CN208486922U - A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank - Google Patents
A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank Download PDFInfo
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- CN208486922U CN208486922U CN201820407420.5U CN201820407420U CN208486922U CN 208486922 U CN208486922 U CN 208486922U CN 201820407420 U CN201820407420 U CN 201820407420U CN 208486922 U CN208486922 U CN 208486922U
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Abstract
The thermoelectricity that the utility model discloses a kind of based on high back pressure in conjunction with heat-accumulator tank decouples auxiliary system.The system is mainly made of Steam Turbine Through IP Admission, low pressure (LP) cylinder, heat-accumulator tank, heat exchangers for district heating, steam exhaust heater, heat user and associated pipe etc..When thermal power plant unit is in high load capacity operating condition, heat supply return water is heated by heat exchangers for district heating to meet the heat demand of heat user by conventional heat supply steam extraction, turbine back pressure is properly increased simultaneously, is heated with the low pressure (LP) cylinder steam exhaust of higher quality by accumulation of heat working medium of the steam exhaust heater to heat-accumulator tank；When unit is in running on the lower load, heat supply is carried out to heat user using the accumulation of heat refrigerant substitute part routine heat supply steam extraction heating heat supply return water of heat-accumulator tank, reduces the power output of unit.The system structure is simple, has operability, is not only able to achieve the cascade utilization of energy, moreover it is possible to the problems such as realizing that thermal power plant unit is decoupled in the thermoelectricity of running on the lower load, efficiently solving " abandonment " during new energy dissolves.
Description
Technical field
The utility model belongs to thermal power plant's flexibility technical field, is related to a kind of heat based on high back pressure in conjunction with heat-accumulator tank
Electrolysis coupling auxiliary system.
Background technique
Under the call of China's energy-saving and emission-reduction, the progress heat supply of pure condensate unit each power plant is transformed into and has promoted economy
Transformation trend.The heat supply transformation of current unit is there are mainly two types of scheme: one to be to maintain low pressure (LP) cylinder exhaust steam pressure constant, in
Low pressure (LP) cylinder communicating pipe punches steam extraction, goes heat exchangers for district heating heating to supply using the low-grade steam after the function of part has been done in steam turbine
Hot return water；Second is that improving low pressure (LP) cylinder exhaust steam pressure, heat supply network is heated using low pressure (LP) cylinder steam discharge.Currently, the first scheme
Heat supply retrofitted unit is more.
However thermal power plant unit is mostly the operational mode of " electricity determining by heat ", the demand for considering heat supply is first had to, so this pole
The earth limits the variation range of unit output, so that the peak modulation capacity of thermal power plant unit is restricted.And in order to improve heat supply machine
There are two types of the major measures of group peak modulation capacity: first is that the measure of traditional raising peak modulation capacity, by the reality for accurately determining unit
Border peak modulation capacity, to provide foundation for the peak modulation capacity that depth excavates unit；Second is that thermal power plant unit is made to realize " thermoelectricity decoupling "
To improve the measure of its peak modulation capacity.
The utility model proposes a kind of thermoelectricity decoupling auxiliary based on high back pressure in conjunction with heat-accumulator tank based on second of measure
System realizes that the thermoelectricity of thermal power plant unit decouples by configuring heat-accumulator tank and steam exhaust heater, increases the peak modulation capacity of thermal power plant unit.
Summary of the invention
The purpose of this utility model is that unit output variation is limited during heat supply for thermal power plant unit, lead to unit tune
The problems such as peak scarce capacity, proposes a kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank, by low pressure
Heat-accumulator tank in parallel on cylinder blow-off line realizes the thermoelectricity decoupling of unit, increases machine while meeting heat user side heat demand
Group load adjustable extent, enables steam extraction heat supply unit to have depth peak modulation capacity, can also ensure the grid-connected of new energy electric power
Consumption.
In order to achieve the above objectives, the utility model uses following technical scheme:
A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank, the system specifically include that in steam turbine
Cylinder pressure 1, turbine low pressure cylinder 2, generator 3, condenser 4, heat-accumulator tank 5, heat exchangers for district heating 6, steam exhaust heater 7, thermal substation 12,
Heat user 13；It is characterized in that, the Steam Turbine Through IP Admission 1, steam turbine high back pressure low pressure (LP) cylinder 2, generator 3 are sequentially connected；
1 part steam discharge of intermediate pressure cylinder is connected by heat supply extraction line 14 with the heating steam entrance side of heat exchangers for district heating 6, another part row
Vapour is connect by mesolow cylinder connecting pipe 15 with 2 steam inlet side of low pressure (LP) cylinder；Steam exhaust heater 7 is passed through in 2 steam exhaust of high and low pressure cylinder
Condenser 4 is flowed into after heat exchange to be condensed；After cold water in heat-accumulator tank 5 flows through the heating of steam exhaust heater 7 by accumulation of heat pipeline 16
It flows into heat-accumulator tank 5；Hot water in heat-accumulator tank 5 flows into heat supply feedwater piping 18 by heat release pipeline 17, changes by thermal substation 12
It is flowed back to after heat in heat-accumulator tank 5；Heat supply return water enters thermal substation by heat supply feedwater piping 18 after heat exchangers for district heating 6 is heated
12 heat exchange；Secondary network return water, which flows through, flows into secondary network feedwater piping 19 to the progress heat supply of heat user 13 after thermal substation 12 is heated.
The steam exhaust heater 7 of connecting between high back pressure low pressure (LP) cylinder 2 and condenser 4, when thermal power plant unit is in high load capacity
When lower operation, the cold water in heat-accumulator tank 5 flows into steam exhaust heater 7 from accumulation of heat pipeline 16 and is heated, and completes heat-accumulating process；Work as heat supply
When unit is run at low load, steam exhaust heater 7 is without heat-accumulating process.
The heat-accumulator tank 5 improves the back pressure of low pressure (LP) cylinder 2 when thermal power plant unit heavy-duty service, and it is cold to open heat-accumulator tank 5
Water out control valve 8, hot water inlet's control valve 9 close hot water outlet control valve 10, cold water inlet control valve 11, in heat-accumulator tank 5
Cold water flow through steam exhaust heater 7 from accumulation of heat pipeline 16,5 cold water of heat-accumulator tank by low pressure (LP) cylinder 2 steam exhaust by steam exhaust heater 7 into
It is flowed back in heat-accumulator tank 5 after row heating, completes heat-accumulating process；When thermal power plant unit underrun, 5 cooling water outlet of heat-accumulator tank is closed
Control valve 8, hot water inlet's control valve 9 open hot water outlet control valve 10, cold water inlet control valve 11, the hot water in heat-accumulator tank 5
It is flow to after heat supply feedwater piping 18 heats thermal substation 12 from heat release pipeline 17, flows back in heat-accumulator tank 5, complete heat release
Journey.
Its course of work are as follows: when thermal power plant unit is in heavy-duty service, improves the back pressure of low pressure (LP) cylinder, open the cold of heat-accumulator tank
Water out control valve, hot water inlet's control valve heat the steam exhaust of low pressure (LP) cylinder to heat-accumulator tank cold water by steam exhaust heater,
Heat-accumulator tank is in heat accumulation state；When thermal power plant unit underrun, the back pressure of low pressure (LP) cylinder is constant, utilizes the hot water generation of heat-accumulator tank
Heat supply is carried out to heat user for the conventional heat supply steam extraction in part, to reduce the power output of unit, realizes the thermoelectricity decoupling of unit.
The utility model has the following advantages that and effect:
On the basis of the steam extraction heat supply unit with power saving advantages, the combination of high back pressure low pressure (LP) cylinder and heat-accumulator tank is proposed,
The thermoelectricity decoupling for realizing steam extraction heat supply unit, solving thermal power plant unit because unit load power output variation is limited leads to peak regulation depth energy
The problems such as power is lower.
When steam extraction heat supply unit underrun, i.e., when heating demand is larger, meet heat using the heat accumulation in heat-accumulator tank
The heat demand of user can reduce unit output, increase digestion capability for new energy (especially wind power generation).
Detailed description of the invention
Fig. 1 is a kind of thermoelectricity decoupling auxiliary system schematic diagram based on high back pressure in conjunction with heat-accumulator tank.
In figure: 1- intermediate pressure cylinder；2- high back pressure low pressure (LP) cylinder；3- generator；4- condenser；5- heat-accumulator tank；6- heat exchangers for district heating；
7- steam exhaust heater；8- heat-accumulator tank cooling water outlet control valve；9- heat-accumulator tank hot water inlet's control valve；10- heat-accumulator tank hot water outlet
Control valve；11- heat-accumulator tank cold water inlet control valve valve；12- thermal substation；13- heat user；14- heat supply extraction line；It is low in 15-
Cylinder pressure communicating pipe；16- heat-accumulator tank accumulation of heat pipeline；17- heat-accumulator tank heat release pipeline；18- heat supply feedwater piping；19- secondary network water supply
Pipeline.
Specific embodiment
When the utility model at work, in the case where guaranteeing heat user heat demand, by increasing steam exhaust heater and heat-accumulator tank,
The thermoelectricity decoupling for realizing unit, can help steam extraction heat supply unit to reduce power output at low load, to realize extraction for heat supply machine
The depth peak regulation of group and elastic operation demand, solve the problems, such as that new energy dissolves.It gives and is described in detail with example with reference to the accompanying drawing.
As shown in Figure 1, the system specifically include that Steam Turbine Through IP Admission 1, turbine low pressure cylinder 2, generator 3, condenser 4,
Heat-accumulator tank 5, heat exchangers for district heating 6, steam exhaust heater 7, thermal substation 12, heat user 13；It is characterized in that, being pressed in the steam turbine
Cylinder 1, steam turbine high back pressure low pressure (LP) cylinder 2, generator 3 are sequentially connected；1 part steam discharge of intermediate pressure cylinder passes through heat supply extraction line 14 and heat
The heating steam entrance side of net heater 6 is connected, and another part steam discharge passes through mesolow cylinder connecting pipe 15 and 2 steam of low pressure (LP) cylinder
Entrance side connection；2 steam exhaust of high and low pressure cylinder flows into condenser 4 after the heat exchange of steam exhaust heater 7 and is condensed；In heat-accumulator tank 5
Cold water is flowed through after steam exhaust heater 7 heats by accumulation of heat pipeline 16 and is flowed into heat-accumulator tank 5；Hot water in heat-accumulator tank 5 passes through heat release
Pipeline 17 flows into heat supply feedwater piping 18, flows back in heat-accumulator tank 5 after the heat exchange of thermal substation 12；Heat supply return water is heated by heat supply network
Device 6 enters thermal substation 12 by heat supply feedwater piping 18 after being heated and exchanges heat；Secondary network return water flows through after thermal substation 12 is heated
It flows into secondary network feedwater piping 19 and heat supply is carried out to heat user 13.
The steam exhaust heater 7 of connecting between high back pressure low pressure (LP) cylinder 2 and condenser 4, when thermal power plant unit is in high load capacity
When lower operation, the cold water in heat-accumulator tank 5 flows into steam exhaust heater 7 from accumulation of heat pipeline 16 and is heated, and completes heat-accumulating process；Work as heat supply
When unit is run at low load, steam exhaust heater 7 is without heat-accumulating process.
The heat-accumulator tank 5 improves the back pressure of low pressure (LP) cylinder 2 when thermal power plant unit heavy-duty service, and it is cold to open heat-accumulator tank 5
Water out control valve 8, hot water inlet's control valve 9 close hot water outlet control valve 10, cold water inlet control valve 11, in heat-accumulator tank 5
Cold water flow through steam exhaust heater 7 from accumulation of heat pipeline 16,5 cold water of heat-accumulator tank by low pressure (LP) cylinder 2 steam exhaust by steam exhaust heater 7 into
It is flowed back in heat-accumulator tank 5 after row heating, completes heat-accumulating process；When thermal power plant unit underrun, 5 cooling water outlet of heat-accumulator tank is closed
Control valve 8, hot water inlet's control valve 9 open hot water outlet control valve 10, cold water inlet control valve 11, the hot water in heat-accumulator tank 5
It is flow to after heat supply feedwater piping 18 heats thermal substation 12 from heat release pipeline 17, flows back in heat-accumulator tank 5, complete heat release
Journey.
A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank, the course of work are as follows:
When unit is in heavy-duty service, heat user is normally supplied by heat exchangers for district heating by conventional heat supply steam extraction
Heat, while the back pressure of low pressure (LP) cylinder 2 is improved, 5 cooling water outlet control valve 8 of heat-accumulator tank, hot water inlet's control valve 9 are opened, is simultaneously closed off
Hot water outlet control valve 10, cold water inlet control valve 11, when the cold water in heat-accumulator tank flows through steam exhaust heater by accumulation of heat pipeline,
It is flowed back in heat-accumulator tank after being heated by steam exhaust heater 7 to it by the steam exhaust of low pressure (LP) cylinder 2, to complete heat-accumulating process.
When thermal power plant unit running on the lower load, 5 cooling water outlet control valve 8 of heat-accumulator tank, hot water inlet's control valve 9 are closed, is beaten
Hot water outlet control valve 10, cold water inlet control valve 11 are opened, the hot water of heat-accumulator tank flows into heat supply feedwater piping pair by heat release pipeline
Thermal substation flows back in heat-accumulator tank after carrying out heat supply, to complete exothermic process.
The problems such as the utility model is insufficient for steam extraction heat supply unit depth peak modulation capacity, propose it is a kind of based on high back pressure with
The thermoelectricity that heat-accumulator tank combines decouples auxiliary system.The program can be realized thermal electrolysis of the steam extraction heat supply unit in underrun
Coupling, solve thermal power plant unit leads to problems such as flexibility lower because unit load power output variation is limited, while dissolving to new energy
Also play the role of positive.
Finally, it should be noted that system described in this specification, shape, named title of components etc. can
With difference.All equivalent or simple changes done according to structure, feature and principle described in the concept of the patent of the utility model include
In in the protection scope of the utility model patent.Specific implementation process described in the utility model is not the limit to the patent
System, corresponding technical staff do various modifications or additions to the process or are substituted in a similar manner, as long as not partially
Structure from the utility model or beyond the scope defined by this claim, should belong to the protection model of the utility model
It encloses.
Claims (2)
1. a kind of thermoelectricity based on high back pressure in conjunction with heat-accumulator tank decouples auxiliary system, which, which specifically includes that in steam turbine, is pressed
Cylinder (1), turbine low pressure cylinder (2), generator (3), condenser (4), heat-accumulator tank (5), heat exchangers for district heating (6), steam exhaust heater
(7), thermal substation (12), heat user (13)；It is characterized in that, the Steam Turbine Through IP Admission (1), turbine low pressure cylinder (2), hair
Motor (3) is sequentially connected；Intermediate pressure cylinder (1) part steam discharge is steamed by the heat supply of heat supply extraction line (14) and heat exchangers for district heating (6)
Vapour entrance side is connected, and another part steam discharge is connect by mesolow cylinder connecting pipe (15) with low pressure (LP) cylinder (2) steam inlet side；It is low
Cylinder pressure (2) steam exhaust flows into condenser (4) after steam exhaust heater (7) exchange heat and is condensed；Cold water in heat-accumulator tank (5) passes through
Accumulation of heat pipeline (16) flows back in heat-accumulator tank (5) after flowing through steam exhaust heater (7) heating；Hot water in heat-accumulator tank (5) passes through heat release
Pipeline (17) flows into heat supply feedwater piping (18), flows back in heat-accumulator tank (5) after thermal substation (12) heat exchange；Heat supply return water passes through
It is exchanged heat by heat supply feedwater piping (18) into thermal substation (12) after heat exchangers for district heating (6) heating；Secondary network return water flows through heating power
It stands and flows into secondary network feedwater piping (19) after (12) are heated to heat user (13) progress heat supply.
2. a kind of thermoelectricity based on high back pressure in conjunction with heat-accumulator tank decouples auxiliary system according to claim 1, feature exists
In being in series with cooling water outlet control valve (8), hot water inlet's control valve (9) on the accumulation of heat pipeline (16)；The heat outting pipe
Hot water outlet control valve (10), cold water inlet control valve (11) are in series on road (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820407420.5U CN208486922U (en) | 2018-03-26 | 2018-03-26 | A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820407420.5U CN208486922U (en) | 2018-03-26 | 2018-03-26 | A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank |
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| CN208486922U true CN208486922U (en) | 2019-02-12 |
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| CN201820407420.5U Expired - Fee Related CN208486922U (en) | 2018-03-26 | 2018-03-26 | A kind of thermoelectricity decoupling auxiliary system based on high back pressure in conjunction with heat-accumulator tank |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854313A (en) * | 2019-03-11 | 2019-06-07 | 西安交通大学 | A kind of flexible coal generating system and operation method |
| CN111271750A (en) * | 2020-03-18 | 2020-06-12 | 青岛达能环保设备股份有限公司 | Coal fired power plant frequency modulation peak shaving system based on heat accumulator |
| CN111365748A (en) * | 2020-03-09 | 2020-07-03 | 北京国电蓝天节能科技开发有限公司 | Heat supply method and heat supply system of cogeneration unit |
-
2018
- 2018-03-26 CN CN201820407420.5U patent/CN208486922U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854313A (en) * | 2019-03-11 | 2019-06-07 | 西安交通大学 | A kind of flexible coal generating system and operation method |
| CN109854313B (en) * | 2019-03-11 | 2020-03-24 | 西安交通大学 | Flexible coal-fired power generation system and operation method |
| CN111365748A (en) * | 2020-03-09 | 2020-07-03 | 北京国电蓝天节能科技开发有限公司 | Heat supply method and heat supply system of cogeneration unit |
| CN111365748B (en) * | 2020-03-09 | 2021-06-15 | 国电龙源节能技术有限公司 | Heat supply method and heat supply system of cogeneration unit |
| CN111271750A (en) * | 2020-03-18 | 2020-06-12 | 青岛达能环保设备股份有限公司 | Coal fired power plant frequency modulation peak shaving system based on heat accumulator |
| CN111271750B (en) * | 2020-03-18 | 2024-02-20 | 青岛达能环保设备股份有限公司 | Coal-fired power plant frequency modulation peak shaving system based on heat accumulator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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