A distributed energy supply system for deep utilization of waste heat

Abstract

The present invention relates to the technical field of power generation and heat supply, and particularly relates to a distributed energy supply system for deep utilization of waste heat. The distributed energy supply system for deep utilization of waste heat includes a gas turbine, a flue gas and hot water type lithium bromide unit, a flue gas - hot water heat exchanger, and a waste heat utilization device; the flue gas outlet of the gas turbine is connected to the flue gas inlet of the flue gas and hot water type lithium bromide unit; the flue gas outlet of the flue gas and hot water type lithium bromide unit is connected to the flue gas inlet of the flue gas - hot water heat exchanger, and the flue gas outlet of the flue gas - hot water heat exchanger is connected to a chimney; the hot water of the flue gas - hot water heat exchanger can enter the flue gas and hot water type lithium bromide unit or the waste heat utilization device for heat exchange. The flue gas of the lithium bromide unit is deeply utilized, the flue gas temperature of the distributed energy system is reduced by 30 °C, and the energy utilization efficiency of the system is increased by 4%.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation and heat supply, and particularly to a distributed energy supply system for deep utilization of waste heat. Background Art

[0002] In the conventional solution, the distributed energy system can be composed of a gas turbine and a flue gas type lithium bromide unit, providing electricity, heat or electricity, cold products to users. In the conventional solution, the gas turbine burns natural gas for power generation, and at the same time, the discharged high-temperature flue gas enters the lithium bromide unit. The lithium bromide unit produces chilled water for air conditioning or heating water, and the flue gas finally discharges from the outlet of the lithium bromide unit, with the flue gas temperature being 150 - 160°C. The conventional solution has the following problems: First, the flue gas temperature of the system is relatively high, and the waste heat is not fully utilized. Second, the power generation output of the gas turbine and the refrigeration / heat output of the lithium bromide unit are strongly correlated, and the cold, heat, and electricity regulation ability of the system and the adaptability to load fluctuations are relatively poor. Third, the lithium bromide unit usually switches between the cooling and heating modes and cannot meet the cold and heat load demands simultaneously. Summary of the Invention

[0003] The purpose of the present invention is to provide a distributed energy supply system for deep utilization of waste heat, which can solve the problems in the existing conventional distributed energy system, such as the relatively high flue gas temperature of the lithium bromide unit, relatively low energy utilization efficiency, strong correlation between electricity and heat (or cold), and poor cold, heat, and electricity regulation ability of the system.

[0004] The present invention provides a distributed energy supply system for deep utilization of waste heat, which includes a gas turbine, a flue gas - hot water type lithium bromide unit, a flue gas - hot water heat exchanger, and a waste heat utilization device;

[0005] The flue gas outlet of the gas turbine is connected to the flue gas inlet of the flue gas - hot water type lithium bromide unit;

[0006] The flue gas outlet of the flue gas - hot water type lithium bromide unit is connected to the flue gas inlet of the flue gas - hot water heat exchanger, and the flue gas outlet of the flue gas - hot water heat exchanger is connected to a chimney;

[0007] The hot water of the flue gas - hot water heat exchanger can enter the flue gas - hot water type lithium bromide unit or the waste heat utilization device for heat exchange.

[0008] Preferably, the waste heat utilization device includes a low - temperature waste heat power generation unit and a water - water heat exchanger.

[0009] Preferably, the flue gas - hot water type lithium bromide unit includes a high - temperature generator and a low - temperature generator;

[0010] The high-temperature generator includes a flue gas inlet and a flue gas outlet of the high-temperature generator. The flue gas inlet of the high-temperature generator is connected to the flue gas outlet of the gas turbine, and the flue gas outlet of the high-temperature generator is connected to the flue gas inlet of the flue gas - hot water heat exchanger;

[0011] The low-temperature generator includes a heat source water inlet and a heat source water outlet of the low-temperature generator;

[0012] The heat source water inlet of the low-temperature generator is connected to the heat source water outlet of the flue gas - hot water heat exchanger, and the heat source water outlet of the low-temperature generator is connected to the heat source water inlet of the flue gas - hot water heat exchanger.

[0013] Preferably, four-way valves V9, V11, and V12 are provided on the connecting pipelines between the low-temperature waste heat power generation unit, the water - water heat exchanger, the low-temperature generator and the flue gas - hot water heat exchanger;

[0014] By controlling the four-way valves V9, V11, and V12, the flow direction of the heat source water is controlled to the low-temperature waste heat power generation unit, the water - water heat exchanger or the low-temperature generator of the flue gas - hot water type lithium bromide unit.

[0015] Preferably, a three-way valve V1 is provided at the flue gas inlet of the flue gas - hot water type lithium bromide unit, and a manual butterfly valve V2 is provided at the flue gas outlet;

[0016] A three-way valve V3 is provided at the flue gas inlet of the flue gas - hot water heat exchanger, and a manual butterfly valve V4 is provided at the flue gas outlet;

[0017] An electric stop valve V6 is provided at the heat source water inlet of the flue gas - hot water type lithium bromide unit, and an electric stop valve V5 is provided at the heat source water outlet;

[0018] A stop valve V7 is provided at the heat source water outlet of the flue gas - hot water heat exchanger, and a stop valve V8 is provided at the heat source water inlet;

[0019] An electric stop valve V10 is provided at the heat source water outlet of the low-temperature waste heat power generation unit, and an electric stop valve V13 is provided at the heat source water inlet;

[0020] An electric stop valve V14 is provided at the heat source water inlet of the water - water heat exchanger, and an electric stop valve V15 is provided at the heat source water outlet;

[0021] A heat source water pump is provided on the pipeline between the stop valve V8 and the four-way valve V9.

[0022] Preferably, controlling the heat source water to flow to the low-temperature waste heat power generation unit includes the following steps:

[0023] The gas turbine burns natural gas for power generation. The exhausted flue gas enters from the left side of the flue gas three-way valve V1, and the flue gas enters the high-temperature generator of the flue gas hot water type lithium bromide unit from below the three-way valve V1, driving the flue gas hot water type lithium bromide unit to supply air-conditioning water according to the refrigeration or heating condition. The flue gas discharged from the high-temperature generator of the flue gas hot water type lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas discharged from the right side of the three-way valve V1, enters the left side of the three-way valve V3, and the flue gas enters the flue gas-water heat exchanger from below the three-way valve V3 to heat the heat source water, and then is discharged through the manual butterfly valve V4, mixes with the flue gas discharged from the right side of the three-way valve V3, and finally is discharged into the atmosphere through the chimney;

[0024] The heat source water is boosted by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-water heat exchanger to increase the temperature, and successively passes through the stop valve V7, above and to the right of the four-way valve V11, to the left and right of the four-way valve V12, and the electric stop valve V13, enters the low-temperature waste heat generating unit for heat exchange, drives the low-temperature waste heat generating unit to generate electricity, and the heat source water after the temperature drops successively passes through the electric stop valve V10, to the right and left of the four-way valve V9, and flows into the heat source water pump P1 to complete the cycle.

[0025] Preferably, controlling the flow of the heat source water to the low-temperature generator of the flue gas hot water type lithium bromide unit includes the following steps:

[0026] The gas turbine burns natural gas for power generation. The exhausted flue gas enters from the left side of the flue gas three-way valve V1, and the flue gas enters the high-temperature generator of the flue gas hot water type lithium bromide unit from below the three-way valve V1, driving the flue gas hot water type lithium bromide unit to supply chilled air-conditioning water according to the refrigeration condition. The flue gas discharged from the high-temperature generator of the flue gas hot water type lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas discharged from the right side of the three-way valve V1, enters the left side of the three-way valve V3, and the flue gas enters the flue gas-water heat exchanger from below the three-way valve V3 to heat the heat source water, and then is discharged through the manual butterfly valve V4, mixes with the flue gas discharged from the right side of the three-way valve V3, and finally is discharged into the atmosphere through the chimney;

[0027] The heat source water is boosted by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-water heat exchanger to increase the temperature, and successively passes through the stop valve V7, above and to the left of the four-way valve V11, and the electric stop valve V6, enters the low-temperature generator of the flue gas hot water type lithium bromide unit, drives the flue gas hot water type lithium bromide unit to supply air-conditioning water according to the refrigeration condition, and the heat source water flows out from the low-temperature generator of the flue gas hot water type lithium bromide unit after the temperature drops, successively passes through the electric stop valve V5, below and above the four-way valve V12, below and to the left of the four-way valve V9, and flows into the heat source water pump P1 to complete the cycle.

[0028] Preferably, controlling the flow of the heat source water to the water-water heat exchanger includes the following steps:

[0029] The gas turbine burns natural gas for power generation. The exhausted flue gas enters from the left side of the three-way valve V1, and then enters the high-temperature generator of the flue gas-hot water lithium bromide unit from below the three-way valve V1, driving the flue gas-hot water lithium bromide unit to supply air-conditioning water according to the refrigeration or heating condition. The flue gas discharged from the high-temperature generator of the flue gas-hot water lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas discharged from the right side of the three-way valve V1, enters the left side of the three-way valve V3, and then enters the flue gas-hot water heat exchanger from below the three-way valve V3 to heat the heat source water. After that, it is discharged through the manual butterfly valve V4, mixes with the flue gas discharged from the right side of the three-way valve V3, and finally is discharged into the atmosphere through the chimney.

[0030] The heat source water is boosted in pressure by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-hot water heat exchanger to increase the temperature, successively passes through the stop valve V7, above and below the four-way valve V11, and the electric stop valve V14, enters the water-water heat exchanger to increase the temperature of the air-conditioning water and supply heat to users. After the temperature of the heat source water decreases, it flows out of the water-water heat exchanger, successively passes through the electric stop valve V15, above and to the left of the four-way valve V9, and flows into the heat source water pump P1 to complete the cycle.

[0031] Preferably, by adjusting the flue gas volume on the right and below of the three-way valve V1, the refrigeration or heating output of the flue gas-hot water lithium bromide unit is adjusted.

[0032] Preferably, by adjusting the flue gas volume on the right and below of the three-way valve V3, the heat output of the flue gas-hot water heat exchanger is adjusted.

[0033] Beneficial effects:

[0034] 1. Deeply utilize the exhaust gas of the lithium bromide unit, reduce the exhaust gas temperature of the distributed energy system by 30 °C, and improve the energy utilization efficiency of the system by 4%.

[0035] 2. Set a flue gas-hot water heat exchanger at the flue gas outlet of the lithium bromide unit, which can produce hot water. The hot water can enter the low-temperature waste heat power generation unit for power generation, or enter the flue gas-hot water lithium bromide unit for refrigeration, or supply heat through the heat exchanger, improving the cold, heat and power regulation ability of the system and the adaptability to load fluctuations.

[0036] 3. The combined cooling, heat and power supply system can generate electricity, supply cooling and heat simultaneously, meeting the various energy needs of users. Description of the drawings

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 Schematic diagram of the distributed energy supply system for deep utilization of waste heat provided by the specific embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the system provided by the specific embodiment of the present invention in the state of prior power generation with heat source water;

[0040] Figure 3 Schematic diagram of the system provided by the specific embodiment of the present invention in the state of prior refrigeration with heat source water;

[0041] Figure 4 Schematic diagram of the system provided by the specific embodiment of the present invention in the state of prior heating with heat source water.

[0042] Explanation of reference numerals:

[0043] 1: Gas turbine; 2: Flue gas hot water type lithium bromide unit; 3: Flue gas - hot water heat exchanger; 4: Low - temperature waste heat power generation unit; 5: Water - water heat exchanger. Specific embodiment

[0044] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0046] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "installed", "connected", and "coupled" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] As Figure 1 shown, this embodiment provides a distributed energy supply system for deep utilization of waste heat, which is characterized by comprising a gas turbine 1, a flue gas hot water type lithium bromide unit 2, a flue gas - hot water heat exchanger 3, and a waste heat utilization device;

[0048] The flue gas outlet of the gas turbine 1 is connected to the flue gas inlet of the flue gas hot water type lithium bromide unit 2;

[0049] The flue gas outlet of the flue gas hot water type lithium bromide unit 2 is connected to the flue gas inlet of the flue gas - hot water heat exchanger 3, and the flue gas outlet of the flue gas - hot water heat exchanger 3 is connected to the chimney;

[0050] The hot water of the flue gas - hot water heat exchanger 3 can enter the flue gas hot water type lithium bromide unit 2 or the waste heat utilization device for heat exchange.

[0051] The waste heat utilization device includes a low - temperature waste heat power generation unit 4 and a water - water heat exchanger 5.

[0052] This solution consists of a gas turbine 1, a flue gas hot water type lithium bromide unit 2, a flue gas - hot water heat exchanger 3, a low - temperature waste heat power generation unit 4, a water - water heat exchanger 5, etc. It can adjust the cold, heat, and power output of the system according to the user load fluctuation, and provide multiple energy services for users. At the same time, this solution deeply utilizes the exhaust gas of the lithium bromide unit, improving the system energy efficiency by 4%. The gas turbine 1 burns natural gas for power generation and discharges high - temperature flue gas. The flue gas hot water type lithium bromide unit 2 can supply chilled water or hot water for air conditioning, and has two generators, a high - temperature generator and a low - temperature generator. The flue gas enters the high - temperature generator for heat exchange, and the heat source water enters the low - temperature generator for heat exchange. For the flue gas - hot water heat exchanger, after the exhaust gas of the gas turbine and the exhaust gas of the lithium bromide unit are mixed, they are heat - exchanged with the heat source water to increase the temperature of the heat source water. The low - temperature waste heat power generation unit 4 generates power through the circulation of the heat source water. The water - water heat exchanger 5 heats the air - conditioning circulating water with the heat source water to provide air - conditioning hot water for users.

[0053] The system can operate in the following three modes:

[0054] (1) The heat source water is given priority for power generation.

[0055] The system can simultaneously provide electrical and thermal energy, or electrical and cooling energy.

[0056] As Figure 2 shown, the system operates in the following manner. The gas turbine 1 burns natural gas for power generation, and the exhausted flue gas enters from the left side of the flue gas three-way valve V1. 70% of the flue gas enters the high-temperature generator of the flue gas-hot water lithium bromide unit from below the three-way valve V1, driving the flue gas-hot water lithium bromide unit 2 to supply chilled water according to the refrigeration or heating condition. The flue gas discharged from the high-temperature generator of the flue gas-hot water lithium bromide unit passes through the manual butterfly valve V2 and is mixed with 30% of the flue gas discharged from the right side of the flue gas three-way valve V1, then enters the left side of the three-way valve V3. 80% - 100% of the flue gas enters the flue gas-hot water heat exchanger 3 from below the three-way valve V3 to heat the heat source water, and then is discharged through the manual butterfly valve V4. It is mixed with 0 - 20% of the flue gas discharged from the right side of the flue gas three-way valve V3, and finally is discharged into the atmosphere through the chimney.

[0057] The heat source water is boosted by the heat source water pump P1, passes through the globe valve V8, enters the flue gas-hot water heat exchanger 3 to increase the temperature, successively passes through the globe valve V7, above and to the right of the four-way valve V11, to the left and right of the four-way valve V12, and the motorized globe valve V13, enters the low-temperature waste heat generating unit 4 for heat exchange, driving the low-temperature waste heat generating unit to generate electricity. The heat source water with reduced temperature successively passes through the motorized globe valve V10, to the right and left of the four-way valve V9, and flows into the heat source water pump P1 to complete the cycle.

[0058] The system can adjust the output of the 4 low-temperature waste heat generating units by regulating the flue gas volume on the right and below of the three-way valve V3.

[0059] (2) The heat source water is given priority for refrigeration.

[0060] The system can simultaneously provide electrical and cooling energy.

[0061] As Figure 3As shown in the figure, the system operates as follows. The gas turbine 1 burns natural gas to generate electricity. The exhausted flue gas enters through the left side of the flue gas three-way valve V1. 70% of the flue gas enters the high-temperature generator of the flue gas hot water lithium bromide unit from below the three-way valve V1, driving the flue gas hot water lithium bromide unit 2 to supply chilled water for air conditioning according to the refrigeration condition. The flue gas discharged from the high-temperature generator of the flue gas hot water lithium bromide unit passes through the manual butterfly valve V2 and mixes with 30% of the flue gas discharged from the right side of the flue gas three-way valve V1, then enters the left side of the three-way valve V3. 80% - 100% of the flue gas enters the flue gas - hot water heat exchanger 3 from below the three-way valve V3 to heat the heat source water, and then is discharged through the manual butterfly valve V4. It mixes with 0 - 20% of the flue gas discharged from the right side of the three-way valve V3 and finally is discharged into the atmosphere through the chimney.

[0062] The heat source water is boosted in pressure by the heat source water pump P1, passes through the stop valve V8, enters the flue gas - hot water heat exchanger 3 to increase the temperature, successively passes through the stop valve V7, above and to the left of the four-way valve V11, and the electric stop valve V6, and then enters the low-temperature generator of the flue gas hot water lithium bromide unit, driving the flue gas hot water lithium bromide unit 2 to supply air conditioning water according to the refrigeration condition. After the temperature of the heat source water decreases, it flows out from the low-temperature generator of the flue gas hot water lithium bromide unit, successively passes through the electric stop valve V5, below and above the four-way valve V12, and below and to the left of the four-way valve V9, and then flows into the heat source water pump P1 to complete the cycle.

[0063] The system can adjust the refrigeration output of the flue gas hot water lithium bromide unit 2 by regulating the flue gas volume on the right side and below the three-way valve V3.

[0064] (3) The heat source water gives priority to heat supply.

[0065] The system can provide electricity, heat, and cold or electricity and heat energy simultaneously.

[0066] As Figure 4 shown in the figure, the system operates as follows. The gas turbine 1 burns natural gas to generate electricity. The exhausted flue gas enters through the left side of the flue gas three-way valve V1. 50 - 70% of the flue gas enters the high-temperature generator of the flue gas hot water lithium bromide unit from below the three-way valve V1, driving the flue gas hot water lithium bromide unit 2 to supply air conditioning water according to the refrigeration or heating condition. The flue gas discharged from the high-temperature generator of the flue gas hot water lithium bromide unit passes through the manual butterfly valve V2 and mixes with 30 - 50% of the flue gas discharged from the right side of the flue gas three-way valve V1, then enters the left side of the three-way valve V3. 80% - 100% of the flue gas enters the flue gas - hot water heat exchanger 3 from below the three-way valve V3 to heat the heat source water, and then is discharged through the manual butterfly valve V4. It mixes with 0 - 20% of the flue gas discharged from the right side of the three-way valve V3 and finally is discharged into the atmosphere through the chimney.

[0067] The heat source water is boosted in pressure by the heat source water pump P1, passes through the globe valve V8, enters the flue gas - hot water heat exchanger 3 to increase the temperature, successively passes through the globe valve V7, above and below the four - way valve V11, the motorized globe valve V14, enters the water - water heat exchanger 5, raises the temperature of the air - conditioning water to supply heat to users. After the temperature of the heat source water drops, it flows out from the water - water heat exchanger 5, successively passes through the motorized globe valve V15, above and to the left of the four - way valve V9, and flows into the heat source water pump P1 to complete the cycle.

[0068] The system can adjust the cooling or heating output of the flue gas - hot water type lithium bromide unit 2 by adjusting the flue gas volume on the right and below of the three - way valve V1.

[0069] The system can adjust the heating output of the water - water heat exchanger 5 by adjusting the flue gas volume on the right and below of the three - way valve V3.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A distributed energy supply system for deep utilization of waste heat, characterized in that: It includes a gas turbine, a flue gas hot water type lithium bromide unit, a flue gas-hot water heat exchanger and a waste heat utilization device; The flue gas outlet of the gas turbine is connected to the flue gas inlet of the flue gas hot water type lithium bromide unit; The flue gas outlet of the flue gas hot water type lithium bromide unit is connected to the flue gas inlet of the flue gas-hot water heat exchanger, and the flue gas outlet of the flue gas-hot water heat exchanger is connected to the chimney; The hot water from the flue gas-hot water heat exchanger can enter the flue gas hot water type lithium bromide unit or the waste heat utilization device for heat exchange; The waste heat utilization device includes a low-temperature waste heat generator set and a water-water heat exchanger; The flue gas hot water type lithium bromide unit includes a high temperature generator and a low temperature generator; The low-temperature waste heat generator set, the water-water heat exchanger and the connecting pipeline between the low-temperature generator and the flue gas-hot water heat exchanger are provided with a four-way valve V9, a four-way valve V11 and a four-way valve V12; By controlling the four-way valve V9, four-way valve V11 and four-way valve V12, the heat source water is controlled to flow to the low-temperature generator of the low-temperature waste heat generator set, the water-water heat exchanger or the flue gas hot water type lithium bromide unit; The flue gas hot water type lithium bromide unit is provided with a three-way valve V1 at the flue gas inlet and a manual butterfly valve V2 at the flue gas outlet; The flue gas inlet of the flue gas-hot water heat exchanger is provided with a three-way valve V3, and the flue gas outlet is provided with a manual butterfly valve V4; The heat source water inlet of the flue gas hot water type lithium bromide unit is provided with an electric stop valve V6, and the heat source water outlet is provided with an electric stop valve V5; The heat source water outlet of the flue gas-hot water heat exchanger is provided with a stop valve V7, and the heat source water inlet is provided with a stop valve V8; The heat source water outlet of the low-temperature waste heat power generation unit is provided with an electric stop valve V10, and the heat source water inlet is provided with an electric stop valve V13; The heat source water inlet of the water-water heat exchanger is provided with an electric stop valve V14, and the heat source water outlet is provided with an electric stop valve V15; A heat source water pump is provided on the pipeline between the stop valve V8 and the four-way valve V9; Controlling the flow of heat source water to the low-temperature waste heat generator set includes the following steps: The gas turbine burns natural gas to generate electricity, and the exhaust flue gas enters through the left side of the flue gas three-way valve V1. The flue gas enters the high-temperature generator of the flue gas hot water type lithium bromide unit from the bottom of the three-way valve V1, driving the flue gas hot water type lithium bromide unit to supply air-conditioning water according to the cooling or heating conditions. The flue gas exhausted from the high-temperature generator of the flue gas hot water type lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas exhausted from the right side of the three-way valve V1, and enters the left side of the three-way valve V3. The flue gas enters the flue gas-hot water heat exchanger from the bottom of the three-way valve V3, heats the heat source water, and is then discharged through the manual butterfly valve V4, mixed with the flue gas exhausted from the right side of the three-way valve V3, and finally discharged into the atmosphere through the chimney; The heat source water is pressurized by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-hot water heat exchanger to increase the temperature, passes through the stop valve V7, the top and right side of the four-way valve V11, the left and right side of the four-way valve V12, and the electric stop valve V13, enters the low-temperature waste heat generator set for heat exchange, drives the low-temperature waste heat generator set to generate electricity, and the heat source water with lowered temperature passes through the electric stop valve V10, the right and left side of the four-way valve V9 in turn, and flows into the heat source water pump P1 to complete the cycle.

2. The distributed energy supply system for deep utilization of waste heat according to claim 1 is characterized in that: The high temperature generator comprises a high temperature generator flue gas inlet and a high temperature generator flue gas outlet, the high temperature generator flue gas inlet is connected to the flue gas outlet of the gas turbine, and the high temperature generator flue gas outlet is connected to the flue gas inlet of the flue gas-hot water heat exchanger; The low-temperature generator comprises a low-temperature generator heat source water inlet and a low-temperature generator heat source water outlet; The heat source water inlet of the low-temperature generator is connected to the heat source water outlet of the flue gas-hot water heat exchanger, and the heat source water outlet of the low-temperature generator is connected to the heat source water inlet of the flue gas-hot water heat exchanger.

3. The distributed energy supply system for deep utilization of waste heat according to claim 1 is characterized in that: Controlling the flow of heat source water to the low temperature generator of the flue gas hot water type lithium bromide unit includes the following steps: The gas turbine burns natural gas to generate electricity, and the exhaust flue gas enters through the left side of the flue gas three-way valve V1. The flue gas enters the high-temperature generator of the flue gas hot water type lithium bromide unit from the bottom of the three-way valve V1, driving the flue gas hot water type lithium bromide unit to supply air-conditioning cold water according to the refrigeration condition. The flue gas exhausted from the high-temperature generator of the flue gas hot water type lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas exhausted from the right side of the three-way valve V1, and enters the left side of the three-way valve V3. The flue gas enters the flue gas-hot water heat exchanger from the bottom of the three-way valve V3, heats the heat source water, and is then discharged through the manual butterfly valve V4, mixed with the flue gas exhausted from the right side of the three-way valve V3, and finally discharged into the atmosphere through the chimney; The heat source water is pressurized by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-hot water heat exchanger to increase the temperature, passes through the stop valve V7, the top and left side of the four-way valve V11, and the electric stop valve V6, and enters the low-temperature generator of the flue gas hot water type lithium bromide unit, driving the flue gas hot water type lithium bromide unit to supply air-conditioning water according to the refrigeration condition. After the temperature of the heat source water is reduced, it flows out of the low-temperature generator of the flue gas hot water type lithium bromide unit, passes through the electric stop valve V5, the bottom and top of the four-way valve V12, the bottom and left side of the four-way valve V9, and flows into the heat source water pump P1 to complete the cycle.

4. The distributed energy supply system for deep utilization of waste heat according to claim 1 is characterized in that: Controlling the flow of heat source water to the water-water heat exchanger includes the following steps: The gas turbine burns natural gas to generate electricity, and the exhaust flue gas enters through the left side of the three-way valve V1. The flue gas enters the high-temperature generator of the flue gas hot water type lithium bromide unit from the bottom of the three-way valve V1, driving the flue gas hot water type lithium bromide unit to supply air-conditioning water according to the cooling or heating conditions. The flue gas exhausted from the high-temperature generator of the flue gas hot water type lithium bromide unit passes through the manual butterfly valve V2, mixes with the flue gas exhausted from the right side of the three-way valve V1, and enters the left side of the three-way valve V3. The flue gas enters the flue gas-hot water heat exchanger from the bottom of the three-way valve V3, heats the heat source water, and is then discharged through the manual butterfly valve V4, mixed with the flue gas exhausted from the right side of the three-way valve V3, and finally discharged into the atmosphere through the chimney; The heat source water is pressurized by the heat source water pump P1, passes through the stop valve V8, enters the flue gas-hot water heat exchanger to increase the temperature, passes through the stop valve V7, the top and bottom of the four-way valve V11, and the electric stop valve V14 in turn, enters the water-water heat exchanger to increase the air-conditioning water temperature to supply heat to users. After the heat source water temperature is reduced, it flows out of the water-water heat exchanger, passes through the electric stop valve V15, the top and left side of the four-way valve V9 in turn, and flows into the heat source water pump P1 to complete the cycle.

5. The distributed energy supply system for deep utilization of waste heat according to claim 1, 3 or 4, characterized in that: By adjusting the flue gas volume on the right and bottom of the three-way valve V1, the cooling or heating output of the flue gas hot water type lithium bromide unit can be adjusted.

6. The distributed energy supply system for deep utilization of waste heat according to claim 1, 3 or 4, characterized in that: By adjusting the flue gas volume on the right and bottom of the three-way valve V3, the heat output of the flue gas-hot water heat exchanger is adjusted.

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