding pump only feeds water to the low-pressure system, the high-pressure feed water pump and the medium-pressure feed water pump need to be started to feed water to the high-pressure system and the medium-pressure system respectively, the greater the power of the feed water pump, the higher the operation energy consumption, the operation regulation flexibility is poor, because the water feeding process involves the high-pressure feed water system and the medium-pressure feed water system and the closed cooling water system, the operation regulation is complex, and the scheme has high requirements for the preconditions of operation, the operation condition of the feed water regulating valve is poor, because the head of the high-pressure feed water pump and the medium-pressure feed water pump is very high, during the water feeding process of the high-pressure system and the medium-pressure system, the feed water regulating valve needs to be throttled greatly, which leads to large erosion and wear of the feed water regulating valve and shortens the service life of the feed water regulating valve. SUMMARY

[0004] The present application aims to solve at least one of the technical problems in the prior art, such as high initial investment, high operation energy consumption, poor operation regulation flexibility and poor operation condition of the feed water regulating valve.

[0005] To this end, the present application provides a water feeding system of a waste heat boiler of a gas turbine heat supply unit.

[0006] The present application provides a water feeding system of a waste heat boiler of a gas turbine heat supply unit, which comprises a heat supply makeup water pipeline, a boiler water feeding pipeline and a unit makeup water pipeline, the output ends of the heat supply makeup water pipeline are communicated with the boiler water feeding pipeline and the unit makeup water pipeline respectively, and the boiler water feeding pipeline and the unit makeup water pipeline are coupled to a boiler water-steam system respectively.

[0007] The heat supply and water supply pipeline is provided with a heat supply and water supply pump, which is used to provide water supply power to the boiler water supply pipeline and the unit water supply pipeline respectively.

[0008] The input end of the heat supply and water supply pipeline can be a desalination tank or other input water tank. Taking the desalination tank as an example, the water in the desalination tank is output to the boiler water supply pipeline to supply water to the boiler steam-water system, or to the unit water supply pipeline to supply water to the boiler steam-water system through the heat supply and water supply pump on the heat supply and water supply pipeline. The above pipeline connection mode enables the heat supply and water supply pump to undertake the water supply function of the boiler water pump in the conventional gas turbine heat supply unit waste heat boiler water supply system, thereby saving the investment cost of the boiler water pump. The boiler water supply pipeline and the unit water supply pipeline can be controlled to be opened or closed. Specifically, before the unit starts to operate, the boiler water supply pipeline is opened and the unit water supply pipeline is closed to supply water to the boiler steam-water system. At this time, since the waste heat boiler is not started, the pressure in the boiler steam-water system is low, and therefore the pressure of the heat supply and water supply pump for heat supply and water supply can meet the water supply power requirement to send the water in the desalination tank to the boiler steam-water system. The boiler steam-water system generally includes a low-pressure steam-water system, a medium-pressure steam-water system and a high-pressure steam-water system. The heat supply and water supply pipeline can be connected to any one or more of the above steam-water systems, thereby saving the boiler water pump.

[0009] The unit water supply pipeline can be in any form of the existing water supply pipeline. After the boiler steam-water system is completed, the boiler water supply pipeline can be closed and the unit water supply pipeline can be opened to supply water to the unit in a timely manner during the operation of the unit. It should be noted that the water supply operation is not necessarily performed before the unit is started. For example, if the power of the existing heat supply and water supply pump is sufficient, the water supply operation can be performed at the initial stage of preheating or operation of the unit when the pressure in the pipeline is low.

[0010] It should be noted that the pipeline, the pipeline coupling and the system coupling in this document can be connected to the pipeline or the system through other components, or can be directly connected to the pipeline or the system.

[0011] According to the above technical solution of the gas turbine heat supply unit waste heat boiler water supply system, the following additional technical features can also be provided:

[0012] In the above technical solution, the boiler water supply pipeline includes a boiler low-pressure water supply pipeline, a boiler medium-pressure water supply pipeline and a boiler high-pressure water supply pipeline connected in parallel at the output end of the heat supply and water supply pipeline. The boiler steam-water system includes a low-pressure steam-water system, a medium-pressure steam-water system and a high-pressure steam-water system. The boiler low-pressure water supply pipeline is coupled to the low-pressure steam-water system, the boiler medium-pressure water supply pipeline is coupled to the medium-pressure steam-water system, and the boiler high-pressure water supply pipeline is coupled to the high-pressure steam-water system.

[0013] In the technical scheme, the water feeding operations of the low-pressure water-steam system, the medium-pressure water-steam system and the high-pressure water-steam system are all completed by the heat-supply make-up water pump on the heat-supply make-up water pipeline, and the water in the brine tank flows to the low-pressure water feeding pipeline of the boiler, the medium-pressure water feeding pipeline of the boiler or the high-pressure water feeding pipeline of the boiler through the heat-supply make-up water pump, and then flows to the low-pressure water-steam system, the medium-pressure water-steam system and the high-pressure water-steam system, respectively.

[0014] In the technical scheme, the low-pressure water feeding pipeline of the boiler, the medium-pressure water feeding pipeline of the boiler and the high-pressure water feeding pipeline of the boiler are respectively provided with a switch group for controlling the opening and closing of the pipeline.

[0015] In the technical scheme, the opening and closing of the low-pressure water feeding pipeline of the boiler, the medium-pressure water feeding pipeline of the boiler and the high-pressure water feeding pipeline of the boiler are respectively controlled by the switch group, so as to adjust the water feeding sequence of different water feeding pipelines. In the specific operation, the water feeding of the low-pressure water-steam system, the medium-pressure water-steam system and the high-pressure water-steam system can be sequentially performed. When the water feeding operation of a single water-steam system is performed, the switch group of the water feeding pipeline connected to the water-steam system is opened, and the switch groups of the water feeding pipelines connected to the other two water-steam systems are in the closed state.

[0016] One valve or multiple valves can be arranged in the switch group, which can be arranged according to different needs. When multiple valves are adopted, the multiple valves can be connected in parallel or in series.

[0017] In the technical scheme, the switch group comprises an electrically-controlled closing valve, a manually-controlled valve and a check valve connected in series.

[0018] In the technical scheme, the electrically-controlled closing valve is used to realize the electrically-controlled opening and closing of the water feeding pipeline, so as to realize remote operation and the like. The manually-controlled valve is used to realize the manually-controlled opening and closing of the water feeding pipeline, which can be manually operated to close the valve when the electrically-controlled operation is invalid or during maintenance. The check valve is used to prevent the water in the boiler water-steam system from flowing back to the water feeding pipeline.

[0019] In the technical scheme, a low-pressure steam drum is further arranged, the output end of the low-pressure water feeding pipeline of the boiler is coupled to the low-pressure steam drum, and the low-pressure steam drum is connected to the low-pressure water-steam system.

[0020] The low-pressure steam drum is further coupled to the high-pressure water-steam system through the high-pressure feed water pump, and the pipeline where the high-pressure feed water pump is arranged is in communication with the output end of the high-pressure water feeding pipeline of the boiler.

[0021] In the technical scheme, the water flowing out of the output end of the low-pressure water feeding pipeline of the boiler can sequentially pass through a first control valve, a low-pressure first-stage economizer in the waste heat boiler, a low-pressure second-stage economizer in the waste heat boiler, a second control valve and a deaerator, and then enter the low-pressure steam drum. The water flowing out of the output end of the low-pressure water feeding pipeline of the boiler can also sequentially pass through a first control valve, a condensate recirculation pump and a second control valve, and then enter the low-pressure steam drum.

[0022] The water flow into the low-pressure steam drum flows to the low-pressure evaporator in the waste heat boiler, evaporates after absorbing heat, returns to the low-pressure steam drum, and is transported to the low-pressure water-steam system through an output end of the low-pressure steam drum.

[0023] Meanwhile, another output end of the low-pressure steam drum also communicates with the high-pressure water-steam system through the high-pressure feed water pump; specifically, the input end of the high-pressure feed water pump communicates with the low-pressure steam drum through a pipeline, and the output end of the high-pressure feed water pump and the output end of the boiler high-pressure water feeding pipeline converge through a pipeline and are then transported to the high-pressure water-steam system; similarly, the output end of the high-pressure feed water pump converges with the output end of the boiler high-pressure water feeding pipeline through a pipeline and then flows to the high-pressure primary economizer in the waste heat boiler and the like and enters the high-pressure water-steam system.

[0024] In the above technical solution, the low-pressure steam drum is further coupled to the low-pressure water-steam system through the low-pressure steam drum and the low-pressure water-steam system.

[0025] The low-pressure steam drum is further coupled to the low-pressure water-steam system through the medium-pressure feed water pump; the pipeline where the medium-pressure feed water pump is located communicates with the output end of the boiler medium-pressure water feeding pipeline.

[0026] In the above technical solution, the water flow through the output end of the boiler low-pressure water feeding pipeline can sequentially pass through the first control valve, the low-pressure primary economizer in the waste heat boiler, the low-pressure secondary economizer in the waste heat boiler, the second control valve, and the deaerator and then enter the low-pressure steam drum; the water flow through the output end of the boiler low-pressure water feeding pipeline can also sequentially pass through the first control valve, the condensate recirculation pump, and the second control valve and then enter the low-pressure steam drum.

[0027] The water flow into the low-pressure steam drum flows to the low-pressure evaporator in the waste heat boiler, evaporates after absorbing heat, returns to the low-pressure steam drum, and is transported to the low-pressure water-steam system through an output end of the low-pressure steam drum.

[0028] Meanwhile, another output end of the low-pressure steam drum also communicates with the high-pressure water-steam system through the high-pressure feed water pump; specifically, the input end of the high-pressure feed water pump communicates with the low-pressure steam drum through a pipeline, and the output end of the high-pressure feed water pump and the output end of the boiler high-pressure water feeding pipeline converge through a pipeline and are then transported to the high-pressure water-steam system; similarly, the output end of the high-pressure feed water pump converges with the output end of the boiler high-pressure water feeding pipeline through a pipeline and then flows to the high-pressure primary economizer in the waste heat boiler and the like and enters the high-pressure water-steam system.

[0029] In the above technical solution, the output end of the boiler low-pressure water feeding pipeline communicates with the output end of the unit water feeding pipeline.

[0030] In the technical scheme, the output end of the unit water supplement pipeline and the output end of the boiler low-pressure water feeding pipeline both flow to the low-pressure steam drum, when water supplement to the unit is needed, each pipeline of the boiler water feeding pipeline is in a closed state, the unit water supplement pipeline is opened, and the low-pressure steam drum is supplemented with water, so that water supplement to the low-pressure steam-water system is realized, and meanwhile, the high-pressure steam-water system and the medium-pressure steam-water system can be supplemented with water through the high-pressure feed water pump and the medium-pressure feed water pump connected with the low-pressure steam drum respectively.

[0031] In any of the above technical schemes, the first heat supply water supplement pipeline and the second heat supply water supplement pipeline are connected in parallel between the input end and the output end of the heat supply water supplement pipeline, and a heat supply water supplement pump is arranged on each of the first heat supply water supplement pipeline and the second heat supply water supplement pipeline.

[0032] In the technical scheme, the first heat supply water supplement pipeline and the second heat supply water supplement pipeline are mutual backups, and when both are started, the output power of the heat supply water supplement pipeline can be increased.

[0033] In any of the above technical schemes, a switch group for controlling the opening and closing of the heat supply water supplement pipeline is arranged on each of the first heat supply water supplement pipeline and the second heat supply water supplement pipeline.

[0034] In the technical scheme, the switch group comprises an electrically-controlled closing valve, a manually-controlled valve and a check valve, wherein the check valve is used to prevent the water in the unit water supplement pipeline and the boiler water feeding pipeline from flowing back to the heat supply water supplement pipeline.

[0035] In any of the above technical schemes, a control valve for controlling the opening and closing of the unit water supplement pipeline is arranged on the unit water supplement pipeline.

[0036] In the technical scheme, the opening and closing of the unit water supplement pipeline is controlled through the control valve.

[0037] In summary, due to the adoption of the above technical features, the present application has the following beneficial effects:

[0038] The heat supply water supplement pump of the gas turbine heat supply unit is used, and pipelines for feeding water to the high-pressure system, the medium-pressure system and the low-pressure system of the boiler are arranged at the outlet of the pump, the heat supply water supplement pump is opened, and water feeding can be quickly and conveniently completed through valve switching, which is energy-saving, reduces initial investment and operation energy consumption, and makes operation more simple and flexible, avoids the erosion and wear of the feed water regulating valve, and prolongs the service life of the regulating valve.

[0039] Additional aspects and advantages of the present application will become apparent from the following description of the embodiments, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0041] Fig. 1A pipe connection diagram of a heat supply unit waste heat boiler water feeding system according to an embodiment of the present application is shown in FIG. 1.

[0042] Fig. 2 A pipe connection diagram of a conventional heat supply unit waste heat boiler water feeding system is shown in FIG. 2.

[0043] wherein, Figs. 1-2 The correspondence between the reference signs and the component names in the drawings is as follows:

[0044] 1, heat supply make-up water pipe; 2, boiler water feeding pipe; 3, unit make-up water pipe; 4, low pressure water-steam system; 5, medium pressure water-steam system; 6, high pressure water-steam system;

[0045] 11, first heat supply make-up water pipe; 12, second heat supply make-up water pipe;

[0046] 111, heat supply make-up water pump;

[0047] 21, boiler low pressure water feeding pipe; 22, boiler medium pressure water feeding pipe; 23, boiler high pressure water feeding pipe; 24, electrically operated shut-off valve; 25, manually controlled valve; 26, check valve;

[0048] 41, low pressure drum;

[0049] 51, medium pressure feed water pump;

[0050] 61, high pressure feed water pump. DETAILED DESCRIPTION

[0051] In order to more clearly understand the above objectives, features and advantages of the present application, the present application will be further described below in details with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, and therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0053] The heat supply unit waste heat boiler water feeding system according to some embodiments of the present application will be described below with reference to Figs. 1-2

[0054] Some embodiments of the present application provide a heat supply unit waste heat boiler water feeding system.

[0055] As Figs. 1-2 ​As shown, the first embodiment of the present application proposes a heat supply unit waste heat boiler water supply system, comprising: a heat supply water supply pipeline 1, a boiler water supply pipeline 2 and a unit water supply pipeline 3, the output end of the heat supply water supply pipeline 1 is communicated with the boiler water supply pipeline 2 and the unit water supply pipeline 3 respectively; the boiler water supply pipeline 2 and the unit water supply pipeline 3 are coupled to the boiler steam-water system respectively;

[0056] The heat supply water supply pipeline 1 is provided with a heat supply water supply pump 111, and the heat supply water supply pump 111 is used to provide water supply power to the boiler water supply pipeline 2 and the unit water supply pipeline 3 respectively.

[0057] The heat supply water supply pipeline 1 of the heat supply unit waste heat boiler water supply system proposed in the embodiment can be a desalted water tank or other input water tank. Taking the desalted water tank as an example, the water in the desalted water tank is output to the boiler water supply pipeline 2 to supply water to the boiler steam-water system or to the unit water supply pipeline 3 to supply water to the boiler steam-water system through the heat supply water supply pump 111 on the heat supply water supply pipeline 1. Through the above pipeline connection mode, the heat supply water supply pump 111 can undertake the water supply function of the boiler water supply pump in the conventional heat supply unit waste heat boiler water supply system, and the investment cost of the boiler water supply pump can be saved. The boiler water supply pipeline 2 and the unit water supply pipeline 3 can be controlled to be opened and closed. Specifically, before the unit starts to operate, the boiler water supply pipeline 2 is opened and the unit water supply pipeline 3 is closed to supply water to the boiler steam-water system. At this time, since the waste heat boiler is not started, the pressure in the boiler steam-water system is low, so the pressure of the heat supply water supply pump 111 used for heat supply water supply can meet the water supply power requirement, and the water in the desalted water tank is sent to the boiler steam-water system. Generally, the boiler steam-water system includes a low-pressure steam-water system 4, a medium-pressure steam-water system 5 and a high-pressure steam-water system 6. The heat supply water supply pipeline 1 can be communicated with any one or more of the above steam-water systems, and the boiler water supply pump can be saved.

[0058] The unit water supply pipeline 3 can be in any form of the existing water supply pipeline. In some embodiments, the unit water supply pipeline 3 is provided with a condenser, a condensate pump and a switch valve and the like. After the boiler steam-water system is completed, the boiler water supply pipeline 2 can be closed and the unit water supply pipeline 3 can be opened to supply water to the unit in time during the operation of the unit. It should be noted that the water supply operation is not necessarily performed before the unit is started. For example, if the power of the existing heat supply water supply pump 111 is sufficient, the water supply operation can be performed at the initial stage of the unit preheating or operation when the pressure in the pipeline is low.

[0059] It should be noted that the pipeline, the pipeline coupling and the pipeline and system coupling in the present application can be that the pipeline is communicated with the pipeline or the system through other components, or that the pipeline is directly communicated with the pipeline or the system.

[0060] The second embodiment of the present application provides a water feeding system for a waste heat boiler of a gas turbine heat supply unit, and based on the first embodiment, as shown in Figs. 1-2 The boiler water feeding pipeline 2 comprises a boiler low-pressure water feeding pipeline 21, a boiler medium-pressure water feeding pipeline 22 and a boiler high-pressure water feeding pipeline 23 connected in parallel at the output end of the heat supply water feeding pipeline 1; the boiler steam-water system comprises a low-pressure steam-water system 4, a medium-pressure steam-water system 5 and a high-pressure steam-water system 6; the boiler low-pressure water feeding pipeline 21 is coupled to the low-pressure steam-water system 4, the boiler medium-pressure water feeding pipeline 22 is coupled to the medium-pressure steam-water system 5, and the boiler high-pressure water feeding pipeline 23 is coupled to the high-pressure steam-water system 6.

[0061] In this embodiment, the water feeding operations of the low-pressure steam-water system 4, the medium-pressure steam-water system 5 and the high-pressure steam-water system 6 are all completed by the heat supply water feeding pump 111 of the heat supply water feeding pipeline 1, and the water in the brine tank flows to the boiler low-pressure water feeding pipeline 21, the boiler medium-pressure water feeding pipeline 22 or the boiler high-pressure water feeding pipeline 23 through the heat supply water feeding pump 111, and then flows to the low-pressure steam-water system 4, the medium-pressure steam-water system 5 and the high-pressure steam-water system 6, respectively.

[0062] The third embodiment of the present application provides a water feeding system for a waste heat boiler of a gas turbine heat supply unit, and based on any of the above embodiments, as shown in Figs. 1-2 The boiler low-pressure water feeding pipeline 21, the boiler medium-pressure water feeding pipeline 22 and the boiler high-pressure water feeding pipeline 23 are respectively provided with a switch group for controlling the opening and closing of the pipelines.

[0063] In this embodiment, the opening and closing of the boiler low-pressure water feeding pipeline 21, the boiler medium-pressure water feeding pipeline 22 and the boiler high-pressure water feeding pipeline 23 are controlled by the switch groups, so as to adjust the water feeding sequence of different water feeding pipelines, and in specific operation, the water feeding of the low-pressure steam-water system 4, the medium-pressure steam-water system 5 and the high-pressure steam-water system 6 can be performed in sequence, when the water feeding operation of a single steam-water system is performed, the switch group of the water feeding pipeline connected to the steam-water system is opened, and the switch groups of the water feeding pipelines connected to the other two steam-water systems are in closed state.

[0064] One valve or multiple valves can be arranged in the switch group, which can be set according to different needs; when multiple valves are used, the connection mode of the multiple valves can be parallel or series.

[0065] The fourth embodiment of the present application provides a water feeding system for a waste heat boiler of a gas turbine heat supply unit, and based on any of the above embodiments, as shown in Figs. 1-2 The switch group comprises a series-connected electrically-controlled closing valve 24, a manually-controlled valve 25 and a check valve 26.

[0066] In this embodiment, the electrically-operated closing valve 24 is used to realize the electrically-operated control of the opening and closing of the water supply pipeline, so as to realize remote operation and the like; the manually-operated control valve 25 is used to realize the manually-operated control of the opening and closing of the water supply pipeline, and the valve can be manually operated to be closed when the electrically-operated control is invalid or during maintenance; the check valve 26 is used to prevent the water in the boiler steam-water system from flowing back to the water supply pipeline.

[0067] The fifth embodiment of the present application provides a water supply system of a waste heat boiler of a gas turbine heat supply unit, and as shown in Figs. 1-2 The output end of the boiler low-pressure water supply pipeline 21 is coupled to the low-pressure steam drum 41, and the low-pressure steam drum 41 is connected to the low-pressure steam-water system 4;

[0068] The low-pressure steam drum 41 is further coupled to the high-pressure steam-water system 6 through the high-pressure feed water pump 61; the pipeline where the high-pressure feed water pump 61 is located is in communication with the output end of the boiler high-pressure water supply pipeline 23.

[0069] In this embodiment, the water flowing through the output end of the boiler low-pressure water supply pipeline 21 can sequentially pass through the first control valve, the low-pressure primary economizer in the waste heat boiler, the low-pressure secondary economizer in the waste heat boiler, the second control valve, and the deaerator, and then enter the low-pressure steam drum 41; the water flowing through the output end of the boiler low-pressure water supply pipeline 21 can also sequentially pass through the first control valve, the condensate recirculation pump, and the second control valve, and then enter the low-pressure steam drum 41.

[0070] The water flowing into the low-pressure steam drum 41 flows to the low-pressure evaporator in the waste heat boiler, is evaporated by heat absorption, returns to the low-pressure steam drum 41, and is then delivered to the low-pressure steam-water system 4 through an output end of the low-pressure steam drum 41.

[0071] Meanwhile, another output end of the low-pressure steam drum 41 is also in communication with the high-pressure steam-water system 6 through the high-pressure feed water pump 61; specifically, the input end of the high-pressure feed water pump 61 is in communication with the low-pressure steam drum 41 through a pipeline, the output end of the high-pressure feed water pump 61 is in communication with the output end of the boiler high-pressure water supply pipeline 23 through a pipeline, and the two output ends are then delivered to the high-pressure steam-water system 6; similarly, the output end of the high-pressure feed water pump 61 is in communication with the output end of the boiler high-pressure water supply pipeline 23 through a pipeline, and the two output ends then flow to the high-pressure primary economizer in the waste heat boiler and the like, and then enter the high-pressure steam-water system 6.

[0072] The sixth embodiment of the present application provides a water supply system of a waste heat boiler of a gas turbine heat supply unit, and as shown in Figs. 1-2 The output end of the boiler low-pressure water supply pipeline 21 is coupled to the low-pressure steam drum 41, and the low-pressure steam drum 41 is connected to the low-pressure steam-water system 4;

[0073] The low-pressure steam drum 41 is also coupled to the low-pressure steam-water system 4 via the medium-pressure feed water pump 51; the pipeline where the medium-pressure feed water pump 51 is located is connected to the output end of the boiler medium-pressure water supply pipeline 22.

[0074] In this embodiment, after the water flows through the output end of the boiler low-pressure water supply pipe 21, it can sequentially pass through the first control valve, the low-pressure primary economizer in the waste heat boiler, the low-pressure secondary economizer in the waste heat boiler, the second control valve, and the deaerator before entering the low-pressure steam drum 41; after the water flows through the output end of the boiler low-pressure water supply pipe 21, it can also sequentially pass through the first control valve, the condensate recirculation pump, and the second control valve before entering the low-pressure steam drum 41.

[0075] The water entering the low-pressure steam drum 41 flows to the low-pressure evaporator in the waste heat boiler. After absorbing heat and evaporating, it returns to the low-pressure steam drum 41 and is then transported to the low-pressure steam-water system 4 through one of the output ends of the low-pressure steam drum 41.

[0076] Meanwhile, the other output end of the low-pressure steam drum 41 is also connected to the medium-pressure steam-water system 5 via the medium-pressure feedwater pump 51. Specifically, the input end of the medium-pressure feedwater pump 51 is connected to the low-pressure steam drum 41 through a pipeline, and the output end of the medium-pressure feedwater pump 51 and the output end of the boiler medium-pressure water supply pipeline 22 are connected through a pipeline and then transported to the medium-pressure steam-water system 5. Similarly, the output end of the medium-pressure feedwater pump 51 is connected to the output end of the boiler medium-pressure water supply pipeline 22 through a pipeline and then flows to the medium-pressure primary economizer in the waste heat boiler and then enters the medium-pressure steam-water system 5.

[0077] The seventh embodiment of the present invention proposes a waste heat boiler water supply system for a gas turbine heating unit, and based on any of the above embodiments, such as... Figs. 1-2 As shown, the output end of the boiler low-pressure water supply pipe 21 is connected to the output end of the unit water supply pipe 3.

[0078] In this embodiment, the output end of the unit water supply pipeline 3 and the output end of the boiler low-pressure water supply pipeline 21 both flow to the low-pressure steam drum 41. When water needs to be supplied to the unit, all pipelines of the boiler water supply pipeline 2 are closed, and the unit water supply pipeline 3 is opened to supply water to the low-pressure steam drum 41, thereby supplying water to the low-pressure steam-water system 4. At the same time, water can also be supplied to the high-pressure steam-water system 6 and the medium-pressure steam-water system 5 respectively through the high-pressure feedwater pump 61 and the medium-pressure feedwater pump 51 connected to the low-pressure steam drum 41.

[0079] The eighth embodiment of the present invention proposes a waste heat boiler water supply system for a gas turbine heating unit, and based on any of the above embodiments, such as... Figs. 1-2 As shown, a first heating water supply pipe 11 and a second heating water supply pipe 12 are connected in parallel between the input end and the output end of the heating water supply pipe 1. A heating water supply pump 111 is provided on the first heating water supply pipe 11 and the second heating water supply pipe 12 respectively.

[0080] In this embodiment, the first heating water supply pipe 11 and the second heating water supply pipe 12 serve as backups for each other, and can also increase the output power of the heating water supply pipe 1 when started.

[0081] The ninth embodiment of the present invention proposes a waste heat boiler water supply system for a gas turbine heating unit, and based on any of the above embodiments, such as... Figs. 1-2 As shown, the first heating water supply pipeline 1 and the second heating water supply pipeline 1 are respectively equipped with switch groups for controlling the opening and closing of the heating water supply pipeline 1.

[0082] In this embodiment, the switch group includes an electrically operated shut-off valve 24, a manually operated control valve 25, and a check valve 26, wherein the check valve 26 is used to prevent water in the unit water supply line 3 and the boiler water supply line 2 from flowing back to the heating water supply line 1.

[0083] The tenth embodiment of this invention proposes a waste heat boiler water supply system for a gas turbine heating unit, and based on any of the above embodiments, such as... Figs. 1-2 As shown, the unit water supply pipeline 3 is equipped with a control valve that controls the opening and closing of the unit water supply pipeline 3.

[0084] In this embodiment, the opening and closing of the unit's water supply pipeline 3 is controlled by a control valve.

[0085] The first specific embodiment of this invention proposes a waste heat boiler water supply system for a gas turbine heating unit. For ease of technical and economic comparison and analysis, a specific project is used as an example. Fig. 2 As shown, the equipment configuration of the waste heat boiler water supply system for a conventional gas turbine heating unit is as follows: the volume of the high, medium, and low pressure steam-water systems of the waste heat boiler is approximately 300m³. 3 80m 3 270m 3 Total approximately 650m 3 When the water filling process takes 2-3 hours, the boiler feed pump can be selected as follows: 220t / h, 60mH2O, motor power 75kW. The heating water supply pump can be selected as follows: 220t / h, 80mH2O, 90kW. Typical parameters for high and medium pressure feed pumps are as follows: High pressure feed pump: 630t / h, 2080mH2O, 4700kW; Medium pressure feed pump: 160t / h, 570mH2O, 400kW.

[0086] When using the waste heat boiler water supply system of the gas turbine heating unit in this embodiment, it is only necessary to remove the boiler water supply pump in the above configuration and add a low-pressure boiler water supply pipeline, a medium-pressure boiler water supply pipeline, and a high-pressure boiler water supply pipeline; the pipeline connection is as follows. Fig. 1 As shown.

[0087] In this project, the electricity price is calculated at 0.655 yuan / kW.h;

[0088] The number of annual water feeding of the waste heat boiler is 10 times;

[0089] The water feeding time of the boiler water feeding pump is about 3 hours / time, the water feeding time of the high pressure and medium pressure water feeding pumps is about 0.5 hours / time respectively, and the water feeding time of the condensate water feeding pump is about 3 hours / time. The operation power consumption of the boiler water feeding pump is about 60 kW, the single water feeding power consumption is 60*3*0.665=120 yuan; the operation power consumption of the high pressure and medium pressure water feeding pumps is 4100 kW and 350 kW respectively, the single water feeding power consumption is (4100+350)*0.5*0.655=1457 yuan; the operation power of the heat supply water feeding pump is about 80 kW, and the single water feeding power consumption is 80*3*0.655=157 yuan.

[0090] The technical and economic comparison of the two water feeding schemes of the boiler is shown in the following table:

[0091]

[0092]

[0093] Comprehensively considering the advantages and disadvantages of the two schemes, the new type boiler water feeding scheme with low initial investment, low energy consumption and simple and flexible operation is recommended, i.e. the heat supply water feeding pump is used to feed water to the boiler, the water feeding pipelines to the high, medium and low pressure systems are respectively set, and the equipment already configured for the unit is fully utilized.

[0094] In this specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0095] Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waste heat boiler water supply system for a gas turbine heating unit, characterized in that, include: Heating water supply pipeline (1), boiler water supply pipeline (2) and unit water supply pipeline (3), the output end of the heating water supply pipeline (1) is connected to the boiler water supply pipeline (2) and the unit water supply pipeline (3) respectively; the boiler water supply pipeline (2) and the unit water supply pipeline (3) are respectively coupled to the boiler steam-water system; The heating water supply pipeline (1) is equipped with a heating water supply pump (111), which is used to provide water supply and water supply power to the boiler water supply pipeline (2) and the unit water supply pipeline (3) respectively. The boiler water supply pipeline (2) includes a boiler low-pressure water supply pipeline (21), a boiler medium-pressure water supply pipeline (22), and a boiler high-pressure water supply pipeline (23) connected in parallel at the output end of the heating water supply pipeline (1); the boiler steam-water system includes a low-pressure steam-water system (4), a medium-pressure steam-water system (5), and a high-pressure steam-water system (6); the boiler low-pressure water supply pipeline (21) is coupled to the low-pressure steam-water system (4), the boiler medium-pressure water supply pipeline (22) is coupled to the medium-pressure steam-water system (5), and the boiler high-pressure water supply pipeline (23) is coupled to the high-pressure steam-water system (6); It also includes a low-pressure steam drum (41), the output end of the boiler low-pressure water supply pipe (21) is coupled to the low-pressure steam drum (41), and the low-pressure steam drum (41) is connected to the low-pressure steam-water system (4); The low-pressure steam drum (41) is also coupled to the high-pressure steam and water system (6) via a high-pressure feed water pump (61); the pipeline where the high-pressure feed water pump (61) is located is connected to the output end of the boiler high-pressure water supply pipeline (23); The low-pressure steam drum (41) is also coupled to the low-pressure steam-water system (4) via a medium-pressure feed water pump (51); the pipeline where the medium-pressure feed water pump (51) is located is connected to the output end of the boiler medium-pressure water supply pipeline (22); The output end of the boiler low-pressure water supply pipe (21) is connected to the output end of the unit water supply pipe (3).

2. The waste heat boiler water supply system for a gas turbine heating unit according to claim 1, characterized in that, The boiler low-pressure water supply pipe (21), boiler medium-pressure water supply pipe (22) and boiler high-pressure water supply pipe (23) are respectively equipped with switch groups for controlling the opening and closing of the pipes.

3. The waste heat boiler water supply system for a gas turbine heating unit according to claim 2, characterized in that, The switch assembly includes an electrically operated shut-off valve (24), a manually operated control valve (25), and a check valve (26) connected in series.

4. A waste heat boiler water supply system for a gas turbine heating unit according to any one of claims 1 to 3, characterized in that, The heating water supply pipeline (1) has a first heating water supply pipeline (11) and a second heating water supply pipeline (12) connected in parallel between its input and output ends. The first heating water supply pipeline (11) and the second heating water supply pipeline (12) are respectively equipped with heating water supply pumps (111).

5. The waste heat boiler water supply system for a gas turbine heating unit according to claim 4, characterized in that, The first heating water supply pipeline (11) and the second heating water supply pipeline (12) are respectively equipped with switch groups for controlling the opening and closing of the heating water supply pipeline (1).

6. A waste heat boiler water supply system for a gas turbine heating unit according to any one of claims 1 to 3, characterized in that, The unit water supply pipeline (3) is equipped with a control valve that controls the opening and closing of the unit water supply pipeline (3).

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