Middle exhaust steam extraction water spray heating system and method

Abstract

The present invention relates to the technical field of thermal power units, and in particular to a mid-exhaust steam extraction water spray heating system, comprising a medium-pressure cylinder, a low-pressure cylinder, a deaerator, a desuperheater and a heat exchanger, wherein the steam exhaust port of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam inlet and the water inlet of the desuperheater are respectively connected to the steam exhaust port of the medium-pressure cylinder and the outlet of the deaerator, the outlet of the desuperheater is connected to the hot end inlet of the heat exchanger, the hot end outlet of the heat exchanger is connected to the inlet of the deaerator, and the cold end inlet and the cold end outlet of the heat exchanger are respectively connected to the return water pipe of the heat network and the water supply pipe of the heat network. It also relates to a mid-exhaust steam extraction water spray heating method, which extracts steam discharged from the steam exhaust port of the medium-pressure cylinder, and mixes the extracted steam with the feed water discharged from the outlet of the deaerator in the desuperheater to reduce the temperature of the extracted steam, and then sends the mixed steam in the desuperheater to the heat exchanger for heat exchange with the return water of the heat network. It can improve the heat supply and economy.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power units, and in particular to a mid-exhaust steam extraction water spray heating system and a mid-exhaust steam extraction water spray heating method. Background Art

[0002] The improvement of the economic efficiency of thermal power units in steam extraction heating transformation is related to multiple factors such as steam extraction parameters, steam extraction volume, and steam extraction location. Under the premise of the same heating demand, selecting the most economical steam extraction scheme suitable for the unit is the focus of thermal system research.

[0003] Urban heating pipelines generally use liquid water as a heat medium, and the water temperature is below 150°C. The extraction parameters of thermal power units are higher than those required by the heating pipelines and cannot be used directly for heating. Therefore, a thermal power station is usually required to connect the extraction pipeline and the heating pipeline. The high-temperature and high-pressure steam in the extraction pipeline exchanges heat with the return water of the heating pipeline in the thermal power station. After the return water is heated, it is transported to the users of the heating network for use to achieve heating. The heat supply of this extraction heating method is limited by the maximum extraction volume that the heating steam pipeline (i.e., the extraction pipeline) can withstand. When the diameter of the heating steam pipeline is fixed, the maximum extraction volume of the heating steam pipeline is limited by the steam flow rate. The heat supply is therefore limited by the steam flow rate. Therefore, units that only extract the exhaust steam of the intermediate pressure cylinder for heating or use low-temperature cooling water for heating have the defect of insufficient system heating capacity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a mid-row extraction steam water spray heating system and a mid-row extraction steam water spray heating method, which can improve the heating amount and economy to overcome the above-mentioned defects of the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A medium-exhaust extraction steam water spray heating system comprises a medium-pressure cylinder, a low-pressure cylinder, a deaerator, a desuperheater and a heat exchanger, wherein the exhaust port of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam inlet and the water inlet of the desuperheater are respectively connected to the exhaust port of the medium-pressure cylinder and the outlet of the deaerator, the outlet of the desuperheater is connected to the hot end inlet of the heat exchanger, the hot end outlet of the heat exchanger is connected to the inlet of the deaerator, and the cold end inlet and the cold end outlet of the heat exchanger are respectively connected to the heat network return pipe and the heat network water supply pipe.

[0007] Preferably, the outlet of the deaerator is connected to the water inlet of the desuperheater via a water feed pump.

[0008] Preferably, the outlet of the water feed pump is connected to the water inlet of the desuperheater through a regulating valve.

[0009] Preferably, the hot end outlet of the heat exchanger is connected to the inlet of the deaerator through a drain pump.

[0010] Preferably, the heat network return pipe is connected to the cold end inlet of the heat exchanger through a heat network water circulation pump.

[0011] A method for heating by spraying water with steam from an intermediate-pressure cylinder is disclosed, wherein the steam discharged from the exhaust port of the intermediate-pressure cylinder is extracted, and the extracted steam is mixed with feed water discharged from the outlet of a deaerator in a desuperheater to reduce the temperature of the extracted steam, and then the mixed steam in the desuperheater is sent to a heat exchanger for heat exchange with return water from a heat network; the exhaust port of the intermediate-pressure cylinder is connected to the steam inlet of a low-pressure cylinder.

[0012] Compared with the prior art, the present invention has significant improvements:

[0013] Compared with the prior art in which the middle row extraction steam is directly sent to the heat exchange device through the heating steam pipeline for heat exchange with the return water of the heating network, the present invention first mixes the extracted intermediate pressure cylinder exhaust steam with the feed water discharged from the outlet of the deaerator in the desuperheater to form heating steam with a temperature lower than the temperature of the middle row extraction steam, and then sends the heating steam into the heat exchanger through the heating steam pipeline for heat exchange with the return water of the heating network to heat the return water of the heating network, and uses the feed water discharged from the outlet of the deaerator to reduce the temperature of the middle row extraction steam. On the one hand, the heating steam temperature in the heating steam pipeline is reduced, the steam flow rate per unit heating amount is reduced, the maximum steam extraction amount is increased, and the heating amount to the heat exchanger can be increased, that is, the heating amount is increased. The amount of heat supplied to the users of the heating network has improved the heating capacity of the system, reduced the operating parameters of the equipment, and reduced the economic investment in equipment construction; on the other hand, since the temperature of the feed water discharged from the deaerator outlet is higher than the return water temperature discharged from the drainage outlet of the heating network users, the feed water at the deaerator outlet is mixed with the intermediate exhaust steam to form heating steam, which is equivalent to adding the feed water at the deaerator outlet as a heating heat source. The feed water at the deaerator outlet and the intermediate exhaust steam jointly supply heat to the heat exchanger to heat the return water of the heating network. Therefore, the actual steam extraction amount of the intermediate pressure cylinder exhaust can be reduced, the steam work loss can be reduced, the unit efficiency can be increased, and the overall economy of the system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a simplified schematic diagram of the structure of the middle exhaust steam spray water heating system of an embodiment of the present invention.

[0015] The reference numerals are described as follows:

[0016] 1. Intermediate pressure cylinder 1a. Exhaust port of intermediate pressure cylinder

[0017] 2. Low-pressure cylinder 2a. Steam inlet of low-pressure cylinder

[0018] 2b. Exhaust port of low pressure cylinder 3. Deaerator

[0019] 3a. Inlet of deaerator 3b. Outlet of deaerator

[0020] 4. Desuperheater 4a. Steam inlet of desuperheater

[0021] 4b, water inlet of desuperheater 4c, outlet of desuperheater

[0022] 5. Heat exchanger 5a. Hot end inlet of heat exchanger

[0023] 5b, hot end outlet of heat exchanger 5c, cold end inlet of heat exchanger

[0024] 5d. Cold end outlet of heat exchanger 6. High pressure cylinder

[0025] 7. Heat network return pipe 8. Heat network water supply pipe

[0026] 9. Water supply pump 9a. Inlet of water supply pump

[0027] 9b. Water supply pump outlet 10. Drain pump

[0028] 10a, Drain pump inlet 10b, Drain pump outlet

[0029] 11. Heating network water circulation pump 11a. Inlet of heating network water circulation pump

[0030] 11b. Outlet of the heating network water circulation pump DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0035] like Figure 1 As shown, an embodiment of the present invention provides a middle row steam extraction water spray heating system. The middle row steam extraction water spray heating system of this embodiment includes a middle pressure cylinder 1, a low pressure cylinder 2, a deaerator 3, a desuperheater 4 and a heat exchanger 5. In addition, the middle row steam extraction water spray heating system of this embodiment may also include a boiler (not shown in the figure), a high pressure cylinder 6 and a condenser (not shown in the figure).

[0036] Among them, the steam outlet of the boiler is connected to the steam inlet of the high-pressure cylinder 6, the exhaust port of the high-pressure cylinder 6 is connected to the reheat steam inlet of the boiler, the reheat steam outlet of the boiler is connected to the steam inlet of the intermediate-pressure cylinder 1, the exhaust port 1a of the intermediate-pressure cylinder 1 is connected to the steam inlet 2a of the low-pressure cylinder 2, and the exhaust port 2b of the low-pressure cylinder 2 is connected to the inlet 3a of the deaerator 3 through the condenser, that is, the exhaust port of the low-pressure cylinder 2 is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet 3a of the deaerator 3, and the outlet 3b of the deaerator 3 is connected to the inlet of the boiler. The high-temperature and high-pressure steam in the boiler is passed from the steam outlet of the boiler into the steam inlet of the high-pressure cylinder 6, enters the high-pressure cylinder 6 to do work, the steam after doing work in the high-pressure cylinder 6 is discharged from the exhaust port of the high-pressure cylinder 6 and passed into the reheat steam inlet of the boiler, enters the boiler for reheating and temperature increase, and then passes from the reheat steam outlet of the boiler into the steam inlet of the intermediate-pressure cylinder 1, enters the intermediate-pressure cylinder 1 to do work, the steam after doing work in the intermediate-pressure cylinder 1 is discharged from the exhaust port 1a of the intermediate-pressure cylinder 1 and passed into the steam inlet 2a of the low-pressure cylinder 2, enters the low-pressure cylinder 2 to do work, the steam after doing work in the low-pressure cylinder 2 is discharged from the exhaust port of the low-pressure cylinder 2 and passed into the inlet of the condenser, enters the condenser to condense into water, the condensed water in the condenser is discharged from the outlet of the condenser and passed into the inlet 3a of the deaerator 3, enters the deaerator 3 for deoxygenation, the deoxygenated water in the deaerator 3 is discharged from the outlet 3b of the deaerator 3 and passed into the inlet of the boiler, and enters the boiler as boiler feed water.

[0037] The desuperheater 4 has a steam inlet 4a, a water inlet 4b and an outlet 4c. The steam inlet 4a of the desuperheater 4 is connected to the exhaust port 1a of the intermediate pressure cylinder 1, so that part of the exhaust steam of the intermediate pressure cylinder 1 enters the desuperheater 4 as extraction steam, that is, the intermediate exhaust extraction steam passes into the desuperheater 4 through the extraction steam pipeline. The water inlet 4b of the desuperheater 4 is connected to the outlet 3b of the deaerator 3, so that part of the feed water discharged from the outlet 3b of the deaerator 3 passes into the desuperheater 4. The intermediate row extraction steam introduced into the desuperheater 4 and the feed water at the outlet 3b of the deaerator 3 are mixed in the desuperheater 4. Since the temperature of the feed water discharged from the outlet 3b of the deaerator 3 is lower than the exhaust temperature of the intermediate pressure cylinder 1, the feed water in the desuperheater 4 will reduce the temperature of the intermediate row extraction steam after mixing with the intermediate row extraction steam, and the feed water absorbs the heat of the intermediate row extraction steam and evaporates into water vapor, which is mixed with the intermediate row extraction steam to form heating steam, and the heating steam is discharged from the outlet 4c of the desuperheater 4.

[0038] The heat exchanger 5 has a hot end inlet 5a, a hot end outlet 5b, a cold end inlet 5c and a cold end outlet 5d. The hot end inlet 5a of the heat exchanger 5 is connected to the hot end outlet 5b to form a hot end channel, and the cold end inlet 5c of the heat exchanger 5 is connected to the cold end outlet 5d to form a cold end channel. The outlet 4c of the desuperheater 4 is connected to the hot end inlet 5a of the heat exchanger 5, the hot end outlet 5b of the heat exchanger 5 is connected to the inlet 3a of the deaerator 3, the cold end inlet 5c of the heat exchanger 5 is connected to the heat network return pipe 7, the heat network return pipe 7 is connected to the heat network user drain port, and the cold end outlet 5d of the heat exchanger 5 is connected to the heat network water supply pipe 8, and the heat network water supply pipe 8 is connected to the heat network user water inlet. The heating steam discharged from the outlet 4c of the desuperheater 4 enters from the hot end inlet 5a of the heat exchanger 5 and flows through the hot end channel of the heat exchanger 5. The connecting pipe between the outlet 4c of the desuperheater 4 and the hot end inlet 5a of the heat exchanger 5 is the heating steam pipe; the return water discharged from the drainage outlet of the heating network user is sent to the return water pipe 7 of the heating network. The return water in the return water pipe 7 of the heating network enters from the cold end inlet 5c of the heat exchanger 5 and flows through the cold end channel of the heat exchanger 5. The heating steam and the return water exchange heat when flowing through the hot end channel and the cold end channel of the heat exchanger 5 respectively, and release and absorb heat respectively. After releasing heat, the heating steam condenses into water, which is discharged from the hot end outlet 5b of the heat exchanger 5 and passed into the inlet 3a of the deaerator 3. After being sent to the deaerator 3 for deoxygenation, it is also discharged from the outlet 3b of the deaerator 3 as feed water. After absorbing heat, the return water is heated up to the required temperature of the heating network, and then discharged from the cold end outlet 5d of the heat exchanger 5 and passed into the heating network water supply pipe 8, and then sent to the water inlet of the heating network user for use.

[0039] Compared with the prior art in which the middle row extraction steam is directly sent to the heat exchange device through the heating steam pipeline for heat exchange with the return water of the heating network, the middle row extraction steam water spray heating system of this embodiment first mixes the extracted intermediate pressure cylinder 1 exhaust steam and the feed water discharged from the outlet 3b of the deaerator 3 in the desuperheater 4 to form heating steam with a temperature lower than the temperature of the middle row extraction steam, and then sends the heating steam to the heat exchanger 5 through the heating steam pipeline for heat exchange with the return water of the heating network to heat the return water of the heating network, and uses the feed water discharged from the outlet 3b of the deaerator 3 to reduce the temperature of the middle row extraction steam. On the one hand, the heating steam temperature in the heating steam pipeline is reduced, the steam flow rate per unit heating amount is reduced, the maximum steam extraction amount is increased, and the heating amount to the heat exchanger 5 can be increased. , that is, increasing the amount of heat supplied to the users of the heat network, thereby improving the heating capacity of the system, reducing the working parameters of the equipment, and reducing the economic investment in equipment construction; on the other hand, since the temperature of the feed water discharged from the outlet 3b of the deaerator 3 is higher than the return water temperature discharged from the outlet of the heat network user, the feed water from the outlet 3b of the deaerator 3 is mixed with the middle exhaust steam to form heating steam, which is equivalent to adding the feed water from the outlet 3b of the deaerator 3 as a heating source, and the feed water from the outlet 3b of the deaerator 3 and the middle exhaust steam jointly supply heat to the heat exchanger 5 to heat the return water of the heat network, so the actual steam extraction amount of the exhaust steam of the intermediate pressure cylinder 1 can be reduced, the steam work loss can be reduced, the unit efficiency can be increased, and the overall economy of the system can be improved. The middle exhaust steam extraction water spray heating system of this embodiment has the advantages of good heating capacity and economy, reasonable structure, reliable system, and high equipment safety.

[0040] In the present embodiment, preferably, the feed water at the outlet 3b of the deaerator 3 is passed into the desuperheater 4 and mixed with the middle exhaust steam passed into the desuperheater 4 by spraying the feed water on the middle exhaust steam. The spraying method can make the middle exhaust steam passed into the desuperheater 4 and the feed water at the outlet 3b of the deaerator 3 fully mixed in the desuperheater 4, thereby effectively reducing the temperature of the middle exhaust steam.

[0041] In this embodiment, preferably, the outlet 3b of the deaerator 3 can be connected to the water inlet 4b of the desuperheater 4 through the feed water pump 9. The inlet 9a of the feed water pump 9 is connected to the outlet 3b of the deaerator 3, and the outlet 9b of the feed water pump 9 is simultaneously connected to the inlet of the boiler and the water inlet 4b of the desuperheater 4. The feed water discharged from the outlet 3b of the deaerator 3 is transported to the boiler and the desuperheater 4 in two ways under the action of the feed water pump 9.

[0042] In this embodiment, preferably, the outlet 9b of the feed water pump 9 is connected to the water inlet 4b of the desuperheater 4 through a regulating valve (not shown in the figure). The regulating valve is arranged on the pipeline connecting the outlet 9b of the feed water pump 9 and the water inlet 4b of the desuperheater 4, and is used to adjust the amount of feed water sent into the desuperheater 4, that is, to adjust the amount of water sprayed in the desuperheater 4. By adjusting the amount of water sprayed in the desuperheater 4, the parameters of the heating steam formed by mixing the exhaust steam and the feed water at the outlet 3b of the deaerator 3 can be adjusted, so that the parameters of the hot working medium entering the heat exchanger 5 can be adjusted more flexibly.

[0043] In this embodiment, preferably, the hot end outlet 5b of the heat exchanger 5 is connected to the inlet 3a of the deaerator 3 through the drain pump 10. The inlet 10a of the drain pump 10 is connected to the hot end outlet 5b of the heat exchanger 5, and the outlet 10b of the drain pump 10 is connected to the inlet 3a of the deaerator 3. The condensate discharged from the hot end outlet 5b of the heat exchanger 5 is transported to the deaerator 3 under the action of the drain pump 10.

[0044] In this embodiment, preferably, the heat network return water pipe 7 is connected to the cold end inlet 5c of the heat exchanger 5 through the heat network water circulation pump 11. The inlet 11a of the heat network water circulation pump 11 is connected to the outlet of the heat network return water pipe 7, and the outlet 11b of the heat network water circulation pump 11 is connected to the cold end inlet 5c of the heat exchanger 5. The heat network return water in the heat network return water pipe 7 is transported to the heat exchanger 5 under the action of the heat network water circulation pump 11.

[0045] like Figure 1 As shown, the embodiment of the present invention also provides a method for heating by spraying water through a middle exhaust steam extraction. The method for heating by spraying water through a middle exhaust steam extraction of the present embodiment can be implemented by the above-mentioned system for heating by spraying water through a middle exhaust steam extraction. Specifically, the method for heating by spraying water through a middle exhaust steam extraction of the present embodiment is as follows: extract the steam discharged from the exhaust port 1a of the intermediate pressure cylinder 1, and mix the extracted steam with the feed water discharged from the outlet 3b of the deaerator 3 in the desuperheater 4, so that the temperature of the extracted steam is reduced, and then the mixed steam in the desuperheater 4 is sent to the heat exchanger 5 through the heating steam pipeline to exchange heat with the return water of the heating network, heat the return water of the heating network, and the return water of the heating network heated in the desuperheater 4 is sent to the water inlet of the heating network user for use, and the steam after heat exchange in the desuperheater 4 is condensed into water and sent to the inlet 3a of the deaerator 3. Among them, the exhaust port 1a of the intermediate pressure cylinder 1 is connected to the steam inlet 2a of the low pressure cylinder 2, and the exhaust port 2b of the low pressure cylinder 2 is connected to the inlet 3a of the deaerator 3.

[0046] Compared with the prior art in which the middle row extraction steam is directly sent to the heat exchange device through the heating steam pipeline for heat exchange with the return water of the heating network, the middle row extraction steam water spray heating method of this embodiment first mixes the extracted middle pressure cylinder 1 exhaust steam and the feed water discharged from the outlet 3b of the deaerator 3 in the desuperheater 4 to form heating steam with a temperature lower than the middle row extraction steam temperature, and then sends the heating steam to the heat exchanger 5 through the heating steam pipeline for heat exchange with the return water of the heating network to heat the return water of the heating network, and uses the feed water discharged from the outlet 3b of the deaerator 3 to reduce the temperature of the middle row extraction steam. On the one hand, the heating steam temperature in the heating steam pipeline is reduced, the steam flow rate per unit heating amount is reduced, the maximum steam extraction amount is increased, and the heating amount to the heat exchanger 5 can be increased. , that is, increasing the amount of heat supplied to the users of the heat network, thereby improving the heating capacity of the system, reducing the operating parameters of the equipment, and reducing the economic investment in equipment construction; on the other hand, since the temperature of the feed water discharged from the outlet 3b of the deaerator 3 is higher than the return water temperature discharged from the outlet of the heat network user, the feed water at the outlet 3b of the deaerator 3 is mixed with the middle row extraction steam to form heating steam, which is equivalent to adding the feed water at the outlet 3b of the deaerator 3 as a heating heat source, and the feed water at the outlet 3b of the deaerator 3 and the middle row extraction steam jointly supply heat to the heat exchanger 5 to heat the return water of the heat network, so the actual extraction amount of the exhaust steam of the intermediate pressure cylinder 1 can be reduced, the steam work loss can be reduced, the unit efficiency can be increased, and the overall economy of the system can be improved.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A mid-exhaust steam extraction water spray heating system, characterized in that: The invention comprises a medium-pressure cylinder (1), a low-pressure cylinder (2), a deaerator (3), a desuperheater (4) and a heat exchanger (5), wherein the steam exhaust port (1a) of the medium-pressure cylinder (1) is connected to the steam inlet (2a) of the low-pressure cylinder (2), the steam inlet (4a) and the water inlet (4b) of the desuperheater (4) are respectively connected to the steam exhaust port (1a) of the medium-pressure cylinder (1) and the outlet (3b) of the deaerator (3), and the outlet (3b) of the deaerator (3) is fed with water into the desuperheater (5). The method for mixing the middle exhaust steam in the superheater (4) with the middle exhaust steam introduced into the desuperheater (4) is to spray the middle exhaust steam with water, the outlet (4c) of the desuperheater (4) is connected to the hot end inlet (5a) of the heat exchanger (5), the hot end outlet (5b) of the heat exchanger (5) is connected to the inlet (3a) of the deaerator (3), and the cold end inlet (5c) and the cold end outlet (5d) of the heat exchanger (5) are respectively connected to the heat network return pipe (7) and the heat network supply pipe (8).

2. The central exhaust steam spray water heating system according to claim 1 is characterized in that: The outlet (3b) of the deaerator (3) is connected to the water inlet (4b) of the desuperheater (4) via a water feed pump (9).

3. The central exhaust steam spray water heating system according to claim 2 is characterized in that: The outlet (9b) of the water supply pump (9) is connected to the water inlet (4b) of the desuperheater (4) via a regulating valve.

4. The central exhaust steam spray water heating system according to claim 1 is characterized in that: The hot end outlet (5b) of the heat exchanger (5) is connected to the inlet (3a) of the deaerator (3) via a drain pump (10).

5. The central exhaust steam spray water heating system according to claim 1 is characterized in that: The heat network return water pipe (7) is connected to the cold end inlet (5c) of the heat exchanger (5) via a heat network water circulation pump (11).

6. A method for heating by spraying water with steam from a middle exhaust, characterized in that: Steam discharged from the exhaust port (1a) of the intermediate pressure cylinder (1) is extracted, and the extracted steam is mixed with feed water discharged from the outlet (3b) of the deaerator (3) in a desuperheater (4); the feed water at the outlet (3b) of the deaerator (3) is introduced into the desuperheater (4) and mixed with the intermediate exhaust steam introduced into the desuperheater (4) by spraying the feed water on the intermediate exhaust steam to reduce the temperature of the extracted steam; the mixed steam in the desuperheater (4) is then sent to a heat exchanger (5) for heat exchange with return water from the heat network; the exhaust port (1a) of the intermediate pressure cylinder (1) is connected to the steam inlet (2a) of the low pressure cylinder (2).

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