Natural gas combined cooling heating and power energy control system

Abstract

The utility model discloses a natural gas combined cooling heating and power energy control system, and relates to the technical field of energy supply and control. The system is composed of an energy supply module, a waste heat utilization module, a cooling and assisting module and an energy control and monitoring module. The energy supply module generates power through a fuel gas internal combustion generator set and introduces natural gas to guarantee fuel supply. The waste heat utilization module fully utilizes high-temperature flue gas and high-temperature cylinder sleeve water generated by power generation to realize refrigeration, heating and hot water supply; the cooling and auxiliary module cools and dissipates heat of the equipment to guarantee operation; the energy control and monitoring module can realize manual / time control and is divided into multiple modes, a generator is started in a remote / manual mode, the power is adjusted, and the monitoring system masters various parameters in real time and generates a report. According to the system, gradient utilization of energy is achieved, natural gas clean energy is adopted, tail gas denitration standard-reaching emission is achieved, energy benefit maximization is achieved through intelligent control, reliability and stability are improved through system integrated design, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of energy supply and control technology, more specifically, it relates to a natural gas combined cooling heating and power energy control system. BACKGROUND

[0002] With the continuous development of modern society, the demand for energy in the field of construction is increasing, and higher requirements for the quality, efficiency and environmental protection of energy supply are also put forward. In the energy supply system of various buildings (especially large buildings such as hotels and commercial complexes), the traditional energy supply mode gradually exposes many shortcomings.

[0003] The traditional energy supply system often adopts a single energy supply mode, for example, hotels usually set up refrigeration machine rooms for summer refrigeration, are equipped with boiler rooms to meet the winter heating demand, and also need separate equipment to provide domestic hot water, and each energy supply subsystem is relatively independent, lacking effective cooperation and integration between each other, which leads to the inability of energy to realize cascade utilization, and low energy utilization efficiency. Due to the relative independence of each energy system, it is difficult to flexibly and quickly adjust the energy supply strategy when responding to the energy demand of different periods and different seasons in the building, and it is difficult to realize the precise matching of energy supply and actual demand, which further affects the economy of energy use. The traditional energy supply mode, especially those relying on traditional fossil fuels such as coal and lacking effective environmental protection measures, will produce a large amount of pollutants such as sulfur dioxide, nitrogen oxides and particulate matter during combustion, causing serious pollution to the atmospheric environment, not meeting the increasingly high environmental emission standards and the requirements of the concept of sustainable development.

[0004] In view of the above, in view of the many problems existing in the traditional energy supply system in terms of energy utilization efficiency, operation management and environmental protection performance, there is an urgent need for an energy supply control system that is more efficient, intelligent and environmentally friendly, realizes the joint supply and collaborative management of multiple energy forms, meets the increasingly diversified energy demand of modern buildings, and meets strict environmental protection requirements. UTILITY MODEL CONTENT

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a natural gas combined cooling heating and power energy control system.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] A natural gas combined cooling heating and power energy control system, comprising an energy supply module, a waste heat utilization module, a cooling and auxiliary module, and an energy control and monitoring module;

[0008] The energy supply module comprises an energy station generator set and a natural gas supply unit;

[0009] The waste heat utilization unit comprises a flue gas hot water type lithium bromide unit, a heating hot water plate heat exchanger, a flue gas hot water heat exchanger, a sanitary hot water plate heat exchanger, a water collector and a water distributor;

[0010] The cooling and auxiliary module is provided with a lithium bromide unit cooling tower, a flue gas denitration unit and a heat storage device.

[0011] The energy control and monitoring module comprises a control system and a monitoring system.

[0012] Preferably, the energy station generator set adopts a gas internal combustion generator set, and the waste heat generated after power generation of the generator set comprises high-temperature flue gas and high-temperature cylinder jacket water.

[0013] The auxiliary equipment of the generator set comprises a generator soundproof cover, a generator inlet and exhaust fan, a generator inlet and exhaust silencer, a heptafluoropropane gas fire extinguishing system, a cylinder jacket water diaphragm expansion water tank, a middle cooling water diaphragm expansion water tank, a cylinder jacket water pump, a cylinder jacket water air cooler, a middle cooling water pump, a middle cooling water air cooler, a primary and secondary flue gas silencer, a generator oil supplement system, an auxiliary power distribution cabinet and a grid-connected control cabinet.

[0014] The natural gas supply unit is responsible for introducing and pressure regulating the natural gas from the municipal medium-pressure gas pipe network and then delivering the natural gas to the generator set.

[0015] Preferably, the generator soundproof cover is provided with a gas fire extinguishing system; the generator inlet and exhaust fans are arranged inside the inlet and exhaust air pipes in the soundproof cover; the generator inlet and exhaust silencers are respectively installed on the generator inlet and exhaust pipes; the gas cylinder cabinet of the heptafluoropropane gas fire extinguishing system is located near the soundproof cover; the cylinder jacket water pump is installed in the energy station water pump house; the cylinder jacket water air cooler is installed on the energy station machine house roof; the middle cooling water pump is installed in the energy station water pump house; the middle cooling water air cooler is installed on the energy station machine house roof; the primary and secondary flue gas silencers are installed on the generator exhaust pipe; the generator oil supplement system is located near the soundproof cover; and the auxiliary power distribution cabinet and the grid-connected control cabinet are installed in the energy station control room.

[0016] Preferably, the flue gas hot water type lithium bromide unit is installed in the energy station machine room; the heating hot water plate heat exchanger is installed near the flue gas machine of the energy station; the flue gas hot water heat exchanger is installed in the energy station machine room; the sanitary hot water plate heat exchanger is installed in the energy station water pump house; and the water collector and the water distributor are connected with the flue gas hot water type lithium bromide unit.

[0017] Preferably, the lithium bromide unit cooling station is installed on the roof of the energy station machine room; the flue gas denitration unit is installed in the energy station machine room; and the heat storage device is arranged in the hotel refrigeration room.

[0018] Preferably, the control system can realize manual / time control, divides winter, summer and three transition season modes, and the generator starts to be divided into remote / manual state, and the power generation power can be adjusted according to different states; the monitoring system can monitor a plurality of parameters in the generator set, the operation state of the flue gas hot water type lithium bromide unit, various flows, heat, temperature and energy consumption in the system, and generate data reports.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1、 the utility model discloses a cold heat and power cogeneration system realizes the step -by -step utilization of energy, and the waste heat generated by gas power generation is fully utilized for refrigeration, heating and hot water supply, thereby significantly improving energy utilization efficiency and saving energy compared with traditional energy supply modes.

[0021] 2、 the utility model discloses clean energy natural gas is used as fuel, and tail gas is discharged after denitration treatment, thereby reducing pollutant emission and meeting environmental protection requirements, and providing guarantee for sustainable development of hotels and other buildings.

[0022] 3、 the utility model discloses an intelligent control system can automatically adjust operation mode and equipment working condition according to different seasons, different time periods and system end load change, thereby realizing energy utilization benefit maximization, reducing manual operation cost and operation management difficulty, and achieving the effect of energy saving and environmental protection.

[0023] 4、 the utility model discloses system integration design, reduces equipment quantity and floor area, and each equipment cooperates, thereby improving system reliability and stability, reducing equipment failure rate and maintenance cost. DRAWINGS

[0024] Figure 1 a schematic diagram of a natural gas cold heat and power cogeneration energy control system is provided for the utility model;

[0025] Figure 2 a heating season energy station operation process flow chart is provided for the utility model;

[0026] Figure 3 a refrigeration season energy station operation process flow chart is provided for the utility model;

[0027] Figure 4 a transition season energy station operation process flow chart is provided for the utility model;

[0028] Figure 5 a gas internal combustion generator internal data schematic diagram is provided for the utility model;

[0029] Figure 6The utility model provides a flue gas hot water type lithium bromide unit internal data schematic diagram;

[0030] Figure 7 The utility model provides a device control parameter schematic diagram;

[0031] Figure 8 The utility model provides an energy station energy supply system data monitoring result schematic diagram;

[0032] Figure 9 The utility model provides a free energy consumption report schematic diagram;

[0033] Figure 10 The utility model provides a cooling water area pressure historical data report schematic diagram;

[0034] Figure 11 The utility model provides a cold water area temperature historical data report schematic diagram;

[0035] Figure 12 The utility model provides a heat storage heat pump measurement area energy historical data report schematic diagram;

[0036] Figure 13 The utility model provides a cold water area pressure historical data report schematic diagram;

[0037] Figure 14 The utility model provides a hot and cold water area pressure historical data report schematic diagram;

[0038] Figure 15 The utility model provides a heat storage heat pump measurement area energy historical data report schematic diagram. Specific implementation

[0039] The embodiment further illustrates the natural gas combined cooling heating and power energy control system of the utility model.

[0040] Refer to Figure 1 A natural gas combined cooling heating and power energy control system, comprising an energy supply module, a waste heat utilization module, a cooling and auxiliary module and an energy control and monitoring module.

[0041] The energy supply module comprises an energy station generator set and a natural gas supply unit.

[0042] The waste heat utilization unit comprises a flue gas hot water type lithium bromide unit, a heating hot water plate heat exchanger, a flue gas hot water heat exchanger, a sanitary hot water plate heat exchanger, a water collector and a water distributor.

[0043] The cooling and auxiliary module is provided with a lithium bromide unit cooling tower, a flue gas denitration unit and a heat storage device.

[0044] The energy control and monitoring module comprises a control system and a monitoring system.

[0045] The energy station is configured with an 800kW gas internal combustion generator set; the generator set generates main residual heat in the form of high-temperature flue gas (tail gas temperature 451℃, wet tail gas flow 4680kg / h when the generator is running at 100% load), high-temperature cylinder jacket water (inlet and outlet water temperature 84 / 92℃, minimum / maximum flow 39 / 60m / h); the power supply for starting the generator and the supporting equipment is provided by the municipal power supply, and the power supply after the generator is started is provided by the generator;

[0046] The auxiliary equipment provided by the generator set includes a generator soundproof cover, a generator inlet and exhaust fan, a generator inlet and exhaust silencer, a heptafluoropropane gas fire extinguishing system, a cylinder jacket water diaphragm expansion tank, a middle cooling water diaphragm expansion tank, a cylinder jacket water pump, a cylinder jacket water air cooler, a middle cooling water pump, a middle cooling water air cooler, a primary and secondary flue gas silencer, a generator oil supplementing system, an auxiliary power distribution cabinet and a grid-connected control cabinet;

[0047] The generator soundproof cover is 1 set, and the size thereof is 5.5m*2.7m*3.1m (L*W*H); according to the noise control requirement, the noise measured at a horizontal distance of 1m and a vertical distance of 1.2m from the soundproof cover is ≤85dBA; the soundproof cover is provided with a gas fire extinguishing system inside;

[0048] The generator inlet and exhaust fans and the inlet and exhaust fans of the generator are arranged inside the inlet and exhaust air ducts of the soundproof cover;

[0049] The generator inlet and exhaust silencers are respectively installed on the generator inlet and exhaust pipelines; the generator adopts an upper inlet and exhaust mode; both the inlet and exhaust adopt two-stage noise reduction, and the noise value at a distance of 1m from the inlet and exhaust openings after noise reduction is required to be ≤65dBA;

[0050] The heptafluoropropane gas fire extinguishing system is 1 set; the gas cylinder cabinet is located at a nearby position outside the soundproof cover;

[0051] The cylinder jacket water diaphragm expansion tank is 1, and the middle cooling water diaphragm expansion tank is 1;

[0052] The cylinder jacket water pump is 1, the flow thereof is 48m / h, and the lift thereof is 20m; the cylinder jacket water pump is installed in the water pump house of the energy station;

[0053] The cylinder jacket water air cooler is 1, the heat dissipation capacity thereof is 329kW, the inlet and outlet water temperatures thereof are 92 / 84℃, and the cylinder jacket water air cooler is installed on the roof of the machine house of the energy station;

[0054] The middle cooling water pump is 1, the flow thereof is 10m / h, and the lift thereof is 25m; the middle cooling water pump is installed in the water pump house of the energy station;

[0055] The said one unit of water-air cooler with heat dissipation capacity of 42kW, inlet and outlet water temperature of 50 / 45℃, is installed on the roof of the energy station building;

[0056] The said one unit of primary and secondary smoke silencer is installed on the smoke exhaust pipe of the generator;

[0057] The said oil supplement system of the generator, with one unit of 100L oil tank with liquid level display and one unit of KCB55 gear oil pump, is installed near the soundproof cover outside.

[0058] The said one unit of auxiliary power distribution cabinet (HAS) and one unit of grid-connected control cabinet are installed in the control room of the energy station.

[0059] The said natural gas supply unit is responsible for introducing and regulating the natural gas from the municipal medium-pressure gas pipe network and then delivering it to the generator set.

[0060] The energy station is equipped with one unit of smoke hot water type lithium bromide unit as the main waste heat utilization equipment; the inlet and outlet water temperatures of the smoke hot water type lithium bromide unit for chilled water and hot water are determined according to the chilled water and heating water temperatures of the original cold and heat source system of the hotel; the unit is installed in the energy station building;

[0061] The input energy of the said smoke hot water type lithium bromide unit is the high-temperature flue gas and high-temperature cylinder jacket water generated by the generator; when the generator operates at 100% load, i.e. the flue gas temperature is 451℃, the wet exhaust gas flow is 4650kg / h, the inlet and outlet water temperatures of the cylinder jacket water are 84 / 92℃, and the flow is 51m / h, the refrigeration / heating capacity of the unit is 1006 / 477kW respectively;

[0062] The chilled water produced under refrigeration condition is 7 / 12℃, and the chilled water flow is 173m / h; the hot water produced under heating condition is 65 / 55℃, and the hot water flow is 79m / h; the inlet and outlet water temperatures of the unit are 32 / 37℃, and the flow is 336m / h; the operating weight of the unit is 19.1t; the temperature of the flue gas decreases to about 110℃ after being utilized by the smoke hot water type lithium bromide unit, and the pressure loss of the flue gas is 2kPa.

[0063] The said heating hot water plate heat exchanger is used to preheat the generator cylinder jacket water in the heating season, and then the preheated water enters the smoke generator to produce 60 / 50℃ hot water for hotel heating; the energy station is equipped with one unit of heating hot water plate heat exchanger, which is installed beside the smoke generator of the energy station.

[0064] The said smoke hot water heat exchanger is used to utilize the remaining heat in the flue gas whose temperature has decreased to 110℃ after being utilized by the smoke hot water type lithium bromide unit; the energy station is equipped with one unit of smoke hot water heat exchanger, which is used to produce 80 / 60℃ sanitary hot water heat medium for hotel use; the smoke hot water heat exchanger is installed in the energy station building, and the outlet temperature of the flue gas after being utilized is 70℃, which is discharged to the outdoor atmosphere through the chimney.

[0065] The sanitary hot water plate heat exchanger, in the transition season and the refrigeration season or the heating season system load is low, can not fully utilize the waste heat of power generation, the high temperature cylinder jacket water generated by the generator enters the sanitary hot water plate heat exchanger and exchanges heat with the sanitary hot water heat medium, and 80 / 60℃ sanitary hot water heat medium is generated; the energy station is provided with 1 sanitary hot water plate heat exchanger, which is installed in the water pump house of the energy station; the temperature of the primary side cylinder jacket water is 92 / 84℃, the temperature of the secondary side water is 80 / 60℃, and the maximum heat exchange capacity is about 430kW.

[0066] The water collector and the water distributor play the role of connection and distribution between the flue gas hot water type lithium bromide unit and the original cold and heat source system of the hotel; in the heating hot water process of the energy station, the 60 / 50℃ heating hot water generated by the lithium bromide unit in the heating season is transported after the heating hot water pump of the energy station, and can be reasonably distributed through the water collector and the water distributor and then integrated into the original heating hot water system of the hotel; similarly, in the chilled water process, the 7 / 12℃ air conditioning chilled water generated by the lithium bromide unit in the refrigeration season is transported after the chilled water pump of the energy station, and can also be distributed to the original cold and heat source system of the hotel through the water collector and the water distributor.

[0067] The original cold and heat source system specifically comprises:

[0068] The original hotel and museum adopt a centralized cooling and heating system. The refrigeration room is arranged on the second underground floor, and the gas boiler room is arranged on the first underground floor.

[0069] The air conditioning cold source system is provided with 3 550RT centrifugal water chillers and 1 287RT screw water chiller; the chilled water supply and return water temperature of the air conditioner is 7 / 12℃, which is supplied to the end through the water distributor; the heat source for heating is provided by the gas boiler room on the first underground floor, the heat medium parameter of the cast iron module gas hot water boiler is 95 / 70℃, and 2 plate heat exchangers are arranged in the boiler room to prepare 60 / 50℃ hot water for the air conditioning system; the air conditioning water system is a closed mechanical circulation four-pipe system; the air conditioning chilled water and hot water systems are both primary pump variable flow systems.

[0070] The screw machine chilled water pump, the centrifugal machine chilled water pump and the hot water circulating pump are each provided with 1 variable frequency speed regulation (pressure difference variable frequency) pump, the air conditioning cold and hot water systems are closed mechanical circulation four-pipe systems, the air conditioning chilled water and hot water systems are both primary pump variable flow systems, the screw machine chilled water pump, the centrifugal machine chilled water pump and the hot water circulating pump are each provided with 1 variable frequency speed regulation (pressure difference variable frequency) pump, the air conditioning cold and hot water systems are variable flow systems according to the end load change, and the cold and hot water system soft water treatment device is shared and provided with 1 combined soft water device (continuous water production).

[0071] The air conditioning chilled water system and hot water system are each provided with two CR5-8 make-up water pumps (one in use and one in standby), the pressure setting points of the chilled water and hot water systems are located on the inlet main pipe of the water circulation pump of each water system, and the start and stop of the make-up (pressure setting) water pump is controlled by a YTK-03 pressure controller;

[0072] The hotel sanitary hot water source is provided by a solar collector system and a gas-fired hot water boiler in the boiler room, and the water source is tap water supplied by each region; the boiler room is provided with three 3.5MW hot water boilers; the steam used in the hotel laundry room is provided by a gas-fired steam boiler arranged in the boiler room, and the hotel is currently provided with two (one in use and one in standby) 1.2t / h, 1.0MPa gas-fired steam boilers.

[0073] The lithium bromide unit cooling tower, the flue gas hot water type lithium bromide unit is matched with a square cross-flow type low-noise open cooling tower, the lithium bromide unit cooling tower is installed on the roof above the energy station machine room; the lithium bromide unit cooling tower inlet and outlet temperature is 37 / 32℃, the cooling water treatment capacity is 360m / h, the water loss rate is 0.0014%, the lithium bromide unit cooling tower is matched with two fans, and the lithium bromide unit cooling tower running weight is 5780kg.

[0074] The flue gas denitration unit, in order to make the flue gas meet the relevant emission standards, the energy station is provided with a flue gas denitration unit, the content of nitrogen oxides in the flue gas after denitration treatment is less than 75ppm, and the pressure loss of the flue gas after passing through the denitration equipment is about 1kPa; the flue gas denitration unit is installed in the energy station machine room.

[0075] The heat storage device, in order to fully utilize the heat of the sanitary hot water generated by the energy station, a heat storage water tank is arranged in the hotel refrigeration machine room as a heat storage device.

[0076] The process flow of the energy station combined cooling, heating and power supply includes natural gas supply, gas internal combustion generator power supply, flue gas flow, cylinder jacket water flow, intermediate cold water flow, flue gas hot water type lithium bromide unit cooling water flow, chilled water flow, heating hot water flow, sanitary hot water flow and flue gas denitration treatment flow, and specifically:

[0077] The natural gas supply, the natural gas used by the energy station is introduced from the municipal medium-pressure gas pipe network, reduced in pressure by a pressure regulating box, and then sent to the energy station machine room for use by the gas generator.

[0078] The gas internal combustion generator power supply, the energy station power system follows the principle of power generation and grid connection without power export and self-use; the generator generates power during the peak and flat period of the daily electricity price, i.e. from 7:00 to 23:00 every day, during which period the various energy supply systems of the energy station work.

[0079] The flue gas flow specifically refers to the flue gas flow in the heating / cooling season and the excessive season;

[0080] Heating / cooling season: the high-temperature flue gas generated by the generator set is first subjected to denitration treatment, and then subjected to the flue gas water type lithium bromide unit to prepare heating hot water / air conditioning chilled water; an electric three-way valve is arranged on the flue gas pipeline between the flue gas denitration unit and the flue gas water type lithium bromide unit, and the flue gas amount is adjusted according to the change of the heat load; when the residual heat amount is relatively large or the generator is running and the flue gas water type lithium bromide unit is under maintenance, part or all of the flue gas is directly discharged into the atmosphere through a bypass flue.

[0081] After the high-temperature flue gas passes through the flue gas water type lithium bromide unit, the temperature is reduced to about 110 DEG C, and then the flue gas enters the flue gas water heat exchanger; after heat exchange, the flue gas is condensed, the temperature is reduced to about 70 DEG C, and then discharged into the atmosphere; an electric three-way valve is arranged on the flue gas pipeline between the flue gas water type lithium bromide unit and the flue gas water heat exchanger, and when the flue gas water heat exchanger is under maintenance, the flue gas is discharged into the atmosphere through a bypass flue.

[0082] Transition season: in the transition season, the hotel has no demand for heating hot water or air conditioning chilled water, at this time, the high-temperature flue gas generated by the generator set is subjected to denitration treatment and then enters the flue gas water heat exchanger to prepare sanitary hot water heat medium, and the flue gas after heat exchange is discharged into the atmosphere.

[0083] The cylinder liner water flow is specifically the cylinder liner water flow in the heating / cooling season and the transition season.

[0084] Heating / cooling season: when the system load is high, the high-temperature cylinder liner water enters the flue gas water type lithium bromide unit + heating hot water plate heat exchanger (in winter) / flue gas water type lithium bromide unit (in summer) to prepare heating hot water / air conditioning chilled water.

[0085] When the system load is low, part of the high-temperature cylinder liner water enters the flue gas water type lithium bromide unit + heating hot water plate heat exchanger (in winter) / flue gas water type lithium bromide unit (in summer) to prepare heating hot water / air conditioning chilled water, and part of the high-temperature cylinder liner water enters the sanitary hot water plate heat exchanger to prepare domestic hot water; an electric three-way regulating valve is arranged on the cylinder liner water pipeline between the flue gas water type lithium bromide unit and the sanitary hot water plate heat exchanger, so as to control the cylinder liner water flow entering the flue gas water type lithium bromide unit and the sanitary hot water plate heat exchanger.

[0086] An electric three-way regulating valve is arranged on the pipeline between the cylinder liner water air cooler and the flue gas water type lithium bromide unit and the sanitary hot water plate heat exchanger; when the flue gas water type lithium bromide unit and the sanitary hot water plate heat exchanger cannot be fully utilized or the units are under maintenance, part or all of the cylinder liner water enters the cylinder liner water air cooler to be cooled and cooled, so as to ensure the cylinder liner water return temperature.

[0087] Transition season: In the transition season, high-temperature jacket water enters the sanitary hot water plate heat exchanger to prepare domestic hot water. When the sanitary hot water plate heat exchanger cannot fully utilize the waste heat of the jacket water or the heat exchanger is under maintenance, part or all of the jacket water enters the jacket water air cooler for cooling to ensure the return water temperature of the jacket water.

[0088] The medium cooling water process, the outlet temperature of the medium cooling water generated by the generator set is about 50℃, the water temperature is low and the waste heat is small, only about 42kW, and the cost of utilization is high, so the waste heat is directly discharged through the medium cooling water air cooler matched with the generator set.

[0089] The cooling water process of the flue gas hot water type lithium bromide unit, when the flue gas hot water type lithium bromide unit is working, the cooling water is sent into the roof lithium bromide unit cooling tower by the cooling water pump, and after cooling and heat dissipation, it is returned to the flue gas hot water type lithium bromide unit at 32℃; when the flue gas hot water type lithium bromide unit stops working, the cooling water system stops accordingly.

[0090] The chilled water process, in the refrigeration season, the flue gas hot water type lithium bromide unit generates 7 / 12℃ air conditioning chilled water, which is transported by the energy station chilled water pump and enters the original chilled water system of the hotel; when the air conditioning system is running in the refrigeration season, the automatic control system preferentially ensures the high load operation of the flue gas hot water type lithium bromide unit to supply cooling according to the chilled water supply and return water temperature, and when the cooling capacity is insufficient, the original chiller unit of the hotel is started to supplement.

[0091] The heating hot water process, in the heating season, the flue gas hot water type lithium bromide unit generates 60 / 50℃ heating hot water, which is transported by the energy station heating hot water pump and enters the original heating hot water system of the hotel; when the air conditioning system is running in the heating season, the automatic control system preferentially ensures the high load operation of the flue gas hot water type lithium bromide unit to supply heat according to the heating hot water supply and return water temperature, and when the heating capacity is insufficient, the original heating hot water boiler of the hotel is started to supplement.

[0092] The sanitary hot water process, the sanitary hot water heat medium prepared by the sanitary hot water plate heat exchanger or the flue gas hot water heat exchanger is transported by the energy station sanitary hot water pump and stored in the water tank in the hotel chiller room.

[0093] The flue gas denitration treatment process, the high-temperature flue gas generated by the gas generator first enters the flue gas denitration unit for denitration treatment, and the treated flue gas enters the flue gas hot water type lithium bromide unit or is bypassed to the atmosphere for discharge; the flue gas after being used by the flue gas hot water type lithium bromide unit enters the flue gas hot water heat exchanger for heat exchange or is bypassed to the atmosphere; when the flue gas denitration unit is maintained, the generator stops working; so as to ensure that the flue gas discharged to the atmosphere always meets the emission standard.

[0094] The operation of the energy station combined cooling, heating and power energy control system follows the principle of maximizing waste heat utilization; the energy station energy supply is preferentially utilized, and the original cold and heat source system of the hotel is supplemented when insufficient; three sets of energy station operation schemes for the heating season, the refrigeration season and the transition season are respectively developed, which are specifically:

[0095] With reference to Figure 2 , during the heating season, when the heating system is low load, the high-temperature flue gas and part of the cylinder jacket water generated by the generator enter the flue gas hot water type lithium bromide unit + heating hot water plate heat exchanger to prepare heating hot water; at this time, the heating hot water prepared can meet the heating load demand of the hotel; all or part of the cylinder jacket water generated by the generator enters the sanitary hot water plate heat exchanger to prepare sanitary hot water heat medium; in addition, the insufficient amount of hotel sanitary hot water is supplemented by the domestic hot water prepared by the solar collector system and the gas hot water boiler in the boiler room;

[0096] When the heating system is high load, the high-temperature flue gas and all cylinder jacket water generated by the generator enter the flue gas hot water type lithium bromide unit to prepare heating hot water and the heating hot water plate heat exchanger; the high-temperature flue gas at the outlet of the flue gas hot water type lithium bromide unit enters the flue gas hot water heat exchanger to prepare sanitary hot water heat medium; at this time, the insufficient amount of hotel heating hot water is supplemented by the hot water boiler, and the insufficient amount of sanitary hot water is supplemented by the domestic hot water prepared by the solar collector system and the gas hot water boiler in the boiler room.

[0097] With reference to Figure 3 , during the refrigeration season, when the air conditioning system is low load, the high-temperature flue gas and part of the cylinder jacket water generated by the generator enter the flue gas hot water type lithium bromide unit to prepare air conditioning chilled water; at this time, the cooling capacity of the prepared air conditioning chilled water can meet the cooling load demand of the hotel; all or part of the cylinder jacket water generated by the generator enters the sanitary hot water plate heat exchanger to prepare sanitary hot water heat medium; the high-temperature flue gas at the outlet of the flue gas hot water type lithium bromide unit enters the flue gas hot water heat exchanger to prepare sanitary hot water heat medium; in addition, the insufficient amount of hotel sanitary hot water is supplemented by the domestic hot water prepared by the solar collector system and the gas hot water boiler in the boiler room;

[0098] When the air conditioning system is high load, the high-temperature flue gas and all cylinder jacket water generated by the generator enter the flue gas hot water type lithium bromide unit to prepare air conditioning chilled water; the high-temperature flue gas at the outlet of the flue gas hot water type lithium bromide unit enters the flue gas hot water heat exchanger to prepare sanitary hot water heat medium; at this time, the insufficient amount of hotel air conditioning chilled water is supplemented by the chilled water unit, and the insufficient amount of sanitary hot water is supplemented by the domestic hot water prepared by the solar collector system and the gas hot water boiler in the boiler room.

[0099] With reference to Figure 4, the over season, 7:00~23:00 energy station working period flue gas is handled into flue gas hot water heat exchanger through flue gas denitration unit to prepare sanitary hot water heat medium, and then is discharged into the atmosphere; high temperature cylinder jacket water is prepared into sanitary hot water heat medium through sanitary hot water plate heat exchanger; hotel sanitary hot water shortage is supplemented by solar collector system and boiler room gas hot water boiler prepared life hot water.

[0100] The generator set is automatically synchronized and connected to the grid under the condition of equal voltage, same phase and same frequency, and the system is divided into manual / time control and divided into winter / summer season and three transition season modes (of which transition season 1 and 2 are the same as winter / summer season operation mode).

[0101] The generator starting is divided into remote / manual state, and the starting is set to 200KW in manual state, and is adjusted to 800KW after the generator is synchronized and connected to the grid stably (note that since the load of the hotel party can consume more than 800KW of electricity, the rest is supplemented by the city power, and the power is not allowed to be connected to the city power grid), and the starting power of the generator is set in the remote state, and the real-time power of the hotel power distribution room is calculated to adjust the power generation of the generator (the same is not allowed to be higher than the actual use of the hotel).

[0102] The flue gas hot water type lithium bromide unit interlocks the generator operation, preferentially starts the cold and hot circulating pump, automatically adjusts the cooling tower through temperature, sets the outlet water temperature to 7℃ in summer / 60℃ in winter (maximizes the use of the energy station system), and under the condition of meeting the demand, adjusts the hotel cold machine temperature or stops the machine, reduces the circulating pump frequency of the hotel party, and maximizes the use of the energy station energy supply.

[0103] The energy station energy supply uses 2887.3M3 of natural gas; the power generation is 10740KWH (total daily power generation of the generator); the hotel generator power is 9544.8KWH; the energy station power consumption is 1212KWH (city power consumption+generator power generation); the refrigeration capacity is 40GJ; and the water consumption is 24.94t.

[0104] The above only describes preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments. Any technical solution under the idea of the present application belongs to the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.​

Claims

1. A natural gas combined cooling, heating and power energy control system, characterized in that, It includes an energy supply module, a waste heat utilization module, a cooling and auxiliary module, and an energy control and monitoring module; The energy supply module includes an energy station generator set and a natural gas supply unit; The waste heat utilization unit includes a flue gas hot water type lithium bromide unit, a heating hot water plate heat exchanger, a flue gas hot water heat exchanger, a domestic hot water plate heat exchanger, a water collector, and a water distributor. The cooling and auxiliary module includes a lithium bromide unit cooling tower, a flue gas denitrification unit, and a heat storage device; the energy control and monitoring module includes a control system and a monitoring system. The energy station generator set is a gas-fired internal combustion generator set, and the waste heat generated after the generator set generates electricity includes high-temperature flue gas and high-temperature cylinder liner water. The generator set is equipped with auxiliary equipment including a generator soundproof enclosure, generator intake and exhaust fans, generator intake and exhaust silencers, a heptafluoropropane gas fire extinguishing system, cylinder liner water diaphragm expansion tank, intercooling water diaphragm expansion tank, cylinder liner water pump, cylinder liner water air cooler, intercooling water pump, intercooling water air cooler, primary and secondary flue gas silencers, generator fuel replenishment system, auxiliary power distribution cabinet, and grid connection control cabinet. The natural gas supply unit is responsible for introducing natural gas from the municipal medium-pressure gas pipeline network, regulating its pressure, and then delivering it to the generator set; The generator soundproof enclosure is equipped with a gas fire extinguishing system; the generator's intake and exhaust fans are both located inside the supply and exhaust ducts within the soundproof enclosure; the generator's intake and exhaust silencers are respectively installed on the generator's intake and exhaust ducts; the cylinder cabinet for the heptafluoropropane gas fire extinguishing system is located nearby outside the soundproof enclosure; the cylinder liner water pump is installed in the energy station's pump room; the cylinder liner water-air cooler is installed on the roof of the energy station's generator room; the intercooled water pump is installed in the energy station's pump room; the intercooled water-air cooler is installed on the roof of the energy station's generator room; the primary and secondary flue gas silencers are installed on the generator's exhaust ducts; the generator's fuel replenishment system is located nearby outside the soundproof enclosure; the auxiliary power distribution cabinet and grid connection control cabinet are installed in the energy station's control room. The flue gas hot water type lithium bromide generator unit is installed in the power station's machine room; the heating hot water plate heat exchanger is installed next to the power station's flue gas turbine; the flue gas hot water heat exchanger is installed in the power station's machine room; the sanitary hot water plate heat exchanger is installed in the power station's pump room; the water collector and water distributor are respectively connected to the flue gas hot water type lithium bromide generator unit. The lithium bromide unit cooling station is installed on the roof above the energy station's machine room; the flue gas denitrification unit is installed inside the energy station's machine room; and the heat storage device is located inside the hotel's refrigeration room. The control system can realize manual / time control, with winter / summer and three transitional season modes, and the generator start-up can be divided into remote / manual modes, and the power generation can be adjusted according to different modes; the monitoring system can monitor many parameters inside the generator set, the operating status of the flue gas hot water type lithium bromide unit, various flow rates, heat, temperature and energy consumption in the system, and generate data reports.

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