Backpressure steam optimized utilization system and method of backpressure steam turbine

Abstract

The invention relates to the technical field of steam utilization of back pressure steam turbines, in particular to a back pressure steam optimized utilization system and method of a back pressure steam turbine. A secondary machine is installed after steam exhaust of the back pressure steam turbine, power generated by the secondary machine is used for supplying auxiliary power, and extracted steam and exhausted steam of the secondary machine are used for heating; steam of the secondary machine is condensed into water in the heater to serve as feed water, and heat energy is fully utilized; and water condensed by steam of the back pressure turbine in the heater is also used as feed water, so that heat energy is fully utilized. Heat energy is fully utilized, and the problems that a back pressure turbine is unreasonable in steam heat energy utilization and low in energy efficiency are solved.

Description

Technical Field

[0001] The invention relates to the technical field of back-pressure steam turbine steam utilization, and in particular to a back-pressure steam optimization utilization system and method for a back-pressure steam turbine. Background Art

[0002] With the development of the economy, the heating area and heat supply are constantly increasing, and energy conservation and emission reduction in heating are increasingly valued. Under the requirements of carbon peak and carbon neutrality, work in this regard is more urgent. Back-pressure heating is currently the most commonly used heating method, and with the gradual shutdown of small-capacity units with high energy consumption and serious pollution, its application scope will be further expanded. At present, the feed water heating of most back-pressure steam turbine units has the problem of using high-parameter steam to heat low-parameter feed water. Some even reduce the steam parameters through cooling and pressure reduction devices and then heat the feed water. The utilization of thermal energy is not reasonable, which affects energy efficiency. Summary of the invention

[0003] The object of the present invention is to provide a system and method for optimizing the utilization of back-pressure steam of a back-pressure steam turbine.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention proposes a method for optimizing the utilization of back-pressure steam of a back-pressure steam turbine, wherein a secondary machine is installed to provide steam from the exhaust steam of the back-pressure steam turbine, and a secondary generator is correspondingly arranged on the secondary machine, and the electricity generated by the secondary machine is used for factory electricity;

[0006] The secondary machine is used to preliminarily heat the feed water, and the preliminarily heated feed water enters the deaerator, and then the back pressure steam turbine is used to reheat the feed water passing through the deaerator;

[0007] In the case where the extraction steam parameter of the secondary machine is not higher than the deaerator steam temperature of the deaerator, the extraction steam and exhaust steam of the secondary machine are used to heat the feed water that has not passed through the deaerator, the exhaust steam of the back-pressure steam turbine is used for low-pressure heating and heating the deaerator, and the extraction steam of the back-pressure steam turbine is used to heat the feed water after passing through the deaerator;

[0008] When the extraction steam parameters of the secondary machine are higher than the deoxygenated steam temperature of the deaerator, the exhaust steam of the secondary machine is used to heat the feed water that has not passed through the deaerator, and the extraction steam of the secondary machine is used to heat the deaerator. The extraction steam and exhaust steam of the back-pressure steam turbine are used to heat the feed water that passes through the deaerator, and the exhaust steam of the back-pressure steam turbine is also used for low-pressure heating.

[0009] Furthermore, the inlet steam parameter of the secondary machine is a full load parameter or a rated parameter of the exhaust steam of the back pressure steam turbine.

[0010] Furthermore, the steam condensate after the back-pressure steam turbine heats the feed water enters the deaerator and serves as the feed water.

[0011] Furthermore, when the extraction steam parameters of the secondary machine are not higher than the deoxygenated steam temperature of the deaerator, the exhaust steam and extraction steam of the secondary machine heat the feed water that has not passed through the deaerator through the heater, and the condensate of the high-pressure heater connected to the secondary machine is discharged to the low-pressure heater.

[0012] Furthermore, the secondary machine is one of a steam turbine and a screw expander.

[0013] Furthermore, an artificial neural network is used to evaluate the economy under parameter operation, so as to confirm the type of the regulating valve of the back-pressure steam turbine; the types of the regulating valve include single valves and sequential valves; the artificial neural network includes one of a BP neural network and a Hopfield neural network; the parameters include inlet flow, electric power, steam inlet temperature, steam inlet pressure, back pressure, medium-pressure steam supply flow, low-pressure steam supply flow, and single valve or sequential valve.

[0014] The present invention also includes an optimization utilization system using any of the above-mentioned back-pressure steam optimization utilization methods, comprising a back-pressure steam turbine, a secondary machine that provides steam from the exhaust steam of the back-pressure steam turbine, a first heater, a second heater, and a deaerator; the back-pressure steam turbine is correspondingly provided with a main generator, and the secondary machine is correspondingly provided with a secondary generator;

[0015] In the case where the extraction parameter of the secondary machine is not higher than the deoxygenated steam temperature of the deaerator, a third heater and a final-stage heater are also included; the exhaust port of the secondary machine is connected to the steam inlet of the final-stage heater, the extraction port of the secondary machine is connected to the steam inlet of the third heater, the secondary extraction port of the back-pressure steam turbine is connected to the steam inlet of the second heater, the primary extraction port of the back-pressure steam turbine is connected to the steam inlet of the first heater, the exhaust port of the back-pressure steam turbine is connected to the steam inlet of the deaerator, and the exhaust port of the back-pressure steam turbine is also connected to a low-pressure heating pipeline; the inlet of the final-stage heater is connected to a feed water pipeline, the outlet of the final-stage heater is connected to the inlet of the third heater, and the outlet of the third heater is connected to the water inlet of the deaerator; the water outlet of the deaerator is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the first heater, and the outlet of the first heater is connected to a feed water pipeline;

[0016] When the extraction parameters of the secondary machine are higher than the deoxygenated steam temperature of the deaerator, a hybrid heater is also included, wherein the exhaust port of the secondary machine is connected to the steam inlet of the hybrid heater, the extraction port of the secondary machine is connected to the steam inlet of the deaerator, the exhaust port of the back-pressure steam turbine is connected to the steam inlet of the second heater, the secondary extraction port of the back-pressure steam turbine is connected to the steam inlet of the first heater, and the exhaust port of the back-pressure steam turbine is also connected to a low-pressure heating pipeline; the inlet of the hybrid heater is connected to a feed water pipeline, the outlet of the hybrid heater is connected to the water inlet of the deaerator, the water outlet of the deaerator is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the first heater, and the outlet of the first heater is connected to the feed water pipeline.

[0017] Furthermore, the first heater, the second heater and the third heater are all surface heaters; the final heater is one of a surface heater and a hybrid heater; a drain pipe is connected between the third heater and the final heater;

[0018] When the final stage heater is a surface heater, the drain pipe extends outward to be connected to one of the water inlet or the feed water pipeline of the deaerator; a first water control regulating valve is arranged on the drain pipe between the third heater and the final stage heater, and a second water control regulating valve and a condensate pump are arranged in sequence on the extended part of the drain pipe.

[0019] When the final-stage heater is a hybrid heater, a first relay water pump is further provided between the outlet of the final-stage heater and the inlet of the third heater.

[0020] Further, the final stage heater is installed at the operating layer of the back pressure steam turbine;

[0021] When the final stage heater is a surface heater, the condensate pump is installed at the 0-meter layer;

[0022] When the final-stage heater is a hybrid heater, the first relay water pump is installed at the 0-meter layer.

[0023] Furthermore, the steam condensate outlets of the first heater and the second heater are connected to the inlet of the deaerator.

[0024] Compared with the prior art, the present invention installs a secondary machine after the exhaust steam of the back-pressure steam turbine, uses the power generation of the secondary machine to supply power to the plant, uses the extraction and exhaust steam of the secondary machine for heating, and uses the water condensed from the steam of the secondary machine in the heater as feed water, making full use of thermal energy; the water condensed from the steam of the back-pressure steam turbine in the heater is also used as feed water, making full use of thermal energy. The present invention makes full use of thermal energy and solves the problems of unreasonable utilization of steam thermal energy and low energy efficiency of back-pressure steam turbines.

[0025] Instruction Manual

[0026] Figure 1 It is a schematic diagram of the connection of the system of the present invention when the extraction steam parameter of the secondary machine is not higher than the deoxygenated steam temperature of the deaerator and the final stage heater is a surface heater.

[0027] Figure 2 It is a schematic diagram of the connection of the system of the present invention when the extraction steam parameter of the secondary machine is not higher than the deoxygenated steam temperature of the deaerator and the final stage heater is a hybrid heater.

[0028] Figure 3 It is a schematic diagram of the connection of the system of the present invention when the extraction steam parameter of the secondary machine is higher than the deoxygenation steam temperature of the deaerator.

[0029] The arrows in the figure indicate the direction of material flow in the pipeline.

[0030] In the figure, 1-back pressure steam turbine; 2-main generator; 3-secondary machine; 4-secondary generator; 5-first heater; 6-second heater; 7-third heater; 8-final heater; 9-deaerator; 10-mixed heater; 11-first water control regulating valve; 12-second water control regulating valve; 13-condensate pump; 14-first relay water pump; 15-low pressure heating pipeline; 16-feed water pipeline; 17-feed water pipeline; 18-drain pipe; 19-second relay water pump; 20-feed water pump. DETAILED DESCRIPTION

[0031] The technical scheme of the present invention is further described below in conjunction with specific examples. It should be understood that the following examples are only exemplary descriptions and explanations of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0032] In one embodiment of the present invention, a method for optimizing the utilization of back-pressure steam of a back-pressure steam turbine is provided, wherein a secondary machine is installed to provide steam from exhaust steam of the back-pressure steam turbine, a secondary generator is provided corresponding to the secondary machine, and the electricity generated by the secondary machine is used for factory electricity;

[0033] The secondary machine is used to preliminarily heat the feed water, and the preliminarily heated feed water enters the deaerator, and then the back-pressure steam turbine is used to reheat the feed water passing through the deaerator;

[0034] When the extraction parameters of the secondary machine are not higher than the deaerator steam temperature of the deaerator, the extraction and exhaust steam of the secondary machine are used to heat the feed water that has not passed through the deaerator, and the exhaust steam of the back-pressure steam turbine is also used for low-pressure heating and heating the deaerator. The extraction steam of the back-pressure steam turbine is used to heat the feed water after passing through the deaerator; the feed water enters the deaerator after being heated. In this case, the amount of steam used to heat the deaerator by the exhaust steam of the back-pressure steam turbine is reduced, and part of the exhaust steam of the back-pressure steam turbine enters the secondary machine, and the total exhaust steam of the back-pressure steam turbine increases. The selection of the secondary machine extraction parameters is obtained by the optimization calculation of the thermal system;

[0035] When the extraction steam parameters of the secondary machine are higher than the deoxygenated steam temperature of the deaerator, the exhaust steam of the secondary machine is used to heat the feed water that has not passed through the deaerator, and the extraction steam of the secondary machine is used to heat the deaerator. The extraction steam and exhaust steam of the back-pressure steam turbine are used to heat the feed water that passes through the deaerator, and the exhaust steam of the back-pressure steam turbine is also used for low-pressure heating.

[0036] In one embodiment of the present invention, the inlet steam parameter of the secondary machine is the full load parameter or rated parameter of the exhaust steam of the back pressure steam turbine; it is possible to maintain a high operating efficiency of the thermal system and achieve a better energy saving effect.

[0037] In one embodiment of the present invention, the steam condensed water after the back-pressure steam turbine heats the feed water enters the deaerator and serves as the feed water, thereby fully utilizing the thermal energy.

[0038] In one embodiment of the present invention, when the extraction steam parameters of the secondary machine are not higher than the deoxygenated steam temperature of the deaerator, the exhaust steam and extraction steam of the secondary machine heat the feed water that has not passed through the deaerator through the heater, and the condensate of the high-pressure heater connected to the secondary machine is discharged to the low-pressure heater.

[0039] In one embodiment of the present invention, the secondary machine is one of a steam turbine and a screw expander.

[0040] In the above embodiment, the secondary machine is a screw expander; the screw expander can operate under wet steam. The application of the screw expander increases the flow rate of the main steam, improves the efficiency and load rate of the back-pressure steam turbine, and at the same time, the application of the screw expander increases the power generation of the secondary machine and improves the utilization rate of steam, that is, improves the efficiency of the thermal system; because the exhaust steam of the screw expander is wet steam, wet steam heating requires a larger mass flow rate than superheated steam heating, which provides conditions for improving the efficiency and optimization of the thermal system.

[0041] In one embodiment of the present invention, an artificial neural network is used to evaluate the economy under parameter operation, so as to confirm the type of the regulating valve of the back-pressure steam turbine; the types of the regulating valve include single valves and sequential valves; the artificial neural network includes one of a BP neural network and a Hopfield neural network; the parameters include inlet flow, electric power, steam inlet temperature, steam inlet pressure, back pressure, medium-pressure steam supply flow, low-pressure steam supply flow, and a single valve or a sequential valve.

[0042] See also Figure 1 and Figure 3 In one embodiment of the present invention, an optimization utilization system using any of the above-mentioned back-pressure steam optimization utilization methods includes a back-pressure steam turbine 1, a secondary machine 3 that provides steam from the exhaust steam of the back-pressure steam turbine 1, a first heater 5, a second heater 6, and a deaerator 9; the back-pressure steam turbine 1 is correspondingly provided with a main generator 2, and the secondary machine is correspondingly provided with a secondary generator 4;

[0043] In the case where the extraction parameters of the secondary machine 3 are not higher than the deoxygenated steam temperature of the deaerator 9, a third heater 7 and a final stage heater 8 are also included; the exhaust port of the secondary machine 3 is connected to the steam inlet of the final stage heater 8, the extraction port of the secondary machine 3 is connected to the steam inlet of the third heater 7, the secondary extraction port of the back-pressure steam turbine 1 is connected to the steam inlet of the second heater 6, the primary extraction port of the back-pressure steam turbine 1 is connected to the steam inlet of the first heater 5, and the exhaust port of the back-pressure steam turbine 1 is connected to the The steam inlet of the deaerator 9 and the exhaust port of the back-pressure steam turbine 1 are also connected to a low-pressure heating pipeline 15; the inlet of the final-stage heater 8 is connected to a feed water pipeline 16, the outlet of the final-stage heater 8 is connected to the inlet of the third heater 7, and the outlet of the third heater 7 is connected to the water inlet of the deaerator 9; the water outlet of the deaerator 9 is connected to the inlet of the second heater 6, the outlet of the second heater 6 is connected to the inlet of the first heater 5, and the outlet of the first heater 5 is connected to the feed water pipeline 17;

[0044] When the steam extraction parameter of the secondary machine 3 is higher than the deoxygenated steam temperature of the deaerator 9, a hybrid heater 10 is also included, the exhaust port of the secondary machine 3 is connected to the steam inlet of the hybrid heater 10, the steam extraction port of the secondary machine 3 is connected to the steam inlet of the deaerator 9, the exhaust port of the back-pressure steam turbine 1 is connected to the steam inlet of the second heater 6, the secondary steam extraction port of the back-pressure steam turbine 1 is connected to the steam inlet of the first heater 5, and the exhaust port of the back-pressure steam turbine 1 is also connected to a low-pressure heating pipe 15; the inlet of the hybrid heater 10 is connected to a feed water pipe 16, the outlet of the hybrid heater 10 is connected to the water inlet of the deaerator 9, the water outlet of the deaerator 9 is connected to the inlet of the second heater 6, the outlet of the second heater 6 is connected to the inlet of the first heater 5, and the outlet of the first heater 5 is connected to a feed water pipe 17.

[0045] See also Figure 3 In the above embodiment, a second relay water pump 19 is further provided between the outlet of the hybrid heater 10 and the water inlet of the deaerator 9 to control the water level.

[0046] Please continue reading Figure 3 In the above embodiment, a water feed pump 20 is further provided between the water outlet of the deaerator 9 and the inlet of the second heater 6 so as to control the water level.

[0047] In one embodiment of the present invention, the exhaust steam pressure of the secondary machine is 60-30 kPa; under such pressure, a relatively small heater can be used to condense the steam into water.

[0048] In the above embodiment, the final stage heater is equipped with a water jet steam extractor.

[0049] See also Figure 1 and Figure 2 In one embodiment of the present invention, the first heater 5, the second heater 6 and the third heater 7 are all surface heaters; the final heater 8 is a surface heater and a hybrid heater; a drain pipe 18 is connected between the third heater 7 and the final heater 8;

[0050] When the final stage heater 8 is a surface heater, the drain pipe extends outward to be connected to one of the water inlet of the deaerator 9 or the feed water pipeline 16; the drain pipe 18 between the third heater 7 and the final stage heater 8 is provided with a first water control regulating valve 11, and the extended part of the drain pipe 18 is provided with a second water control regulating valve 12 and a condensate pump 13 in sequence; the water control regulating valve is used to adjust the water level when draining backward; the condensate pump is used to control the water level;

[0051] When the final-stage heater 8 is a hybrid heater, a first relay water pump 14 is further provided between the outlet of the final-stage heater 8 and the inlet of the third heater 7 .

[0052] In the above embodiment, the final stage heater is installed at the operating layer of the back pressure steam turbine;

[0053] When the final stage heater is a surface heater, the condensate pump is installed at the 0-meter layer;

[0054] When the final stage heater is a hybrid heater, the first relay water pump is installed at the 0m layer.

[0055] To increase the inlet pressure of the condensate test pump or the first relay water pump to ensure that water is not vaporized during operation.

[0056] See also Figure 1 or Figure 3 In one embodiment of the present invention, the steam condensate outlets of the first heater 5 and the second heater 6 are connected to the inlet of the deaerator 9 .

[0057] When the extraction parameters of the secondary machine are not higher than the deoxygenated steam temperature of the deaerator, part of the exhaust steam of the back-pressure steam turbine enters the secondary machine, and the feed water enters from the feed water pipeline, and is heated step by step through the final-stage heater, the third heater, the deaerator, the second heater and the first heater in sequence, and then output from the feed water pipeline. The final-stage heater and the third heater are both provided with thermal energy by the steam of the secondary machine, and the condensed water after the steam is condensed enters from the feed water pipeline as feed water; the second heater and the first heater are provided with thermal energy by the steam of the back-pressure steam turbine, and the condensed water after the steam is condensed enters the deaerator as feed water.

[0058] When the extraction parameters of the secondary machine are higher than the deaerator steam temperature of the deaerator, part of the exhaust steam of the back-pressure steam turbine enters the secondary machine, and the feed water enters from the feed water pipeline, and is heated step by step through the hybrid heater, deaerator, second heater and first heater in sequence, and then output from the feed water pipeline. The hybrid heater is provided with heat energy by the exhaust steam of the secondary machine; the second heater and the first heater are provided with heat energy by the steam of the back-pressure steam turbine, and the condensed water after the steam is condensed enters the deaerator as feed water.

[0059] The surface heater, hybrid heater, deaerator, single valve, sequence valve and other equipment involved in the present invention are technical contents well known to those skilled in the art and will not be described in detail in the present invention.

[0060] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Any modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for optimizing the utilization of back-pressure steam of a back-pressure steam turbine, characterized in that: A secondary machine is installed to provide steam from exhaust steam of a back-pressure steam turbine, and a secondary generator is provided corresponding to the secondary machine, and the electricity generated by the secondary machine is used for factory electricity; The secondary machine is used to preliminarily heat the feed water, and the preliminarily heated feed water enters the deaerator, and then the back pressure steam turbine is used to reheat the feed water passing through the deaerator; In the case where the extraction steam parameter of the secondary machine is not higher than the deaerator steam temperature of the deaerator, the extraction steam and exhaust steam of the secondary machine are used to heat the feed water that has not passed through the deaerator, the exhaust steam of the back-pressure steam turbine is used for low-pressure heating and heating the deaerator, and the extraction steam of the back-pressure steam turbine is used to heat the feed water after passing through the deaerator; When the extraction steam parameters of the secondary machine are higher than the deoxygenated steam temperature of the deaerator, the exhaust steam of the secondary machine is used to heat the feed water that has not passed through the deaerator, and the extraction steam of the secondary machine is used to heat the deaerator. The extraction steam and exhaust steam of the back-pressure steam turbine are used to heat the feed water that passes through the deaerator, and the exhaust steam of the back-pressure steam turbine is also used for low-pressure heating.

2. The method for optimizing back-pressure steam utilization of a back-pressure steam turbine according to claim 1, characterized in that: The inlet steam parameter of the secondary machine is the full load parameter or rated parameter of the exhaust steam of the back pressure steam turbine.

3. The method for optimizing back-pressure steam utilization of a back-pressure steam turbine according to claim 1, characterized in that: The steam condensed water after the back-pressure steam turbine heats the feed water enters the deaerator and serves as the feed water.

4. The method for optimizing back-pressure steam utilization of a back-pressure steam turbine according to claim 1, characterized in that: When the extraction steam parameters of the secondary machine are not higher than the deoxygenated steam temperature of the deaerator, the exhaust steam and extraction steam of the secondary machine heat the feed water that has not passed through the deaerator through the heater, and the condensate of the high-pressure heater connected to the secondary machine is discharged to the low-pressure heater.

5. The method for optimizing back-pressure steam utilization of a back-pressure steam turbine according to claim 1, characterized in that: The secondary machine is one of a steam turbine and a screw expander.

6. The method for optimizing back-pressure steam utilization of a back-pressure steam turbine according to claim 1, characterized in that: An artificial neural network is used to evaluate the economy under parameter operation, so as to confirm the type of the regulating valve of the back-pressure steam turbine; the types of the regulating valve include single valves and sequential valves; the artificial neural network includes one of a BP neural network and a Hopfield neural network; the parameters include inlet flow, electric power, steam inlet temperature, steam inlet pressure, back pressure, medium-pressure steam supply flow, low-pressure steam supply flow, and single valve or sequential valve.

7. An optimization utilization system using the back pressure steam optimization utilization method according to any one of claims 1 to 6, characterized in that: It includes a back-pressure steam turbine, a secondary machine provided with steam by exhaust steam from the back-pressure steam turbine, a first heater, a second heater and a deaerator; the back-pressure steam turbine is provided with a main generator correspondingly, and the secondary machine is provided with a secondary generator correspondingly; In the case where the extraction parameter of the secondary machine is not higher than the deoxygenated steam temperature of the deaerator, a third heater and a final-stage heater are also included; the exhaust port of the secondary machine is connected to the steam inlet of the final-stage heater, the extraction port of the secondary machine is connected to the steam inlet of the third heater, the secondary extraction port of the back-pressure steam turbine is connected to the steam inlet of the second heater, the primary extraction port of the back-pressure steam turbine is connected to the steam inlet of the first heater, the exhaust port of the back-pressure steam turbine is connected to the steam inlet of the deaerator, and the exhaust port of the back-pressure steam turbine is also connected to a low-pressure heating pipeline; the inlet of the final-stage heater is connected to a feed water pipeline, the outlet of the final-stage heater is connected to the inlet of the third heater, and the outlet of the third heater is connected to the water inlet of the deaerator; the water outlet of the deaerator is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the first heater, and the outlet of the first heater is connected to a feed water pipeline; When the extraction parameters of the secondary machine are higher than the deoxygenated steam temperature of the deaerator, a hybrid heater is also included, wherein the exhaust port of the secondary machine is connected to the steam inlet of the hybrid heater, the extraction port of the secondary machine is connected to the steam inlet of the deaerator, the exhaust port of the back-pressure steam turbine is connected to the steam inlet of the second heater, the secondary extraction port of the back-pressure steam turbine is connected to the steam inlet of the first heater, and the exhaust port of the back-pressure steam turbine is also connected to a low-pressure heating pipeline; the inlet of the hybrid heater is connected to a feed water pipeline, the outlet of the hybrid heater is connected to the water inlet of the deaerator, the water outlet of the deaerator is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the first heater, and the outlet of the first heater is connected to the feed water pipeline.

8. The optimization utilization system according to claim 7, characterized in that: The first heater, the second heater and the third heater are all surface heaters; the final heater is a surface heater and a hybrid heater; a drain pipe is provided between the third heater and the final heater; When the final stage heater is a surface heater, the drain pipe extends outward to be connected to one of the water inlet of the deaerator or the feed water pipeline; the drain pipe between the third heater and the final stage heater is provided with a first water control regulating valve, and the extended part of the drain pipe is provided with a second water control regulating valve and a condensate pump in sequence; When the final-stage heater is a hybrid heater, a first relay water pump is further provided between the outlet of the final-stage heater and the inlet of the third heater.

9. The optimization utilization system according to claim 8, characterized in that: The final stage heater is installed at the operating layer of the back pressure steam turbine; When the final stage heater is a surface heater, the condensate pump is installed at the 0-meter layer; When the final-stage heater is a hybrid heater, the first relay water pump is installed at the 0-meter layer.

10. The optimization utilization system according to claim 7, characterized in that: The steam condensate outlets of the first heater and the second heater are connected to the inlet of the deaerator.

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