Solar reheating coupling waste incineration power generation system and method

Abstract

The invention discloses a solar reheating and waste incineration coupled power generation system and method.The system comprises a waste incineration power generation unit, a solar steam reheating unit and a solar primary air preheating unit, and the waste incineration power generation unit is connected with the solar steam reheating unit and the solar primary air preheating unit; and the solar steam reheating unit is connected with the solar primary air preheating unit. Exhaust steam of the high-pressure cylinder of the steam turbine is heated, the average heat absorption temperature of the steam and the power cycle efficiency of the steam are improved, the output work of the steam turbine is increased, the steam humidity of a low-pressure cylinder section is reduced, erosion of wet steam to blades of the low-pressure cylinder is reduced, and safe and stable operation of the low-pressure cylinder is facilitated; solar energy and waste incineration power generation are coupled, the average quality of steam can be improved, loss in the steam expansion process is reduced, environmental protection is achieved, and the operation cost is saved; the oil-steam heat exchanger is arranged outside the furnace, steam exhausted by the high-pressure cylinder exchanges heat with heat conduction oil outside the furnace, and corrosion of flue gas in the furnace to the reheater is effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of garbage disposal, and in particular relates to a solar energy reheating coupled garbage incineration power generation system and method. Background Art

[0002] With the rapid growth of population and economy, the output of domestic waste is increasing. The waste incineration power generation technology has been widely promoted and applied due to its advantages of reduction, harmlessness and resource utilization. Before the waste is incinerated, the waste is piled in the garbage bin to extract most of the leachate, and then sent to the incinerator for drying and incineration, and the generated heat energy is converted into electricity.

[0003] However, waste fuel has the characteristics of complex composition and high water content, and waste incineration power generation technology urgently needs to be improved and innovated to improve the efficiency of waste incineration power generation. Nowadays, new energy technologies such as solar energy are becoming more and more mature and are more widely used in the power industry. How to combine solar energy, a new energy source, with waste incineration power generation to further improve the energy utilization efficiency of waste incineration power generation has become one of the concerns of the industry. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a solar energy reheat coupled waste incineration power generation system and method.

[0005] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0006] A solar reheat coupled waste incineration power generation system comprises a waste incineration power generation unit, a solar steam reheat unit and a solar primary air preheating unit, wherein the waste incineration power generation unit is connected to the solar steam reheat unit and the solar primary air preheating unit respectively, and the solar steam reheat unit is connected to the solar primary air preheating unit, the solar steam reheat unit is used to reheat the exhaust steam of the waste incineration power generation unit and to store and release the heat, the solar primary air preheating unit is used to transport the preheated air to the waste incineration power generation unit, and the waste incineration power generation unit is used to achieve waste incineration and power generation.

[0007] Furthermore, the waste incineration power generation unit includes a waste incineration boiler, a steam turbine, a condenser, a low-pressure heater, a deaerator and a feed water pump. The steam turbine is respectively connected to the waste incineration boiler, the condenser, the low-pressure heater and the deaerator. The condenser is connected to the low-pressure heater. The low-pressure heater is connected to the deaerator and then connected to the feed water pump and the waste incineration boiler in sequence.

[0008] Furthermore, the low-pressure heater includes a No. 1 low-pressure heater and a No. 2 low-pressure heater, the No. 1 low-pressure heater is connected to the steam turbine, the condenser and the No. 2 low-pressure heater, and the No. 2 low-pressure heater is connected to the steam turbine and the deaerator.

[0009] Furthermore, the solar steam reheat unit includes a solar collector, an oil-steam heat exchanger, a molten salt heat storage tank and an oil-molten salt heat exchanger. The solar collector is connected to the oil-steam heat exchanger and the oil-molten salt heat exchanger respectively, and the molten salt heat storage tank is connected to the oil-molten salt heat exchanger. The exhaust steam of the waste incineration power generation unit is reheated through the oil-steam heat exchanger, and the heat is stored and released through the molten salt heat storage tank.

[0010] Furthermore, the molten salt heat storage tank includes a hot tank and a cold tank, and the hot tank and the cold tank are respectively connected to the oil-molten salt heat exchanger.

[0011] Furthermore, the oil-molten salt heat exchanger includes a No. 1 oil-molten salt heat exchanger and a No. 2 oil-molten salt heat exchanger, and the No. 1 oil-molten salt heat exchanger and the No. 2 oil-molten salt heat exchanger are both connected to a hot tank and a cold tank. The low-temperature molten salt flows out of the cold tank, passes through the No. 1 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil therein. After absorbing the heat, the low-temperature molten salt flows into the hot tank for storage. When the heat needs to be released, the high-temperature molten salt in the hot tank flows through the No. 2 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger. The heat transfer oil after the heat exchange flows through the oil-steam heat exchanger and the solar primary air preheating unit in turn, reheats the exhaust steam of the waste incineration power generation unit through the oil-steam heat exchanger, and heats the cold air through the solar primary air preheating unit.

[0012] Furthermore, the solar primary air preheating unit includes an air preheater, an air blower and a primary air distributor. The air preheater is connected to the solar steam reheating unit, the air blower and the primary air distributor. The primary air distributor is used to send the heated primary air into the waste incineration boiler.

[0013] Furthermore, the inlet pipe of the air preheater is connected to the oil-steam heat exchanger of the solar steam reheat unit, the outlet pipe of the air preheater is connected to the No. 2 oil-molten salt heat exchanger of the solar steam reheat unit through control valve 1, and the outlet pipe of the air preheater is connected to the solar collector and No. 1 oil-molten salt heat exchanger of the solar steam reheat unit through control valve 2.

[0014] The present invention also discloses a solar energy reheating coupled waste incineration power generation method, which uses the solar energy reheating coupled waste incineration power generation system as described above to perform waste incineration power generation, and the method comprises the following steps:

[0015] In the waste incineration power generation unit, feed water is sent to the waste incineration boiler through a feed water pump for heating, generating superheated steam and being sent to the steam turbine. The steam performs work in the high-pressure cylinder of the steam turbine, and then is sent to the oil-steam heat exchanger and exchanges heat with the heat transfer oil in the oil-steam heat exchanger. The steam is then sent to the low-pressure cylinder of the steam turbine to continue to expand and perform work, and then is sent to the condenser to be condensed into liquid. The condensed water passes through the No. 1 low-pressure heater, the No. 2 low-pressure heater and the deaerator in turn to reach the feed water temperature again, and is sent to the waste incineration boiler by the feed water pump to continue circulation;

[0016] In the solar steam reheating unit, the heat transfer oil is heated by the solar collector and transported to the oil-steam heat exchanger and the oil-molten salt heat exchanger respectively. The oil-steam heat exchanger will reheat the high-pressure cylinder exhaust steam, and the No. 1 oil-molten salt heat exchanger will heat the molten salt in the molten salt heat storage tank and store the heat through the hot tank; when the heat needs to be released, the high-temperature molten salt in the hot tank flows through the No. 2 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger. The heat transfer oil after heat exchange flows through the oil-steam heat exchanger and the air preheater in turn, reheats the high-pressure cylinder exhaust steam through the oil-steam heat exchanger, and heats the cold air through the air preheater;

[0017] In the solar primary air preheating unit, the blower sends cold air into the air preheater for heating, then into the primary air distributor, and then into the waste incineration boiler to dry and burn the waste.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention can heat the exhaust steam from the high-pressure cylinder of the steam turbine, thereby increasing the average heat absorption temperature of the steam. On the one hand, it improves the steam power cycle efficiency, increases the output power of the steam turbine, and effectively improves the cycle power generation efficiency; on the other hand, it reduces the steam humidity in the low-pressure cylinder section, reduces the erosion of the low-pressure cylinder blades by wet steam, reduces the steam extraction loss, and is beneficial to the safe and stable operation of the low-pressure cylinder.

[0020] The present invention arranges a molten salt heat storage tank in the solar steam reheating unit to store heat during periods of abundant sunshine and release it during periods of lack of sunshine such as night, thereby achieving all-weather heating of high-pressure cylinder exhaust steam and primary air, improving the stability of system operation, and enhancing the energy utilization rate and economy of waste incineration power generation. At the same time, solar energy is coupled with waste incineration power generation, which can fully utilize solar radiation energy, improve the average quality of steam, reduce losses in the steam expansion process, and is more environmentally friendly and saves operating costs.

[0021] The present invention utilizes the waste heat of solar energy reheating to heat the primary air, replacing the steam extraction of the steam turbine, thereby reducing the steam extraction amount, allowing more steam to expand and do work in the steam turbine, and improving the power generation capacity of the system.

[0022] The present invention arranges the oil-steam heat exchanger outside the furnace, and the high-pressure cylinder exhaust steam exchanges heat with the heat-conducting oil outside the furnace, effectively avoiding the corrosion of the reheater by the flue gas in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0026] like Figure 1 As shown, a solar reheat coupled waste incineration power generation system includes a waste incineration power generation unit, a solar steam reheat unit and a solar primary air preheating unit, wherein the waste incineration power generation unit is connected to the solar steam reheat unit and the solar primary air preheating unit respectively, and the solar steam reheat unit is connected to the solar primary air preheating unit, and the exhaust steam of the waste incineration power generation unit is reheated and heat is stored and released through the solar steam reheat unit, and preheated air is transported to the waste incineration power generation unit through the solar primary air preheating unit, and waste incineration and power generation are achieved through the waste incineration power generation unit.

[0027] In some embodiments, the waste incineration power generation unit includes a waste incineration boiler 1, a steam turbine, a condenser 3, a low-pressure heater, a deaerator 5 and a feed water pump 6, wherein the waste incineration boiler 1 is connected to the high-pressure cylinder 21 of the steam turbine through a pipeline, the low-pressure cylinder 22 of the steam turbine is connected to the condenser 3 through a pipeline, the low-pressure heater includes a No. 1 low-pressure heater 41 and a No. 2 low-pressure heater 42 that are connected, the No. 1 low-pressure heater 41 is connected to the low-pressure cylinder 22, the condenser 3 and the No. 2 low-pressure heater 42, the No. 2 low-pressure heater 42 is connected to the low-pressure cylinder 22 and the deaerator 5, the deaerator 5 is connected to the feed water pump 6 through a pipeline, and the feed water pump 6 is connected to the waste incineration boiler 1 through a pipeline.

[0028] In some embodiments, the solar steam reheat unit includes a solar collector 7, an oil-steam heat exchanger 8, a molten salt heat storage tank and an oil-molten salt heat exchanger, wherein the solar collector 7 is connected to the oil-steam heat exchanger 8 and the oil-molten salt heat exchanger, respectively, the molten salt heat storage tank is connected to the oil-molten salt heat exchanger, the high-pressure cylinder exhaust steam is reheated through the oil-steam heat exchanger 8, and the heat is stored and released through the molten salt heat storage tank.

[0029] In some more specific embodiments, the molten salt heat storage tank includes a hot tank 91 and a cold tank 92, and the hot tank 91 and the cold tank 92 are respectively connected to the oil-molten salt heat exchanger.

[0030] In some more specific embodiments, the oil-molten salt heat exchanger includes a No. 1 oil-molten salt heat exchanger 101 and a No. 2 oil-molten salt heat exchanger 102. The No. 1 oil-molten salt heat exchanger 101 and the No. 2 oil-molten salt heat exchanger 102 are both connected to the hot tank 91 and the cold tank 92. The low-temperature molten salt flows out of the cold tank 92, passes through the No. 1 oil-molten salt heat exchanger 101 and exchanges heat with the heat transfer oil therein. After absorbing the heat, the low-temperature molten salt flows into the hot tank 91 for storage. When the heat needs to be released, the high-temperature molten salt in the hot tank 91 flows through the No. 2 oil-molten salt heat exchanger 102 and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger 102. The heat transfer oil after heat exchange flows through the oil-steam heat exchanger 8 and the solar primary air preheating unit in turn, reheats the exhaust steam of the waste incineration power generation unit through the oil-steam heat exchanger 8, and heats the cold air through the solar primary air preheating unit.

[0031] In some embodiments, the solar primary air preheating unit includes an air preheater 20, an air blower 30 and a primary air distributor 40. The air preheater 20 is connected to the solar steam reheating unit, the air blower 30 and the primary air distributor 40. The primary air distributor 40 is used to send the heated primary air into the waste incineration boiler 1.

[0032] In some more specific embodiments, the inlet pipe of the air preheater 20 is connected to the oil-steam heat exchanger 8 of the solar steam reheat unit, the outlet pipe of the air preheater 20 is connected to the No. 2 oil-molten salt heat exchanger 102 of the solar steam reheat unit through a control valve 1 50, and the outlet pipe of the air preheater 20 is connected to the solar collector 7 and the No. 1 oil-molten salt heat exchanger 101 of the solar steam reheat unit through a control valve 2 60.

[0033] The present invention also discloses a solar energy reheating coupled waste incineration power generation method, comprising the following steps:

[0034] In the waste incineration power generation unit, the feed water is sent to the waste incineration boiler 1 through the feed water pump 6 for heating, and superheated steam is generated and sent to the steam turbine. The steam performs work in the high-pressure cylinder 21 of the steam turbine, and then is sent to the oil-steam heat exchanger 8 and exchanges heat with the heat transfer oil in the oil-steam heat exchanger 8. The steam is then sent to the low-pressure cylinder 22 of the steam turbine to continue to expand and perform work, and then sent to the condenser 3 to condense to liquid state. The condensed water passes through the No. 1 low-pressure heater 41, the No. 2 low-pressure heater 42 and the deaerator 5 in sequence, reaches the feed water temperature again, and is sent to the waste incineration boiler 1 by the feed water pump 6 to continue circulation;

[0035] In the solar steam reheating unit, the heat transfer oil is heated by the solar collector 7 and transported to the oil-steam heat exchanger 8 and the oil-molten salt heat exchanger respectively. The oil-steam heat exchanger 8 will reheat the high-pressure cylinder exhaust steam, and the No. 1 oil-molten salt heat exchanger 101 will heat the molten salt in the molten salt heat storage tank and store the heat through the hot tank 91; when the heat needs to be released, the high-temperature molten salt in the hot tank 91 flows through the No. 2 oil-molten salt heat exchanger 102, and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger 102. The heat transfer oil after heat exchange flows through the oil-steam heat exchanger 8 and the air preheater 20 in turn, reheats the high-pressure cylinder exhaust steam through the oil-steam heat exchanger 8, and heats the cold air or primary air through the air preheater 20;

[0036] In the solar primary air preheating unit, the blower 30 sends cold air into the air preheater 20 for heating, and then sends it into the primary air distributor 40, and then into the waste incineration boiler 1 to dry and burn the waste.

[0037] Example 1

[0038] like Figure 1 As shown, a solar reheat coupled waste incineration power generation system includes a waste incineration power generation unit, a solar steam reheat unit and a solar primary air preheating unit. The waste incineration power generation unit is connected to the solar steam reheat unit and the solar primary air preheating unit respectively, and the solar steam reheat unit is connected to the solar primary air preheating unit. The solar steam reheat unit is used to reheat the exhaust steam of the waste incineration power generation unit and to store and release heat. The solar primary air preheating unit is used to transport preheated air to the waste incineration power generation unit, and the waste incineration and power generation are achieved through the waste incineration power generation unit.

[0039] The waste incineration power generation unit includes a waste incineration boiler 1, a steam turbine, a condenser 3, a low-pressure heater, a deaerator 5 and a feed water pump 6. The low-pressure heater includes a No. 1 low-pressure heater 41 and a No. 2 low-pressure heater 42. The steam turbine is connected to the waste incineration boiler 1, the condenser 3 and the deaerator 5 respectively. The No. 1 low-pressure heater 41 is connected to the steam turbine, the condenser 3 and the No. 2 low-pressure heater 42. The No. 2 low-pressure heater 42 is connected to the steam turbine and the deaerator 5. The deaerator 5 is connected to the feed water pump 6 through a pipeline, and the feed water pump 6 is connected to the waste incineration boiler 1 through a pipeline.

[0040] The solar steam reheating unit includes a solar collector 7, an oil-steam heat exchanger 8, a molten salt heat storage tank and an oil-molten salt heat exchanger, the molten salt heat storage tank includes a hot tank 91 and a cold tank 92, the oil-molten salt heat exchanger includes a No. 1 oil-molten salt heat exchanger 101 and a No. 2 oil-molten salt heat exchanger 102, the No. 1 oil-molten salt heat exchanger 101 and the No. 2 oil-molten salt heat exchanger 102 are both connected to the hot tank 91 and the cold tank 92, the solar collector 7 is respectively connected to the oil-steam heat exchanger 8, the No. 1 oil-molten salt heat exchanger 101 and the No. 2 oil-molten salt heat exchanger 102, and the low-temperature molten salt is The heat flows out of the cold tank 92, passes through the No. 1 oil-molten salt heat exchanger 101 and exchanges heat with the heat transfer oil therein. The low-temperature molten salt absorbs the heat and flows into the hot tank 91 for storage. When the heat needs to be released, the high-temperature molten salt in the hot tank 91 flows through the No. 2 oil-molten salt heat exchanger 102, and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger 102. The heat transfer oil after heat exchange flows through the oil-steam heat exchanger 8 and the solar primary air preheating unit in turn, reheats the exhaust steam of the waste incineration power generation unit through the oil-steam heat exchanger 8, and heats the cold air through the solar primary air preheating unit.

[0041] The solar primary air preheating unit includes an air preheater 20, an air blower 30 and a primary air distributor 40. The inlet pipe of the air preheater 20 is connected to the oil-steam heat exchanger 8, and the outlet pipe of the air preheater 20 is connected to the No. 2 oil-molten salt heat exchanger 102 through a control valve 1 50. The outlet pipe of the air preheater 20 is connected to the solar collector 7 and the No. 1 oil-molten salt heat exchanger 101 through a control valve 2 60. The primary air distributor 40 is used to send the heated primary air into the waste incineration boiler 1.

[0042] A solar energy reheating coupled waste incineration power generation method comprises the following steps:

[0043] In the waste incineration power generation unit, the feed water is sent to the waste incineration boiler 1 through the feed water pump 6 for heating, and superheated steam of 440°C is generated and sent to the steam turbine. The steam works in the high-pressure cylinder 21 of the steam turbine, and the steam temperature drops to 260°C. Then, it is sent to the oil-steam heat exchanger 8 through a pipeline, and heat is exchanged with the heat transfer oil in the oil-steam heat exchanger 8. The steam temperature rises to 390°C, and then it is sent to the low-pressure cylinder 22 of the steam turbine to continue to expand and work. The steam works until the temperature at the end of the low-pressure cylinder drops to 43.12°C, and is sent to the condenser 3 to condense into liquid. The condensed water is heated by the No. 1 low-pressure heater 41, the No. 2 low-pressure heater 42 and the deaerator 5 in turn, and reaches the feed water temperature of 130°C again, and is sent to the waste incineration boiler 1 by the feed water pump 6 to continue circulation;

[0044] In the solar steam reheating unit, the heat transfer oil is heated to 395°C by the solar collector 7 and transported to the oil-steam heat exchanger 8, the No. 1 oil-molten salt heat exchanger 101 and the No. 2 oil-molten salt heat exchanger 102 respectively. The oil-steam heat exchanger 8 will reheat the high-pressure cylinder exhaust steam. The molten salt heat storage tank includes a hot tank 91 and a cold tank 92. The low-temperature molten salt flows out of the cold tank 92, absorbs heat from the heat transfer oil side through the No. 1 oil-molten salt heat exchanger 101, and finally flows into the hot tank 91 for storage. When there is insufficient sunshine, such as at night, the No. 1 oil-molten salt heat exchanger 101 will be closed, and the No. 2 oil-molten salt heat exchanger 102 will be opened to serve as a heat source for steam reheating and air preheating. Specifically, the molten salt heat storage tank will release the stored heat during the period of insufficient sunshine, such as at night, and the molten salt in the heat tank 91 will flow through the No. 2 oil-molten salt heat exchanger 102, transferring the heat in the molten salt to the heat transfer oil, part of which will be transported to the oil-steam heat exchanger 8 to reheat the steam, and the other part will be transported to the air preheater 20 to heat the cold air or primary air;

[0045] In the solar primary air preheating unit, the blower 30 sends cold air into the air preheater 20. After the heat transfer oil heats the air to 210°C, it is sent to the primary air distributor 40 at the bottom of the waste incineration boiler 1, and then sent to the waste incineration boiler 1 to dry and burn the waste.

[0046] In the solar steam reheating unit of this embodiment, heat transfer oil is circulated, and the heat transfer oil is Therminol VP-1. The heat transfer oil will continuously absorb and release heat.

[0047] The solar collector 7 in this embodiment is a parabolic trough collector, including a parabolic mirror, a heat absorbing single tube and a mirror control drive. The parabolic mirror focuses sunlight onto the heat absorbing single tube. The mirror control drive ensures that the mirror receives as much sunlight as possible. The heat transfer oil flows through the heat absorbing single tube and is heated to 395°C.

[0048] According to the above implementation, there may be one or more waste incineration power generation units. When there are multiple waste incineration power generation units, the number of oil-steam heat exchangers should correspond to them, and the number of solar collectors 7 should also be increased accordingly. Those skilled in the art can set multiple solar collectors 7 according to the steam heat exchange requirements.

[0049] By adopting the present invention, the steam temperature of the waste incineration power generation unit can be increased, and at the same time, the solar radiation energy can be fully utilized. The oil-steam heat exchanger 8 can increase the steam temperature to a higher level, thereby improving the efficiency of the low-pressure cylinder of the steam turbine. By utilizing the solar radiation energy, the average quality of steam can be improved and the loss during the steam expansion process can be reduced. In addition, the method of heating the steam outside the furnace effectively prevents the heating surface from being severely corroded during the steam reheating process. In addition, coupling solar energy with waste incineration power generation can improve the utilization efficiency of heat and save operating costs.

[0050] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solar reheat coupled waste incineration power generation system, characterized in that: It includes a waste incineration power generation unit, a solar steam reheating unit and a solar primary air preheating unit. The waste incineration power generation unit is connected to the solar steam reheating unit and the solar primary air preheating unit respectively. The solar steam reheating unit is connected to the solar primary air preheating unit. The exhaust steam of the waste incineration power generation unit is reheated and heat is stored and released through the solar steam reheating unit. Preheated air is transported to the waste incineration power generation unit through the solar primary air preheating unit, and waste incineration and power generation are achieved through the waste incineration power generation unit.

2. A solar reheat coupled waste incineration power generation system according to claim 1, characterized in that: The waste incineration power generation unit includes a waste incineration boiler, a steam turbine, a condenser, a low-pressure heater, a deaerator and a feed water pump. The steam turbine is connected to the waste incineration boiler, the condenser, the low-pressure heater and the deaerator respectively. The condenser is connected to the low-pressure heater. The low-pressure heater is connected to the deaerator and then connected to the feed water pump and the waste incineration boiler in sequence.

3. A solar reheat coupled waste incineration power generation system according to claim 2, characterized in that: The low-pressure heater includes a No. 1 low-pressure heater and a No. 2 low-pressure heater. The No. 1 low-pressure heater is connected to the steam turbine, the condenser and the No. 2 low-pressure heater. The No. 2 low-pressure heater is connected to the steam turbine and the deaerator.

4. The solar reheat coupled waste incineration power generation system according to claim 1, characterized in that: The solar steam reheating unit includes a solar collector, an oil-steam heat exchanger, a molten salt heat storage tank and an oil-molten salt heat exchanger. The solar collector is connected to the oil-steam heat exchanger and the oil-molten salt heat exchanger respectively, and the molten salt heat storage tank is connected to the oil-molten salt heat exchanger. The exhaust steam of the waste incineration power generation unit is reheated through the oil-steam heat exchanger, and the heat is stored and released through the molten salt heat storage tank.

5. A solar reheat coupled waste incineration power generation system according to claim 4, characterized in that: The molten salt heat storage tank comprises a hot tank and a cold tank, and the hot tank and the cold tank are respectively connected to the oil-molten salt heat exchanger.

6. A solar reheat coupled waste incineration power generation system according to claim 5, characterized in that: The oil-molten salt heat exchanger includes a No. 1 oil-molten salt heat exchanger and a No. 2 oil-molten salt heat exchanger, both of which are connected to a hot tank and a cold tank. The low-temperature molten salt flows out of the cold tank, passes through the No. 1 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil therein. After absorbing the heat, the low-temperature molten salt flows into the hot tank for storage. When the heat needs to be released, the high-temperature molten salt in the hot tank flows through the No. 2 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger. The heat transfer oil after the heat exchange flows through the oil-steam heat exchanger and the solar primary air preheating unit in turn, reheats the exhaust steam of the waste incineration power generation unit through the oil-steam heat exchanger, and heats the cold air through the solar primary air preheating unit.

7. The solar reheat coupled waste incineration power generation system according to claim 1, characterized in that: The solar primary air preheating unit comprises an air preheater, an air blower and a primary air distributor. The air preheater is connected to the solar steam reheating unit, the air blower and the primary air distributor. The primary air distributor is used to send the heated primary air into the waste incineration boiler.

8. The solar reheat coupled waste incineration power generation system according to claim 7, characterized in that: The inlet pipe of the air preheater is connected to the oil-steam heat exchanger of the solar steam reheat unit, the outlet pipe of the air preheater is connected to the No. 2 oil-molten salt heat exchanger of the solar steam reheat unit through control valve 1, and the outlet pipe of the air preheater is connected to the solar collector and No. 1 oil-molten salt heat exchanger of the solar steam reheat unit through control valve 2.

9. A solar energy reheating coupled waste incineration power generation method, characterized in that: A solar energy reheat coupled waste incineration power generation system as claimed in any one of claims 1 to 8 is used to generate waste incineration power, the method comprising the following steps: In the waste incineration power generation unit, feed water is sent to the waste incineration boiler through a feed water pump for heating, generating superheated steam and being sent to the steam turbine. The steam performs work in the high-pressure cylinder of the steam turbine, and then is sent to the oil-steam heat exchanger and exchanges heat with the heat transfer oil in the oil-steam heat exchanger. The steam is then sent to the low-pressure cylinder of the steam turbine to continue to expand and perform work, and then is sent to the condenser to be condensed into liquid. The condensed water passes through the No. 1 low-pressure heater, the No. 2 low-pressure heater and the deaerator in turn to reach the feed water temperature again, and is sent to the waste incineration boiler by the feed water pump to continue circulation; In the solar steam reheating unit, the heat transfer oil is heated by the solar collector and transported to the oil-steam heat exchanger and the oil-molten salt heat exchanger respectively. The oil-steam heat exchanger will reheat the high-pressure cylinder exhaust steam, and the No. 1 oil-molten salt heat exchanger will heat the molten salt in the molten salt heat storage tank and store the heat through the hot tank; when the heat needs to be released, the high-temperature molten salt in the hot tank flows through the No. 2 oil-molten salt heat exchanger and exchanges heat with the heat transfer oil in the No. 2 oil-molten salt heat exchanger. The heat transfer oil after heat exchange flows through the oil-steam heat exchanger and the air preheater in turn, reheats the high-pressure cylinder exhaust steam through the oil-steam heat exchanger, and heats the cold air through the air preheater; In the solar primary air preheating unit, the blower sends cold air into the air preheater for heating, then into the primary air distributor, and then into the waste incineration boiler to dry and burn the waste.

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