Heat supply unit system

Abstract

The heat supply unit system comprises a first steam turbine, a second steam turbine, a first condenser, a first hot well, a second condenser, a second hot well, a first waste heat utilization pipeline, a second waste heat utilization pipeline and a self-flowing pipeline. Through the arrangement of the first steam condenser and the second steam condenser, waste heat utilization is achieved, due to the fact that the back pressure of the first steam turbine is larger than that of the second steam turbine, temperature difference exists between the condensing temperature of the first steam condenser and the condensing temperature of the second steam condenser, gradient heating can be achieved, and the waste heat utilization efficiency can be further improved; due to the fact that the back pressure of the first steam turbine is larger than that of the second steam turbine, the pressure of the first hot well is larger than that of the second hot well, condensate water in the first hot well can be supplied into the second hot well through pressure difference, the condensate water is output through the second hot well, and reuse of the condensate water can be achieved; the arrangement of drainage pumps and pipelines can be reduced, so that the system is simpler in structure and more energy-saving.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power plant waste heat, in particular to a heat supply unit system. BACKGROUND

[0002] With the improvement of people's living standards, in the cold winter, especially the people in the northern region, the demand for heating is increasing, which leads to the increase of the demand for heating in China, which will bring great challenges to the heating capacity of China. In order to be efficient and energy-saving, higher requirements are put forward for the optimization of the thermal system of the power plant. In the current technology, the condensers and heaters of the power plant heat network at all levels are respectively configured with drainage pumps, and the drainage is directly discharged into the last stage condenser hot well (condensate tank) after being boosted, the system is complex and the energy consumption is high, and the waste heat and pressure are not fully utilized. CONTENT OF THE INVENTION

[0003] In the content part of the application, a series of simplified concepts are introduced, which will be further described in detail in the specific embodiment part. This part of the application does not mean to try to limit the key features and necessary technical features of the claimed technical scheme, and more does not mean to try to determine the protection scope of the claimed technical scheme.

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, the present application provides a heat supply unit system, which comprises:

[0006] The first steam turbine and the second steam turbine, the back pressure of the first steam turbine is greater than that of the second steam turbine;

[0007] The first waste heat utilization pipeline, the first condenser and the first hot well, the first steam turbine, the first condenser and the first hot well are sequentially arranged on the first waste heat utilization pipeline;

[0008] The second waste heat utilization pipeline, the second condenser and the second hot well, the second steam turbine, the second condenser and the second hot well are sequentially arranged on the second waste heat utilization pipeline;

[0009] The self-flow pipeline, the self-flow pipeline is connected with the first hot well and the second hot well.

[0010] In a feasible embodiment, the heat supply unit system further comprises:

[0011] The drainage throttle valve is arranged in the self-flow pipeline.

[0012] In an embodiment, the self-flowing pipeline is in a U shape, and the height of the connection between the self-flowing pipeline and the first hot well is lower than the height of the connection between the self-flowing pipeline and the second hot well.

[0013] In an embodiment, the heat supply unit system further comprises a heat network circulation pipeline, which passes through the second condenser first and then the first condenser.

[0014] In an embodiment, the heat supply unit system further comprises a first bypass pipeline, which is connected to the heat network circulation pipeline and is in parallel with the first condenser.

[0015] A second bypass pipeline is connected to the heat network circulation pipeline and is in parallel with the second condenser.

[0016] In an embodiment, the heat supply unit system further comprises a condensate pipeline, one end of which is connected to the second hot well.

[0017] In an embodiment, the heat supply unit system further comprises:

[0018] A drain cooler, the output end of the condensate pipeline is connected to the drain cooler.

[0019] A third waste heat utilization pipeline, which is connected to the drain cooler, is used to transport the liquid output by the peak heater.

[0020] In an embodiment, the heat supply unit system further comprises:

[0021] A backwater utilization pipeline, one end of which is connected to the drain cooler and the other end of which is connected to the first hot well, is used to supply the liquid output by the peak heater after waste heat utilization to the first hot well.

[0022] In an embodiment, the heat supply unit system further comprises:

[0023] A drain pressure reducing valve group is arranged on the backwater utilization pipeline and is arranged closer to the first hot well than the drain cooler.

[0024] In an embodiment, the heat supply unit system further comprises:

[0025] A third bypass pipeline is connected to the third waste heat utilization pipeline and the backwater utilization pipeline and is in parallel with the drain cooler.

[0026] Compared with the prior art, the utility model at least has the following beneficial effects:

[0027] The heating unit system provided by the embodiment of the application comprises a first steam turbine, a second steam turbine, a first condenser, a first hot well, a second condenser, a second hot well, a first waste heat utilization pipeline, a second waste heat utilization pipeline and a self-flow pipeline, based on which, in the working process, the first steam turbine converts the heat energy of steam into mechanical energy, and then the used steam is supplied to the first condenser through the first waste heat utilization pipeline, the steam forms condensed water after heat exchange in the first condenser, and the condensed water is transported to the first hot well through the first waste heat utilization pipeline; the second steam turbine converts the heat energy of steam into mechanical energy, and then the used steam is supplied to the second condenser through the second waste heat utilization pipeline, the steam forms condensed water after heat exchange in the second condenser, and the condensed water is transported to the second hot well through the second waste heat utilization pipeline. Through the arrangement of the first condenser and the second condenser, the waste heat is utilized, and since the back pressure of the first steam turbine is greater than that of the second steam turbine, the condensing temperature of the first condenser and the second condenser will have a temperature difference, gradient heating can be realized, and the utilization efficiency of the waste heat can be further improved; since the back pressure of the first steam turbine is greater than that of the second steam turbine, the pressure of the first hot well is greater than that of the second hot well, and the condensed water in the first hot well can be supplied to the second hot well by using the pressure difference, and the condensed water can be output through the second hot well, so that the condensed water can be reused, and through the self-flowing condensed water, the arrangement of the drain pump and the pipeline can be reduced, so that the system structure is simpler and more energy-saving.

[0028] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the scope of the application. Moreover, the same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0030] Figure 1 A schematic structural diagram of a heating unit system according to an embodiment of the application.

[0031] Wherein, Figure 1 The correspondence between the reference signs in the drawings and the component names is as follows:

[0032] 110 first steam turbine, 120 second steam turbine, 130 first condenser, 140 first hot well, 150 second condenser, 160 second hot well, 170 drain cooler;

[0033] 210 first waste heat utilization pipeline, 220 second waste heat utilization pipeline, 230 self-flow pipeline, 240 heat network circulation pipeline, 250 first bypass pipeline, 260 second bypass pipeline, 270 condensate pipeline, 280 third waste heat utilization pipeline, 290 backwater utilization pipeline, 2100 third bypass pipeline;

[0034] 310 drain throttling valve, 320 drain pressure reducing valve group. DETAILED DESCRIPTION

[0035] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the technical solutions provided by the present application. However, it will be apparent to one of ordinary skill in the art that the technical solutions provided by the present application can be practiced without one or more of these specific details.

[0036] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in the specification, it means that there is a presence of the described features, integers, steps, operations, elements, and / or components, but it does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0037] Now, the exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that the embodiments are provided in order to make the present disclosure complete and comprehensive, and to sufficiently convey the ideas of the exemplary embodiments to those of ordinary skill in the art.

[0038] It is considered that in the conventional technology, the power plant heat network each stage condenser, heater drain is respectively configured with a drain pump and a pipeline, the system is complex and has high energy consumption, the waste heat and the excess pressure are not fully utilized, and the drain is discharged into the last stage condenser, the high-temperature drain is gasified due to the sudden pressure drop, causing problems such as pipeline cavitation and vibration.

[0039] As Figure 1As shown, based on this, the application provides a heat supply unit system, comprising: a first steam turbine 110 and a second steam turbine 120, the back pressure of the first steam turbine 110 is greater than that of the second steam turbine 120; a first waste heat utilization pipeline 210, a first condenser 130 and a first hot well 140, the first steam turbine 110, the first condenser 130 and the first hot well 140 are sequentially arranged on the first waste heat utilization pipeline 210; a second waste heat utilization pipeline 220, a second condenser 150 and a second hot well 160, the second steam turbine 120, the second condenser and the second hot well 160 are sequentially arranged on the second waste heat utilization pipeline 220; a self-flow pipeline 230, the self-flow pipeline 230 guides the first hot well 140 and the second hot well 160.

[0040] The heat supply unit system provided by the embodiment of the application comprises the first steam turbine 110, the second steam turbine 120, the first condenser 130, the first hot well 140, the second condenser 150, the second hot well 160, the first waste heat utilization pipeline 210, the second waste heat utilization pipeline 220 and the self-flow pipeline 230, based on which, in the working process, the first steam turbine 110 converts the heat energy of steam into mechanical energy, and then the used steam is supplied to the first condenser 130 through the first waste heat utilization pipeline 210, the steam forms condensed water after heat exchange in the first condenser 130, and the condensed water is transported to the first hot well 140 through the first waste heat utilization pipeline 210; the second steam turbine 120 converts the heat energy of steam into mechanical energy, and then the used steam is supplied to the second condenser through the second waste heat utilization pipeline 220, the steam forms condensed water after heat exchange in the second condenser, and the condensed water is transported to the second hot well 160 through the second waste heat utilization pipeline 220. Through the arrangement of the first condenser 130 and the second condenser, the utilization of waste heat is realized, and since the back pressure of the first steam turbine 110 is greater than that of the second steam turbine 120, there is a temperature difference between the condensing temperatures of the first condenser 130 and the second condenser, gradient heating can be realized, and the utilization efficiency of waste heat can be further improved; since the back pressure of the first steam turbine 110 is greater than that of the second steam turbine 120, the pressure of the first hot well 140 is greater than that of the second hot well 160, the condensed water in the first hot well 140 can be supplied into the second hot well by using the pressure difference, and the condensed water is output through the second hot well 160, so that the reuse of condensed water can be realized, through the self-flowing condensed water, the arrangement of the drain pump and the pipeline can be reduced, so that the system structure is simpler and more energy-saving.

[0041] As shown in the feasible implementation manner, Figure 1 the heat supply unit system further comprises a drain throttling valve 310, and the drain throttling valve 310 is arranged on the self-flow pipeline 230.

[0042] In the technical solution, the drain throttling valve 310 can be arranged on the self-flow pipeline 230. By arranging the drain throttling valve 310, the pipeline water resistance can be adjusted to adapt to the low-pressure cylinder back pressure variation of the high-pressure side and the low-pressure side of the steam turbine, and the water level of the first hot well 140 and the second hot well 160 of the condensers of the high-pressure side and the low-pressure side can be stabilized. Specifically, the drain throttling valve 310 is an electric butterfly valve, which can also be used as a pipeline isolation valve to further improve the system stability.

[0043] As shown in Figure 1 In a feasible implementation, the self-flow pipeline 230 is in a U shape, and the height of the connection between the self-flow pipeline 230 and the first hot well 140 is lower than the height of the connection between the self-flow pipeline 230 and the second hot well 160.

[0044] In the technical solution, the style of the self-flow pipeline 230 is further provided. The self-flow pipeline 230 can be in a U shape, and the height of the connection between the self-flow pipeline 230 and the first hot well 140 is lower than the height of the connection between the self-flow pipeline 230 and the second hot well 160. Based on this, by designing the U shape, the high-pressure side steam can be isolated to prevent the low-pressure side steam turbine back pressure from being affected in the case that the drain throttling valve 310 is not tightly sealed, and the liquid level of the first hot well 140 of the high-pressure side can be ensured. In this way, the stability of the system operation is ensured. Specifically, the U-shaped water seal height of the self-flow pipeline 230 is set to be not lower than the back pressure difference of the low-pressure cylinder of the high-pressure side and the low-pressure side.

[0045] As shown in Figure 1 In a feasible implementation, the heat supply unit system further includes a heat network circulation pipeline 240. The heat network circulation pipeline 240 first passes through the second condenser and then passes through the first condenser 130.

[0046] In the technical solution, the heat supply unit system can further include the heat network circulation pipeline 240. The water with a higher temperature in the heat network circulation pipeline 240 can be used to heat the residents. Since the first condenser 130 corresponds to the first steam turbine 110 with a higher pressure, and the second condenser corresponds to the second steam turbine 120 with a lower pressure, the temperature in the second condenser is lower than that in the first condenser 130. The water in the heat network circulation pipeline 240 is first heat-exchanged with the second condenser with a lower temperature and then heat-exchanged with the first condenser 130 with a higher temperature, so that the water in the heat network circulation pipeline 240 can be gradually heated, the heat energy utilization efficiency is higher, and the water output by the heat network circulation pipeline 240 can better heat the residents.

[0047] As shown in Figure 1As shown in the figure, in an implementable embodiment, the heat supply unit system further comprises: a first bypass pipeline 250 connected to the heat network circulation pipeline 240 in parallel with the first condenser 130; and a second bypass pipeline 260 connected to the heat network circulation pipeline 240 in parallel with the second condenser.

[0048] In the technical scheme, the heat supply unit system can further comprise the first bypass pipeline 250 and the second bypass pipeline 260. Through the first bypass pipeline 250, the heat network circulation pipeline 240 can not flow through the first condenser 130. Through the second bypass pipeline 260, the heat network circulation pipeline 240 can not flow through the second condenser. In the case that the liquid heat exchange in the heat network circulation pipeline 240 reaches the target temperature, the waste of heat energy can be avoided.

[0049] As shown in the figure, Figure 1 As shown in the figure, in an implementable embodiment, the heat supply unit system further comprises: a condensate water pipeline 270, one end of the condensate water pipeline 270 being communicated to the second heat well 160.

[0050] In the technical scheme, the heat supply unit system further comprises the condensate water pipeline 270. The first heat well 140 is used to collect the condensate water output via the first condenser 130. The second heat well 160 is used to collect the condensate water output via the second condenser 150. The condensate water in the first heat well 140 can be transported to the second heat well 160 by using the pressure difference. The second heat well 160 can output the condensate water through the condensate water pipeline 270 to realize the recycling use of the condensate water, and the energy saving is more.

[0051] As shown in the figure, Figure 1 As shown in the figure, in an implementable embodiment, the heat supply unit system further comprises: a condensate water pipeline 270, one end of the condensate water pipeline 270 being communicated to the second heat well 160.

[0052] In the technical scheme, the heat supply unit system can further comprise the condensate water pipeline 270 and the third waste heat utilization pipeline 280. The liquid with high temperature output via the peak heater can be supplied into the drain cooler 170. The condensate water pipeline 270 is further communicated to the drain cooler 170. The high-temperature liquid output via the peak heater can be heat-exchanged with the liquid output via the condensate water pipeline 270 in the drain cooler 170. The temperature of the condensate water can be increased. The initial temperature of the condensate water can be increased. The condensate water can be formed into high-temperature steam again to be used by the first steam turbine 110 and the second steam turbine 120. The waste heat of the liquid output via the peak heater can be utilized. The heat energy utilization efficiency can be further improved. The energy consumption can be reduced. The energy saving is more.

[0053] like Figure 1 As shown, in one feasible embodiment, the heating unit system further includes: a return water utilization pipeline 290, one end of which is connected to a condensate cooler 170 and the other end is connected to a first hot well 140, for supplying the liquid output from the peak heater that has completed waste heat utilization to the first hot well 140.

[0054] In this technical solution, the heating unit system may also include: a return water utilization pipeline 290, one end of which is connected to a condensate cooler 170 and the other end is connected to a first hot well 140. After the high-temperature liquid output from the peak heater completes heat exchange in the condensate cooler 170, it can be supplied to the first hot well 140 through the return water utilization pipeline 290, and then flow to the second hot well 160 by gravity, and then reused through the condensate pipe 270, which can further improve the resource reuse rate.

[0055] like Figure 1 As shown, in one feasible embodiment, the heating unit system further includes a condensate pressure reducing valve assembly 320, which is installed on the return water utilization pipeline 290 and is arranged closer to the first hot well 140 than the condensate cooler 170.

[0056] This technical solution further provides the structural composition of the heating unit system. The heating unit system may also include a condensate pressure reducing valve assembly 320 installed on the return water utilization pipeline 290. By setting the condensate pressure reducing valve assembly 320 and adjusting the opening of the condensate pressure reducing valve assembly 320, the pressure of the condensate pipeline before the valve can be maintained, avoiding vibration or damage to the return water utilization pipeline 290, and effectively reducing the risk of cavitation in the return water utilization pipeline 290.

[0057] In this technical solution, the condensate pressure reducing valve group 320 is arranged closer to the first hot well 140 than the condensate cooler 170. This arrangement can shorten the gas-water two-phase flow, avoid problems such as cavitation and vibration in the pipeline, and further ensure the stability of the system operation.

[0058] like Figure 1 As shown, in one feasible embodiment, the heating unit system further includes: a third bypass pipe 2100, which is connected to the third waste heat utilization pipe 280 and the return water utilization pipe 290, and is connected in parallel with the condensate cooler 170.

[0059] In this technical solution, the heating unit system may also include a third bypass pipeline 2100. When the temperature of the liquid output by the peak heater is low, the liquid output by the peak heater can be directly supplied to the first hot well 140 for reuse through the third waste heat utilization pipeline 280 and the return water utilization pipeline 290.

[0060] In the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0062] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A heating unit system, characterized in that, include: The first steam turbine and the second steam turbine, wherein the back pressure of the first steam turbine is greater than that of the second steam turbine; The first waste heat utilization pipeline, the first condenser and the first hot well, the first steam turbine, the first condenser and the first hot well are sequentially arranged on the first waste heat utilization pipeline; The second waste heat utilization pipeline, the second condenser, and the second hot well are sequentially arranged on the second waste heat utilization pipeline. A gravity flow pipeline is provided, which connects the first hot well and the second hot well.

2. The heating unit system according to claim 1, characterized in that, Also includes: A drain throttling valve is installed in the gravity flow pipeline.

3. The heating unit system according to claim 1, characterized in that, The gravity flow pipeline is U-shaped, and the height of the connection between the gravity flow pipeline and the first hot well is lower than the height of the connection between the gravity flow pipeline and the second hot well.

4. The heating unit system according to claim 1, characterized in that, Also includes: The heating network circulation pipeline first passes through the second condenser and then through the first condenser.

5. The heating unit system according to claim 4, characterized in that, Also includes: The first bypass pipeline is connected to the heating network circulation pipeline and is connected in parallel with the first condenser; The second bypass pipeline is connected to the heating network circulation pipeline and is connected in parallel with the second condenser.

6. The heating unit system according to any one of claims 1 to 5, characterized in that, Also includes: A condensate pipe, one end of which is connected to the second hot well.

7. The heating unit system according to claim 6, characterized in that, Also includes: A hydrophobic cooler, wherein the output end of the condensate pipe is connected to the hydrophobic cooler; A third waste heat utilization pipeline, which is connected to the hydrophobic cooler, is used to transport liquid output via the peak heater.

8. The heating unit system according to claim 7, characterized in that, Also includes: A return water utilization pipeline, one end of which is connected to the condensate cooler and the other end of which is connected to the first hot well, is used to supply the liquid output from the peak heater after waste heat utilization to the first hot well.

9. The heating unit system according to claim 8, characterized in that, Also includes: A condensate pressure reducing valve assembly is installed on the return water utilization pipeline and is arranged closer to the first hot well than the condensate cooler.

10. The heating unit system according to claim 8, characterized in that, Also includes: The third bypass pipeline is connected to the third waste heat utilization pipeline and the return water utilization pipeline, and is connected in parallel with the condensate cooler.

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