CN113847753A - Natural gas cold and heat cogeneration system - Google Patents
Natural gas cold and heat cogeneration system Download PDFInfo
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- CN113847753A CN113847753A CN202110969707.3A CN202110969707A CN113847753A CN 113847753 A CN113847753 A CN 113847753A CN 202110969707 A CN202110969707 A CN 202110969707A CN 113847753 A CN113847753 A CN 113847753A
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- heat
- heating evaporator
- cooling unit
- exchange device
- heat exchange
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000003345 natural gas Substances 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 152
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000001816 cooling Methods 0.000 claims abstract description 98
- 238000005057 refrigeration Methods 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000007864 aqueous solution Substances 0.000 claims description 68
- 238000010521 absorption reaction Methods 0.000 claims description 62
- 239000000243 solution Substances 0.000 claims description 22
- 238000004378 air conditioning Methods 0.000 abstract description 12
- 239000000779 smoke Substances 0.000 abstract description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 122
- 239000002609 medium Substances 0.000 description 14
- 239000012736 aqueous medium Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
Abstract
The invention discloses a natural gas cold and heat cogeneration system which comprises a heat engine, a transfer unit, a cooling unit and a hot water system unit, wherein the transfer unit is respectively connected with an output shaft of the heat engine and an input end of the cooling unit, the heat engine is connected with an input end of the hot water system unit, the transfer unit transmits mechanical energy output by the heat engine to the cooling unit for refrigeration of the cooling unit, and flue gas generated by the heat engine is transmitted to the hot water system unit for heating of the hot water system unit. The invention generates mechanical energy by the heat engine, supplies the mechanical energy to the cooling unit for refrigeration by the aid of the transfer unit, and heats the smoke heat generated by the heat engine to the hot water supply system unit at the same time, so that the external cold water is refrigerated and heated by the hot water system unit at the same time, the cold and heat co-production is realized, the utilization rate of the heat engine is fully improved, and simultaneously, the energy can be distributed to the air-conditioning refrigeration and hot water system to meet the requirements of people on domestic hot water and air-conditioning refrigeration.
Description
Technical Field
The invention relates to the technical field of natural gas, in particular to a natural gas cold and heat cogeneration system.
Background
The existing heat engine is generally wide in air-conditioning refrigeration application, but is less in hot water system use, however, the temperature is cold in winter, the load of the indoor required hot water system is large, but the demand for air-conditioning refrigeration is not high, and because a large amount of internal energy of the heat engine is dissipated in the form of heat when the heat engine does work, the utilization efficiency of the heat engine is not high, how to improve the utilization rate of the heat engine and better distribute the energy generated by the heat engine to the air-conditioning refrigeration and hot water system so as to meet the demands of people for life hot water all the year round and air-conditioning refrigeration load in summer are the problems that need to be solved.
Thus, there is still a need for improvement and development of the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a natural gas cold and heat cogeneration system aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a natural gas combined heat and cold production system, the system includes heat engine, transfer unit, cooling unit and hot water system unit, the transfer unit is connected with heat engine's output shaft and cooling unit's input respectively, heat engine is connected with the input of hot water system unit, the transfer unit will the mechanical energy of heat engine output transmit to the cooling unit is in order to supply the cooling unit refrigeration, the flue gas that heat engine produced transmit to the hot water system unit heats with hot water supply system unit.
In this embodiment, the hot water system unit includes a first heat exchanger, and external cold water passes through the first heat exchanger to absorb heat of flue gas and then is converted into domestic hot water.
In this embodiment, the system further includes a thermal cooling unit, the thermal cooling unit is connected with the heat engine and the cooling unit respectively, the flue gas generated by the heat engine is transmitted to the thermal cooling unit, the cylinder liner water of the heat engine and the thermal cooling unit form a heat exchange loop, and an external water source sequentially flows through the thermal cooling unit and the cooling unit and flows from the cooling unit to the outside to complete refrigeration.
In this embodiment, the flue gas generated by the heat engine is transmitted to the outside through the hot water system unit after passing through the hot cooling unit.
In this embodiment, the thermal cooling unit includes an absorption mixer, a first heating evaporator, a second heat exchanger, a first flow control valve, and a third heating evaporator, and the absorption mixer, the first heating evaporator, and the second heating evaporator are connected in sequence to form a first medium aqueous solution circulation loop; and the first medium aqueous solution in the second heating evaporator and the water vapor generated by the first medium aqueous solution in the first heating evaporator sequentially flow through the second heat exchanger, the first flow control valve and the third heating evaporator and then flow into the absorption mixer to be absorbed by the first medium aqueous solution in the absorption mixer.
In this embodiment, the thermal cooling unit further includes a first heat exchange device, the first heat exchange device is respectively connected to the first heating evaporator, the second heating evaporator and the absorption mixer, the first aqueous medium solution in the first heating evaporator is transmitted to the second heating evaporator through the first heat exchange device, and the aqueous medium solution in the second heating evaporator is transmitted to the absorption mixer through the first heat exchange device.
In this embodiment, the thermal cooling unit further includes a second heat exchange device, the second heat exchange device is respectively connected to the first heat exchange device, the absorption mixer and the first heating evaporator, the first heat exchange device transfers the first aqueous medium solution in the second heating evaporator to the absorption mixer through the second heat exchange device, and the first aqueous medium solution in the absorption mixer is transferred to the first heating evaporator through the second heat exchange device.
In this embodiment, the thermal cooling unit further includes a third heat exchange device, the third heat exchange device is respectively connected to the absorption mixer, the second heating evaporator and the second heat exchanger, the water vapor generated by the second heating evaporator is transmitted to the second heat exchanger through the third heat exchange device, the third heat exchange device is connected in parallel with the second heat exchange device, a part of the first medium aqueous solution of the absorption mixer is transmitted to the first heating evaporator through the third heat exchange device, and a part of the first medium aqueous solution is transmitted to the first heating evaporator through the second heat exchange device.
In this embodiment, the cooling unit includes a high-pressure driving machine, a third heat exchanger, a second flow control valve, and a fourth heating evaporator, the high-pressure driving machine is connected with the transfer unit, the third heat exchanger, the second flow control valve, the fourth heating evaporator, and the high-pressure driving machine are connected in sequence, and the third heat exchanger, the second flow control valve, the fourth heating evaporator, and the high-pressure driving machine form a second medium refrigeration cycle circuit.
In this embodiment, the transmission unit comprises a first gear and a second gear, the output shaft of the heat engine is connected to the first gear, the first gear is meshed with the second gear, and the second gear is connected to the input end of the high-pressure driver.
Has the advantages that: compared with the prior art, the invention supplies mechanical energy generated by the heat engine to the cooling unit for refrigeration by means of the transfer unit, and simultaneously heats heat of smoke generated by the heat engine to the hot water supply system unit, so that the external cold water is refrigerated and simultaneously heated by the hot water system unit, the cold and heat co-production is realized, the utilization rate of the heat engine is fully improved, and simultaneously, the energy can be distributed to the air-conditioning refrigeration and hot water system to simultaneously meet the requirements of people on domestic hot water and air-conditioning refrigeration.
Drawings
Fig. 1 is a schematic structural diagram of a natural gas combined heat and cold production system provided by the invention.
Fig. 2 is a schematic structural diagram of a hot water system unit in the natural gas combined heat and cold production system provided by the present invention.
Fig. 3 is a schematic structural diagram of a cooling unit in the natural gas combined heat and cold production system provided by the invention.
Fig. 4 is a schematic structural diagram of a heat cooling unit in the natural gas combined heat and cold production system provided by the present invention.
Fig. 5 is a schematic structural diagram of a natural gas combined heat and cold production system provided by the invention.
Detailed Description
The invention provides a natural gas cold and heat cogeneration system, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention will be further explained by the description of the embodiments with reference to the drawings.
The present embodiment provides a natural gas cooling and heating cogeneration system, as shown in fig. 1 to 5, the system includes a heat engine 11, a transfer unit 51, a cooling unit and a hot water system unit, the transfer unit 51 is respectively connected with an output shaft of the heat engine 11 and an input end of the cooling unit, the heat engine 11 is connected with an input end of the hot water system unit, the transfer unit 51 transmits mechanical energy output by the heat engine 11 to the cooling unit for cooling by the cooling unit, flue gas generated by the heat engine 11 is transmitted to the hot water system unit for heating the hot water system unit, the present invention heats heat of the flue gas generated by the heat engine 11 by the transfer unit 51 while supplying cooling to the cooling unit by the mechanical energy generated by the heat engine 11, so as to heat external cold water by the hot water system unit while cooling the external cold water, the combined cooling and heating is realized, the utilization rate of the heat engine 11 is fully improved, and meanwhile, the energy can be distributed to an air-conditioning refrigeration and hot water system to meet the requirements of people on domestic hot water and air-conditioning refrigeration.
In one implementation manner of the present embodiment, the hot water system unit includes a first heat exchanger 21, and after the external cold water passes through the first heat exchanger 21, the external cold water absorbs heat of high-temperature flue gas generated by the heat engine 11 in the first heat exchanger 21 and is converted into domestic hot water for people to use.
In one implementation manner of this embodiment, the system further includes a thermal cooling unit, the thermal cooling unit is connected to the heat engine 11, a cylinder liner water of the heat engine 11 and the thermal cooling unit form a heat exchange loop, and high-temperature flue gas generated by the heat engine 11 is transmitted to the thermal cooling unit to provide heat for the thermal cooling unit. Because the temperature of the flue gas generated by the heat engine 11 is very high, and the temperature of the heat required by the hot water system unit is relatively low, in order to improve the utilization rate of the energy generated by the heat engine 11, the flue gas generated by the heat engine 11 firstly passes through the heat cooling unit and then supplies heat to the external cold water in the first heat exchanger 21, the external cold water absorbs the energy of the flue gas generated by the heat engine 11 and then becomes domestic hot water, and after the heat of the flue gas generated by the heat engine 11 is fully utilized, the flue gas is finally discharged to the outside through the first heat exchanger 21. In this embodiment, the thermal cooling unit is further connected to the cooling unit, the thermal cooling unit and the cooling unit form a coupled cooling path, wherein the cooling unit is a main cooling unit, the external water source completes the first cooling through the thermal cooling unit, the external water source after the first cooling completes the second cooling through the cooling unit, for example, if the temperature of the external water source after passing through the thermal cooling unit is 14 ℃, the temperature of the external water source after passing through the thermal cooling unit is 12 ℃, and the temperature of the external water source after passing through the thermal cooling unit is 7 ℃ when the external water source is continuously introduced into the cooling unit and then is output to the outside, such that the external water source is cooled stepwise according to the temperature difference formed by the thermal cooling unit and the cooling unit, and the cooling efficiency is improved.
In one implementation manner of the present embodiment, the thermal cooling unit includes an absorption mixer 41, a first heating evaporator 42, a second heating evaporator 43, a second heat exchanger 44, a first flow control valve, and a third heating evaporator 45, and the absorption mixer 41, the first heating evaporator 42, and the second heating evaporator 43 are connected in sequence and form a second medium aqueous solution circulation loop; the second aqueous medium solution in the second heating evaporator 43 and the water vapor generated by the second aqueous medium solution in the first heating evaporator 42 sequentially flow through the second heat exchanger 44, the first flow control valve and the third heating evaporator 45, and then flow into the absorption mixer 41 to be absorbed by the second aqueous medium solution in the absorption mixer 41; wherein, the second medium aqueous solution is a lithium bromide aqueous solution, the lithium bromide is a solute, the water is a solvent, solution pumps are arranged between the absorption mixer 41 and the first heating evaporator 42 and between the first heating evaporator 42 and the second heating evaporator 43, a throttle pump is arranged between the second heating evaporator 43 and the absorption mixer 41, the lithium bromide aqueous solution in the absorption mixer 41 is transmitted to the first heating evaporator 42 through the solution pumps, the lithium bromide aqueous solution in the first heating evaporator 42 is heated by the cylinder liner water of the heat engine 11, the water solvent in the lithium bromide aqueous solution in the first heating evaporator 42 forms water vapor and increases the concentration of the lithium bromide aqueous solution, the water vapor flows into the second heat exchanger 44, the lithium bromide aqueous solution evaporated in the first heating evaporator 42 is transmitted to the second heating evaporator 43 through the solution pumps, after the lithium bromide aqueous solution in the second heating evaporator 43 is heated by the high-temperature flue gas of the heat engine 11, the water solvent in the lithium bromide aqueous solution in the second heating evaporator 43 forms water vapor, the water vapor flows into the second heat exchanger 44 after passing through the first heating evaporator 42, and the evaporated lithium bromide aqueous solution in the second heating evaporator 43 flows back into the absorption mixer 41 through the throttle pump. Further, the concentration of the lithium bromide aqueous solution of the second heating evaporator 43 is larger than that of the first heating evaporator 42, and the concentration of the lithium bromide aqueous solution of the first heating evaporator 42 is larger than that of the absorption mixer 41; the water vapor generated by the first heating evaporator 42 and the second heating evaporator 43 is evaporated into the second heat exchanger 44 through the first input end and the second input end of the second heat exchanger 44, and is condensed after being cooled by the cooling water in the second heat exchanger 44 to become high-temperature low-pressure liquid water, when the water in the second heat exchanger 44 enters the third heating evaporator 45 through the first flow control valve, the water is rapidly expanded and vaporized, and absorbs a large amount of heat of an external water source in the third heating evaporator 45 in the vaporization process, so as to achieve the purpose of cooling and refrigerating, the low-temperature water vapor in the third heating evaporator 45 enters the absorption mixer 41 and is absorbed by the lithium bromide aqueous solution in the absorption mixer 41, so that the lithium bromide aqueous solution loop forms a lithium bromide aqueous solution circulation loop.
In one implementation manner of this embodiment, the thermal cooling unit further includes a first heat exchange device 46, the first heat exchange device 46 is respectively connected to the first heating evaporator 42, the second heating evaporator 43, and the absorption mixer 41, the lithium bromide aqueous solution in the first heating evaporator 42 is transmitted to the second heating evaporator 43 through the first heat exchange device 46, the lithium bromide aqueous solution in the second heating evaporator 43 is transmitted to the absorption mixer 41 through the first heat exchange device 46, wherein the second heating evaporator 43 is connected to a high-temperature flue gas output end of the heat engine 11, and the second heating evaporator 43 is connected to the first heat exchanger 21, in this embodiment, the high-temperature flue gas generated by the heat engine 11 may be 550 ℃, and the cylinder liner water may be 90 ℃; the heat engine 11 leads the generated flue gas with the temperature of 550 ℃ into the second heating evaporator 43, the temperature of the flue gas is 160 ℃, after the second heating evaporator 43 transmits the temperature of 160 ℃ to the first heat exchanger 21, the temperature of the flue gas is 100 ℃, the flue gas with the temperature of 100 ℃ is discharged to the outside through the first heat exchanger 21, the first heating evaporator 42 is connected with the water output end of the cylinder sleeve, while the absorption mixer 41 is not connected to the heat engine 11, the temperature of the high-temperature flue gas is higher than that of the cylinder liner water, as can be seen from the above, the high-temperature flue gas in the embodiment can be 550 ℃, the cylinder liner water can be 90 ℃, and based on the knowledge, the temperature of the lithium bromide aqueous solution in the second heating evaporator 43 is higher than that of the lithium bromide aqueous solution in the first heating evaporator 42, the temperature of the lithium bromide aqueous solution in the first heating evaporator 42 is higher than the temperature of the lithium bromide aqueous solution in the absorption mixer 41. Therefore, before the lower-temperature lithium bromide aqueous solution in the first heating evaporator 42 is transferred to the second heating evaporator 43, the lower-temperature lithium bromide aqueous solution which is about to enter the second heating evaporator 43 is subjected to heat exchange with the highest-temperature lithium bromide aqueous solution which is transferred from the second heating evaporator 43 to the absorption mixer 41 by the first heat exchange device 46 by using the first heat exchange device 46, so that the temperature of the lithium bromide aqueous solution which enters the second heating evaporator 43 from the first heating evaporator 42 is increased, the temperature difference of the lithium bromide aqueous solution which enters the second heating evaporator 43 is reduced, and the mixing efficiency of the lithium bromide aqueous solution in the second heating evaporator 43 is improved; meanwhile, the temperature of the lithium bromide aqueous solution entering the absorption mixer 41 from the second heating evaporator 43 is also reduced, and the temperature difference of the lithium bromide aqueous solution entering the absorption mixer 41 is further reduced, so that the mixing efficiency of the lithium bromide aqueous solution in the absorption mixer 41 is improved.
In one implementation of this embodiment, the thermal cooling unit further includes a second heat exchange device 47, the second heat exchange device 47 is respectively connected to the first heat exchange device 46, the absorption mixer 41 and the first heating evaporator 42, the first heat exchange device 46 transfers the lithium bromide aqueous solution in the second heating evaporator 43 to the absorption mixer 41 through the second heat exchange device 47, and the lithium bromide aqueous solution in the absorption mixer 41 is transferred to the first heating evaporator 42 through the second heat exchange device 47. On the basis that the lithium bromide aqueous solution with the highest temperature in the second heating evaporator 43 is subjected to heat exchange through the first heat exchange device 46 and then is conveyed to the absorption mixer 41, because the temperature of the lithium bromide aqueous solution in the second heating evaporator 43 is far greater than that of the lithium bromide aqueous solution in the absorption mixer 41, the temperature of the lithium bromide aqueous solution with the highest temperature in the second heating evaporator 43 conveyed to the absorption mixer 41 through the first heat exchange device 46 is higher than that of the lithium bromide aqueous solution in the first heating evaporator 42, and the reaction between the aqueous solvent and the lithium bromide solute is carried out in the absorption mixer 41, in order to better promote water vapor to enter the absorption mixer 41 and be fully absorbed by the lithium bromide aqueous solution in the absorption mixer 41 so as to form a lithium bromide aqueous solution circulation loop, the lithium bromide aqueous solution with the highest temperature in the second heating evaporator 43 is subjected to heat exchange through the first heat exchange device 46 to obtain a higher temperature Before the first heat exchange device 46 transfers the lithium bromide aqueous solution with higher temperature to the absorption mixer 41, the lithium bromide aqueous solution with higher temperature passes through the second heat exchange device 47, and the second heat exchange device 47 is used for carrying out heat exchange between the lithium bromide aqueous solution with lower temperature which is about to enter the absorption mixer 41 and the lithium bromide aqueous solution with lowest temperature which is transferred from the absorption mixer 41 to the first heating evaporator 42, so that the process not only reduces the temperature of the lithium bromide aqueous solution which enters the absorption mixer 41 from the first heat exchange device 46, but also reduces the temperature difference of the lithium bromide aqueous solution which enters the absorption mixer 41, thereby improving the mixing efficiency of the lithium bromide aqueous solution in the absorption mixer 41; meanwhile, the temperature of the lithium bromide aqueous solution entering the first heating evaporator 42 from the absorption mixer 41 is also increased, and the temperature difference of the lithium bromide aqueous solution entering the first heating evaporator 42 is further reduced, so that the mixing efficiency of the lithium bromide aqueous solution in the first heating evaporator 42 is improved. Furthermore, in all embodiments, the temperature words are adjective highest > higher > lower > next lowest > lowest.
In one implementation of this embodiment, the thermal cooling unit further includes a third heat exchange device 48, the third heat exchange device 48 is respectively connected to the absorption mixer 41, the second heating evaporator 43 and the second heat exchanger 44, the water vapor generated by the second heating evaporator 43 is transmitted to the second heat exchanger 44 through the third heat exchange device 48, the third heat exchange device 48 is connected in parallel with the second heat exchange device 47, the second medium aqueous solution of the absorption mixer 41 is partially transmitted to the first heating evaporator 42 through the third heat exchange device 48, and partially transmitted to the first heating evaporator 42 through the second heat exchanger 44. In order to fully utilize the temperature of the water vapor generated after the lithium bromide water solution in the second heating evaporator 43 is heated by the high-temperature flue gas at 550 ℃ of the heat engine, the water vapor in the second heating evaporator 43 firstly passes through the first heating evaporator 42 and gives a certain amount of heat to the first heating evaporator 42 to promote the evaporation yield of the water solvent of the lithium bromide water solution in the first heating evaporator 42, the supply rate of the refrigerant in the lithium bromide water solution circulation loop is improved, thereby the refrigeration efficiency of the lithium bromide water solution circulation loop is improved, in addition, because the temperature of the water vapor in the second heating evaporator 43 after passing through the first heating evaporator 42 is higher than the lowest temperature of the lithium bromide water solution in the first heating evaporator 42 transmitted by the absorption mixer 41, therefore, before the high-temperature water vapor in the second heating evaporator 43 is transmitted to the second heat exchanger 44 by the first heating evaporator 42, the higher temperature water vapor entering the second heat exchanger 44 is heat exchanged with the lowest temperature lithium bromide aqueous solution transferred from the absorption mixer 41 to the first heating evaporator 42 by the third heat exchange device 48, which not only reduces the temperature of the water vapor entering the second heat exchanger 44 from the first heating evaporator 42, reduces the usage of cooling water of the second heat exchanger 44, greatly improves the heat utilization rate of the water vapor in the second heating evaporator 43, promotes the utilization rate of energy, but also further improves the temperature of the lithium bromide aqueous solution entering the first heating evaporator 42 from the absorption mixer 41, further reduces the temperature difference of the lithium bromide aqueous solution entering the first heating evaporator 42, so as to further improve the mixing efficiency of the lithium bromide aqueous solution in the first heating evaporator 42, that is, the provision of both the second heat exchange device 47 and the third heat exchange device 48 promotes the mixing efficiency of the lithium bromide aqueous solution in the first heating evaporator 42.
In one implementation manner of this embodiment, the cooling unit includes a high-pressure driver 31, a third heat exchanger 32, a second flow control valve, and a fourth heating evaporator 33, the third heat exchanger 32, the second flow control valve, the fourth heating evaporator 33, and the high-pressure driver 31 are sequentially connected, the third heat exchanger 32, the second flow control valve, the fourth heating evaporator 33, and the high-pressure driver 31 form a first medium refrigeration cycle, wherein the first medium may be tetrafluoroethane, in the tetrafluoroethane refrigeration cycle, the high-pressure driver 31 converts tetrafluoroethane into high-temperature high-pressure gas, the high-temperature high-pressure gas is cooled by cooling water in the third heat exchanger 32 after passing through the third heat exchanger 32 and then condensed into a high-temperature low-pressure liquid form, and when the liquid form tetrafluoroethane in the third heat exchanger 32 enters the fourth heating evaporator 33 through the second flow control valve, the refrigerant is rapidly expanded and vaporized, and absorbs a large amount of heat of an external water source in the fourth heating evaporator 33 in the vaporization process to achieve the purpose of temperature reduction and refrigeration, and the low-temperature vapor R134 in the fourth heating evaporator 33 returns to the high-pressure driver 31 to form a second medium refrigeration cycle loop. The third heating evaporator 45 is connected with the fourth heating evaporator 33, an external water source firstly flows in from the third heating evaporator 45, the external water source passes through the third heating evaporator 45 and finishes first refrigeration, then flows into the fourth heating evaporator 33 through the third heating evaporator 45, finishes second refrigeration in the fourth heating evaporator 33, and finally flows out of the fourth heating evaporator 33, thus a coupling type refrigeration passage is formed by a heat cooling unit in the third heating evaporator 45 and a cooling unit in the fourth heating evaporator 33, the external water source can well perform stepped cooling through the coupling type refrigeration passage, and the refrigeration efficiency is improved.
In one implementation of the present embodiment, the transmission unit 51 includes a first gear and a second gear, the output shaft of the heat engine 11 is connected to the first gear, the first gear is meshed with the second gear, and the second gear is connected to the input end of the high-pressure driver 31. The heat engine 11 converts the heat energy into mechanical energy to drive the output shaft of the heat engine 11 to rotate, and further drives the first gear connected to the output shaft of the heat engine 11 to rotate, the first gear drives the second gear to rotate, so that the mechanical energy generated by the heat engine 11 is transmitted to the high-pressure driver 31 through the second gear, and the high-pressure driver 31 is driven to compress the first medium flowing into the high-pressure driver. Since the first gear is connected to the output shaft of the heat engine 11 and the second gear is connected to the input end of the high-pressure driver 31, in order to improve the working efficiency of the high-pressure driver 31, in this embodiment, the number of teeth of the first gear is less than the number of teeth of the second gear, after the rotational speed of the output shaft of the heat engine 11 passes through the first gear and the second gear, because the number of teeth of the second gear is less than the number of teeth of the first gear and the second gear is engaged with the first gear, so that the rotational speed of the second gear is greater than the rotational speeds of the first gear and the output shaft of the heat engine 11, the rotational speed of the input end of the high-pressure driver 31 connected with the second gear can be improved to improve the working efficiency of the high-pressure driver 31, to reduce the occupied space of the transmission unit 51 and to ensure the safety of the operation of the transmission unit 51, the first gear and the second gear may be disposed in a gear box, in which the pinions with different tooth numbers are engaged and the difference in tooth number between adjacent engaged gears is increased, so as to sufficiently increase the gear rotation speed to improve the operating efficiency of the high-pressure driver 31, wherein the first gear is also connected to the output shaft of the heat engine 11, the second gear is also connected to the input end of the high-pressure driver 31, and the first gear may be engaged with the second gear through an intermediate gear.
In summary, the present embodiment provides a natural gas cooling and heating cogeneration system, the system includes a heat engine 11, a transfer unit 51, a cooling unit and a hot water system unit, the transfer unit 51 is respectively connected to an output shaft of the heat engine 11 and an input end of the cooling unit, the heat engine 11 is connected to an input end of the hot water system unit, the transfer unit 51 transmits mechanical energy output by the heat engine 11 to the cooling unit for cooling by the cooling unit, and flue gas generated by the heat engine 11 is transmitted to the hot water system unit for heating by the hot water system unit, the present invention heats heat of flue gas generated by the heat engine 11 by the transfer unit 51 while supplying cooling to the cooling unit, so as to heat external cold water by the hot water system unit while cooling external cold water, the combined cooling and heating is realized, the utilization rate of the heat engine 11 is fully improved, and meanwhile, the energy can be distributed to an air-conditioning refrigeration and hot water system to meet the requirements of people on domestic hot water and air-conditioning refrigeration.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The natural gas cold and heat cogeneration system is characterized by comprising a heat engine, a transfer unit, a cooling unit and a hot water system unit, wherein the transfer unit is respectively connected with an output shaft of the heat engine and an input end of the cooling unit, the heat engine is connected with an input end of the hot water system unit, the transfer unit transmits mechanical energy output by the heat engine to the cooling unit for refrigeration of the cooling unit, and flue gas generated by the heat engine is transmitted to the hot water system unit for heating of the hot water system unit.
2. The natural gas combined heat and cold production system according to claim 1, wherein the hot water system unit comprises a first heat exchanger, and external cold water is converted into domestic hot water after absorbing heat of flue gas through the first heat exchanger.
3. The natural gas cold and heat cogeneration system according to claim 1, further comprising a heat cooling unit, wherein the heat cooling unit is respectively connected with a heat engine and a cooling unit, flue gas generated by the heat engine is transmitted to the heat cooling unit, cylinder liner water of the heat engine and the heat cooling unit form a heat exchange loop, and an external water source sequentially flows through the heat cooling unit and the cooling unit and flows from the cooling unit to the outside to complete refrigeration.
4. The natural gas combined heat and cold production system as claimed in claim 3, wherein the flue gas generated by the heat engine is transmitted to the outside through the hot water system unit after passing through the hot cooling unit.
5. The natural gas combined heat and cold production system according to claim 3, wherein the heat cooling unit comprises an absorption mixer, a first heating evaporator, a second heat exchanger, a first flow control valve and a third heating evaporator, and the absorption mixer, the first heating evaporator and the second heating evaporator are sequentially connected to form a first medium aqueous solution circulation loop; and the first medium aqueous solution in the second heating evaporator and the water vapor generated by the first medium aqueous solution in the first heating evaporator sequentially flow through the second heat exchanger, the first flow control valve and the third heating evaporator and then flow into the absorption mixer to be absorbed by the first medium aqueous solution in the absorption mixer.
6. The natural gas combined heat and cold production system according to claim 5, wherein the heat cooling unit further comprises a first heat exchange device, the first heat exchange device is respectively connected with a first heating evaporator, a second heating evaporator and an absorption mixer, the first medium water solution in the first heating evaporator is transmitted to the second heating evaporator through the first heat exchange device, and the medium water solution in the second heating evaporator is transmitted to the absorption mixer through the first heat exchange device.
7. The natural gas combined heat and cold production system according to claim 6, wherein the heat cooling unit further comprises a second heat exchange device, the second heat exchange device is respectively connected with the first heat exchange device, the absorption mixer and the first heating evaporator, the first heat exchange device transfers the first medium water solution in the second heating evaporator to the absorption mixer through the second heat exchange device, and the first medium water solution in the absorption mixer is transferred to the first heating evaporator through the second heat exchange device.
8. The natural gas combined heat and cold production system according to claim 7, wherein the heat cooling unit further comprises a third heat exchange device, the third heat exchange device is respectively connected with the absorption mixer, the second heating evaporator and the second heat exchanger, the water vapor generated by the second heating evaporator is transmitted to the second heat exchanger through the third heat exchange device, the third heat exchange device is connected with the second heat exchange device in parallel, the first medium aqueous solution of the absorption mixer is partially transmitted to the first heating evaporator through the third heat exchange device, and partially transmitted to the first heating evaporator through the second heat exchange device.
9. The natural gas combined heat and cold production system according to claim 1, wherein the cooling unit comprises a high-pressure driving machine, a third heat exchanger, a second flow control valve and a fourth heating evaporator, the high-pressure driving machine is connected with the transfer unit, the third heat exchanger, the second flow control valve, the fourth heating evaporator and the high-pressure driving machine are sequentially connected, and the third heat exchanger, the second flow control valve, the fourth heating evaporator and the high-pressure driving machine form a second medium refrigeration cycle loop.
10. The natural gas combined heat and cold production system according to claim 1, wherein the transfer unit comprises a first gear and a second gear, the output shaft of the heat engine is connected with the first gear, the first gear is meshed with the second gear, and the second gear is connected with the input end of the high-pressure driving machine.
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