Combined heat and power generation system and method integrating decarburization and flue gas latent heat recovery

Abstract

The invention relates to the technical field of combined heat and power generation, and particularly discloses a combined heat and power generation system and method integrating decarburization and flue gas latent heat recovery, boiler flue gas enters first decarburization equipment, absorbs water vapor and carbon dioxide and releases heat, and heat supply network return water enters the first decarburization equipment for heat exchange. One part of steam exhausted by the steam turbine is used for second decarburization equipment, carbon dioxide and water vapor are released after heat is absorbed, heat is recovered through a waste heat recovery device, water vapor is condensed, and carbon dioxide is purified, compressed and stored; and the other part of exhaust steam heats heat supply network water supply through the heat exchanger. One or more steam turbines can be arranged, and a temperature adjusting device can be arranged between the steam turbines and the heat exchanger. Various operation methods are provided, a proper operation mode can be selected according to different working conditions and requirements, efficient decarburization and smoke latent heat recovery are achieved, the energy utilization efficiency is improved, and the adaptability and flexibility of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cogeneration, and in particular to a cogeneration system and method integrating decarbonization and flue gas latent heat recovery. Background Art

[0002] In today's energy landscape, cogeneration (CHP) is a highly efficient energy utilization method widely used in various industrial production and residential heating scenarios. Traditional CHP systems primarily consist of core equipment such as boilers and steam turbines. The boiler burns fuel to generate high-temperature, high-pressure steam, which drives the turbine to generate electricity. Simultaneously, the exhaust steam from the turbine is used to provide heat, achieving cascaded energy utilization and improving overall energy efficiency to a certain extent.

[0003] However, there are many problems that need to be solved in the actual operation of traditional cogeneration systems.

[0004] In terms of flue gas treatment, flue gas produced by boiler combustion contains large amounts of water vapor and carbon dioxide. Traditional systems often directly discharge this flue gas into the atmosphere, which not only results in a significant waste of latent heat in the flue gas, but also, as the main greenhouse gas, the large-scale emission of carbon dioxide in the flue gas has a serious negative impact on global climate change, exacerbating the greenhouse effect and triggering a series of environmental problems such as rising global temperatures, rising sea levels, and frequent extreme weather events.

[0005] While traditional systems utilize steam turbine exhaust for heating, this utilization method is limited and fails to fully tap the potential energy value of the steam turbine exhaust. However, the steam turbine exhaust still contains a certain amount of heat, and further optimizing its utilization method will help improve the energy efficiency of the entire system.

[0006] To address these issues, the industry has made numerous attempts. Some research focuses on flue gas decarbonization technologies, removing carbon dioxide from flue gas through methods such as chemical absorption and physical adsorption. However, these technologies often require additional energy input, resulting in high equipment investment and operating costs, and insufficient consideration of flue gas latent heat recovery. Other research focuses on improving the utilization efficiency of turbine exhaust steam, but lacks effective integration with flue gas decarbonization and latent heat recovery, making it difficult to optimize overall system performance.

[0007] Therefore, a cogeneration system and method integrating decarbonization and flue gas latent heat recovery has become an urgent problem to be solved. Summary of the Invention

[0008] The technical problem addressed by the present invention is to provide a combined heat and power (CHP) system and method that integrates decarbonization and flue gas latent heat recovery. This system effectively decarbonizes flue gas and recovers its latent heat while simultaneously achieving CHP, thereby improving energy efficiency and reducing environmental pollution. The present invention also provides multiple operating methods for the system to accommodate varying operating conditions and requirements.

[0009] To solve the above technical problems, the present invention provides a technical solution: a cogeneration system integrating decarbonization and flue gas latent heat recovery, mainly including a boiler, a steam turbine, a first decarbonization device, a second decarbonization device, a heat exchanger and a waste heat recovery device.

[0010] The boiler is connected to the primary decarburization equipment, where the flue gas generated by the boiler enters the primary decarburization equipment. The primary decarburization equipment absorbs water vapor and carbon dioxide from the flue gas, releasing heat in the process. Return water from the heating network is connected to the primary decarburization equipment, exchanging heat with the materials within it. This absorbs the heat released during the dehydration and decarburization process, achieving initial recovery of the flue gas's latent heat.

[0011] The steam turbine is connected to the second decarburization unit and a heat exchanger. The turbine's exhaust steam is split into two parts: one portion serves as decarburization material in the second decarburization unit, which absorbs the heat and releases carbon dioxide and water vapor. The other portion of the exhaust steam passes through the heat exchanger to heat the water supply to the heating network, raising its temperature.

[0012] The carbon dioxide and water vapor released by the second decarbonization equipment enter the waste heat recovery device. The waste heat recovery device uses the return water from the heat network to recover the heat therein, condense the water vapor, and purify, compress and store the carbon dioxide at the same time, thereby achieving carbon dioxide emission reduction and resource utilization.

[0013] There may be one or more steam turbines. When there are more than one steam turbine, the steam turbines may be connected in series, in parallel, or in a combination of series and parallel to meet different power generation and heat supply requirements.

[0014] A temperature control device, preferably a heat pump, is installed between the steam turbine and the heat exchanger. This device regulates the temperature of the turbine exhaust steam entering the heat exchanger, ensuring that the water supplied to the heating network is heated to the appropriate temperature, thereby improving system stability and efficiency.

[0015] The present invention also provides an operating method for a decarbonized cogeneration system, which is as follows:

[0016] The flue gas generated in the boiler enters the first decarbonization equipment, and the water vapor and carbon dioxide in the flue gas are absorbed by the first decarbonization equipment, and heat is released in the absorption process.

[0017] The return water from the heat network enters the first decarbonization equipment, exchanges heat with the materials therein, absorbs the heat released by the first decarbonization equipment, and realizes the recovery of the latent heat of the flue gas.

[0018] The flue gas coming out of the first decarbonization equipment enters other devices for further treatment or discharge.

[0019] The turbine exhaust steam continues to heat the heat supply water, heating it to the supply temperature before being supplied to the heat supply network. This operating method focuses primarily on flue gas decarbonization and latent heat recovery, and the utilization of the turbine exhaust steam is relatively simple.

[0020] The present invention also provides an operating method for a cogeneration system with simultaneous decarbonization and regeneration, which is as follows:

[0021] The flue gas generated in the boiler enters the first decarbonization equipment, where the water vapor and carbon dioxide in the flue gas are absorbed by the first decarbonization equipment and release heat. The return water from the heat network enters the first decarbonization equipment for heat exchange and heat recovery, and the flue gas coming out of the first decarbonization equipment enters other devices.

[0022] Part of the exhaust steam from the steam turbine is used as the decarburizing material in the second decarburizing device, which releases carbon dioxide and water vapor after absorbing heat.

[0023] Carbon dioxide and water vapor enter the waste heat recovery device, which uses the return water from the heat network to recover the heat, condense the water vapor, and then purify and compress the carbon dioxide for storage.

[0024] Another portion of the turbine exhaust steam passes through a heat exchanger to heat the heat supply water network, heating it to the supply temperature before being supplied to the network. This operating method achieves flue gas decarbonization, latent heat recovery, and full utilization of turbine exhaust steam, while also treating carbon dioxide.

[0025] The present invention also provides an operating method of a regenerative cogeneration system, which is as follows:

[0026] Part of the exhaust steam from the steam turbine is used as the decarburizing material in the second decarburizing device, which releases carbon dioxide and water vapor after absorbing heat.

[0027] Carbon dioxide and water vapor enter the waste heat recovery device, which uses the return water from the heat network to recover the heat, condense the water vapor, and then purify and compress the carbon dioxide for storage.

[0028] Another portion of the turbine exhaust steam passes through a heat exchanger to heat the heat network feed water, heating it to the supply temperature before being supplied to the heat network. This operating method primarily focuses on utilizing turbine exhaust steam for decarbonization and heating the heat network feed water.

[0029] The present invention also provides an operating method of a cogeneration system, which is as follows:

[0030] The flue gas from the boiler enters the external facilities directly without undergoing the decarbonization and latent heat recovery treatment of this system.

[0031] The exhaust steam from the steam turbine heats the water supply to the heating network, and then supplies it to the supply temperature. This simplified operation method is suitable for certain special operating conditions or equipment maintenance situations.

[0032] The advantages of the present invention compared with the prior art are:

[0033] The present invention effectively recovers latent heat in flue gas and heat in exhaust steam of steam turbine through the first decarbonization equipment and the waste heat recovery device, thereby improving the comprehensive utilization efficiency of energy and reducing energy consumption.

[0034] The present invention achieves flue gas decarbonization, reduces emissions of greenhouse gases such as carbon dioxide, and has positive significance for alleviating global climate change. At the same time, the purification, compression and storage of carbon dioxide make it possible to utilize it as a resource.

[0035] The present invention provides a variety of operating methods, and a suitable operating mode can be selected according to different working conditions and requirements, thereby improving the adaptability and flexibility of the system.

[0036] The steam turbine of the present invention can be connected in series, in parallel or in a mixed series-parallel connection mode, and can better meet the needs of cogeneration projects of different scales and requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a heat and power cogeneration system integrating decarbonization and flue gas latent heat recovery according to the present invention.

[0038] Figure 2 It is a structural diagram of the connection between several steam turbines and the second decarbonization equipment.

[0039] Figure 3 It is a structural diagram of the connection between several steam turbines and heat exchangers.

[0040] Figure 4 This is a schematic diagram of the connection structure after adding a temperature control device between several steam turbines and heat exchangers

[0041] Figure 5 This is a working flow diagram of a cogeneration system integrating decarbonization and flue gas latent heat recovery in state 1 of the present invention.

[0042] Figure 6 This is a working flow diagram of a combined heat and power system in state 2 that integrates decarbonization and flue gas latent heat recovery according to the present invention.

[0043] Figure 7This is a working flow diagram of a cogeneration system integrating decarbonization and flue gas latent heat recovery under state 3 of the present invention.

[0044] Figure 8 This is a working flow diagram of a combined heat and power system in state 4 that integrates decarbonization and flue gas latent heat recovery according to the present invention.

[0045] Figure 9 This is a flowchart of the present invention when the power generation demand is low.

[0046] Figure 10 This is a workflow diagram of the present invention after the power generation demand increases.

[0047] Figure 11 It is a work flow chart of the present invention when the power generation demand is further increased.

[0048] As shown in the figure: 1. Boiler, 2. Steam turbine, 3. First decarburization equipment, 4. Second decarburization equipment, 5. Heat exchanger, 6. Waste heat recovery device, 7. Temperature control device. DETAILED DESCRIPTION

[0049] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "vertical", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, references to "first feature" and "second feature" may include one or more of these features. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of these features.

[0051] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] The following is a further detailed description of a cogeneration system and method for integrated decarbonization and flue gas latent heat recovery according to the present invention with reference to the accompanying drawings.

[0053] Combined with attachment Figure 1-11 , the present invention is introduced in detail.

[0054] 1. Combined heat and power system integrating decarbonization and flue gas latent heat recovery

[0055] Combined with attachment Figure 1 The boiler 1 is connected to the first decarbonization equipment 3, the turbine 2 is connected to the second decarbonization equipment 4 and the heat exchanger 5, the waste heat recovery device 6 is connected to the first decarbonization equipment 3 and the second decarbonization equipment 4, and the heat exchanger 5 is connected to the waste heat recovery device 6.

[0056] The flue gas generated in the boiler 1 enters the first decarbonization equipment 3 (the decarbonization equipment in use), the water vapor and carbon dioxide in the flue gas are absorbed by the first decarbonization equipment 3, and heat is released in the first decarbonization equipment 3. The return water from the heat network enters the first decarbonization equipment 3 to exchange heat with the materials therein, and the heat released during the dehydration and decarbonization process is absorbed. The flue gas from the first decarbonization equipment 3 goes to other devices.

[0057] A portion of the exhaust steam from steam turbine 2 is used to decarbonize materials in the second decarbonization unit 4 (the decarbonization unit undergoing regeneration). This unit absorbs heat, releasing carbon dioxide and water vapor, which contain a large amount of heat. The carbon dioxide and water vapor pass through waste heat recovery unit 6, where heat is recovered using return water from the heat network. The majority of the water vapor is condensed, and the carbon dioxide is purified, compressed, and stored.

[0058] Another part of the exhaust steam from the steam turbine 2 continues to heat the water supply to the heating network through the heat exchanger 5, is heated to the water supply temperature, and is supplied to the heating network.

[0059] Combined with attachment Figure 2 In this system, the steam turbine 2 can be a plurality of steam turbines 2 operating in combination.

[0060] Combined with attachment Figure 3-4 During regeneration, the extraction steam or exhaust steam of one or more steam turbines 2 can be used for regeneration. The steam turbines 2 can be connected in series, parallel or in a mixed manner to supply steam to the regenerated material.

[0061] The extraction steam or exhaust steam from one or more steam turbines 2 can be used to heat the water supply to the heating network. The steam turbines 2 can be connected in series, parallel, or in a mixed configuration to supply water and steam to the heating network. The extraction steam and exhaust steam can be directly exchanged with the water supply to the heating network, or can be passed through a temperature control device 7 such as a heat pump before being exchanged with the water supply to the heating network.

[0062] 2. Different operation times of flue gas decarbonization and decarbonization material regeneration result in different operation states:

[0063] State 1: The system operates in decarburization mode but not in regeneration mode. In this state, the steam volume of turbine 2 is the least.

[0064] Operation method of decarbonized cogeneration system: Figure 5 The flue gas generated by boiler 1 enters the first decarbonization unit 3, where the water vapor and carbon dioxide in the flue gas are absorbed, releasing heat. Return water from the heating network enters the first decarbonization unit 3 for heat exchange with the materials therein, absorbing the heat released during the dehydration and decarbonization process. The flue gas from the first decarbonization unit 3 is then directed to other devices. The exhaust steam from turbine 2 continues to heat the heating network feed water, heating it to the supply temperature before being supplied to the heating network.

[0065] State 2: The system is running decarburization and regeneration at the same time. In this state, the steam volume of turbine 2 is relatively large.

[0066] Operation method of decarbonization and regeneration synchronous cogeneration system: Figure 6 The flue gas generated in the boiler 1 enters the first decarbonization equipment 3, the water vapor and carbon dioxide in the flue gas are absorbed by the first decarbonization equipment 3, and heat is released in the first decarbonization equipment 3. The return water from the heat network enters the first decarbonization equipment 3 to exchange heat with the materials therein, and the heat released during the dehydration and decarbonization process is absorbed. The flue gas coming out of the first decarbonization equipment 3 goes to other devices.

[0067] A portion of the exhaust steam from steam turbine 2 is used to decarbonize materials in the second decarbonization unit 4. This unit absorbs heat, releasing carbon dioxide and water vapor, which contain a large amount of heat. The carbon dioxide and water vapor are then passed through waste heat recovery unit 6, where heat is recovered using return water from the heat network. The majority of the water vapor is condensed, and the carbon dioxide is purified, compressed, and stored.

[0068] The other part of the exhaust steam from the steam turbine 2 continues to heat the hot water network through the heat exchanger 5, and is heated to the supply water temperature and supplied to the hot water network.

[0069] The speed at which steam turbine 2 exhausts regenerated materials is related to the amount of regenerated steam. The regeneration speed can be flexibly adjusted, so the amount of steam used for regeneration can also be flexibly adjusted, thereby improving the flexibility of system power regulation.

[0070] State 3: The system does not run decarburization, but only regeneration. In this state, the steam volume of turbine 2 is the largest.

[0071] Operation method of regenerative cogeneration system: Figure 7 A portion of the exhaust steam from steam turbine 2 is used to decarbonize materials in the second decarbonization unit 4. This unit absorbs heat, releasing carbon dioxide and water vapor, which contain a large amount of heat. The carbon dioxide and water vapor are passed through waste heat recovery unit 6, where heat is recovered using return water from the heat network. The majority of the water vapor is condensed, and the carbon dioxide is purified, compressed, and stored.

[0072] The other part of the exhaust steam from the steam turbine 2 continues to heat the hot water network through the heat exchanger 5, and is heated to the supply water temperature and supplied to the hot water network.

[0073] Since decarburization is not performed, the reaction heat generated during the decarburization process is lacking to heat the return water of the heating network, so the steam turbine 2 needs more steam to heat the heating network water. This further increases the steam output of the steam turbine 2 and increases the power generation.

[0074] State 4: The system does not run decarburization or regeneration. In this state, the steam volume of turbine 2 is small.

[0075] Operation method of cogeneration system: Figure 8 At this point, the combined heat and power system with integrated decarbonization and flue gas latent heat recovery degenerates into a traditional cogeneration system. The flue gas from Boiler 1 is not decarbonized and is directly sent to the next facility. The exhaust gas from Turbine 2 heats the water supply network, heating it to the supply temperature and then supplying it to the heating network.

[0076] Each of the four operating states provides the same amount of heat, but the steam volume of turbine 2 varies, resulting in different power generation. The order of power generation, from highest to lowest, is: State 3 > State 2 > State 4 > State 1. Depending on power regulation needs, switching between these states allows for adjusting power generation while ensuring heat supply.

[0077] The specific implementation process of the cogeneration system and method of the present invention, which integrates decarbonization and flue gas latent heat recovery, is as follows:

[0078] Two back-pressure steam turbines 2 generate heat and power together. The exhaust condensing temperature of turbine I is 130℃, and the exhaust condensing temperature of turbine II is 90℃. The material for adsorbing carbon dioxide and water vapor is solid amine.

[0079] Combined with attachment Figure 9 When the power generation demand is low, the system does not extract steam to regenerate solid amine. The flue gas absorbs carbon dioxide and water vapor through the solid amine, and the adsorption temperature is controlled at around 90°C. Therefore, the first decarbonization equipment 3 can release a large amount of heat at 90°C. The return water from the heat network is passed into the first decarbonization equipment 3 to absorb the reaction heat, thereby reducing the exhaust volume of turbine II and reducing the power generation of turbine II.

[0080] Combined with attachment Figure 10When the demand for power generation increases, the second decarbonization equipment 4 can be started. The second decarbonization equipment 4 requires heat of about 120°C, which requires steam turbine 1 to provide heat. Therefore, steam turbine 1 increases the extraction volume to meet the heat supply. The excess steam enters the second decarbonization equipment 4, and releases the carbon dioxide and water vapor in the solid amine that has absorbed carbon dioxide and water vapor. This process requires a large amount of heat. Therefore, when the regeneration system is started, the exhaust volume of steam turbine 1 increases significantly, and the power generation of steam turbine 2 also increases significantly. The regeneration speed is not fixed. Different regeneration speeds require different steam volumes. Therefore, by adjusting the regeneration speed, the exhaust volume of steam turbine 1 can be adjusted, thereby adjusting the power generation of the system.

[0081] Combined with attachment Figure 11 If even the highest regeneration speed of Steam Turbine 2 fails to meet power generation requirements, power generation can be further increased by omitting flue gas decarbonization. Without flue gas decarbonization, the decarbonization device no longer releases heat. To ensure heat supply, the exhaust flow of Steam Turbine II needs to be increased to compensate for the insufficient heat, thereby further increasing power generation from Steam Turbine II.

[0082] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A combined heat and power system integrating decarbonization and flue gas latent heat recovery, characterized by: It includes boiler, steam turbine, first decarburization equipment, second decarburization equipment, heat exchanger and waste heat recovery device; The boiler is connected to a first decarbonization device, which absorbs water vapor and carbon dioxide in the flue gas generated in the boiler and releases heat; the first decarbonization device is connected to the heat network return water and exchanges heat with the material therein, absorbing the heat released during the dehydration and decarbonization process; The steam turbine is connected to the second decarburization equipment and the heat exchanger, part of the exhaust steam of the steam turbine is used as the decarburization material in the second decarburization equipment, and the other part is used to heat the water supply of the heating network through the heat exchanger; The second decarbonization equipment absorbs the exhaust steam of the turbine and releases carbon dioxide and water vapor. The second decarbonization equipment is connected to the waste heat recovery device, and the waste heat recovery device is connected to the first decarbonization equipment. The carbon dioxide and water vapor enter the waste heat recovery device and use the heat network return water to recover their heat, condense the water vapor, and purify the carbon dioxide for compression and storage.

2. The cogeneration system integrating decarbonization and flue gas latent heat recovery according to claim 1, characterized in that: There is one or more steam turbines. When there are more than one steam turbines, the steam turbines are connected in series / parallel or in a mixed series-parallel connection.

3. The cogeneration system integrating decarbonization and flue gas latent heat recovery according to claim 2, characterized in that: A temperature regulating device is also provided between the steam turbine and the heat exchanger.

4. The cogeneration system integrating decarbonization and flue gas latent heat recovery according to claim 3, characterized in that: The temperature regulating device is a heat pump.

5. A method for operating a decarbonization cogeneration system, used in the cogeneration system integrating decarbonization and flue gas latent heat recovery according to any one of claims 1 to 4, characterized in that: The following steps are involved: The flue gas generated in the boiler enters the first decarbonization equipment, and the water vapor and carbon dioxide in the flue gas are absorbed by the first decarbonization equipment, releasing heat in the first decarbonization equipment; the return water from the heating network enters the first decarbonization equipment to exchange heat with the materials therein, absorbing the heat released by the first decarbonization equipment; the flue gas coming out of the first decarbonization equipment enters other devices; the exhaust steam of the turbine continues to heat the heating network supply water, heats it to the water supply temperature, and supplies the water to the heating network.

6. A method for operating a combined heat and power system with simultaneous decarbonization and regeneration, for use in the combined heat and power system with integrated decarbonization and flue gas latent heat recovery according to any one of claims 1 to 4, characterized in that: The following steps are involved: The flue gas generated in the boiler enters the first decarburization equipment, where the water vapor and carbon dioxide in the flue gas are absorbed and release heat. The return water from the heat network enters the first decarburization equipment to exchange heat with the materials therein, absorbing the heat released by the first decarburization equipment. The flue gas from the first decarburization equipment enters other devices. A portion of the exhaust steam from the steam turbine is used to decarbonize the materials in the second decarbonization device. The second decarbonization device absorbs heat and releases carbon dioxide and water vapor. The carbon dioxide and water vapor enter the waste heat recovery device, which uses the return water from the heat network to recover the heat, condense the water vapor, and then purify the carbon dioxide and compress it for storage. The other part of the exhaust steam from the steam turbine continues to heat the water supply to the heating network through the heat exchanger, and is heated to the water supply temperature and supplied to the heating network.

7. A method for operating a regenerative cogeneration system, used in the cogeneration system with integrated decarbonization and flue gas latent heat recovery according to any one of claims 1 to 4, characterized in that: The following steps are involved: A portion of the exhaust steam from the steam turbine is used to decarbonize the materials in the second decarbonization device. The second decarbonization device absorbs heat and releases carbon dioxide and water vapor. The carbon dioxide and water vapor enter the waste heat recovery device, which uses the return water from the heat network to recover the heat, condense the water vapor, and then purify the carbon dioxide and compress it for storage. The other part of the exhaust steam from the steam turbine continues to heat the water supply to the heating network through the heat exchanger, and is heated to the water supply temperature and supplied to the heating network.

8. A method for operating a cogeneration system, used in the cogeneration system with integrated decarbonization and flue gas latent heat recovery according to any one of claims 1 to 4, characterized in that: The following steps are involved: The flue gas from the boiler directly enters the external facilities, and the exhaust steam from the turbine heats the water supply to the heating network, which is heated to the water supply temperature and then supplied to the heating network.

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