CN215057620U - Combined heat and power system based on screw expander and organic Rankine cycle - Google Patents
Combined heat and power system based on screw expander and organic Rankine cycle Download PDFInfo
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- CN215057620U CN215057620U CN202120602971.9U CN202120602971U CN215057620U CN 215057620 U CN215057620 U CN 215057620U CN 202120602971 U CN202120602971 U CN 202120602971U CN 215057620 U CN215057620 U CN 215057620U
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Abstract
The utility model belongs to the technical field of the cogeneration, especially, relate to a cogeneration system based on screw expander and organic rankine cycle. The combined heat and power system comprises a deaerator, a boiler, a steam distributing cylinder, a working medium evaporator, a screw expander, a working medium condenser, a working medium circulating pump and a steam-water heat exchanger, wherein the boiler comprises a coal economizer, a boiler evaporator and a steam drum which are sequentially connected, all steam supplied by the steam drum enters the working medium evaporator for heat exchange, liquid organic working media in the working medium evaporator are heated to generate gaseous organic working media, the gaseous organic working media enter the screw expander for work, exhaust steam after the gaseous organic working media enter the screw expander for work enters the working medium condenser to be condensed into the liquid organic working media, the condensed liquid organic working media enter the working medium circulating pump, and the exhaust steam enters the working medium evaporator after being boosted by the working medium circulating pump to complete organic Rankine cycle. Therefore, the utilization rate of energy is improved, and the emission of carbon, sulfur and nitrogen oxides is reduced.
Description
Technical Field
The utility model belongs to the technical field of the cogeneration, especially, relate to a cogeneration system based on screw expander and organic rankine cycle.
Background
The current situation of primary energy in China is not optimistic, although the reserves of coal resources are ranked second in the world, the coal resources which can be exploited in China are less than one hundred years, the petroleum and natural gas resources in China are exploited for only dozens of years, and the petroleum exploitation in the world is possibly in short supply in the century.
With the continuous promotion of industrial energy-saving work in China, middle and high grade industrial heat energy is effectively utilized at present, and in high energy consumption industries such as ferrous metallurgy, nonferrous metals, building materials, papermaking, cement, ceramics, glass, food, petrifaction, petrochemical industry, electric power and the like, pressurized steam and a large number of heat sources such as gas (process gas, steam, flue gas), hot water and the like can be generated by utilizing an industrial boiler, and the part of heat cannot meet the requirements due to low energy grade because of the traditional utilization method, is generally not fully utilized, so that a large amount of energy waste is caused, and the environmental pollution is aggravated. Especially, when an industrial boiler supplies heat to a heat user, a large amount of saturated steam can be generated, and the saturated steam is used for directly supplying heat, so that not only can huge waste of energy be caused, but also heat pollution can be caused to the environment. And the steam that industrial boilers often produce is saturated or wet steam, and traditional steam turbine is difficult to be used for generating electricity.
Aiming at the utilization of low-grade energy, kalina circulation can be adopted, ammonia-water mixture is used as a working medium in the circulation, and the circulation has better heat exchange matching relation with a heat source and a cold source on the whole due to the non-isothermal process of working medium phase change and the change of working medium concentration in the circulation process. Because the critical temperature of the ammonia-water solution is low, the kalina cycle can be applied to low-temperature heat sources, such as geothermal energy and industrial waste heat, can be used as the bottom cycle of a direct-fired gasoline generating set and a compression-ignition diesel generating set, and can also be applied to a circulating system of electricity-cold cogeneration. However, the circulating system has the problems of complex design, high implementation difficulty, easy poisoning caused by ammonia leakage, explosion accidents and the like.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In order to solve the above-mentioned problem of prior art, the utility model provides a pair of combined heat and power system based on screw expander and organic rankine cycle has improved the utilization ratio of the energy, and has reduced the emission of carbon sulphur nitrogen oxide.
(II) technical scheme
In order to achieve the above object, the utility model discloses a main technical scheme include:
the utility model provides a combined heat and power system based on a screw expander and organic Rankine cycle, which comprises a deaerator, a boiler, a steam-distributing cylinder, a working medium evaporator, a screw expander, a working medium condenser, a working medium circulating pump and a steam-water heat exchanger; the boiler comprises an economizer, a boiler evaporator and a steam drum which are connected in sequence; the outlet of the deaerator is communicated with the inlet of the coal economizer through a water supply pipeline, and the steam outlet of the steam drum is selectively communicated with the steam inlet of the working medium evaporator through a steam supply pipeline of the steam drum in a flow-adjustable manner; the steam pocket is selectively and adjustably communicated with the steam inlet of the steam-distributing cylinder through a steam inlet bypass of the working medium evaporator, and the steam outlet of the working medium evaporator is selectively and adjustably communicated with the steam inlet of the steam-distributing cylinder through a steam outlet pipeline of the working medium evaporator; the steam outlet of the steam-distributing cylinder is communicated with the steam inlet of the deaerator through the steam inlet pipeline of the deaerator, and the steam outlet of the steam-distributing cylinder is communicated with the steam side inlet of the steam-water heat exchanger through the steam inlet pipeline of the steam-water heat exchanger to supply heat to a heat user; the working medium outlet of the working medium evaporator is selectively communicated with the working medium inlet of the screw expander in a flow-adjustable manner through the working medium outlet pipeline of the working medium evaporator, the working medium outlet of the screw expander is communicated with the working medium inlet of the working medium condenser, the working medium outlet of the working medium condenser is communicated with the working medium circulating pump inlet through the working medium outlet pipeline of the working medium condenser, and the working medium circulating pump outlet is communicated with the working medium inlet of the working medium evaporator through the working medium inlet pipeline of the working medium evaporator.
Preferably, the lubricating oil circulation loop is further included, and a lubricating oil cooler, a lubricating oil filter and a lubricating oil circulation pump are sequentially arranged on the lubricating oil circulation loop; a lubricating oil inlet of the lubricating oil cooler is communicated with a lubricating oil outlet of the screw expander, and a lubricating oil outlet of the lubricating oil cooler is communicated with an inlet of the lubricating oil filter; the cooling system also comprises a cooling water circulation loop, wherein a cooling island and a lubricating oil cooling circulation pump are sequentially arranged on the cooling water circulation loop; the cooling water outlet of the lubricating oil cooler is communicated with the cooling water inlet of the cooling island, and the cooling water outlet of the cooling island is communicated with the cooling water inlet of the lubricating oil cooler.
Preferably, the system also comprises a raw water pool, a raw water dirt separator pipeline, a raw water dirt separator bypass, a soft water tank, a condensed water tank and a water supplementing pipeline, wherein one end of the raw water dirt separator pipeline is communicated with a water outlet of the raw water pool, and the other end of the raw water dirt separator pipeline is communicated with the soft water tank through a first pipeline and is communicated with the condensed water tank through a second pipeline; a raw water dirt separator and a softened water device are sequentially arranged on the raw water dirt separator pipeline; the raw water dirt separator bypass is connected with the raw water dirt separator in parallel, and a raw water dirt separator bypass electric valve is arranged on the raw water dirt separator bypass; the soft water tank is connected with the condensate tank in parallel, one end of the water supplementing pipeline is communicated with the soft water tank through a third pipeline and is communicated with the condensate tank through a fourth pipeline, and the other end of the water supplementing pipeline is communicated with the deaerator.
Preferably, the system also comprises a working medium condenser water inlet pipeline and a working medium condenser water outlet pipeline; one end of a working medium condenser water inlet pipeline is communicated with a water inlet of the working medium condenser, and the other end of the working medium condenser water inlet pipeline is communicated with a water supplementing pipeline; one end of the working medium condenser water outlet pipeline is communicated with the water outlet of the working medium condenser, and the other end of the working medium condenser water outlet pipeline is communicated with the water supplementing pipeline.
Preferably, the system also comprises a heat supply circulating pipeline and a steam-water heat exchanger condensation water pipeline; the heat supply circulating pipeline is communicated with the steam-water heat exchanger, and a heat user and a heat supply circulating pump are arranged on the heat supply circulating pipeline;
one end of a condensed water pipeline of the steam-water heat exchanger is connected with the steam-water heat exchanger, and the other end of the condensed water pipeline of the steam-water heat exchanger is communicated with the soft water tank through a fifth pipeline and is communicated with the condensed water tank through a sixth pipeline.
Preferably, a raw water dirt separator inlet electric valve and a raw water dirt separator outlet electric valve are arranged on the raw water dirt separator pipeline, the raw water dirt separator inlet electric valve is arranged on the water inlet side of the raw water dirt separator, and the raw water dirt separator outlet electric valve is arranged on the water outlet side of the raw water dirt separator; and a raw water dirt separator outlet electric main valve is arranged on a raw water dirt separator pipeline after the raw water dirt separator bypass is connected with the raw water dirt separator in parallel.
Preferably, the water inlet side of the water softening equipment is provided with an electric valve for the inlet of the water softening equipment, the water outlet side of the water softening equipment is provided with an electric valve for the outlet of the water softening equipment, and the water softening equipment is also connected with a salt tank; a first inlet manual valve of the soft water tank is arranged on the first pipeline; a manual valve of a first inlet of the condensation water tank is arranged on the second pipeline; a second inlet manual valve of the soft water tank is arranged on the fifth pipeline; a second inlet manual valve of the condensation water tank is arranged on the sixth pipeline; the soft water tank is also connected with an emptying device; a condensate water electric valve of the steam-water heat exchanger is arranged on the condensate water pipeline of the steam-water heat exchanger; a communicating valve is arranged between the soft water tank and the condensed water tank; the soft water tank is provided with a soft water tank sewage discharge valve; the condensation water tank is provided with a sewage draining valve of the condensation water tank; a soft water tank outlet electric valve is arranged on the third pipeline; an electric valve for an outlet of the condensation water tank is arranged on the fourth pipeline; the water replenishing pipeline is provided with a soft water tank, a condensed water tank electric main valve and a water replenishing pump, the water inlet side of the water replenishing pump is provided with a water replenishing pump inlet electric valve, and the water outlet side of the water replenishing pump is provided with a water replenishing pump outlet check valve and a water replenishing pump outlet electric valve; a working medium condenser condensate water bypass electric valve is also arranged on the water replenishing pipeline, and the working medium condenser condensate water bypass electric valve is connected with the working medium condenser in parallel; a safety valve is arranged on the deaerator; the water supplementing pipeline is communicated with the water inlet side of the deaerator through a seventh pipeline, and a manual valve behind the deaerator water inlet electric valve, a deaerator water inlet electric valve and a manual valve in front of the deaerator water inlet electric valve are arranged on the seventh pipeline.
Preferably, the system further comprises a deaerator water inlet bypass, the deaerator water inlet bypass is connected with the seventh pipeline in parallel, and a deaerator water inlet bypass manual valve is arranged on the deaerator water inlet bypass; the deaerator steam inlet electric valve is arranged on a deaerator steam inlet pipeline, the deaerator steam inlet electric valve front manual valve is arranged on the front side of the deaerator steam inlet electric valve, and the deaerator steam inlet electric valve rear manual valve is arranged on the rear side of the deaerator steam inlet electric valve.
Preferably, the steam-water separator further comprises a deaerator steam inlet bypass, the deaerator steam inlet bypass is connected with the deaerator steam inlet electric valve in parallel, and a deaerator steam inlet bypass manual valve is arranged on the deaerator steam inlet bypass; the water supply pipeline is provided with a booster pump and a water supply pump, the water inlet side of the booster pump is provided with a booster pump front electric valve, the water outlet side of the booster pump is sequentially provided with a booster pump outlet check valve and a booster pump outlet electric valve, the water inlet side of the water supply pump is provided with a water supply pump front electric valve, and the water outlet side of the water supply pump is sequentially provided with a water supply pump outlet check valve and a water supply pump outlet electric valve; the steam outlet of the steam-distributing cylinder is provided with a first electric valve of the steam-distributing cylinder and a second electric valve of the steam-distributing cylinder, the first electric valve of the steam-distributing cylinder is arranged on a steam inlet pipeline of the deaerator, the second electric valve of the steam-distributing cylinder is arranged on a steam inlet pipeline of the steam-water heat exchanger, and the steam-water heat exchanger steam inlet electric valve is also arranged on the steam inlet pipeline of the steam-water heat exchanger.
Preferably, a steam outlet of the steam drum is provided with an electric regulating valve for the steam drum outlet; a steam inlet of the working medium evaporator is provided with a working medium evaporator steam inlet electric valve; a working medium evaporator bypass electric valve is arranged on the working medium evaporator steam inlet bypass; a working medium evaporator steam outlet electric valve is arranged on the working medium evaporator steam outlet pipeline; a lubricating oil check valve is arranged at the outlet of the lubricating oil circulating pump; a working medium outlet pipeline of the working medium evaporator is provided with an electric valve at the inlet of the screw expander; a working medium condenser condensate water inlet electric valve is arranged on a working medium condenser water inlet pipeline; the working medium condenser condensate water outlet electric valve is arranged on the working medium condenser water outlet pipeline.
(III) advantageous effects
The utility model has the advantages that:
the utility model provides a pair of combined heat and power system based on screw expander and organic rankine cycle, can advance into working medium evaporimeter with the steam that originally was used for the heat supply, heat liquid organic working medium for gaseous state organic working medium, then gaseous state organic working medium gets into the screw expander and does work and is used for dragging generator electricity generation or drag other rotating equipment, the steam parameter after being cooled by organic working medium falls to and needs the parameter phase-match with the hot user, then get into vapour and water heat exchanger and heat supply network circulating water heat transfer, to the hot user heat supply, this is "distribution science, the temperature is to the mouth, the step utilizes, respectively get required" energy step and utilize the technique, not only can make energy utilization improve, but also can reduce carbon sulfur nitrogen oxide's emission.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the cogeneration system of the invention.
[ description of reference ]
1: a salt tank; 2: a water softening apparatus; 3: a soft water tank; 4: a condensation water tank; 5: a deaerator; 6: a raw water dirt separator; 7: a raw water pool; 8: a water replenishing pump; 9: a booster pump; 10: a feed pump; 11: a heat supply circulating pump; 12: a lubricating oil cooling circulation pump; 13: a lubricating oil circulation pump; 14: a working medium circulating pump; 15: a steam-water heat exchanger; 16: a boiler evaporator; 17: a coal economizer; 18: a steam drum; 19: a working medium evaporator; 20: a working medium condenser; 21: a hot user; 22: cooling the island; 23: a lubricant cooler; 24: a lube oil filter; 25: a lubricating oil check valve; 26: a screw expander; 27: a speed reducer; 28: a generator; 29: a cylinder is divided; 30: an evacuation device; 31: a safety valve; 32: a raw water dirt separator bypass electric valve; 33: an inlet electric valve of the raw water dirt separator; 34: an outlet electric valve of the raw water dirt separator; 35: an electric main valve at the outlet of the raw water dirt separator; 36: an electric valve at the inlet of the water softening equipment; 37: an electric valve at the outlet of the water softening equipment; 38: a first inlet manual valve of the soft water tank; 39: a second inlet manual valve of the soft water tank; 40: a manual valve at the first inlet of the condensation water tank; 41: a manual valve is arranged at a second inlet of the condensation water tank; 42: a communicating valve; 43: a soft water tank sewage discharge valve; 44: a sewage discharge valve of the condensation water tank; 45: an electric valve at the outlet of the soft water tank; 46: an electric valve at the outlet of the condensation water tank; 47: an electric main valve is arranged at the outlet of the soft water tank and the outlet of the condensed water tank; 48: an electric valve at the inlet of the water replenishing pump; 49: a check valve at the outlet of the water replenishing pump; 50: an electric valve at the outlet of the water replenishing pump; 51: the condensed water of the working medium condenser bypasses the electric valve; 52: an electric valve is arranged at a condensate water inlet of the working medium condenser; 53: an electric valve is arranged at a condensate outlet of the working medium condenser; 54: a manual valve of a deaerator water inlet bypass; 55: a manual valve is arranged behind the deaerator water inlet electric valve; 56: the deaerator is electrically operated to intake water; 57: a manual valve in front of the deaerator water inlet electric valve; 58: a manual valve is arranged behind the deaerator steam inlet electric valve; 59: an electric valve for steam inlet of the deaerator; 60: a manual valve in front of the deaerator steam inlet electric valve; 61: a deaerator steam inlet bypass manual valve; 62: a booster pump front electric valve; 63: a booster pump outlet check valve; 64: an electric valve at the outlet of the booster pump; 65: an electric valve in front of the feed pump; 66: a check valve at the outlet of the feed pump; 67: an electric valve at the outlet of the water supply pump; 68: a first electric valve of the air distributing cylinder; 69: a second electric valve of the air distributing cylinder; 70: an electric valve for steam inlet of the steam-water heat exchanger; 71: a condensate electric valve of the steam-water heat exchanger; 72: an electric adjusting valve at the outlet of the steam drum; 73: an electric valve for steam inlet of the working medium evaporator; 74: the working medium evaporator bypasses the electric valve; 75: the working medium evaporator steam outlet electric valve; 76: an inlet electric valve of the screw expander; 77: a water supply line; 78: a steam supply pipeline of the steam drum; 79: a working medium evaporator steam inlet bypass; 80: a working medium evaporator steam outlet pipeline; 81: a deaerator steam inlet pipeline; 82: a steam-water heat exchanger steam inlet pipeline; 83: a working medium outlet pipeline of the working medium evaporator; 84: a lube oil circulation loop; 85: a cooling water circulation loop; 86: a raw water dirt separator bypass; 87: a raw water dirt separator pipeline; 88: a water replenishing pipeline; 89: a third pipeline; 90: a fourth pipeline; 91: a working medium condenser water inlet pipeline; 92: a working medium condenser water outlet pipeline; 93: a heat supply circulation pipeline; 94: a fifth pipeline; 95: a sixth tube; 96: a working medium outlet pipeline of the working medium condenser; 97: a first pipeline; 98: a second pipeline; 99: a condensate pipeline of the steam-water heat exchanger; 100: a seventh pipeline; 101: a deaerator water inlet bypass; 102: a deaerator steam inlet bypass; 103: working medium evaporator working medium inlet pipeline.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
As shown in fig. 1, the embodiment provides a cogeneration system based on a screw expander and an organic rankine cycle, which includes a deaerator 5, a boiler, a steam-distributing cylinder 29, a working medium evaporator 19, a screw expander 26, a working medium condenser 20, a working medium circulating pump 14 and a steam-water heat exchanger 15. The boiler comprises a power generator 28 or a rotating device, wherein the rotating device can be a circulating water pump, a feed water pump, a booster pump, a water replenishing pump, a fan and a vacuum pump, and the boiler comprises an economizer 17, a boiler evaporator 16 and a steam drum 18 which are connected in sequence.
The outlet of the deaerator 5 is communicated with the inlet of the coal economizer 17 through a water supply pipeline 77, and the deaerator 5 provides deaerated water supply for the boiler. The water supply pipeline 77 is provided with a booster pump 9 and a water supply pump 10, the water inlet side of the booster pump 9 is provided with a booster pump front electric valve 62, the water outlet side of the booster pump 9 is sequentially provided with a booster pump outlet check valve 63 and a booster pump outlet electric valve 64, the water inlet side of the water supply pump 10 is provided with a water supply pump front electric valve 65, and the water outlet side of the water supply pump 10 is sequentially provided with a water supply pump outlet check valve 66 and a water supply pump outlet electric valve 67.
The steam outlet of the steam drum 18 is communicated with the steam inlet of the working medium evaporator 19 through a steam drum steam supply pipeline 78, the steam outlet of the steam drum 18 close to the steam outlet of the steam drum 78 on the steam drum steam supply pipeline 78 is provided with a steam drum outlet electric regulating valve 72 to realize that the steam in the steam drum 18 selectively enters the working medium evaporator 19 with adjustable flow, wherein the steam inlet of the working medium evaporator 19 is provided with a working medium evaporator steam inlet electric valve 73.
The steam outlet of the working medium evaporator 19 is communicated with the steam side inlet of the steam-distributing cylinder 29 through a working medium evaporator steam outlet pipeline 80, and the steam in the working medium evaporator 19 selectively enters the steam-distributing cylinder 29 with adjustable flow by arranging a working medium evaporator steam outlet electric valve 75 on the working medium evaporator steam outlet pipeline 80. In this embodiment, all the steam supplied from the steam drum 18 enters the working medium evaporator 19 through the steam drum steam supply pipeline 78, the liquid organic working medium is heated to be the gaseous organic working medium, then the gaseous organic working medium enters the screw expander to do work, and the steam parameter cooled by the organic working medium is reduced to match with the parameter required by the heat user and then enters the branch cylinder 29 from the steam outlet pipeline 80 of the working medium evaporator.
The steam outlet of the steam distributing cylinder 29 is communicated with the steam inlet of the deaerator 5 through a deaerator steam inlet pipeline 81, a deaerator steam inlet electric valve 59 is arranged on the deaerator steam inlet pipeline 81, a deaerator steam inlet electric valve front manual valve 60 is arranged on the front side of the deaerator steam inlet electric valve 59, and a deaerator steam inlet electric valve rear manual valve 58 is arranged on the rear side of the deaerator steam inlet electric valve 59. A first electric valve 68 of the steam-dividing cylinder is arranged at the steam outlet of the steam-dividing cylinder 29, wherein the first electric valve 68 of the steam-dividing cylinder is arranged on the steam inlet pipeline 81 of the deaerator.
The embodiment further comprises a deaerator steam inlet bypass 102, the deaerator steam inlet bypass 102 is connected with the deaerator steam inlet electric valve 59 in parallel, and a deaerator steam inlet bypass manual valve 61 is arranged on the deaerator steam inlet bypass 102.
The steam outlet of the steam-distributing cylinder 29 is communicated with the steam inlet of the steam-water heat exchanger 15 through the steam-water heat exchanger steam inlet pipeline 82, and the steam-water heat exchanger steam inlet electric valve 70 is arranged on the steam-water heat exchanger steam inlet pipeline 82. A second electric valve 69 of the steam-dividing cylinder is arranged at the steam outlet of the steam-dividing cylinder 29, wherein the second electric valve 69 of the steam-dividing cylinder is arranged on the steam inlet pipeline 82 of the steam-water heat exchanger. The steam in the steam-distributing cylinder 29 is divided into two parts, one part supplies heat to a heat user after entering the steam-water heat exchanger 15 through a steam-water heat exchanger steam inlet pipeline 82, and the other part is used for providing deoxygenated steam for the deoxygenator 5.
The working medium outlet of the working medium evaporator 19 is communicated with the working medium inlet of the screw expander 26 through a working medium evaporator working medium outlet pipeline 83, and the screw expander inlet electric valve 76 is arranged on the working medium evaporator working medium outlet pipeline 83, so that gaseous organic working medium in the working medium evaporator 19 can selectively enter the screw expander 26 with adjustable flow, wherein the screw expander 26 is connected with the generator 28 or rotating equipment, and certainly, the screw expander can also comprise a speed reducer 27, and the screw expander 26 is connected with the generator 28 or rotating equipment through the speed reducer 27.
The working medium outlet of the screw expander 26 is communicated with the working medium inlet of the working medium condenser 20, the working medium outlet of the working medium condenser 20 is communicated with the working medium inlet of the working medium circulating pump 14 through a working medium outlet pipeline 96 of the working medium condenser, and the working medium outlet of the working medium circulating pump 14 is communicated with the working medium inlet of the working medium evaporator 19 through a working medium inlet pipeline 103 of the working medium evaporator.
In the present embodiment, a lubricating oil circulation circuit 84 is further provided, and a lubricating oil cooler 23, a lubricating oil filter 24, a lubricating oil circulation pump 13, and a lubricating oil check valve 25 are provided in this order on the lubricating oil circulation circuit 84. A lubricant inlet of the lubricant cooler 23 communicates with a lubricant outlet of the screw expander 26, a lubricant outlet of the lubricant cooler 23 communicates with an inlet of the lubricant filter 24, and a lubricant check valve 25 is provided at a lubricant outlet of the lubricant circulation pump 13.
The cooling system further comprises a cooling water circulation loop 85, wherein the cooling island 22 and the lubricating oil cooling circulation pump 12 are sequentially arranged on the cooling water circulation loop 85, a cooling water outlet of the lubricating oil cooler 23 is communicated with a cooling island inlet of the cooling island 22, and a cooling water outlet of the cooling island 22 is communicated with a cooling water inlet of the lubricating oil cooler 23.
The embodiment further comprises a raw water tank 7, a raw water dirt separator pipeline 87, a raw water dirt separator bypass 86, a soft water tank 3, a condensed water tank 4 and a water supplementing pipeline 88, one end of the raw water dirt separator pipeline 87 is communicated with a water outlet of the raw water tank 7, the other end of the raw water dirt separator pipeline 87 is communicated with the soft water tank 3 through a first pipeline 97, and is communicated with the condensed water tank 4 through a second pipeline 98, wherein the first manual inlet valve 38 of the soft water tank is arranged on the first pipeline 97, and the first manual inlet valve 40 of the condensed water tank is arranged on the second pipeline 98. The raw water sewage remover pipeline 87 is provided with a raw water sewage remover 6 and a softened water device 2 in sequence, wherein a raw water sewage remover bypass 86 is connected in parallel with the raw water sewage remover 6, and the raw water sewage remover bypass 86 is provided with a raw water sewage remover bypass electric valve 32.
Specifically, be equipped with raw water dirt separator import electric valve 33 and raw water dirt separator export electric valve 34 on raw water dirt separator pipeline 87, raw water dirt separator import electric valve 33 sets up the side of intaking at raw water dirt separator 6, raw water dirt separator export electric valve 34 sets up the play water side at raw water dirt separator 6, be equipped with raw water dirt separator export electric main valve 35 on raw water dirt separator pipeline 87 after raw water dirt separator bypass 86 and raw water dirt separator 6 are parallelly connected, be equipped with softened water equipment import electric valve 36 in the side of intaking of softened water equipment 2, be equipped with softened water equipment export electric valve 37 in the play water side of softened water equipment 2, still be connected with salt jar 1 on softened water equipment 2.
The soft water tank 3 is parallelly connected with the water tank 4 that condenses, and the one end of moisturizing pipeline 88 is through third pipeline 89 and 3 intercommunications of soft water tank, through fourth pipeline 90 and 4 intercommunications of water tank that condenses, is equipped with soft water tank export electric valve 45 on third pipeline 89, is equipped with the water tank export electric valve 46 that condenses on fourth pipeline 90, and the other end and the oxygen-eliminating device 5 intercommunication of moisturizing pipeline 88. Specifically, the water softening tank 3 is further connected with an emptying device 30, a communication valve is arranged between the water softening tank 3 and the condensation water tank 4, the water softening tank 3 is provided with a water softening tank sewage discharge valve 43, and the condensation water tank 4 is provided with a condensation water tank sewage discharge valve 44.
The water replenishing pipeline 88 is provided with a soft water tank and condensed water tank electric main valve 47 and a water replenishing pump 8, the water inlet side of the water replenishing pump 8 is provided with a water replenishing pump inlet electric valve 48, and the water outlet side of the water replenishing pump 8 is provided with a water replenishing pump outlet check valve 49 and a water replenishing pump outlet electric valve 50.
As shown in fig. 1, the system further includes a working medium condenser water inlet pipeline 91 and a working medium condenser water outlet pipeline 92, one end of the working medium condenser water inlet pipeline 91 is communicated with the water inlet of the working medium condenser 20, the other end of the working medium condenser water inlet pipeline 91 is communicated with the water replenishing pipeline, one end of the working medium condenser water outlet pipeline 92 is communicated with the water outlet of the working medium condenser 20, and the other end of the working medium condenser water outlet pipeline 92 is communicated with the water replenishing pipeline 88. A working medium condenser condensate water inlet electric valve 52 is arranged on the working medium condenser water inlet pipeline 91, and a working medium condenser condensate water outlet electric valve 53 is arranged on the working medium condenser water outlet pipeline 92. Make-up water in the water make-up pipeline 88 enters the working medium condenser 20 through the working medium condenser water inlet pipeline 91 for heat exchange and then is discharged from the working medium condenser water outlet pipeline 92 to enter the deaerator 5, on one hand, a condensation effect is formed on the working medium condenser 20, and on the other hand, the make-up water after heat exchange enters the deaerator 5 to improve the deaerator 5 in the deaerator 5.
Preferably, a heating circulation pipeline 93 and a steam-water heat exchanger condensation water pipeline 99 are also included. The heat supply circulating pipeline 93 is communicated with the steam-water heat exchanger 15, and a heat user 21 and a heat supply circulating pump 11 are arranged on the heat supply circulating pipeline 93. One end of the steam-water heat exchanger condensed water pipeline 99 is connected with the steam-water heat exchanger 15, and the other end of the steam-water heat exchanger condensed water pipeline 99 is communicated with the soft water tank 3 through a fifth pipeline 94 and is communicated with the condensed water tank 4 through a sixth pipeline 95. The condensate water electric valve 71 of the steam-water heat exchanger is arranged on the condensate water pipeline 99 of the steam-water heat exchanger, the soft water tank second inlet manual valve 39 is arranged on the fifth pipeline 94, and the condensate water tank second inlet manual valve 41 is arranged on the sixth pipeline 95.
The water supplementing pipeline 88 is communicated with the water inlet side of the deaerator 5 through a seventh pipeline 100, and the deaerator water inlet electric valve 55 and the deaerator water inlet electric valve 56 are arranged on the seventh pipeline 100. The deaerator 5 is provided with a safety valve 31.
The system further comprises a deaerator water inlet bypass 101, the deaerator water inlet bypass 101 is connected with the seventh pipeline 100 in parallel, and a deaerator water inlet bypass manual valve 54 is arranged on the deaerator water inlet bypass 101.
The combined heat and power system based on the screw expander and the organic Rankine cycle provided by the embodiment can firstly feed steam originally used for heat supply into the working medium evaporator 19, heat the liquid organic working medium into the gaseous organic working medium, then feed the gaseous organic working medium into the screw expander 26 to do work, so as to drive the generator 28 to generate electricity or drive other rotating equipment, reduce the steam parameter cooled by the organic working medium to be matched with the parameter required by a heat user, then feed the steam-water heat exchanger 15 to exchange heat with circulating water of a heat network, and supply heat to the heat user, and the combined heat and power system is an energy gradient utilization technology with scientific distribution, temperature opposite-port utilization, gradient utilization and required energy gradient utilization.
And the working medium evaporator 19 and the screw expander 26 are arranged to reduce the parameters of the steam in the steam-water heat exchanger, so that the parameters are matched with the parameters required by a heat user, the requirements of heat supply parameters are met, the loss caused by parameter mismatching is reduced, and the generator 28 is dragged to work or other rotating equipment dragged to reduce the plant power consumption.
Of course, the system can also comprise a working medium evaporator steam inlet bypass 79, the steam pocket 18 is communicated with the steam inlet of the steam-dividing cylinder 29 through the working medium evaporator steam inlet bypass 79, and the steam can selectively enter the steam-dividing cylinder 29 with adjustable flow by arranging the working medium evaporator bypass electric valve 74 on the working medium evaporator steam inlet bypass 79. The water supplementing pipeline 88 is also provided with a working medium condenser condensed water bypass electric valve 51, and the working medium condenser condensed water bypass electric valve 51 is connected with the working medium condenser 20 in parallel.
The working principle of the combined heat and power system based on the screw expander and the organic Rankine cycle is as follows:
the deaerator 5 provides deaerated feed water for the boiler, the deaerated feed water is sent into the coal economizer 17 through the booster pump 9 and the feed pump 10, and is heated by flue gas, enters the boiler evaporator 16 to produce steam, and then enters the steam pocket 18 to supply steam. The steam supplied by the steam pocket enters the working medium evaporator 19 to exchange heat, the liquid organic working medium in the working medium evaporator 19 is heated to generate gaseous organic working medium, wherein the steam supplied by the steam pocket after heat exchange enters the steam distributing cylinder 29, the gaseous organic working medium enters the screw expander 26 to do work, the screw expander 26 is driven to drive the generator or the rotating equipment to work, the exhaust steam of the gaseous organic working medium after entering the screw expander 26 to do work enters the working medium condenser 20 to be condensed into the liquid organic working medium, the condensed liquid organic working medium enters the working medium circulating pump 14, and the condensed liquid organic working medium enters the working medium evaporator 19 after being boosted by the working medium circulating pump 14 to complete the organic Rankine cycle.
The exhausted steam of the steam drum after heat exchange enters a steam distributing cylinder 29, the steam in the steam distributing cylinder 29 is divided into two paths, one path of the steam and water enters a steam-water heat exchanger 15 to heat circulating water of a heat supply network therein and supply heat to a heat user, and the other path of the steam and water enters a deaerator 5 to deaerate the water supplied to the boiler.
The lubricating oil enters the oil system of the screw expander 26 after being boosted by the lubricating oil circulating pump 13, so that the lubricating oil is provided for the screw expander 26, the screw of the screw expander 26 is well meshed with the star wheel, and the sealing can be improved. The lubricating oil after heat exchange of the oil system of the screw expander 26 enters the lubricating oil cooler 23 for cooling, the cooled lubricating oil is filtered by the lubricating oil filter 24 and then is boosted by the lubricating oil circulating pump 13 to enter the oil system of the screw expander 26, wherein the cooling water in the lubricating oil cooler 23 is heated and then enters the cooling island 22 for heat dissipation.
Specifically, raw water is decontaminated by the raw water decontamination device 6 and then is introduced into the softened water device 2 for softening, softened water is formed and then enters the soft water tank 3, steam which enters the steam-water heat exchanger 15 and heats circulating water of the heat supply network therein is condensed into condensed water and enters the condensed water tank 4 and/or the soft water tank 3, the soft water tank 3 and/or the condensed water tank 4 provide supplementary water for the deaerator 5, and partial steam in the steam distributing cylinder 29 deaerates the supplementary water in the deaerator 5, so that the requirement of the water quality of boiler feed water is met.
When the rotation speed of the screw expander 26 is different from the rotation speed of the generator 28 or other rotating equipment to be driven, the speed reducer 27 is additionally arranged between the screw expander 26 and the generator 28 or other rotating equipment to be driven, and the rotation speed ratio of the speed reducer 27 is set according to actual conditions. When the rotational speed of the screw expander 26 is the same as the rotational speed of the generator 28 or other rotating equipment being towed, the screw expander 26 is directly connected to the generator 28 or other rotating equipment being towed.
An example of an application is provided as follows:
in a heat supply period of a 29 MW-grade industrial pulverized coal boiler, steam produced by a steam drum 18 enters a working medium evaporator 19 to exchange heat with an organic working medium, the steam is cooled to parameters matched with a heat user and then enters a steam distributing cylinder 29, a part of the steam enters a steam-water heat exchanger 15 to heat circulating water of a heat supply network, heat is supplied to the heat user, the steam is condensed into condensed water and enters a condensed water tank 4 and/or a soft water tank 3, the other part of the steam enters a deaerator 5 to deaerate boiler feed water, and the condensed water and the deaerated feed water enter a booster pump 9 and a feed water pump 10 to enter an economizer.
In a 29 MW-grade industrial pulverized coal boiler, the rated steam flow is 40t/h, the steam pressure produced by the steam drum 18 is 1.25MPa, the steam temperature is 194 ℃, and the water supply temperature required by a hot user is 120 ℃. Therefore, the steam exchanges heat with the organic working medium through the working medium evaporator 19, the steam parameter is reduced to 0.25MPa, 125 ℃, the organic working medium is heated to be in a steam state in the working medium evaporator 19, and enters the screw expander 26 to do work, and the generator 28 is dragged to generate electricity. The efficiency of the screw expander 26 is 0.76, the mechanical efficiency is 0.96, the power generation capacity of 650KW can be increased under the rated working condition, the service power consumption of the industrial pulverized coal boiler can be basically met, and the energy-saving effect is obvious.
Synthesize above-mentioned case and know, this utility model can turn into 650 KW's electric quantity with the energy of original loss at the heat supply phase to satisfy this industry pulverized coal boiler's station service power consumption, no longer used external purchase electricity basically, energy-conservation, economic effect are showing.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A combined heat and power system based on a screw expander and an organic Rankine cycle is characterized by comprising a deaerator (5), a boiler, a steam-distributing cylinder (29), a working medium evaporator (19), a screw expander (26), a working medium condenser (20), a working medium circulating pump (14) and a steam-water heat exchanger (15);
the boiler comprises an economizer (17), a boiler evaporator (16) and a steam drum (18) which are connected in sequence;
an outlet of the deaerator (5) is communicated with an inlet of the economizer (17) through a water feeding pipeline (77), and a steam outlet of the steam drum (18) is selectively communicated with a steam inlet of the working medium evaporator (19) through a steam drum steam feeding pipeline (78) in a flow-adjustable manner;
the steam pocket (18) is selectively and adjustably communicated with the steam inlet of the steam-distributing cylinder (29) through a working medium evaporator steam inlet bypass (79), and the steam outlet of the working medium evaporator (19) is selectively and adjustably communicated with the steam inlet of the steam-distributing cylinder (29) through a working medium evaporator steam outlet pipeline (80);
the steam outlet of the steam distributing cylinder (29) is communicated with the steam inlet of the deaerator (5) through a deaerator steam inlet pipeline (81), and the steam outlet of the steam distributing cylinder (29) is communicated with the steam side inlet of the steam-water heat exchanger (15) through a steam-water heat exchanger steam inlet pipeline (82);
the working medium outlet of the working medium evaporator (19) is selectively communicated with the working medium inlet of the screw expander (26) through a working medium evaporator working medium outlet pipeline (83) in a flow-adjustable manner;
the working medium outlet of the screw expander (26) is communicated with the working medium inlet of the working medium condenser (20), the working medium outlet of the working medium condenser (20) is communicated with the inlet of the working medium circulating pump (14) through a working medium outlet pipeline (96) of the working medium condenser, and the outlet of the working medium circulating pump (14) is communicated with the working medium inlet of the working medium evaporator (19) through a working medium inlet pipeline (103) of the working medium evaporator.
2. The cogeneration system based on a screw expander and an organic Rankine cycle according to claim 1, further comprising a lubricating oil circulation circuit (84), wherein a lubricating oil cooler (23), a lubricating oil filter (24) and a lubricating oil circulation pump (13) are sequentially arranged on the lubricating oil circulation circuit (84);
a lubricant oil inlet of the lubricant oil cooler (23) communicates with a lubricant oil outlet of the screw expander (26), and a lubricant oil outlet of the lubricant oil cooler (23) communicates with an inlet of the lubricant oil filter (24);
the cooling system also comprises a cooling water circulation loop (85), wherein a cooling island (22) and a lubricating oil cooling circulation pump (12) are sequentially arranged on the cooling water circulation loop (85);
the cooling water outlet of the lubricating oil cooler (23) is communicated with the cooling water inlet of the cooling island (22), and the cooling water outlet of the cooling island (22) is communicated with the cooling water inlet of the lubricating oil cooler (23).
3. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 2,
the device is characterized by further comprising a raw water pool (7), a raw water dirt separator pipeline (87), a raw water dirt separator bypass (86), a soft water tank (3), a condensed water tank (4) and a water replenishing pipeline (88), wherein one end of the raw water dirt separator pipeline (87) is communicated with a water outlet of the raw water pool (7), and the other end of the raw water dirt separator pipeline (87) is communicated with the soft water tank (3) through a first pipeline (97) and communicated with the condensed water tank (4) through a second pipeline (98);
a raw water dirt separator (6) and a softened water device (2) are sequentially arranged on the raw water dirt separator pipeline (87);
the raw water dirt separator bypass (86) is connected with the raw water dirt separator (6) in parallel, and a raw water dirt separator bypass electric valve (32) is arranged on the raw water dirt separator bypass (86);
softened water tank (3) with condensate tank (4) are parallelly connected, the one end of moisturizing pipeline (88) pass through third pipeline (89) with softened water tank (3) intercommunication, through fourth pipeline (90) with condensate tank (4) intercommunication, the other end of moisturizing pipeline (88) with oxygen-eliminating device (5) intercommunication.
4. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 3,
the system also comprises a working medium condenser water inlet pipeline (91) and a working medium condenser water outlet pipeline (92);
one end of the working medium condenser water inlet pipeline (91) is communicated with a water inlet of the working medium condenser (20), and the other end of the working medium condenser water inlet pipeline (91) is communicated with the water supplementing pipeline (88);
one end of the working medium condenser water outlet pipeline (92) is communicated with a water outlet of the working medium condenser (20), and the other end of the working medium condenser water outlet pipeline (92) is communicated with the water supplementing pipeline (88).
5. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 4,
the system also comprises a heat supply circulating pipeline (93) and a condensate pipeline (99) of the steam-water heat exchanger;
the heat supply circulating pipeline (93) is communicated with the steam-water heat exchanger (15), and a heat user (21) and a heat supply circulating pump (11) are arranged on the heat supply circulating pipeline (93);
one end of the steam-water heat exchanger condensed water pipeline (99) is connected with the steam-water heat exchanger (15), and the other end of the steam-water heat exchanger condensed water pipeline (99) is communicated with the soft water tank (3) through a fifth pipeline (94) and communicated with the condensed water tank (4) through a sixth pipeline (95).
6. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 5,
a raw water dirt separator inlet electric valve (33) and a raw water dirt separator outlet electric valve (34) are arranged on the raw water dirt separator pipeline (87), the raw water dirt separator inlet electric valve (33) is arranged on the water inlet side of the raw water dirt separator (6), and the raw water dirt separator outlet electric valve (34) is arranged on the water outlet side of the raw water dirt separator (6);
and a raw water dirt separator outlet electric main valve (35) is arranged on the raw water dirt separator pipeline (87) after the raw water dirt separator bypass (86) is connected with the raw water dirt separator (6) in parallel.
7. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 6,
a softened water equipment inlet electric valve (36) is arranged on the water inlet side of the softened water equipment (2), a softened water equipment outlet electric valve (37) is arranged on the water outlet side of the softened water equipment (2), and the softened water equipment (2) is also connected with a salt tank (1);
a first soft water tank inlet manual valve (38) is arranged on the first pipeline (97);
a first manual inlet valve (40) of the condensation water tank is arranged on the second pipeline (98);
a second soft water tank inlet manual valve (39) is arranged on the fifth pipeline (94);
a second manual inlet valve (41) of the condensation water tank is arranged on the sixth pipeline (95);
the soft water tank (3) is also connected with an emptying device (30);
a steam-water heat exchanger condensed water electric valve (71) is arranged on the steam-water heat exchanger condensed water pipeline (99);
a communicating valve (42) is arranged between the soft water tank (3) and the condensed water tank (4);
a soft water tank sewage discharge valve (43) is arranged on the soft water tank (3);
a sewage draining valve (44) of the condensation water tank is arranged on the condensation water tank (4);
a soft water tank outlet electric valve (45) is arranged on the third pipeline (89);
an electric valve (46) of an outlet of the condensation water tank is arranged on the fourth pipeline (90);
a soft water tank, a condensed water tank electric main valve (47) and a water replenishing pump (8) are arranged on the water replenishing pipeline (88), a water replenishing pump inlet electric valve (48) is arranged on the water inlet side of the water replenishing pump (8), and a water replenishing pump outlet check valve (49) and a water replenishing pump outlet electric valve (50) are arranged on the water outlet side of the water replenishing pump (8);
a working medium condenser condensed water bypass electric valve (51) is further arranged on the water supplementing pipeline (88), and the working medium condenser condensed water bypass electric valve (51) is connected with the working medium condenser (20) in parallel;
a safety valve (31) is arranged on the deaerator (5);
the water supplementing pipeline (88) is communicated with the water inlet side of the deaerator (5) through a seventh pipeline (100), and a deaerator water inlet electric valve rear manual valve (55), a deaerator water inlet electric valve (56) and a deaerator water inlet electric valve front manual valve (57) are arranged on the seventh pipeline (100).
8. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 7,
the water inlet bypass (101) of the deaerator is connected with the seventh pipeline (100) in parallel, and a manual valve (54) of the water inlet bypass of the deaerator is arranged on the water inlet bypass (101) of the deaerator;
the deaerator steam inlet electric valve (59) is arranged on the deaerator steam inlet pipeline (81), a deaerator steam inlet electric valve front manual valve (60) is arranged on the front side of the deaerator steam inlet electric valve (59), and a deaerator steam inlet electric valve rear manual valve (58) is arranged on the rear side of the deaerator steam inlet electric valve (59).
9. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 8,
the steam-intake bypass of the deaerator (102) is connected with the electric steam-intake valve (59) of the deaerator in parallel, and a manual steam-intake bypass valve (61) of the deaerator is arranged on the steam-intake bypass of the deaerator (102);
the water supply system is characterized in that a booster pump (9) and a water supply pump (10) are arranged on the water supply pipeline (77), a booster pump front electric valve (62) is arranged on the water inlet side of the booster pump (9), a booster pump outlet check valve (63) and a booster pump outlet electric valve (64) are sequentially arranged on the water outlet side of the booster pump (9), a water supply pump front electric valve (65) is arranged on the water inlet side of the water supply pump (10), and a water supply pump outlet check valve (66) and a water supply pump outlet electric valve (67) are sequentially arranged on the water outlet side of the water supply pump (10);
a steam outlet of the steam-distributing cylinder (29) is provided with a first electric valve (68) of the steam-distributing cylinder and a second electric valve (69) of the steam-distributing cylinder, the first electric valve (68) of the steam-distributing cylinder is arranged on a steam inlet pipeline (81) of the deaerator, the second electric valve (69) of the steam-distributing cylinder is arranged on a steam inlet pipeline (82) of the steam-water heat exchanger, and the steam-water heat exchanger steam inlet pipeline (82) is further provided with a steam-water heat exchanger steam inlet electric valve (70).
10. The cogeneration system based on a screw expander and an organic Rankine cycle of claim 9,
a steam outlet of the steam drum (18) is provided with a steam drum outlet electric regulating valve (72);
a steam inlet of the working medium evaporator (19) is provided with a working medium evaporator steam inlet electric valve (73);
a working medium evaporator bypass electric valve (74) is arranged on the working medium evaporator steam inlet bypass (79);
a working medium evaporator steam outlet electric valve (75) is arranged on the working medium evaporator steam outlet pipeline (80);
a lubricating oil check valve (25) is arranged at the outlet of the lubricating oil circulating pump (13);
an inlet electric valve (76) of the screw expander is arranged on the working medium outlet pipeline (83) of the working medium evaporator;
a working medium condenser condensate water inlet electric valve (52) is arranged on the working medium condenser water inlet pipeline (91);
and a working medium condenser condensate water outlet electric valve (53) is arranged on the working medium condenser water outlet pipeline (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120602971.9U CN215057620U (en) | 2021-03-19 | 2021-03-19 | Combined heat and power system based on screw expander and organic Rankine cycle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120602971.9U CN215057620U (en) | 2021-03-19 | 2021-03-19 | Combined heat and power system based on screw expander and organic Rankine cycle |
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| CN215057620U true CN215057620U (en) | 2021-12-07 |
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| CN202120602971.9U Active CN215057620U (en) | 2021-03-19 | 2021-03-19 | Combined heat and power system based on screw expander and organic Rankine cycle |
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