Flexible and efficient resident heating combined heat and power generation system

Abstract

The invention relates to the technical field of energy utilization, in particular to a flexible and efficient resident heating combined heat and power generation system which comprises a unit unit and further comprises a first-stage heating unit, a second-stage heating unit, a third-stage heating unit and a fourth-stage heating unit. The second-stage heating unit comprises a second-stage heater, a second-stage water supply pipe, a second-stage heat supply pipe, a second-stage heat exchanger, a second-stage water drain pipe and a second-stage water outlet pipe; and the third-stage heating unit comprises a third-stage heater, a medium-pressure cylinder steam supply pipe, a low-pressure cylinder steam supply pipe, a third-stage water supply pipe and a heating water supply pipe. The medium-pressure cylinder exhaust steam and the low-pressure cylinder exhaust steam are used for heating the heating return water in a stepped mode, the heating return water is reheated and sent back for heat supply through the exhaust steam of the unit, and under the condition that the electrical load of a conventional high-back-pressure unit is determined, the fluctuation degree of the general thermal load does not exceed 5%; according to the scheme, under the condition that the electric load is determined, the heating load outside the unit can fluctuate within + / -50%, and the thermoelectric decoupling capacity is high.

Description

Technical Field

[0001] The invention relates to the technical field of energy utilization, and in particular to a flexible and efficient residential heating cogeneration system. Background Art

[0002] High back pressure heating means increasing the pressure of the exhaust steam in the condenser and using circulating water from the heat network to cool the exhaust steam, thereby using the latent heat of vaporization of the exhaust steam from the steam turbine unit to heat the circulating water and achieve heating. This technology has low heating energy consumption, but has the following disadvantages: (1) Strong coupling between heat and electricity and poor operational flexibility. When the heat supply is constant, the electrical load regulation capacity is less than 5%; (2) High requirements for the operational stability of the heat network. When the circulating water from the heat network leaks, it may lead to insufficient cooling water for the unit and an increase in the exhaust steam temperature, thereby threatening the safe operation of the unit.

[0003] Both the medium- and low-pressure interconnecting pipe heating and the low-pressure cylinder zero-output heating technology use the medium-pressure cylinder exhaust steam to heat the circulating water of the heat network. Under this method, the unit operation flexibility is greater, but the energy quality of the medium-pressure cylinder exhaust steam is relatively high. If it is directly used to heat the circulating water of the heat network, there will be a loss of work capacity and high heating energy consumption.

[0004] Since both have their own shortcomings, the units are unable to strike a balance between power generation flexibility and heating energy consumption, resulting in energy waste. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above-mentioned problem that the flexibility of the unit and the heating energy consumption cannot be well balanced, the present invention is proposed.

[0007] Therefore, the object of the present invention is to provide a flexible and efficient residential heating cogeneration system.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a flexible and efficient residential heating cogeneration system, including a unit unit, and also including a primary heating unit, including a heating return pipe, a first heating inlet, and a first heating outlet; a secondary heating unit, including a secondary heater, a second heating water supply pipe, a second heating heat supply pipe, a second heating heat exchanger, a second heating drainage pipe, and a second heating outlet pipe; a tertiary heating unit, including a tertiary heater, a medium-pressure cylinder steam supply pipe, a low-pressure cylinder steam supply pipe, a third heating drainage pipe, and a heating water supply pipe; The heating return water pipe is connected to the unit unit through a first addition inlet, and a first addition outlet is connected to a second-level water supply pipe. The unit unit is connected to a second-level heater through a second addition heating pipe. The second addition heat exchanger is used for heat exchange inside the second-level heater. The second addition drain pipe discharges condensed water, and the second addition water outlet pipe discharges the heated heating return water. The third-level heater is connected to the unit unit through a medium-pressure cylinder steam supply pipe and a low-pressure cylinder steam supply pipe. The third addition drain pipe discharges condensed water, and the heating water supply pipe discharges the heated heating return water.

[0009] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the unit includes a medium-pressure cylinder, a low-pressure cylinder, a connecting air pipe, and a generator, and the medium-pressure cylinder is connected to the low-pressure cylinder through a connecting steam pipe.

[0010] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the unit also includes a condenser, a condensate pump, a low-pressure heating module and a deaerator. The condenser is connected to the exhaust port of the low-pressure cylinder, the output end of the condenser is connected to the condensate pump, the output end of the condensate pump is connected to the low-pressure heating module, and the output end of the low-pressure heating module and the exhaust port of the medium-pressure cylinder are connected to the deaerator.

[0011] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the low-pressure heating module is provided with four low-pressure heaters, and each of the low-pressure heaters is connected to the low-pressure cylinder.

[0012] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the heating return water pipe is used to send the heating return water into the condenser, the condenser serves as a primary heater, and the heating return water heated by the condenser is sent to the secondary heater through an outlet.

[0013] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the secondary heater is provided with a first second heater and a second second heater, heat is exchanged between the first second heater and the second second heater via a second heater heat exchanger, and the first second heater and the second second heater are both provided with a cold side and a hot side.

[0014] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, wherein: the cold side input ends of the first two plus and the second two plus are both connected to the two plus water supply pipes, the cold side output ends of the first two plus and the second two plus are both connected to the two plus water outlet pipes, the hot side input end of the second two plus is connected to the output end of the low-voltage module, the hot side output end of the second two plus is connected to the input end of the first two plus, the hot side output end of the first two plus is connected to the input end of the two plus heat exchanger, and the output end of the two plus heat exchanger is connected to the input end of the low-voltage module.

[0015] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the three-stage heater is provided with two hot sides and one cold side, the input end of the cold side is connected to two water pipes, and the output end of the cold side supplies heating to the outside through a heating water supply pipe.

[0016] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, one hot side of the three-stage heater is connected to the exhaust steam of the medium-pressure cylinder, the other hot side of the three-stage heater is connected to the exhaust steam of the low-pressure cylinder, and both hot side output ends of the three-stage heater are connected to the output end of the condensate pump.

[0017] As a preferred solution of the flexible and efficient residential heating cogeneration system described in the present invention, the low-pressure cylinder supplies steam to the low-pressure heating module, the steam in the low-pressure heating module is transported back to the condenser outlet after heat exchange, the condensate pump transports condensate into the low-pressure heating module for heating, and after heating, part of the condensate is sent to the hot side of the secondary heater, and part is sent to the deaerator.

[0018] The beneficial effects of the present invention are as follows: the present invention utilizes the exhaust steam of the medium-pressure cylinder and the exhaust steam of the low-pressure cylinder to perform step-by-step heating of the heating return water, and utilizes the exhaust steam of the unit to reheat the heating return water and send it back for heating. For conventional high back-pressure units, when the electric load is determined, the general fluctuation degree of the heat load does not exceed 5%; under the scheme of the present invention, when the electric load is determined, the external heating load of the unit can fluctuate between ±50%, and it has a higher thermoelectric decoupling capability, and can more flexibly adjust the external heating load of the unit when the electric load is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 The overall schematic diagram of a flexible and efficient residential heating cogeneration system.

[0021] Figure 2 Schematic diagram of a secondary heating unit for a flexible and efficient residential heating combined heat and power system. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Example 1

[0027] Reference Figure 1 , which is the first embodiment of the present invention, and provides a flexible and efficient residential heating cogeneration system, including a unit unit 100, and also including a primary heating unit 200, including a heating return pipe 201, a first heating inlet 202, and a first heating outlet 203; a secondary heating unit 300, including a secondary heater 301, a second heating water supply pipe 302, a second heating heat supply pipe 303, a second heating heat exchanger 304, a second heating drainage pipe 305, and a second heating outlet pipe 306; a tertiary heating unit 400, including a tertiary heater 401, a steam supply pipe of a medium pressure cylinder 101, a steam supply pipe of a low pressure cylinder 102, a third heating drainage pipe 404, and a heating water supply pipe 405;

[0028] Among them, the heating return water pipe 201 is connected to the unit unit 100 through an addition inlet 202, and an addition outlet 203 is connected to the secondary water supply pipe. The unit unit 100 is connected to the secondary heater 301 through a second addition heating pipe 303. The second addition heat exchanger 304 is used for heat exchange inside the secondary heater 301. The second addition drain pipe 305 discharges condensed water, and the second addition water outlet pipe 306 discharges the heated heating return water. The third-stage heater 401 is connected to the unit unit 100 through the steam supply pipe of the medium-pressure cylinder 101 and the steam supply pipe of the low-pressure cylinder 102. The third addition drain pipe 404 discharges condensed water, and the heating water supply pipe 405 discharges the heated heating return water.

[0029] Specifically, the heating return water enters the first-stage heating unit 200 and is preliminarily heated by the exhaust steam of the low-pressure cylinder 102. The exhaust steam of the low-pressure cylinder 102 exchanges heat with the heating return water and enters the condenser 105 to condense and produce condensed water. The heating return water after the first-stage heating enters the second-stage heating unit 300 and is heated in the second-stage heating unit 300 by the heat of the low-pressure heater. The heating return water after the second-stage heating enters the third-stage heating unit 400. The third-stage heating unit 400 uses the exhaust steam of the medium-pressure cylinder 101 as the driving heat source of the third-stage heater 401 and the exhaust steam of the low-pressure cylinder 102 as the low-temperature heat source. The condensate drain after heat recovery is recovered to the condensate pump 106. The temperature of the heating water can reach 100-110°C after being heated in the third-stage heater 401, which can meet the external heating load requirements.

[0030] Furthermore, the unit 100 includes a medium-pressure cylinder 101, a low-pressure cylinder 102, a connecting air pipe, and a generator 104. The medium-pressure cylinder 101 and the low-pressure cylinder 102 are connected via a connecting steam pipe 103. The unit 100 also includes a condenser 105, a condensate pump 106, a low-pressure heating module 107, and a deaerator 108. The condenser 105 is connected to the exhaust port of the low-pressure cylinder 102, the output end of the condenser 105 is connected to the condensate pump 106, the output end of the condensate pump 106 is connected to the low-pressure heating module 107, and the output end of the low-pressure heating module 107 and the exhaust port of the medium-pressure cylinder 101 are connected to the deaerator 108.

[0031] Furthermore, the low-pressure module 107 is provided with four low-pressure heaters, each of which is connected to the low-pressure cylinder 102. The four low-pressure heaters are connected in sequence from back to front, so that the exhaust steam of the low-pressure cylinder 102 passes through each low-pressure heater in sequence to heat the condensed water to a certain extent. The heated condensed water is divided into two paths, one of which is sent to the deaerator 108 and then discharged after merging with the exhaust steam of the medium-pressure cylinder 101, and the other enters the secondary heating unit 300 to perform secondary heating on the heating return water.

[0032] Furthermore, the heating return water pipe 201 is used to send the heating return water into the condenser 105, and the condenser 105 serves as a primary heater. The heating return water heated by the condenser 105 is sent to the secondary heater 301 through an outlet 203. The heating return water is heated at the primary stage in the condenser 105, and then enters the secondary heater 301 for secondary heating.

[0033] Furthermore, the low-pressure cylinder 102 supplies steam to the low-pressure heating module 107, and the steam in the low-pressure heating module 107 is transported back to the outlet of the condenser 105 after heat exchange. The condensate pump 106 transports condensate into the low-pressure heating module 107 for heating. After heating, part of the condensate is sent to the hot side of the secondary heater 301, and part is sent to the deaerator 108.

[0034] Example 2

[0035] Reference Figure 1-Figure 2 , which is the second embodiment of the present invention, and this embodiment provides: the secondary heater 301 is provided with a first second heater 301a and a second second heater 301b, heat is exchanged between the first second heater 301a and the second second heater 301b through a second heater heat exchanger 304, and the first second heater 301a and the second second heater 301b are both provided with a cold side and a hot side.

[0036] Specifically, the cold side input ends of the first and second heat exchangers 301a and 301b are both connected to the heat exchanger water supply pipe 302, the cold side output ends of the first and second heat exchangers 301a and 301b are both connected to the heat exchanger water outlet pipe 306, the hot side input end of the second heat exchanger 301b is connected to the output end of the low-temperature heat exchanger module 107, the hot side output end of the second heat exchanger 301b is connected to the input end of the first heat exchanger 301a, the hot side output end of the first heat exchanger 301a is connected to the input end of the low-temperature heat exchanger module 107.

[0037] When the heating return water enters the secondary heater 301, it is divided into two paths, entering the first two-addition 301a and the second two-addition 301b respectively. The condensate before the inlet of the deaerator 108 output by the low-pressure module 107 enters the second two-addition 301b, and enters the first two-addition 301a after heat exchange with the heating return water, and enters the second heat exchanger 304 after heat exchange with the heating return water again, and finally is discharged before the inlet of the low-pressure module 107 after heat exchange with the heating return water in turn.

[0038] Furthermore, the secondary heater 301 adopts the first type of absorption heat pump as the second stage heater 301, which can achieve that the outlet water temperature of the heat pump driven hot water is lower than the inlet water temperature of the hot network water that needs to be heated. In the secondary heater 301, the condensed water before the inlet of the deaerator 108 of the unit heat recovery system is used as high-temperature driving hot water (about 150°C). After the heat exchange in the secondary heater 301, the water temperature of the driving hot water drops to about 65°C, and then it is returned to the unit heat recovery system through an electric pump. By recovering the high-temperature condensate from the heat recovery system, the amount of steam extracted from the low-pressure cylinder 102 to the low-pressure heaters at all levels of the heat recovery system can be increased, which indirectly realizes the application of energy of low-grade steam extraction at all levels (the energy consumption of heating with extraction steam from the low-pressure cylinder 102 is lower than that of heating with exhaust steam from the medium-pressure cylinder 101, where the energy consumption index is exhaust steam from the medium-pressure cylinder 101 > extraction steam from low-pressure heater No. 4 > extraction steam from low-pressure heater No. 3 > extraction steam from low-pressure heater No. 2 > extraction steam from low-pressure heater No. 1), achieving orderly and efficient use of energy. The temperature of the hot network water in the secondary heater 301 can be increased by 5 to 10°C, that is, the outlet water temperature reaches 85 to 90°C, and the outlet water temperature depends on the ratio of the water extraction from the heat recovery system to the water volume of the hot network.

[0039] Example 3

[0040] Reference Figure 1-Figure 2 , which is the third embodiment of the present invention, and this embodiment provides: the three-stage heater 401 is provided with two hot sides and one cold side, the input end of the cold side is connected to the second water supply pipe 306, and the output end of the cold side provides heating to the outside through the heating water supply pipe 405.

[0041] Specifically, one hot side of the three-stage heater 401 is connected to the exhaust steam of the medium-pressure cylinder 101, and the other hot side of the three-stage heater 401 is connected to the exhaust steam of the low-pressure cylinder 102. Both hot side output ends of the three-stage heater 401 are connected to the output end of the condensate pump 106.

[0042] The exhaust steam from the intermediate pressure cylinder 101 and the exhaust steam from the low pressure cylinder 102 are input into the three-stage heater 401 at the same time, and then discharged to the front end of the inlet of the condensate pump 106 after heat exchange, and the heated heating return water is used to supply heat to the outside.

[0043] Furthermore, a second-type absorption heat pump is used as the third-stage heater 401, the exhaust steam from the medium-pressure cylinder 101 of the unit is used as the driving heat source of the third-stage heater 401, and the exhaust steam from the low-pressure cylinder 102 is used as the low-temperature heat source. The condensate drain after heat recovery is recovered to the pipeline before the condensate pump 106. The temperature of the heating water can reach 100-110°C after being heated in the third-stage heater 401, which can meet the external heating load requirements.

[0044] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0045] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0046] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flexible and efficient residential heating cogeneration system, comprising a unit (100), characterized in that: Also includes, The primary heating unit (200) comprises a heating water return pipe (201), a heating inlet (202), and a heating outlet (203); The secondary heating unit (300) comprises a secondary heater (301), a secondary water supply pipe (302), a secondary heating pipe (303), a secondary heat exchanger (304), a secondary drainage pipe (305), and a secondary water outlet pipe (306); The three-stage heating unit (400) comprises a three-stage heater (401), a steam supply pipe of a medium-pressure cylinder (101), a steam supply pipe of a low-pressure cylinder (102), a three-stage heating and water discharge pipe (404) and a heating water supply pipe (405); The heating return water pipe (201) is connected to the unit (100) through a first addition inlet (202), and a first addition outlet (203) is connected to a second-stage water supply pipe. The unit (100) is connected to a second-stage heater (301) through a second addition heating pipe (303). The second addition heat exchanger (304) is used for heat exchange inside the second-stage heater (301). The second addition drainage pipe (305) discharges condensed water, and the second addition water outlet pipe (306) discharges heated heating return water. The third-stage heater (401) is connected to the unit (100) through a steam supply pipe of a medium-pressure cylinder (101) and a steam supply pipe of a low-pressure cylinder (102). The third addition drainage pipe (404) discharges condensed water, and the heating water supply pipe (405) discharges heated heating return water.

2. The flexible and efficient residential heating cogeneration system according to claim 1, characterized in that: The unit (100) comprises a medium-pressure cylinder (101), a low-pressure cylinder (102), a connecting air pipe, and a generator (104); the medium-pressure cylinder (101) and the low-pressure cylinder (102) are connected via a connecting steam pipe (103).

3. The flexible and efficient residential heating cogeneration system according to claim 2, characterized in that: The unit (100) further comprises a condenser (105), a condensate pump (106), a low-pressure heating module (107) and a deaerator (108); the condenser (105) is connected to the exhaust port of the low-pressure cylinder (102); the output end of the condenser (105) is connected to the condensate pump (106); the output end of the condensate pump (106) is connected to the low-pressure heating module (107); the output end of the low-pressure heating module (107) and the exhaust port of the medium-pressure cylinder (101) are connected to the deaerator (108).

4. The flexible and efficient residential heating cogeneration system according to claim 3, characterized in that: The low-pressure heating module (107) is provided with four low-pressure heaters, and each of the low-pressure heaters is connected to the low-pressure cylinder (102).

5. The flexible and efficient residential heating cogeneration system according to claim 4, characterized in that: The heating return water pipe (201) is used to send the heating return water into the condenser (105). The condenser (105) serves as a primary heater. The heating return water heated by the condenser (105) is sent to the secondary heater (301) through an outlet (203).

6. The flexible and efficient residential heating cogeneration system according to claim 5, characterized in that: The secondary heater (301) is provided with a first second heater (301a) and a second second heater (301b), and heat is exchanged between the first second heater (301a) and the second second heater (301b) via a second heater heat exchanger (304), and both the first second heater (301a) and the second second heater (301b) are provided with a cold side and a hot side.

7. The flexible and efficient residential heating cogeneration system according to claim 6, characterized in that: The cold side input ends of the first two heat exchangers (301a) and the second two heat exchangers (301b) are both connected to the two heat exchanger water supply pipe (302); the cold side output ends of the first two heat exchangers (301a) and the second two heat exchangers (301b) are both connected to the two heat exchanger water outlet pipe (306); the hot side input end of the second two heat exchangers (301b) is connected to the output end of the low-temperature heat exchanger module (107); the hot side output end of the second two heat exchangers (301b) is connected to the input end of the first two heat exchangers (301a); the hot side output end of the first two heat exchangers (301a) is connected to the input end of the two heat exchangers (304); and the output end of the two heat exchangers (304) is connected to the input end of the low-temperature heat exchanger module (107).

8. The flexible and efficient residential heating cogeneration system according to claim 7, characterized in that: The three-stage heater (401) is provided with two hot sides and one cold side, the input end of the cold side is connected to two water supply pipes (306), and the output end of the cold side provides heating to the outside through a heating water supply pipe (405).

9. The flexible and efficient residential heating cogeneration system according to claim 8, characterized in that: One hot side of the three-stage heater (401) is connected to the exhaust steam of the medium-pressure cylinder (101), and the other hot side of the three-stage heater (401) is connected to the exhaust steam of the low-pressure cylinder (102). Both hot side output ends of the three-stage heater (401) are connected to the output end of the condensate pump (106).

10. The flexible and efficient residential heating cogeneration system according to claim 9, characterized in that: The low-pressure cylinder (102) supplies steam to the low-pressure heating module (107). The steam of the low-pressure heating module (107) is transported back to the outlet of the condenser (105) after heat exchange. The condensate pump (106) transports condensate into the low-pressure heating module (107) for heating. After the condensate is heated, part of it is sent to the hot side of the secondary heater (301), and part of it is sent to the deaerator (108).

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