External heating device and method for waste incineration power plant and related equipment

Abstract

The invention discloses a device and method for external heating of a waste incineration power plant and related equipment, and relates to the field of waste heating. A dead steam inlet of the condenser is connected with a dead steam outlet of the steam turbine through a dead steam pipeline, and a heating water pipeline for exchanging heat with dead steam is arranged in the condenser; a dead steam condensation water outlet of the condenser is connected with a condensation water inlet of the deaerator through a first condensation water pipeline, and a condensation water pump is arranged in the first condensation water pipeline; a steam inlet of the deaerator is connected with a steam outlet of the steam turbine through a first steam pipeline, and steam extracted by the steam turbine is obtained to heat and deoxidize dead steam condensation water; a condensed water outlet of the deaerator is connected with a water inlet of the boiler through a water pipeline, and a water pump is arranged in the water pipeline. The dead steam of the steam turbine is adopted as a heating source, the steam demand of the deaerator is smaller than that of the heating water, the amount of steam extracted by the steam turbine is reduced, and the power generation loss of the steam turbine is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of waste heating, and in particular to a device, method and related equipment for external heating of a waste incineration power plant. Background Art

[0002] With the development of technology, energy consumption is increasing day by day. Due to the limited reserves and mining capacity of energy resources, people have begun to vigorously promote the development of renewable energy utilization technology in order to avoid energy crisis and reduce dependence on and consumption of limited fossil energy such as oil and natural gas. Among them, renewable energy utilization technology includes waste incineration power generation.

[0003] In a waste incineration power plant, the burning of waste in the incinerator generates a large amount of heat energy, which is transferred to the water in the boiler, converting the water in the boiler into high-temperature and high-pressure steam. The steam enters the steam turbine to do work, pushing the turbine blades to rotate, thereby driving the generator to generate electricity. At present, the steam obtained from the waste incineration heating boiler can be used not only for power generation, but also for heating people during the heating period.

[0004] During the heating period, the steam turbine extracts part of the steam and transports it to the heating network heater to heat the water in the heating network. When the water temperature in the heating network reaches the required temperature for heating, it provides heat to the outside. Since the steam extracted by the steam turbine during the heating period is the steam that has not completely done work in the steam turbine, the more steam extracted during the heating period, the greater the power generation loss of the steam turbine. Therefore, how to effectively reduce the power generation loss of the steam turbine during the heating period is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above problems, the present application provides a device, method and related equipment for external heating of a waste incineration power plant, so as to effectively reduce the power generation loss of the steam turbine during the heating period. The specific scheme is as follows:

[0006] In a first aspect, the present application provides a device for external heating of a waste incineration power plant, the device for external heating of a waste incineration power plant comprising: a condenser and a deaerator;

[0007] The condenser has an exhaust steam inlet and an exhaust steam condensate outlet, the exhaust steam inlet of the condenser is connected to the exhaust steam outlet of the steam turbine through an exhaust steam pipeline, and the condenser has a heating water pipeline for heat exchange with the exhaust steam;

[0008] The exhaust steam condensate outlet of the condenser is connected to the condensate inlet of the deaerator through a first condensate pipeline, the exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser, and a condensate pump is provided in the first condensate pipeline;

[0009] The steam inlet of the deaerator is connected to the steam outlet of the steam turbine through a first steam pipeline, and the steam extracted from the steam turbine is obtained to heat and deoxidize the exhaust steam condensate;

[0010] The condensate outlet of the deaerator is connected to the water inlet of the boiler through a water pipeline, so that the boiler heats the exhaust condensate transported by the deaerator to generate steam. A water pump is provided in the water pipeline.

[0011] In a possible implementation, the heating water pipeline in the condenser is divided into a water outlet side pipeline and a water return side pipeline, and the device for external heating of the waste incineration power plant further includes a peak supplementary heat device, the peak supplementary heat device has a supplementary hot water pipeline, the supplementary hot water pipeline has a heating water inlet and a heating water outlet, and the peak supplementary heat device has a steam inlet and a steam condensate outlet;

[0012] The heating water inlet of the hot water supply pipeline is connected to the outlet side pipeline of the condenser through a heat supply pipeline, so that the heating water after heat exchange with the exhaust steam enters the peak heat supply device, and a heat network circulating water pump is arranged in the heat supply pipeline;

[0013] The heating water outlet of the hot water supply pipeline is connected to the heating network;

[0014] The steam inlet of the peak heat replenisher is connected to the steam outlet of the steam turbine through a second steam pipeline, and the steam extracted from the steam turbine is obtained to replenish the heating water entering the peak heat replenisher;

[0015] The steam condensate outlet of the peak heat exchanger is connected to the condensate inlet of the deaerator through a second condensate pipeline, and the steam condensate is the condensate obtained by condensing the steam after heat exchange in the peak heat exchanger.

[0016] In a possible implementation, the device for external heating of the waste incineration power plant also includes a drain tank for storing steam condensate transported by the peak heat exchanger, the drain tank is arranged on the second condensate pipeline between the peak heat exchanger and the deaerator, and a drain pump is arranged on the second condensate pipeline between the drain tank and the deaerator.

[0017] In a possible implementation, the device for external heating of a waste incineration power plant further includes a water softener and a softened water tank, the water softener has a water outlet and a water inlet, and the softened water tank has a water outlet and a water inlet;

[0018] The water inlet of the water softener is connected to a tap water pipe, so as to obtain tap water from the tap water pipe and make softened water. A solenoid valve is arranged in the tap water pipe;

[0019] The water outlet of the water softener is connected to the water inlet of the softened water tank through a softened water pipeline;

[0020] The water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump;

[0021] The water inlet of the softening water tank is also connected to the heating water outlet side pipeline of the heating network through a first connecting pipe, and the connecting pipe is provided with a solenoid valve and a filter.

[0022] In a possible implementation, a second connecting pipe is provided between the heating return water side pipeline of the heating network and the heating outlet water side pipeline of the heating network, and an electric regulating valve is provided on the second connecting pipe.

[0023] In a possible implementation, a connecting pipeline is provided between the heating return water side pipeline of the heating network and the shaft seal heater of the steam turbine.

[0024] The second aspect of the present application provides a method for external heating of a waste incineration power plant, which is applied to the device for external heating of a waste incineration power plant according to the first aspect or any implementation of the first aspect. The method for external heating of a waste incineration power plant comprises:

[0025] Controlling the condenser to open, so that the condenser obtains exhaust steam discharged from the turbine from the exhaust steam pipeline, uses the exhaust steam to perform heat exchange with the heating water pipeline, and transmits exhaust steam condensate to the first condensate pipeline, where the exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser;

[0026] Controlling the condensate pump to start, and conveying the exhaust steam condensate in the first condensate pipeline to the deaerator;

[0027] Controlling the deaerator to start, and controlling the steam extracted from the steam turbine to be transported to the steam pipeline, so that the deaerator obtains the steam extracted from the steam turbine from the steam pipeline, uses the steam to heat and deoxygenate the exhaust steam condensate, and transports the heated and deoxygenated exhaust steam condensate to the water pipeline;

[0028] The water pump is controlled to start, and the exhaust steam condensate after heating and deoxygenation in the water pipeline is transported to the boiler, so that the boiler heats the exhaust steam condensate transported by the deaerator to generate steam.

[0029] In a possible implementation, the heating water pipeline in the condenser is divided into an outlet side pipeline and a return side pipeline, the peak supplementary heat device is provided with a supplementary hot water pipeline, the supplementary hot water pipeline has a heating water inlet and a heating water outlet, and the peak supplementary heat device has a steam inlet and a steam condensate outlet; the heating water inlet of the supplementary hot water pipeline is connected to the outlet side pipeline of the condenser through a supplementary heat pipeline, a heat network circulating water pump is provided in the supplementary heat pipeline, the heating water outlet of the supplementary hot water pipeline is connected to the heating network, the steam inlet of the peak supplementary heat device is connected to the steam outlet of the steam turbine through a second steam pipeline, the steam condensate outlet of the peak supplementary heat device is connected to the condensate inlet of the deaerator through a second condensate pipeline, a drain tank is provided on the second condensate pipeline between the peak supplementary heat device and the deaerator, and a drain pump is provided on the second condensate pipeline between the drain tank and the deaerator;

[0030] The method for external heating of a waste incineration power plant also includes:

[0031] Control the peak heat replenisher to start, and transport the heating water after heat exchange with the exhaust steam in the condenser to the hot water replenishment pipeline in the peak heat replenisher through the heat network circulating water pump;

[0032] Control the steam extracted by the steam turbine to be transported to the steam pipeline, so that the peak heat replenisher obtains the steam extracted by the steam turbine from the steam pipeline, uses the steam to replenish the heating water in the replenishment hot water pipeline, and transports the heated heating water to the heating network to provide heating for users;

[0033] The drain tank is opened to automatically collect the steam condensate in the peak heat exchanger. When the steam condensate stored in the drain tank exceeds the storage liquid level, the drain pump is controlled to start and the steam condensate is transported to the deaerator through the second condensate pipeline. The steam condensate is the condensate obtained by condensing the steam after heat exchange in the peak heat exchanger.

[0034] In a possible implementation, the water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump;

[0035] The method for external heating of a waste incineration power plant also includes:

[0036] The water supply pump is controlled to start, and the softened water in the softened water tank is supplied to the heating return water side pipeline of the heating network through the softened water pipeline.

[0037] A third aspect of the present application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:

[0038] The memory is used to store computer programs;

[0039] The processor is used to execute the computer program so that the electronic device can implement the method for external heating of a waste incineration power plant according to the above-mentioned second aspect or any implementation method of the second aspect.

[0040] By means of the above technical scheme, the present application provides a device, method and related equipment for external heating of a waste incineration power plant. The heating device uses the exhaust steam discharged from the steam turbine in the condenser to heat the heating water in the heating water pipeline, without the need for the steam turbine to extract steam to heat the heating water, thereby reducing the power generation loss of the steam turbine. The exhaust steam condensate is transported to the deaerator through the condensate pump in the condensate pipeline. The deaerator obtains the steam extracted by the steam turbine through the steam pipeline to heat and deoxygenate the exhaust steam condensate. Since the steam demand of the deaerator is less than the steam demand of the heating water, the impact of the deaerator on the steam turbine power generation is smaller than the impact on the steam turbine power generation during the heating period. The exhaust steam condensate after the deaerator is heated is transported to the boiler for heating again through the water pump in the water pipeline to generate steam, which reflects the thermal cycle of the waste incineration power plant. This device uses the exhaust steam of the steam turbine as the heating heat source during the heating period. The amount of steam extracted from the steam turbine is reduced, and the steam demand of the deaerator is less than the steam demand of the heating water. Therefore, this device can effectively reduce the power generation loss of the steam turbine during the heating period. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0042] Figure 1 A schematic diagram of the structure of a device for external heating of a waste incineration power plant provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of another device for external heating of a waste incineration power plant provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of a flow chart of a method for external heating of a waste incineration power plant provided in an embodiment of the present application;

[0045] Figure 4 A complete structural diagram of a waste incineration power plant heating system provided in an embodiment of the present application;

[0046] Figure 5 A hardware structure block diagram of an electronic device provided in this application. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0048] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0049] The terms "first", "second" etc. in the specification of the application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable in appropriate circumstances, and this is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0050] A waste incineration power plant, also known as a waste incineration power plant or a waste-to-energy conversion plant, is a facility that converts domestic waste and other waste into electricity and heat through high-temperature incineration. Its working principle is: the waste is sent to the incinerator for high-temperature incineration. The heat generated during the incineration process heats the boiler, converting the water in the boiler into high-temperature and high-pressure steam, which in turn drives the turbine to rotate and drives the generator to generate electricity. The high-temperature and high-pressure steam can also heat the water in the heating network during the heating period to provide heating for users.

[0051] At present, during the heating period, steam is mainly extracted by steam turbines for heating. The steam extracted by the steam turbine is the steam that has not completely done work in the steam turbine. The more steam is extracted during the heating period, the more the steam work capacity is lost, and the greater the power generation loss of the steam turbine. Therefore, the power generation loss of the steam turbine during the heating period is relatively large.

[0052] In order to solve the above problems, an embodiment of the present application provides a device for external heating of a waste incineration power plant, which can use the waste heat after the steam turbine generates electricity (exhaust steam discharged from the steam turbine) to provide heating for users. Since the waste incineration power plant has multiple heat losses during operation, such as smoke exhaust loss, cold source loss, mechanical incomplete combustion loss and chemical incomplete combustion loss. Among them, the cold source loss refers to the exhaust steam discharged by the steam turbine condensing in the condenser to form condensed water, and the heat carried away by the cooling circulating water. This part of heat can account for 50% of the heat generated by waste incineration. Therefore, this embodiment can use this part of heat for external heating, reduce the use of steam extracted by the steam turbine, and effectively reduce the power generation loss of the steam turbine during the heating period.

[0053] The following is a detailed introduction to the device for external heating of a waste incineration power plant in accordance with an embodiment of the present application in conjunction with the accompanying drawings.

[0054] Reference Figure 1 , Figure 1 A schematic diagram of a structure of a device for external heating of a waste incineration power plant provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, an apparatus for external heating of a waste incineration power plant provided in an embodiment of the present application may include a condenser and a deaerator.

[0055] The condenser has an exhaust steam inlet and an exhaust steam condensate outlet. The exhaust steam inlet of the condenser is connected to the exhaust steam outlet of the steam turbine through an exhaust steam pipeline. The condenser has a heating water pipeline for heat exchange with the exhaust steam.

[0056] The exhaust steam condensate outlet of the condenser is connected to the condensate inlet of the deaerator through the first condensate pipeline. The exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser. A condensate pump is provided in the first condensate pipeline.

[0057] The steam inlet of the deaerator is connected to the steam outlet of the steam turbine through the first steam pipeline, and the steam extracted from the steam turbine is obtained to heat and deoxidize the exhaust steam condensate;

[0058] The condensate outlet of the deaerator is connected to the water inlet of the boiler through a water pipeline, so that the boiler heats the exhaust steam condensate transported by the deaerator to generate steam. A water pump is provided in the water pipeline.

[0059] Among them, the condenser is a device for cooling steam or gas into a liquid state. The condenser uses a coolant (air or water) to exchange heat with steam or gas, so that the temperature of the steam or gas is reduced and condensed into a liquid. In this embodiment, the circulating cooling water of the cooling tower has a switching function during the heating period and the non-heating period, which can ensure the complete isolation of the use of cooling water during the heating period and the non-heating period. Specifically, during the heating period of this embodiment, the cooling water in the cooling tower can enter the heating pipe network to prevent the cooling water in the cooling tower from entering the condenser, thereby taking away the heat of the exhaust steam in the condenser. During the non-heating period, the cooling water in the cooling tower can enter the condenser to cool the exhaust steam in the condenser, and the exhaust steam condensate can enter the deaerator for heating and deoxygenation. Therefore, the heating device of this embodiment can switch between the heating period and the non-heating period to ensure the economic operation of the heating device during the non-heating period.

[0060] During the heating period, the exhaust steam in the condenser exchanges heat with the heating water pipeline additionally provided in the condenser to heat the heating water in the heating water pipe. The exhaust steam condensed water obtained by condensation after the exhaust steam exchanges heat with the heating water pipeline can be transported to the deaerator through the first condensed water pipeline. Among them, the heating water pipeline in the condenser is part of the heating network. After the heating water indirectly exchanges heat with the exhaust steam in the heating water pipeline in the condenser, it enters the heating network to heat the users.

[0061] As a boiler auxiliary equipment, the deaerator is a device that removes oxygen dissolved in condensate water. Its main function is to remove oxygen from water and then transport the heated and deoxygenated water to the boiler, thereby slowing down the oxidation corrosion rate inside the boiler and extending the life of the boiler.

[0062] In this embodiment, the deaerator can obtain the exhaust steam condensate in the condenser during the heating period, and heat and deoxygenate the exhaust steam condensate. The heating heat source of the deaerator in this embodiment is part of the steam extracted from the steam turbine. Since the steam demand of the deaerator is less than the steam demand of the heating water during the heating period, the deaerator has a smaller impact on the steam turbine power generation than the impact of the heating water on the steam turbine power generation, and can effectively reduce the power generation loss of the steam turbine during the heating period.

[0063] After the deaerator heats and deoxygenates the exhaust steam condensate, it can be transported to the boiler through the water pump in the water pipeline. The boiler heats the exhaust steam condensate to generate high-temperature steam, which is sent to the steam turbine to achieve circulation.

[0064] The embodiment of the present application provides a device for external heating of a waste incineration power plant. The heating device uses the exhaust steam discharged from the turbine in the condenser to heat the heating water in the heating water pipeline. There is no need for the turbine to extract steam to heat the heating water, thereby reducing the power generation loss of the turbine. Using the exhaust steam of the steam turbine for external heating can not only meet the heating needs of users, but also improve the comprehensive energy utilization rate and cycle thermal efficiency of the waste incineration power plant, thereby improving the operating efficiency of the enterprise. In addition, waste heat (exhaust steam) heating is also in line with the spirit of energy conservation and emission reduction, and can replace small coal-fired boilers to effectively control smog weather, which is conducive to reducing atmospheric environmental pressure.

[0065] The exhaust steam condensate is transported to the deaerator through the condensate pump in the condensate pipeline. The deaerator obtains the steam extracted from the steam turbine through the steam pipeline and heats and deoxidizes the exhaust steam condensate. Since the steam demand of the deaerator is less than the steam demand of the heating water, the impact of the deaerator on the steam turbine power generation is smaller than the impact on the steam turbine power generation during the heating period. The exhaust steam condensate after the heating treatment of the deaerator is transported to the boiler for heating again through the water pump in the water pipeline to generate steam, which reflects the thermal cycle of the waste incineration power plant. This device uses the exhaust steam of the steam turbine as the heating heat source during the heating period, reducing the use of steam extracted from the steam turbine, and this device appropriately increases the exhaust pressure of the steam turbine, thereby increasing the exhaust steam temperature (exhaust steam temperature) of the steam turbine, and the temperature of the exhaust steam condensate will also increase. The increase in the temperature of the exhaust steam condensate can reduce the steam demand of the deaerator when heating and deoxygenating the exhaust steam condensate during the heating period, and the steam demand of the deaerator is less than the steam demand of the heating water. Therefore, the amount of steam extracted from the turbine is reduced. The device can effectively reduce the power generation loss of the turbine during the heating period.

[0066] In one possible implementation, Figure 2 As shown, the heating water pipeline in the condenser is divided into a water outlet side pipeline and a return water side pipeline. The device for external heating of the waste incineration power plant also includes a peak supplementary heat device, the peak supplementary heat device has a supplementary hot water pipeline, the supplementary hot water pipeline has a heating water inlet and a heating water outlet, and the peak supplementary heat device has a steam inlet and a steam condensate outlet;

[0067] The heating water inlet of the hot water supply pipeline is connected to the outlet side pipeline of the condenser through the heating supply pipeline, so that the heating water after heat exchange with the exhaust steam enters the peak heating device. A heat network circulating water pump is arranged in the heating supply pipeline.

[0068] The heating water outlet of the hot water supply pipeline is connected to the heating network;

[0069] The steam inlet of the peak heat exchanger is connected to the steam outlet of the steam turbine through the second steam pipeline, and the steam extracted from the steam turbine is obtained to heat the heating water entering the peak heat exchanger;

[0070] The steam condensate outlet of the peak heat exchanger is connected to the condensate inlet of the deaerator through a second condensate pipeline. The steam condensate is condensate obtained by condensing steam after heat exchange in the peak heat exchanger.

[0071] Among them, the heating period as a whole can be divided into the initial stage, the extreme cold stage and the final stage. Among them, the extreme cold stage of the heating period can be generally considered to be a period when the outdoor temperature reaches the lowest and the weather is the coldest. In the extreme cold stage of the heating period, the heating intensity needs to be increased to ensure that the indoor temperature remains within a comfortable range. Since it is difficult to ensure heating only by the exhaust steam of the steam turbine during the extreme cold stage of the heating period, the present embodiment also provides a peak heater to increase the heating intensity through the peak heater. Of course, except for the extreme cold stage of the heating period, during the heating period, as long as the exhaust steam of the steam turbine is difficult to ensure heating, the peak heater can be used to supplement heat to ensure heating. Since this embodiment only uses steam extracted from the steam turbine for supplementary heating during the extreme cold period or when the exhaust steam is difficult to ensure heating, the amount of steam required is less than that of steam extracted from the steam turbine for heating during the entire heating period. Therefore, this embodiment can effectively reduce the power generation loss of the steam turbine during the heating period.

[0072] The peak heater is a local heating device that can quickly heat the heating water to the heating temperature in a short time. In this embodiment, the heating heat source of the peak heater is part of the steam extracted from the steam turbine. Of course, the peak heater can also use a resistor as a heating element to convert electrical energy into thermal energy through a heating wire. In this embodiment, a make-up hot water pipeline is provided in the peak heater. The make-up hot water pipeline is filled with heating water heated by exhaust steam in the condenser. The peak heater obtains steam extracted from the steam turbine through the second steam pipeline. The steam exchanges heat with the make-up hot water pipeline in the peak heater to achieve make-up heat for the heating water heated by exhaust steam in the condenser. The heated heating water is then transported to the heating network to provide heating for users.

[0073] In the peak heat exchanger, the steam after heat exchange with the hot water pipeline can be condensed into steam condensate, and is also sent to the deaerator for heating and deoxygenation, and then sent to the boiler for heating and circulation. Of course, when the steam is condensed in the peak heat exchanger, the heat released can also be used for subsequent heating of the peak heat exchanger, so that the peak heat exchanger can appropriately reduce the required steam demand.

[0074] Furthermore, in order to prevent the water level in the deaerator from being too high, thereby affecting the turbine and boiler, Figure 2As shown, in this embodiment, a drain tank can also be arranged on the second condensate pipeline between the peak heat exchanger and the deaerator, and a drain pump is arranged on the second condensate pipeline between the drain tank and the deaerator. The drain tank is used to store the steam condensate delivered by the peak heat exchanger. When the steam condensate stored in the drain tank exceeds the storage liquid level, the drain pump delivers the steam condensate to the deaerator through the second condensate pipeline.

[0075] In one possible implementation, Figure 2 As shown, the device for external heating of the waste incineration power plant also includes a water softener and a softened water tank, the water softener has a water outlet and a water inlet, and the softened water tank has a water outlet and a water inlet;

[0076] The water inlet of the water softener is connected to the tap water pipe, so as to obtain tap water from the tap water pipe and make softened water. The tap water pipe is provided with a solenoid valve;

[0077] The water outlet of the water softener is connected to the water inlet of the softened water tank through a softened water pipeline;

[0078] The water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump;

[0079] The water inlet of the softening water tank is also connected to the heating water outlet side pipeline of the heating network through a first connecting pipe, and the connecting pipe is provided with a solenoid valve and a filter.

[0080] Among them, softened water refers to water that is made more suitable for life, production and industrial use by removing or reducing the content of metal ions such as calcium and magnesium in water, thereby reducing the hardness of water. The water softener is a fully automatic water softener. The water softener can use sodium-type cation exchange resin to remove calcium and magnesium ions in water. When tap water containing hardness passes through the resin layer of the exchanger, the calcium and magnesium ions in the tap water are adsorbed by the resin, and sodium ions are released at the same time, thereby obtaining softened water with hardness ions removed. The softened water tank is a device for storing softened water. The water softener obtains tap water from the tap water pipe, and the tap water is made into softened water through the water softener and stored in the softened water tank.

[0081] In the early stage of heating, due to the long-term outage of the heating network, some impurities will be deposited in the pipes of the heating network, resulting in unqualified water quality of the heating water. Therefore, it is necessary to flush the entire heating network until the water quality of the heating network is qualified to improve the heat conduction efficiency of the heating pipeline. In this embodiment, the softening water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline. During the operation of the heating network in the heating period, softened water is extracted from the softening water tank by the water replenishment pump on the softening water pipeline, and is added to the heating return water side pipeline of the heating network to flush the heating network. Since the temperature of softened water is lower than the temperature of heating return water, while replenishing water to the heating return water side pipeline of the heating network, the temperature of the heating water in the heating return water side pipeline can also be reduced. In the condenser, the heat taken away by the heating water is fixed, and the temperature rise of the heating water is fixed. When the heating return water temperature is lowered, the heating outlet water temperature is also reduced synchronously. Affected by the reduction in the heating outlet water temperature, the exhaust steam temperature of the steam turbine is also reduced synchronously. The exhaust pressure of the steam turbine also decreases with the reduction in the exhaust steam temperature, resulting in an increase in the enthalpy drop of the steam in the steam turbine, an increase in the work done by the steam in the steam turbine, and an increase in the power generation of the steam turbine. Therefore, when softened water is used to replenish the heating return water side pipeline of the heating network, the heating water temperature in the heating return water side pipeline is reduced, which can effectively reduce the operating back pressure of the steam turbine during the heating period, thereby increasing the power generation income of the steam turbine during the heating period.

[0082] like Figure 2 As shown, in addition to connecting the softened water tank to the heating return water side pipeline of the heating network, this embodiment also connects the softened water tank to the heating outlet water side pipeline of the heating network through a first connecting pipe, and a solenoid valve and a filter are set in the first connecting pipeline. During the shutdown of the heating network, the heating water in the heating network can be recovered to the softened water tank by opening the solenoid valve to prevent the waste of the working fluid, and the sediment or impurities in the heating water can be filtered through the filter. Of course, when the heating return water pressure of the heating network is overpressured, the heating water in the heating network can also be discharged into the softened water tank by opening the solenoid valve to relieve the pressure of the heating network and protect the heating network.

[0083] In one possible implementation, Figure 2 As shown, a second connecting pipe is arranged between the heating return water side pipeline of the heating network and the heating outlet water side pipeline of the heating network, and an electric regulating valve is arranged on the second connecting pipe.

[0084] In addition to adding softened water to adjust the temperature of the heating water, this embodiment sets a second connecting pipe between the heating return water side pipeline of the heating pipe network and the heating outlet water side pipeline of the heating pipe network, and adjusts the opening of the electric regulating valve on the second connecting pipe to adjust the temperature of the heating outlet water by using the heating return water. At the same time, during the maintenance of the condenser failure, this embodiment can also separate the faulty condenser from the heating pipe network by connecting the second connecting pipe, which is convenient for the maintenance of the condenser.

[0085] In a possible implementation, a connecting pipeline is provided between the heating return water side pipeline of the heating network and the shaft seal heater of the steam turbine.

[0086] Among them, the shaft seal heater, also known as the shaft seal cooler or steam seal heater, is a device that recovers the leakage steam of the shaft seal and uses condensed water to cool the leakage of the shaft seal. It is mainly used in steam turbines or other equipment that requires shaft seal sealing. Since this embodiment appropriately increases the exhaust pressure of the steam turbine in order to enable the exhaust steam of the steam turbine to heat the heating water to the required temperature for heating, the exhaust pressure of the steam turbine is increased, thereby increasing the exhaust temperature (exhaust steam temperature) of the steam turbine, but it also causes the temperature of the condensed water (steam condensed water or exhaust steam condensed water) to increase. The condensed water with increased temperature is difficult to be used as the cooling water source of the shaft seal heater at this time. Therefore, this embodiment adds a branch to the shaft seal heater in the heating return water side pipeline of the heating pipe network, and uses the heating return water with a lower temperature as the cooling water source of the shaft seal heater. Of course, the exhaust steam temperature of the steam turbine is not fixed. If the exhaust steam temperature of the steam turbine is sufficient to heat the heating water to the required temperature for heating, there is no need to increase the exhaust pressure of the steam turbine. At this time, the condensed water can be used as the cooling water source of the shaft seal heater.

[0087] The above introduces a device for external heating of a waste incineration power plant provided in an embodiment of the present application. The following will introduce a method for using the above-mentioned device for external heating of a waste incineration power plant.

[0088] See also Figure 3 , Figure 3 A schematic diagram of a method for external heating of a waste incineration power plant provided in an embodiment of the present application. Figure 3 As shown, the method for external heating of a waste incineration power plant comprises:

[0089] S10, controlling the condenser to open so that the condenser obtains exhaust steam discharged from the steam turbine from the exhaust steam pipeline, uses the exhaust steam to perform heat exchange with the heating water pipeline, and transmits exhaust steam condensate to the first condensate pipeline, where the exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser;

[0090] S11, control the condensate pump to start, and transport the exhaust steam condensate in the first condensate pipeline to the deaerator;

[0091] S12, controlling the deaerator to start, and controlling the steam extracted from the steam turbine to be transported to the steam pipeline, so that the deaerator obtains the steam extracted from the steam turbine from the steam pipeline, uses the steam to heat and deoxygenate the exhaust steam condensate, and transports the heated and deoxygenated exhaust steam condensate to the water pipeline;

[0092] S13, control the water pump to start, and transport the exhaust steam condensate after heating and deoxygenation in the water pipeline to the boiler, so that the boiler heats the exhaust steam condensate transported by the deaerator to generate steam.

[0093] The embodiment of the present application provides a method for external heating of a waste incineration power plant, which utilizes the exhaust steam of the steam turbine to perform heat exchange on the heating water pipeline, fully utilizes the low-quality waste heat discharged by the steam turbine, and no longer uses the steam extracted by the steam turbine for heating. In addition, the steam demand of the deaerator is less than the steam demand of the heating water, and the amount of steam extracted by the steam turbine is reduced. Therefore, this method can effectively reduce the power generation loss of the steam turbine during the heating period. In addition, the exhaust steam condensate is collected by the deaerator and transported to the boiler again to generate steam, realizing the thermal cycle of the waste incineration power plant.

[0094] In a possible implementation, the heating water pipeline in the condenser is divided into an outlet side pipeline and a return side pipeline, the peak supplementary heat device is provided with a supplementary hot water pipeline, the supplementary hot water pipeline has a heating water inlet and a heating water outlet, and the peak supplementary heat device has a steam inlet and a steam condensate outlet; the heating water inlet of the supplementary hot water pipeline is connected to the outlet side pipeline of the condenser through a supplementary heat pipeline, a heat network circulating water pump is provided in the supplementary heat pipeline, the heating water outlet of the supplementary hot water pipeline is connected to the heating network, the steam inlet of the peak supplementary heat device is connected to the steam outlet of the steam turbine through a second steam pipeline, the steam condensate outlet of the peak supplementary heat device is connected to the condensate inlet of the deaerator through a second condensate pipeline, the drain tank is provided on the second condensate pipeline between the peak supplementary heat device and the deaerator, and a drain pump is provided on the second condensate pipeline between the drain tank and the deaerator;

[0095] The method for external heating of a waste incineration power plant also includes:

[0096] Control the peak supplementary heater to start, and transport the heating water after heat exchange with the exhaust steam in the condenser to the supplementary hot water pipeline in the peak supplementary heater through the heat network circulating water pump;

[0097] Control the steam extraction from the steam turbine to be transported to the steam pipeline, so that the peak reheater obtains the steam extracted from the steam turbine from the steam pipeline, uses the steam to reheat the heating water in the reheating hot water pipeline, and transports the reheated heating water to the heating network to provide heating for users;

[0098] The drain tank is opened to automatically collect the steam condensate in the peak reheater. When the steam condensate stored in the drain tank exceeds the storage liquid level, the drain pump is controlled to start and the steam condensate is transported to the deaerator through the second condensate pipeline. The steam condensate is the condensate obtained by condensing the steam after heat exchange in the peak reheater.

[0099] In a possible implementation, the water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump;

[0100] The method for external heating of a waste incineration power plant also includes:

[0101] The water supply pump is controlled to start, and the softened water in the softened water tank is added to the heating return water side pipeline of the heating network through the softened water pipeline.

[0102] So far, a complete embodiment is provided to illustrate the operation process during the heating period. Figure 4 The complete structural diagram shown may include multiple equipment including boiler, steam turbine, condenser, deaerator, peak heater, drain tank and cooling tower.

[0103] The superheated steam generated by the boiler enters the steam turbine to perform work, and the steam turbine discharges exhaust steam. The exhaust steam enters the condenser to heat the heating water in the heating water pipeline. When the condenser heats the heating water to the heating demand temperature during the heating period, the heating water enters the heating network to provide heating for users. The exhaust steam condenses into exhaust steam condensate by releasing heat in the condenser, which is transported to the deaerator through the condensate pump. The deaerator uses the steam extracted from the steam turbine to heat and deoxygenate the exhaust steam condensate, and then transports the heated and deoxygenated exhaust steam condensate to the boiler through the water pump. The boiler heats the exhaust steam condensate, and superheated steam is formed again to enter the steam turbine to perform work.

[0104] During the extremely cold period of the heating period, the heating water is heated by exhaust steam in the condenser, and then sent to the peak supplementary heater through the heat network circulating water pump. The steam extracted from the steam turbine is used for supplementary heat. After the heating water temperature is raised to the heating temperature required during the extremely cold period, the heating water is sent to the heating network to provide heating for users. The steam condensed by the steam in the peak supplementary heater enters the drain tank for storage. When the steam condensate stored in the drain tank reaches a certain liquid level, the steam condensate is sent to the deaerator through the drain pump. The deaerator uses the steam extracted from the steam turbine to heat and deoxygenate the steam condensate, and then the heated and deoxygenated steam condensate is sent to the boiler through the water pump. The boiler heats the steam condensate, and superheated steam is formed again to enter the steam turbine to do work.

[0105] During the operation of the heating network, the water softener extracts tap water from the tap water pipe, makes softened water and stores it in the softened water tank. The softened water enters the heating return water side pipeline of the heating network through the water replenishment pump. During the shutdown of the heating network, the heating water in the heating outlet side pipeline of the heating network is recovered through the solenoid valve and enters the softened water tank after being filtered by the filter.

[0106] During the operation of the heating network, the heating return water portion in the heating return water side pipeline of the heating network is transported to the heating outlet water side pipeline of the heating network by adjusting the opening of the electric regulating valve on the second connecting pipe.

[0107] During the non-heating period, the cooling water in the cooling tower enters the condenser and absorbs the heat of the exhaust steam. The exhaust steam is condensed and cooled. The cooling water that absorbs the heat of the exhaust steam enters the cooling tower for cooling and enters the condenser again to absorb the heat of the exhaust steam, thus circulating.

[0108] The present application also provides an electronic device in an embodiment. Figure 5 As shown, it shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as mobile phones, laptops, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 5 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0109] like Figure 5 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 to a random access memory (RAM) 503. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 503. The processing device 501, the ROM 502, and the RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0110] Typically, the following devices may be connected to the I / O interface 505: an input device 506 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 507 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 508 including, for example, a memory card, a hard disk, etc.; and a communication device 509. The communication device 509 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0111] Also provided in an embodiment of the present application is a computer program product, including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the methods for external heating of a waste incineration power plant provided in the embodiments of the present application.

[0112] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When one or more computer programs are executed by an electronic device, the electronic device can implement any one of the methods for external heating of a waste incineration power plant provided in an embodiment of the present application.

[0113] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0114] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0115] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

[0116] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0117] It is understandable that before using the technical solutions disclosed in the embodiments of the present disclosure, the types, scope of use, usage scenarios, etc. of the personal information involved in the present disclosure should be informed to the user and the user's authorization should be obtained in an appropriate manner in accordance with relevant laws and regulations.

[0118] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for external heating of a waste incineration power plant, characterized in that: The device for external heating of the waste incineration power plant includes: a condenser and a deaerator; The condenser has an exhaust steam inlet and an exhaust steam condensate outlet, the exhaust steam inlet of the condenser is connected to the exhaust steam outlet of the steam turbine through an exhaust steam pipeline, and the condenser has a heating water pipeline for heat exchange with the exhaust steam; The exhaust steam condensate outlet of the condenser is connected to the condensate inlet of the deaerator through a first condensate pipeline, the exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser, and a condensate pump is provided in the first condensate pipeline; The steam inlet of the deaerator is connected to the steam outlet of the steam turbine through a first steam pipeline, and the steam extracted from the steam turbine is obtained to heat and deoxidize the exhaust steam condensate; The condensate outlet of the deaerator is connected to the water inlet of the boiler through a water pipeline, so that the boiler heats the exhaust condensate transported by the deaerator to generate steam. A water pump is provided in the water pipeline.

2. The device for external heating of a waste incineration power plant according to claim 1 is characterized in that: The heating water pipeline in the condenser is divided into a water outlet side pipeline and a return side pipeline. The device for external heating of the waste incineration power plant also includes a peak supplementary heat device, the peak supplementary heat device has a supplementary hot water pipeline, the supplementary hot water pipeline has a heating water inlet and a heating water outlet, and the peak supplementary heat device has a steam inlet and a steam condensate outlet; The heating water inlet of the hot water supply pipeline is connected to the outlet side pipeline of the condenser through a heat supply pipeline, so that the heating water after heat exchange with the exhaust steam enters the peak heat supply device, and a heat network circulating water pump is arranged in the heat supply pipeline; The heating water outlet of the hot water supply pipeline is connected to the heating network; The steam inlet of the peak heat replenisher is connected to the steam outlet of the steam turbine through a second steam pipeline, and the steam extracted from the steam turbine is obtained to replenish the heating water entering the peak heat replenisher; The steam condensate outlet of the peak heat exchanger is connected to the condensate inlet of the deaerator through a second condensate pipeline, and the steam condensate is the condensate obtained by condensing the steam after heat exchange in the peak heat exchanger.

3. The device for external heating of a waste incineration power plant according to claim 2 is characterized in that: The device for external heating of the waste incineration power plant also includes a drain tank for storing steam condensate transported by the peak heat exchanger. The drain tank is arranged on the second condensate pipeline between the peak heat exchanger and the deaerator. A drain pump is arranged on the second condensate pipeline between the drain tank and the deaerator.

4. The device for external heating of a waste incineration power plant according to claim 1 is characterized in that: The device for external heating of a waste incineration power plant also includes a water softener and a softened water tank, wherein the water softener has a water outlet and a water inlet, and the softened water tank has a water outlet and a water inlet; The water inlet of the water softener is connected to a tap water pipe, so as to obtain tap water from the tap water pipe and make softened water. A solenoid valve is arranged in the tap water pipe; The water outlet of the water softener is connected to the water inlet of the softened water tank through a softened water pipeline; The water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump; The water inlet of the softening water tank is also connected to the heating water outlet side pipeline of the heating network through a first connecting pipe, and the connecting pipe is provided with a solenoid valve and a filter.

5. The device for external heating of a waste incineration power plant according to claim 1 is characterized in that: A second connecting pipe is arranged between the heating return water side pipeline of the heating pipe network and the heating outlet water side pipeline of the heating pipe network, and an electric regulating valve is arranged on the second connecting pipe.

6. The device for external heating of a waste incineration power plant according to claim 1 is characterized in that: A connecting pipeline is arranged between the heating return water side pipeline of the heating pipeline network and the shaft seal heater of the steam turbine.

7. A method for external heating of a waste incineration power plant, characterized in that: The device for external heating of a waste incineration power plant applied to any one of claims 1 to 6, the method for external heating of a waste incineration power plant comprising: Controlling the condenser to open, so that the condenser obtains exhaust steam discharged from the turbine from the exhaust steam pipeline, uses the exhaust steam to perform heat exchange with the heating water pipeline, and transmits exhaust steam condensate to the first condensate pipeline, where the exhaust steam condensate is condensate obtained by condensing the exhaust steam after heat exchange in the condenser; Controlling the condensate pump to start, and conveying the exhaust steam condensate in the first condensate pipeline to the deaerator; Controlling the deaerator to start, and controlling the steam extracted from the steam turbine to be transported to the steam pipeline, so that the deaerator obtains the steam extracted from the steam turbine from the steam pipeline, uses the steam to heat and deoxygenate the exhaust steam condensate, and transports the heated and deoxygenated exhaust steam condensate to the water pipeline; The water pump is controlled to start, and the exhaust steam condensate after heating and deoxygenation in the water pipeline is transported to the boiler, so that the boiler heats the exhaust steam condensate transported by the deaerator to generate steam.

8. The method for external heating of a waste incineration power plant according to claim 7, characterized in that: The heating water pipeline in the condenser is divided into an outlet side pipeline and a return side pipeline. The peak supplementary heat device is provided with a supplementary hot water pipeline, and the supplementary hot water pipeline has a heating water inlet and a heating water outlet. The peak supplementary heat device has a steam inlet and a steam condensate outlet. The heating water inlet of the supplementary hot water pipeline is connected to the outlet side pipeline of the condenser through a supplementary heat pipeline. A heat network circulating water pump is provided in the supplementary heat pipeline. The heating water outlet of the supplementary hot water pipeline is connected to the heating network. The steam inlet of the peak supplementary heat device is connected to the steam outlet of the steam turbine through a second steam pipeline. The steam condensate outlet of the peak supplementary heat device is connected to the condensate inlet of the deaerator through a second condensate pipeline. The drain tank is provided on the second condensate pipeline between the peak supplementary heat device and the deaerator. A drain pump is provided on the second condensate pipeline between the drain tank and the deaerator. The method for external heating of a waste incineration power plant also includes: Control the peak heat replenisher to start, and transport the heating water after heat exchange with the exhaust steam in the condenser to the hot water replenishment pipeline in the peak heat replenisher through the heat network circulating water pump; Control the steam extracted by the steam turbine to be transported to the steam pipeline, so that the peak heat replenisher obtains the steam extracted by the steam turbine from the steam pipeline, uses the steam to replenish the heating water in the replenishment hot water pipeline, and transports the heated heating water to the heating network to provide heating for users; The drain tank is opened to automatically collect the steam condensate in the peak heat exchanger. When the steam condensate stored in the drain tank exceeds the storage liquid level, the drain pump is controlled to start and the steam condensate is transported to the deaerator through the second condensate pipeline. The steam condensate is the condensate obtained by condensing the steam after heat exchange in the peak heat exchanger.

9. The method for external heating of a waste incineration power plant according to claim 7, characterized in that: The water outlet of the softened water tank is connected to the heating return water side pipeline of the heating network through a softened water pipeline provided with a water supply pump; The method for external heating of a waste incineration power plant also includes: The water supply pump is controlled to start, and the softened water in the softened water tank is supplied to the heating return water side pipeline of the heating network through the softened water pipeline.

10. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for external heating of a waste incineration power plant as described in any one of claims 7 to 9.

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