CN219431900U - Novel double-station combined cycle power generation device - Google Patents

Abstract

The utility model discloses a novel double-working-medium combined cycle power generation device, which comprises a steam Rankine cycle and a lithium bromide heat pump cycle, wherein part of exhaust steam discharged by a steam turbine enters a condenser, the other part of exhaust steam enters a lithium bromide generator to drive the lithium bromide heat pump, cold water discharged by the evaporator enters the condenser of the steam Rankine cycle, and the exhaust steam discharged by the steam turbine into the condenser is condensed; based on the traditional Rankine cycle power generation system, the combined absorption heat pump realizes the inverse Carnot cycle to reduce the dead steam pressure at the tail part of the Rankine cycle, improves the working enthalpy difference of the Rankine cycle, and improves the power generation efficiency of the system. This application draws partial higher pressure exhaust steam at traditional steam turbine low pressure jar rear portion, and drive lithium bromide absorption heat pump prepares low temperature cold water and gets into the condenser of rankine power generation cycle to reduce the pressure of the surplus exhaust steam of rankine power generation cycle, and promote the humidity of surplus exhaust steam, promote rankine cycle acting enthalpy difference, improve rankine cycle generating efficiency, promote system comprehensive efficiency.

Description

Novel double-station combined cycle power generation device

Technical Field

The utility model relates to a novel double-station combined cycle power generation device.

Background

The traditional thermal power plant is based on Rankine cycle, steam generated by a boiler enters a condenser to be condensed into water after the steam turbine finishes doing work, and then the water is pumped back to the boiler to heat, and the cycle is repeated. But the heat quantity emitted by the condenser occupies a large area, so that waste of exhaust steam is caused, and the comprehensive efficiency of the system is not high.

Disclosure of Invention

Aiming at the problems, the utility model aims to provide a novel double-station combined cycle power generation device which can reduce the pressure of residual exhaust steam of a Rankine cycle, improve the humidity of the residual exhaust steam, improve the work enthalpy difference of the Rankine cycle and improve the power generation of the Rankine cycle.

The technical scheme for realizing the utility model is as follows

The novel double-station combined cycle power generation device comprises a steam Rankine cycle and a lithium bromide heat pump cycle, wherein the steam Rankine cycle comprises a steam turbine, a condenser and a boiler, and a steam discharge end of the steam turbine is communicated with the inside of the condenser; the lithium bromide heat pump cycle comprises a lithium bromide generator, a condenser, an evaporator and an absorber,

part of exhaust steam discharged by the steam turbine enters the condenser, the other part of exhaust steam enters a lithium bromide generator in the lithium bromide heat pump, the exhaust steam entering the lithium bromide generator drives the lithium bromide heat pump, cold water discharged by an evaporator in the lithium bromide heat pump enters a condenser of the steam Rankine cycle, and the exhaust steam discharged by the steam turbine into the condenser is condensed;

the exhaust steam discharged from the lithium bromide generator and the exhaust steam discharged from the condenser enter a steam Rankine cycle for circulation;

the temperature of the exhaust steam entering the lithium bromide generator is higher than that of the exhaust steam entering the condenser.

In the middle of one kind of implementation of this application, the exhaust steam exhaust end intercommunication of steam turbine has first pipeline, second pipeline, and first pipeline intercommunication is between the steam inlet end of steam turbine exhaust steam exhaust end and condenser, and the second pipeline communicates in steam turbine exhaust steam exhaust end and the interior heat transfer pipeline one end of lithium bromide generator, and the interior heat transfer pipeline other end of lithium bromide generator passes through the third pipeline formation intercommunication with the play vapour end of condenser.

In one implementation of the present application, the second conduit is connected between the exhaust steam discharge end of the low pressure cylinder of the steam turbine and one end of the heat exchange conduit in the lithium bromide generator.

In the middle of one implementation of the application, form the intercommunication through the fourth pipeline between the heat exchange pipeline one end in the condenser and the heat exchange pipeline one end in the evaporimeter, form the intercommunication through the fifth pipeline between the heat exchange pipeline other end of condenser and the heat exchange pipeline other end in the evaporimeter, install the circulating pump on fourth pipeline or the fifth pipeline.

In one implementation of the present application, the gas discharge end of the lithium bromide generator is in communication with the interior of the condenser through a sixth conduit; the liquid discharge end of the condenser is communicated with the interior of the evaporator through a seventh pipeline, a first sprayer communicated with the seventh pipeline is arranged in the evaporator, and liquid medium in the condenser is sprayed to the periphery of a heat exchange pipeline in the evaporator through the first sprayer;

a heat exchanger is arranged between the lithium bromide generator and the absorber, and the liquid discharge end of the lithium bromide generator passes through the primary side of the heat exchanger through an eighth pipeline and then is sprayed around a heat exchange pipeline in the absorber; the liquid discharge end in the absorber passes through the secondary side of the heat exchanger through a ninth pipeline and then is sprayed around the heat exchange pipeline in the lithium bromide generator;

the liquid medium in the evaporator is led to the top in the evaporator through a tenth pipeline and sprayed around the heat exchange pipeline in the evaporator.

By adopting the technical scheme, on the basis of a traditional Rankine cycle power generation system, the method for reducing the dead steam pressure at the tail part of the Rankine cycle by combining the absorption heat pump and the inverse Rankine cycle is realized, improving the working enthalpy difference of the Rankine cycle and improving the power generation efficiency of the system. This application draws partial higher pressure exhaust steam at traditional steam turbine low pressure jar rear portion, and drive lithium bromide absorption heat pump prepares low temperature cold water and gets into the condenser of rankine power generation cycle to reduce the pressure of the surplus exhaust steam of rankine power generation cycle, and promote the humidity of surplus exhaust steam, promote rankine cycle acting enthalpy difference, improve rankine cycle generating efficiency, promote system comprehensive efficiency.

Drawings

FIG. 1 is a schematic illustration of the present utility model;

in the drawings, 100, a steam turbine, 101, a boiler, 102, a condenser, 103, a lithium bromide generator, 104, a condenser, 105, an evaporator, 106, an absorber, 107, a first pipe, 108, a second pipe, 109, a third pipe, 110, a fourth pipe, 111, a fifth pipe, 112, a circulation pump, 113, a sixth pipe, 114, a seventh pipe, 115, a heat exchanger, 116, an eighth pipe, 117, a ninth pipe, 118, and a tenth pipe are illustrated.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.

Referring to fig. 1, a novel double-working-medium combined cycle power generation device comprises a steam rankine cycle and a lithium bromide heat pump cycle, wherein the steam rankine cycle comprises a steam turbine 100, a boiler 101 and a condenser 102, a steam exhaust end of the steam turbine 100 is communicated with the inside of the condenser 102, exhaust steam after the steam turbine 100 works enters the condenser 102 to be cooled into saturated water, the saturated water is compressed and boosted through a circulating pump, then the saturated water is sent into the boiler to be heated and vaporized until the saturated water becomes superheated steam, the superheated steam enters the steam turbine 100 to be expanded and work, low-pressure steam after the work is cooled and condensed into water by the condenser 102, and the circulating pump is returned to complete a cycle.

The lithium bromide heat pump cycle comprises a lithium bromide generator 103, a condenser 104, an evaporator 105 and an absorber 106, a part of exhaust steam discharged by the steam turbine 100 enters the condenser 102 and enters the steam Rankine cycle for circulation, and the other part of exhaust steam enters the lithium bromide generator 103 in the lithium bromide heat pump for combined use, the exhaust steam entering the lithium bromide generator 103 drives the lithium bromide heat pump, cold water discharged by the evaporator 105 in the lithium bromide heat pump enters the condenser 102 of the steam Rankine cycle, and exhaust steam discharged by the steam turbine 100 into the condenser 102 is condensed; the exhaust steam discharged from the lithium bromide generator 103 and the exhaust steam discharged from the condenser 102 enter the steam Rankine cycle for circulation. The steam in the steam Rankine cycle is used as a working medium to circulate in the steam Rankine and part of the steam enters the lithium bromide heat pump cycle, and heat exchange is carried out in the lithium bromide generator 103; in the application, the internal circulation in the lithium bromide heat pump is combined at the evaporator 105 and the condenser 102, so that the combination of double working media is realized, and the steam Rankine cycle power generation is realized; in the method, the acting capacity of the residual gas is improved by sacrificing the acting capacity of the steam extraction of the partial turbine 100, so that the humidity of the exhaust steam at the outlet of the turbine 100 is increased, the acting capacity is greatly improved, and the power generation efficiency is improved.

In the concrete implementation of this application, steam exhaust discharge end intercommunication of steam turbine 100 has first pipeline 107, second pipeline 108, first pipeline 107 communicates between steam turbine 100 steam exhaust discharge end and condenser 102's inlet end, second pipeline 108 communicates in steam turbine 100 steam exhaust discharge end and the interior heat transfer pipeline one end of lithium bromide generator 103, the heat transfer pipeline other end in the lithium bromide generator 103 forms the intercommunication with condenser 102's play steam end through third pipeline 109, from the interior heat transfer pipeline exhaust steam of lithium bromide generator through third pipeline 109 with condenser discharge end steam entering rankine cycle. And the second pipeline 108 is communicated between the exhaust steam discharge end of the low-pressure cylinder of the steam turbine 100 and one end of the heat exchange pipeline in the lithium bromide generator 103.

One end of a heat exchange pipeline in the condenser 102 is communicated with one end of a heat exchange pipeline in the evaporator 105 through a fourth pipeline 110, the other end of the heat exchange pipeline of the condenser 102 is communicated with the other end of the heat exchange pipeline in the evaporator 105 through a fifth pipeline 111, and a circulating pump 112 is arranged on the fourth pipeline 110 or the fifth pipeline 111. The cold water in the heat exchange pipeline in the evaporator 105 circulates between the heat exchange pipeline in the evaporator 105 and the heat exchange pipeline in the condenser 102 through the circulating pump 112, the cold water cools the exhaust steam in the condenser 102, and the cold water after temperature rise enters the evaporator 105 to circulate in this way.

In the implementation of the present application, the gas discharge end of the lithium bromide generator 103 is communicated with the interior of the condenser 104 through a sixth pipeline 113; the liquid discharge end of the condenser 104 is communicated with the interior of the evaporator 105 through a seventh pipeline 114, a first sprayer communicated with the seventh pipeline 114 is arranged in the evaporator 105, and the liquid medium in the condenser 104 is sprayed to the periphery of a heat exchange pipeline in the evaporator 105 through the first sprayer, so that the heat exchange effect is improved; a heat exchanger 115 is arranged between the lithium bromide generator 103 and the absorber 106, and the liquid discharge end of the lithium bromide generator 103 passes through the primary side of the heat exchanger through an eighth pipeline 116 and then is sprayed around the heat exchange pipeline in the absorber 106; the liquid discharge end in the absorber 106 passes through the secondary side of the heat exchanger through a ninth pipeline 117 and then is sprayed around the heat exchange pipeline in the lithium bromide generator 103; the heat is exchanged between the liquid entering the generator from the absorber 106 and the liquid entering the absorber 106 from the lithium bromide generator 103 by the heat exchanger, so that the heat is fully utilized. The liquid medium in the evaporator 105 is led to the top in the evaporator 105 through a tenth pipe 118 and sprayed around the heat exchange pipe in the evaporator, realizing the internal circulation.

In the implementation of the application, the temperature of the exhaust steam entering the lithium bromide generator is higher than that of the exhaust steam entering the condenser; if steam is extracted from the low-pressure cylinder of the steam turbine 100 (such as the saturated temperature is 60 ℃), the residual exhaust steam enters the condenser 102 for condensation. Steam extracted from the low-pressure cylinder is used as a driving heat source to enter a generator of the lithium bromide heat pump, condensed water is mixed with condensed water of the original condenser 102 and returned to the boiler, the condenser 104 and the absorber 106 (30 ℃/35 ℃) of the lithium bromide heat pump are cooled by adopting cooling towers, cold water (25 ℃/20 ℃) produced by the evaporator side is used as cooling water of the original condenser, and the condensation pressure of the original condenser can be reduced (the original condensation temperature is reduced to 28 ℃). Compared with the original condenser, the condensation temperature is reduced, for example, the original condensation is carried out at 45 ℃, the temperature is changed to 28 ℃ for condensation, the functional capacity is increased (the work of the heat of the part from 45 ℃ to 28 ℃ is increased), but the dead steam is brought with certain humidity during the original condensation at 45 ℃, for example, 5 percent of the dead steam at 45 ℃ with the humidity at present continuously acts, the temperature of the dead steam is reduced, the humidity of the dead steam is increased, and part of the dead steam is condensed during the acting process; the increase in the capacity is 2 part of the reasons, 1 is the work done by the sensible heat of the part from 45 ℃ to 28 ℃ and 2 is the work done by the latent heat of the increase in the exhaust steam humidity.

Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present utility model to illustrate the technical solution of the present utility model, but not to limit the scope of the present utility model; although the utility model 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; in addition, the technical scheme of the utility model is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the utility model.

Claims (5)

1. The novel double-station combined cycle power generation device comprises a steam Rankine cycle and a lithium bromide heat pump cycle, wherein the steam Rankine cycle comprises a steam turbine, a condenser and a boiler, and a steam discharge end of the steam turbine is communicated with the inside of the condenser; the lithium bromide heat pump cycle comprises a lithium bromide generator, a condenser, an evaporator and an absorber, and is characterized in that,

part of exhaust steam discharged by the steam turbine enters the condenser, the other part of exhaust steam enters a lithium bromide generator in the lithium bromide heat pump, the exhaust steam entering the lithium bromide generator drives the lithium bromide heat pump, cold water discharged by an evaporator in the lithium bromide heat pump enters a condenser of the steam Rankine cycle, and the exhaust steam discharged by the steam turbine into the condenser is condensed;

the exhaust steam discharged from the lithium bromide generator and the exhaust steam discharged from the condenser enter a steam Rankine cycle for circulation;

the temperature of the exhaust steam entering the lithium bromide generator is higher than that of the exhaust steam entering the condenser.

2. The novel double-station combined cycle power generation device according to claim 1, wherein the exhaust steam discharge end of the steam turbine is communicated with a first pipeline and a second pipeline, the first pipeline is communicated between the exhaust steam discharge end of the steam turbine and the steam inlet end of the condenser, the second pipeline is communicated between the exhaust steam discharge end of the steam turbine and one end of a heat exchange pipeline in the lithium bromide generator, and the other end of the heat exchange pipeline in the lithium bromide generator is communicated with the steam outlet end of the condenser through a third pipeline.

3. The novel double-station combined cycle power plant of claim 2, wherein the second conduit is connected between the exhaust steam discharge end of the low pressure cylinder of the steam turbine and one end of the heat exchange conduit in the lithium bromide generator.

4. The novel double-station combined cycle power generation device according to claim 1, wherein one end of a heat exchange pipeline in the condenser is communicated with one end of a heat exchange pipeline in the evaporator through a fourth pipeline, the other end of the heat exchange pipeline in the condenser is communicated with the other end of the heat exchange pipeline in the evaporator through a fifth pipeline, and a circulating pump is arranged on the fourth pipeline or the fifth pipeline.

5. The novel double-station combined cycle power generation device according to claim 1, wherein the gas discharge end of the lithium bromide generator is communicated with the interior of the condenser through a sixth pipeline;

the liquid discharge end of the condenser is communicated with the interior of the evaporator through a seventh pipeline, a first sprayer communicated with the seventh pipeline is arranged in the evaporator, and liquid medium in the condenser is sprayed to the periphery of a heat exchange pipeline in the evaporator through the first sprayer;

a heat exchanger is arranged between the lithium bromide generator and the absorber, and the liquid discharge end of the lithium bromide generator passes through the primary side of the heat exchanger through an eighth pipeline and then is sprayed around a heat exchange pipeline in the absorber; the liquid discharge end in the absorber passes through the secondary side of the heat exchanger through a ninth pipeline and then is sprayed around the heat exchange pipeline in the lithium bromide generator;

the liquid medium in the evaporator is led to the top in the evaporator through a tenth pipeline and sprayed around the heat exchange pipeline in the evaporator.