Heat supply system and method

Abstract

The invention provides a heat supply system and method, and belongs to the technical field of energy recycling. The heat supply system comprises a coal-fired power generation unit and a heat supply pipe network connected with the coal-fired power generation unit, and further comprises a waste incineration unit coupled with the coal-fired power generation unit. The waste incineration unit and the coal-fired power generation unit are both connected with a heat supply initial station of the heat supply pipe network. The waste incineration unit comprises a waste incinerator and a waste heat boiler, the waste incinerator is used for incinerating municipal waste to generate high-temperature flue gas, and the waste heat boiler heats water in the waste heat boiler through the generated high-temperature flue gas to generate high-temperature steam. The coal-fired power generation unit comprises a coal-fired boiler used for generating high-temperature steam; when the coal-fired power generation unit is in a normal operation state, the heat supply initial station of the heat supply pipe network receives high-temperature steam generated by the coal-fired power generation unit, and when the coal-fired power generation unit is in a low-load operation state, the heat supply initial station of the heat supply pipe network receives high-temperature steam generated by the waste incineration unit.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery and utilization, and in particular to a heating system and a heating method. Background Art

[0002] The amount of urban domestic waste has increased dramatically. A large amount of urban waste will produce chemical reactions, release toxic gases, cause air pollution, and cause smog weather. In addition, the garbage contains many harmful bacteria, which can easily breed infectious viruses and affect the health of residents. Therefore, the treatment of urban waste has become an urgent problem to be solved in today's society.

[0003] At present, underground burial for urban waste treatment has major drawbacks. Pollutants such as heavy metals produced when bacteria in urban waste decay and dissolve and seep into the ground will also cause soil and groundwater pollution. Another method is to build a new garbage power plant to incinerate garbage. However, there are many contradictions and conflicts with local residents in the site selection and land planning of the new garbage power plant. In addition, the new garbage power plant needs to invest in the construction of steam turbines, generators, exciters, main transformers, heating pipe network systems, auxiliary water production systems, and compressed air systems in addition to the garbage incineration boilers, and the subsequent investment costs are high. Summary of the invention

[0004] In order to solve the above-mentioned technical defects, the present invention provides a heating system and a heating method. The heating system includes a garbage incineration unit, a coal-fired power generation unit and a heating pipeline network. The heating system incinerates urban garbage by the garbage incineration unit to generate high-temperature steam, and burns raw coal by the coal-fired power generation unit to generate high-temperature steam. The high-temperature steam generated by the garbage incineration unit or the high-temperature steam generated by the coal-fired power generation unit is used to provide heating for heat users, thereby solving the harm of a large number of urban garbage dumps to the environment and realizing energy recovery and utilization.

[0005] A first aspect of the present invention provides a heating system, comprising a coal-fired generator set and a heating pipe network connected to the coal-fired generator set, the heating system further comprising: a waste incineration unit coupled to the coal-fired generator set; The waste incineration unit and the coal-fired power generation unit are both connected to the heating first station of the heating network; The waste incineration unit comprises: a waste incinerator and a waste heat boiler, wherein the waste incinerator is used to incinerate urban waste to generate high-temperature flue gas, and the waste heat boiler utilizes the high-temperature flue gas generated by the waste incinerator to heat water in the waste heat boiler to generate high-temperature steam; The coal-fired power generation unit comprises: a coal-fired boiler, the coal-fired boiler is used to generate high-temperature steam; When the coal-fired power generation unit is in normal operation, the heating first station of the heating network receives high-temperature steam generated by the coal-fired power generation unit and transmits the high-temperature steam to the heat users for heating; When the coal-fired power generation unit is in a low-load operation state, the heating first station of the heating pipeline network receives the high-temperature steam generated by the waste incineration unit and transmits the high-temperature steam to the heat users for heating.

[0006] In an embodiment of the present invention, the waste incineration unit further comprises: a waste storage and a waste transportation mechanism; One end of the garbage transport mechanism is connected to the garbage storage, and the other end of the garbage transport mechanism is connected to the garbage incinerator. The garbage transport mechanism is used to transport the urban garbage stored in the garbage storage to the garbage incinerator.

[0007] In the embodiment of the present invention, the waste incinerator is a reciprocating push-type furnace, and the grate of the reciprocating push-type furnace includes a drying section, a combustion section and a burnout section.

[0008] In an embodiment of the present invention, the waste heat boiler comprises: a flue, a drum, an economizer, a superheater, a water-cooled wall and a convection evaporator; The flue is used to receive high-temperature flue gas generated by the waste incinerator; The economizer is arranged in the flue and is used to preheat the feed water by using the high-temperature flue gas generated by the waste incinerator; the feed water heated by the economizer enters the boiler drum and mixes with the saturated water in the boiler drum; The convection evaporator is used to evaporate the mixed feed water to obtain a steam-water mixture; The boiler drum is used to separate the steam-water mixture into high-temperature water and high-temperature steam; The superheater is used to heat the high-temperature steam separated from the drum, and then the superheated steam is obtained to supply heat to the heat user; The water-cooled wall is used to absorb heat in the high-temperature flue gas through the circulation of water.

[0009] In the embodiment of the present invention, the waste heat boiler has one boiler drum, the waste heat boiler realizes natural circulation through one boiler drum, and the downcomers of the boiler drum are concentrated together.

[0010] In an embodiment of the present invention, the flue includes a first vertical flue, a second vertical flue, a third vertical flue and a rear horizontal flue, and the first vertical flue, the second vertical flue, the third vertical flue and the rear horizontal flue are all suspended in the waste incinerator.

[0011] In an embodiment of the present invention, the waste incineration unit further comprises: a steam-water module; The steam-water module comprises: a steam drum and connecting pipes; The connecting pipeline includes: a water supply mother pipe, which is divided into four routes. The output end of the first water supply mother pipe is connected to the inlet header of the first-stage economizer of the waste heat boiler, the output end of the second water supply mother pipe is connected to the outlet header of the third-stage economizer of the waste heat boiler, the output end of the third water supply mother pipe is connected to the first-stage water spray desuperheater of the waste heat boiler, and the output end of the third water supply mother pipe is connected to the second-stage water spray desuperheater of the waste heat boiler.

[0012] In an embodiment of the present invention, an economizer recirculation pipe is provided between the steam drum of the steam-water module and the inlet of the economizer of the waste heat boiler to protect the economizer when igniting a fire.

[0013] In an embodiment of the present invention, a check valve and a drain valve are provided in the thermal pipeline of the heating network.

[0014] A second aspect of the present invention is to provide a heating method, which is implemented based on the heating system as described above, and comprises: Burning municipal waste in waste incinerators to generate high-temperature steam; Burning raw coal to generate high-temperature steam through coal-fired power generation units; When the coal-fired power generation unit is in normal operation, the high-temperature steam generated by the coal-fired power generation unit is received through the heating first station of the heating pipe network, and the high-temperature steam is transported to the heat users for heating; When the coal-fired power generation unit is in a low-load operation state, the high-temperature steam generated by the waste incineration unit is received by the heating first station of the heating pipeline network, and the high-temperature steam is transported to the heat users for heating.

[0015] The heating system includes a waste incineration unit, a coal-fired power generation unit and a heating pipeline network. The heating system incinerates urban waste through the waste incineration unit to generate high-temperature steam, and burns raw coal through the coal-fired power generation unit to generate high-temperature steam. The high-temperature steam generated by the waste incineration unit or the high-temperature steam generated by the coal-fired power generation unit is used to provide heat for heat users, thereby solving the harm to the environment caused by a large amount of urban garbage dumps and realizing energy recovery and utilization.

[0016] Other features and advantages of the technical solution of the present invention will be described in detail in the specific implementation section below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a structural block diagram of a heating system provided by an embodiment of the present invention; Figure 2It is a flow chart of a heating method provided in an embodiment of the present invention.

[0018] Description of Reference Numerals 1-garbage storage, 2-garbage transportation mechanism, 3-garbage incinerator, 4-waste heat boiler, 5-steam-water module, 6-safety valve, 7-thermal heating pipeline, 8-check valve, 9-heating first station, 10-coal-fired boiler, 11-boiler drum, 12-superheater. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and advantages of the embodiments of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the process of realizing the present invention, the inventors found that the amount of urban domestic garbage increased sharply. A large amount of urban garbage would produce chemical reactions, release toxic gases, cause air pollution, and produce smog weather. In addition, the garbage contains many harmful bacteria, which are easy to breed infectious viruses and affect the health of residents. Therefore, the treatment of urban garbage has become a problem that needs to be solved urgently in today's society.

[0024] At present, underground burial for urban waste treatment has major drawbacks. Pollutants such as heavy metals produced when bacteria in urban waste decay and dissolve and seep into the ground will also cause soil and groundwater pollution. Another method is to build a new garbage power plant to incinerate garbage. However, there are many contradictions and conflicts with local residents in the site selection and land planning of the new garbage power plant. In addition, the new garbage power plant needs to invest in the construction of steam turbines, generators, exciters, main transformers, heating pipe network systems, auxiliary water production systems, and compressed air systems in addition to the garbage incineration boilers, and the subsequent investment costs are high.

[0025] In view of the above problems, a heating system is provided in an embodiment of the present invention, comprising: a coal-fired power generation unit and a heating pipe network connected to the coal-fired power generation unit, the heating system further comprising a waste incineration unit coupled to the coal-fired power generation unit; the waste incineration unit and the coal-fired power generation unit are both connected to a heating first station 9 of the heating pipe network; the waste incineration unit comprises: a waste incinerator 3 and a waste heat boiler 4, the waste incinerator 3 is used to incinerate urban waste to generate high-temperature flue gas, the waste heat boiler 4 utilizes the high temperature flue gas generated by the waste incinerator 3 to generate high temperature flue gas, and the waste heat boiler 4 utilizes the high temperature flue gas generated by the waste incinerator 3 to generate high temperature flue gas. The hot flue gas heats the water in the waste heat boiler 4 to generate high-temperature steam; the coal-fired generator set includes: a coal-fired boiler 10, which is used to generate high-temperature steam; when the coal-fired generator set is in normal operation, the heating first station 9 of the heating network receives the high-temperature steam generated by the waste incineration unit, and delivers the high-temperature steam to the heat user for heating; when the coal-fired generator set is in low-load operation, the heating first station 9 of the heating network receives the high-temperature steam generated by the waste incineration unit, and delivers the high-temperature steam to the heat user for heating. The heating system includes a waste incineration unit, a coal-fired generator set and a heating network. The heating system incinerates urban waste to generate high-temperature steam through the waste incineration unit, burns raw coal to generate high-temperature steam through the coal-fired generator set, and uses the high-temperature steam generated by the waste incineration unit or the high-temperature steam generated by the coal-fired generator set to provide heat for heat users, thereby solving the environmental hazards of a large number of urban garbage dumps and realizing energy recycling.

[0026] Example 1 Figure 1 is a structural block diagram of a heating system provided by an embodiment of the present invention. Figure 1As shown, this embodiment provides a heating system, including a coal-fired power generation unit and a heating pipe network connected to the coal-fired power generation unit, and also includes: a waste incineration unit coupled to the coal-fired power generation unit; The waste incineration unit and the coal-fired power generation unit are both connected to the heating first station 9 of the heating network; The waste incineration unit comprises: a waste incinerator 3 and a waste heat boiler 4, wherein the waste incinerator 3 is used to incinerate urban waste to generate high-temperature flue gas, and the waste heat boiler 4 uses the high-temperature flue gas generated by the waste incinerator 3 to heat water in the waste heat boiler 4 to generate high-temperature steam; The coal-fired power generation unit comprises: a coal-fired boiler 10, wherein the coal-fired boiler 10 is used to generate high-temperature steam; When the coal-fired power generation unit is in normal operation, the heat supply first station 9 of the heat supply network receives high-temperature steam generated by the coal-fired power generation unit and delivers the high-temperature steam to heat users for heating; When the coal-fired power generation unit is in a low-load operation state, the heating first station 9 of the heating network receives the high-temperature steam generated by the waste incineration unit and transmits the high-temperature steam to the heat users for heating.

[0027] In this embodiment, the high-temperature steam generated by the waste incineration unit or the high-temperature steam generated by the coal-fired power generation unit matches the steam parameters in the heating first station 9.

[0028] In this embodiment, the waste incineration unit further includes: a waste storage 1 and a waste transportation mechanism 2; One end of the garbage transport mechanism 2 is connected to the garbage storage 1 , and the other end of the garbage transport mechanism 2 is connected to the garbage incinerator 3 . The garbage transport mechanism 2 is used to transport the urban garbage stored in the garbage storage 1 to the garbage incinerator 3 .

[0029] The garbage storage capacity of the garbage storage 1 is determined by the coal consumption of the coal-fired power generation unit; The garbage depot 1 is a fully enclosed warehouse, with a chimney on the ceiling and a sprinkler head inside. The garbage depot 1 is sealed and needs to be equipped with a deodorization system to prevent the garbage depot 1 from causing air pollution that threatens the health of power plant employees and nearby residents. At the same time, the garbage depot 1 needs to be equipped with online monitoring points such as oxygen content, methane, and air temperature to prevent the garbage depot 1 from exploding. The garbage in the garbage depot 1 is transported to the garbage incinerator 3 through a garbage conveyor belt.

[0030] In this embodiment, the garbage storage capacity of the garbage depot 1 is determined by the coal consumption of the coal-fired power generation unit. Specifically, the maximum garbage storage capacity of the garbage depot 1 is 7 times the daily garbage received by the coupled large-scale coal-fired power plant. The maximum continuous garbage processing capacity of the garbage incinerator 3 is initially designed to be about 500t / d. The actual maximum continuous garbage processing capacity is determined according to the needs of the city where the coal-fired power generation unit is located to coordinate the daily urban garbage processing capacity.

[0031] Furthermore, the design value of the low calorific value of the garbage entering the waste incinerator 3 is 6800 kJ / kg, and the variation range of the low calorific value of the garbage entering the furnace is 4200-8900 kJ / kg.

[0032] In this embodiment, the waste incinerator 3 is a reciprocating push-type grate, and the grate of the reciprocating push-type grate includes a drying section, a combustion section, and a burnout section. Specifically, in this embodiment, the cumulative operating time of the waste incinerator 3 is about 8000 hours, and each grate is provided with a separate hydraulic drive device, and the movement speed is determined according to the combustion situation and the heating demand of the heat user.

[0033] In this embodiment, the waste heat boiler 4 includes: a flue, a drum 11, an economizer, a superheater 12, a water-cooled wall and a convection evaporator; The flue is used to receive high-temperature flue gas generated when the waste incinerator 3 burns urban waste; The economizer is arranged in the flue, and is used to preheat the feed water by using the high-temperature flue gas generated by the waste incinerator 3; the temperature of the feed water is increased, and the feed water heated by the economizer enters the boiler drum 11 and mixes with the saturated water in the boiler drum 11; The convection evaporator is used to evaporate the mixed feed water to obtain a steam-water mixture; The boiler drum 11 is used to separate the steam-water mixture into high-temperature water and high-temperature steam; The superheater 12 is used to further heat the high-temperature steam separated from the drum 11, and to supply heat to heat users after obtaining superheated steam; The water-cooled wall is used to absorb the heat in the high-temperature flue gas through the circulation of water to prevent the waste heat boiler 4 from overheating.

[0034] Specifically, in this embodiment, the waste heat boiler 4 system is preliminarily designed with a rated evaporation capacity of 47.1t / h, a rated steam pressure of 2MPa, and a temperature of 300°C. The actual rated evaporation capacity is designed according to the maximum continuous waste treatment capacity of the incinerator in claim 4, and the rated steam pressure and temperature are designed according to the steam parameters of the first heating station 9 of the large coal-fired power plant coupled thereto, and the rated steam pressure and temperature are equal to the steam pressure and temperature of the first heating station 9. The cylinder length of the drum 11 is 11000mm, the inner diameter of the drum 11 is 1600mm, and the inner wall thickness of the drum 11 is 60mm. A safety valve 6 is provided on the outlet steam pipe of the superheater 12.

[0035] In this embodiment, the number of the boiler drum 11 is one, the waste heat boiler 4 uses one boiler drum 11 to achieve natural circulation, and the downcomers of the boiler drum 11 are concentrated together.

[0036] In this embodiment, the flue includes a first vertical flue, a second vertical flue, a third vertical flue and a rear horizontal flue, and the first vertical flue, the second vertical flue, the third vertical flue and the rear horizontal flue are all suspended in the waste incinerator 3.

[0037] In this embodiment, the waste incineration unit further comprises: a steam-water module 5; The steam-water module 5 comprises: a steam drum and connecting pipes; The connecting pipe is used to connect the drum 11, economizer, superheater 12, water-cooled wall and convection evaporator in the waste heat boiler 4; The connecting pipeline includes: a water supply mother pipe, which is divided into four routes. The output end of the first water supply mother pipe is connected to the inlet header of the first-stage economizer of the waste heat boiler 4, the output end of the second water supply mother pipe is connected to the outlet header of the third-stage economizer of the waste heat boiler 4, the output end of the third water supply mother pipe is connected to the first-stage water spray desuperheater of the waste heat boiler 4, and the output end of the third water supply mother pipe is connected to the second-stage water spray desuperheater of the waste heat boiler 4.

[0038] In this embodiment, an economizer recirculation pipe is provided between the steam drum of the steam-water module 5 and the inlet of the economizer of the waste heat boiler 4, for protecting the economizer when igniting a fire. Specifically, the economizer recirculation pipe can lead boiler water from the boiler to the economizer inlet header when a sufficient amount of continuous feed water is not established to flow into the drum 11 during the startup phase, so as to prevent the water in the economizer tube from stagnating and vaporizing.

[0039] In this embodiment, a check valve 8 and a steam trap are provided in the thermal pipeline of the heating network. Furthermore, a check valve 8 and a steam trap are also provided in the thermal pipeline between the extraction steam from the coal-fired power plant to the heating first station 9.

[0040] In this embodiment, the compressed air and ignition micro-oil required by the waste incineration unit can utilize the existing equipment in the coal-fired power generation unit to reduce costs. Specifically, the waste incineration unit is provided with a micro-oil auxiliary combustion module, and the micro-oil auxiliary combustion module and the oil depot utilize the oil depot of the coal-fired power generation unit. A micro-oil pipeline is laid from the existing micro-oil depot to the front of the waste incinerator 3, and an oil gun is installed as a standby for ignition of the waste incinerator 3.

[0041] Figure 2 : is a flow chart of a heating method provided by an embodiment of the present invention. Figure 2 As shown, this embodiment provides a heating method, comprising: Burning municipal waste in waste incineration units to generate high-temperature steam for supplying heat to heat users; Burning raw coal through coal-fired power generation units to generate high-temperature steam for supplying heat to heat users; The heating first station 9 of the heating pipe network receives high-temperature steam generated by the waste incineration unit or the coal-fired power generation unit, and transmits the high-temperature steam to the heat users for heating; Specific: When the coal-fired power generation unit is in normal operation, the heat supply first station 9 of the heat supply network receives high-temperature steam generated by the coal-fired power generation unit and delivers the high-temperature steam to the heat user for heating; When the coal-fired unit is in a low-load operation state, the high-temperature steam generated by the waste incineration unit is received through the heating first station 9 of the heating pipe network, and the high-temperature steam is transported to the heat users for heating.

[0042] Embodiment 2: This embodiment provides a heating system, which is arranged near an existing coal-fired power generation unit. Urban garbage is sent to a garbage storage 1 for storage, and is sent out through a garbage transport mechanism 2 after processing; the burnt garbage sent by the garbage transport mechanism 2 is sent to a waste heat boiler 4 and burned in a garbage incinerator 3; the heat generated by burning the garbage heats a steam-water module 5; steam and water are separated through a boiler drum 11; the steam generated by the boiler drum 11 enters the heating surface of the first to fourth stage superheater 12 for further heating; a safety valve 6 is installed on the top of the furnace and connected to the steam pipeline, and when the steam pressure is greater than the action value of the safety valve 6, the safety valve 6 will operate to exhaust steam; the steam exchanged again by the superheater 12 enters the thermal heating pipeline 7, flows through the steam check valve 8 and enters the heating first station 9, and finally provides hot steam for heat users.

[0043] Example 3 A further design of this example is that it effectively utilizes the flue gas purification system and the public system of the coal-fired power generation unit to save investment.

[0044] The waste incineration unit is equipped with a 500t / d waste incinerator with three rows of furnaces, which is designed to process 1,000t of urban domestic waste per day and 365,000 tons of domestic waste per year. However, the combustion of urban waste will produce a large amount of harmful gases, causing serious pollution to the environment. The flue gas at the tail of the waste incinerator 3 designed by the patent of the present invention passes through the flue and directly enters the desulfurization device of the coal-fired power generation unit coupled with it, and then enters the dust collector and desulfurization device in turn to reduce NO in the flue gas. x , dust and SO2 concentration, reaching environmental emission standards. At the same time, the patent of this invention utilizes existing public systems, such as: ignition and stable combustion micro-oil system, compressed air system, heating pipeline system, etc., which greatly saves investment.

[0045] Example 4 The further design of this example is to perfectly realize the thermal and electrical decoupling of the coal-fired heating power station.

[0046] As we all know, due to the fluctuation of coal prices in the coal market, especially in provinces and cities with low electricity prices, the pure power generation profit of coal-fired power plants is very low, or even loss-making, and heating is the key to profitability of most coal-fired power plants. However, with the addition of new energy, coal-fired power generation units have basically participated in the process of deep peak regulation, and many units operate at low loads below 50% all year round. During the low-load operation of coal-fired power generation units, if the coal-fired power generation units also use steam extraction for heating, it will also be a huge challenge to the safe and stable operation of the coal-fired power generation units.

[0047] The patent of the present invention redesigns and constructs a set of waste incineration boilers outside the original coal-fired power generation unit. The steam generated directly enters the heating pipe network system of the coal-fired unit. When the coal-fired unit is running at low load, the steam generated by the waste incinerator 3 can be directly used to enter the heat user, avoiding the low-load operation of the coal-fired unit to extract steam for heating, and perfectly realizing the thermal and electrical decoupling of the coal-fired power plant.

[0048] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0050] The optional implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings. However, the implementation modes of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the implementation modes of the present invention, a variety of simple modifications can be made to the technical solutions of the implementation modes of the present invention, and these simple modifications all belong to the protection scope of the implementation modes of the present invention. It should also be noted that the various specific technical features described in the above specific implementation modes can be combined in any suitable manner without contradiction, and as long as the combination does not violate the concept of the implementation modes of the present invention, it should also be regarded as the content disclosed in the implementation modes of the present invention.

Claims

1. A heating system, comprising a coal-fired generator set and a heating pipe network connected to the coal-fired generator set, characterized in that: It also includes: a garbage incineration unit coupled to the coal-fired power generation unit; The waste incineration unit and the coal-fired power generation unit are both connected to the heating first station of the heating network; The waste incineration unit comprises: a waste incinerator and a waste heat boiler, wherein the waste incinerator is used to incinerate urban waste to generate high-temperature flue gas, and the waste heat boiler utilizes the high-temperature flue gas generated by the waste incinerator to heat water in the waste heat boiler to generate high-temperature steam; The coal-fired power generation unit comprises: a coal-fired boiler, the coal-fired boiler is used to generate high-temperature steam; When the coal-fired power generation unit is in normal operation, the heating first station of the heating network receives high-temperature steam generated by the coal-fired power generation unit and transmits the high-temperature steam to the heat users for heating; When the coal-fired power generation unit is in a low-load operation state, the heating first station of the heating pipeline network receives the high-temperature steam generated by the waste incineration unit and transmits the high-temperature steam to the heat users for heating.

2. The heating system according to claim 1, characterized in that: The waste incineration unit also includes: a waste storage and a waste transportation mechanism; One end of the garbage transport mechanism is connected to the garbage storage, and the other end of the garbage transport mechanism is connected to the garbage incinerator. The garbage transport mechanism is used to transport the urban garbage stored in the garbage storage to the garbage incinerator.

3. The heating system according to claim 1, characterized in that: The waste incinerator is a reciprocating push-type furnace, and the grate of the reciprocating push-type furnace includes a drying section, a combustion section and a burnout section.

4. The heating system according to claim 1, characterized in that: The waste heat boiler comprises: a flue, a boiler drum, an economizer, a superheater, a water-cooled wall and a convection evaporator; The flue is used to receive high-temperature flue gas generated by the waste incinerator; The economizer is arranged in the flue and is used to preheat the feed water by using the high-temperature flue gas generated by the waste incinerator; the feed water heated by the economizer enters the boiler drum and mixes with the saturated water in the boiler drum; The convection evaporator is used to evaporate the mixed feed water to obtain a steam-water mixture; The boiler drum is used to separate the steam-water mixture into high-temperature water and high-temperature steam; The superheater is used to heat the high-temperature steam separated from the drum, and then the superheated steam is obtained to supply heat to the heat user; The water-cooled wall is used to absorb heat in the high-temperature flue gas through the circulation of water.

5. The heating system according to claim 4, characterized in that: The waste heat boiler has one boiler drum, and the waste heat boiler realizes natural circulation through one boiler drum, and the downcomers of the boiler drum are concentrated together.

6. The heating system according to claim 4, characterized in that: The flue comprises a first vertical flue, a second vertical flue, a third vertical flue and a rear horizontal flue, and the first vertical flue, the second vertical flue, the third vertical flue and the rear horizontal flue are all suspended in the waste incinerator.

7. The heating system according to claim 4, characterized in that: The waste incineration unit further comprises: a soda module; The steam-water module comprises: a steam drum and connecting pipes; The connecting pipeline includes: a water supply mother pipe, which is divided into four routes. The output end of the first water supply mother pipe is connected to the inlet header of the first-stage economizer of the waste heat boiler, the output end of the second water supply mother pipe is connected to the outlet header of the third-stage economizer of the waste heat boiler, the output end of the third water supply mother pipe is connected to the first-stage water spray desuperheater of the waste heat boiler, and the output end of the third water supply mother pipe is connected to the second-stage water spray desuperheater of the waste heat boiler.

8. The heating system according to claim 7, characterized in that: An economizer recirculation pipe is provided between the steam drum of the steam-water module and the inlet of the economizer of the waste heat boiler, so as to protect the economizer when igniting a fire.

9. The heating system according to claim 1, characterized in that: A check valve and a drain valve are arranged in the thermal pipeline of the heating network.

10. A heating method, based on the heating system according to claim 1, characterized in that: The method comprises: Burning municipal waste in waste incinerators to generate high-temperature steam; Burning raw coal to generate high-temperature steam through coal-fired power generation units; When the coal-fired power generation unit is in normal operation, the high-temperature steam generated by the coal-fired power generation unit is received through the heating first station of the heating pipe network, and the high-temperature steam is transported to the heat users for heating; When the coal-fired power generation unit is in a low-load operation state, the high-temperature steam generated by the waste incineration unit is received by the heating first station of the heating pipeline network, and the high-temperature steam is transported to the heat users for heating.

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