CN106765023A - It is a kind of new super（It is super）Boilers activation system - Google Patents
It is a kind of new super（It is super）Boilers activation system Download PDFInfo
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- CN106765023A CN106765023A CN201710093716.4A CN201710093716A CN106765023A CN 106765023 A CN106765023 A CN 106765023A CN 201710093716 A CN201710093716 A CN 201710093716A CN 106765023 A CN106765023 A CN 106765023A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/10—Control systems for steam boilers for steam boilers of forced-flow type of once-through type
- F22B35/12—Control systems for steam boilers for steam boilers of forced-flow type of once-through type operating at critical or supercritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/14—Control systems for steam boilers for steam boilers of forced-flow type during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of new super (super-) critical boiler start-up system, including oxygen-eliminating device, the port of export of oxygen-eliminating device is provided with high-pressure heater, the port of export of high-pressure heater is provided with economizer, the port of export of economizer is provided with water-cooling wall, the port of export of water-cooling wall is connected with steam-water separator, and the port of export of steam-water separator passes through the steam-water separator high water level regulating valve being arranged in parallel and steam-water separator low water level regulating valve is connected to the arrival end of oxygen-eliminating device.Simple structure of the present invention, investment cost are relatively low, and the more domestic existing heat exchanger formula activation system of safety in operation, reliability is compared and can be greatly improved；The system in timely blowdown, reclaim heat and segmentation can be carried out to water level and be precisely controlled while reduce energy consumption, drain discharge pressure head and the carbonated drink swell increment excessive device damage for causing when can also avoid boiler startup.
Description
Technical field
The invention belongs to boiler technology field, and in particular to a kind of new super (super-) critical boiler start-up system.
Background technology
Though the activation system of domestic super (super-) critical boiler adapted is different, two classes can be classified as substantially：Tape starting is followed
The activation system of ring pump and the not activation system of tape starting circulating pump.Though starting circulating pump can cause that steam-water separator is separated
The saturation water and its heat for getting off are recycled, but the high cost with pumping system, and investment is big, and currently active circulating pump is almost complete
Portion is import, and cost is very high, simultaneously because use submersible motor startup circulating pump more, once cooling system breaks down it is easy to
The damage of pump is caused, system reliability is not enough.Though the not activation system simple system reliability and low cost of tape starting circulating pump,
Saturation water and its heat that small part steam-water separator is separated can only be reclaimed, working medium and thermal loss are larger.
The activation system with hydrophobic heat exchanger that China now uses, though recyclable working medium and partial heat and system is relatively simple
It is single, but, the system when water quality is unqualified, blowdown poor-performing.When boiler cold-state starts, drain discharge pressure head and vapour
Water swell increment easily causes device damage when excessive.During boiler hot start-up, steam-water separator operating pressure is higher than or waits
When certain pressure, separator drain valve self-locking, steam-water separator major part is hydrophobic can only be after hydrophobic heat exchanger reduction water temperature
Deaerator storage tank is entered, causes deaerator storage tank pressure rise, safety valve opens jump, has both wasted heat and working medium, pollutes again
Surrounding environment.Although safety valve opens to jump lets out vapour to only or so a few minutes time for returning seat, influence larger.In addition, domestic existing
Its steam-water separator of activation system with hydrophobic heat exchanger is hydrophobic only by bypass valve control, it is impossible to which steam-water separator water level is carried out
Discrete control, therefore security is not high.
The content of the invention
It is an object of the invention to provide a kind of new super (super-) critical boiler start-up system, to overcome above-mentioned prior art
The defect of presence, simple structure of the present invention, investment cost are relatively low, and the more domestic existing band heat exchange of safety in operation, reliability
Device formula activation system is compared and can be greatly improved；The system is while timely blowdown, recovery heat and reduction energy consumption
Segmentation can be carried out to water level to be precisely controlled, drain discharge pressure head and carbonated drink swell increment is excessive causes when can also avoid boiler startup
Device damage.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that：
A kind of new super (super-) critical boiler start-up system, including oxygen-eliminating device, the port of export of oxygen-eliminating device are provided with hyperbaric heating
Device, the port of export of high-pressure heater is provided with economizer, and the port of export of economizer is provided with water-cooling wall, and the port of export of water-cooling wall is connected with
Steam-water separator, the port of export of steam-water separator passes through steam-water separator high water level regulating valve and the steam-water separator being arranged in parallel
Low water level regulating valve is connected to the arrival end of oxygen-eliminating device.
Further, bypass electric gate valve is provided between high-pressure heater and economizer.
Further, it is provided with feed-regulating valve between the port of export of high-pressure heater and bypass electric gate valve.
Further, parallel connection is provided with hydrophobic heat exchanger, arrival end and the carbonated drink point of hydrophobic heat exchanger on bypass electric gate valve
The port of export from device is connected, and the port of export of hydrophobic heat exchanger is connected to condenser by steam-water separator drain valve.
Further, the port of export of hydrophobic heat exchanger is also associated with blowoff valve.
Further, the arrival end of oxygen-eliminating device aids in level control valve to be connected to condenser by steam-water separator.
Further, the port of export of condenser is connected to low-pressure heater, the outlet of low-pressure heater by condensate pump
End is connected to oxygen-eliminating device.
Further, it is provided with feed pump between the port of export and high-pressure heater of oxygen-eliminating device.
Compared with prior art, the present invention has following beneficial technique effect：
The port of export of steam-water separator of the invention passes through steam-water separator high water level regulating valve and the carbonated drink being arranged in parallel
Separator low water level regulating valve is connected to the arrival end of oxygen-eliminating device, and this high-low water level control valve can be in start-up course to water level
Carry out segmentation to be precisely controlled, compared to the control system of only single level control valve, the security of system operation has been obtained significantly
Degree is improved.
Further, the present invention increased hydrophobic heat exchanger bypass duct and bypass electric brake on boiler feedwater pipeline
Valve.During boiler startup and underrun, bypass electric gate valve is closed, and feedwater flows to hydrophobic heat exchanger, and normal in boiler
During operation, bypass electric gate valve is opened, and economizer is flowed to moisture two-way parallel connection, and hydrophobic heat exchange is reduced to reduce SR
Device metal consumption.Compared with domestic existing heat exchanger system, the system was classified as before hydrophobic entrance heat exchanger
Two-way, drain discharge pressure head and the carbonated drink swell increment excessive device damage for causing when can avoid boiler startup.
Further, the port of export of hydrophobic heat exchanger is also associated with blowoff valve, increased blowoff line and increasing drains into ground
The size of ditch pipeline, so as to increase water quality when boiler cold-state starts it is unqualified and be difficult to enter condenser carry out working medium circulation when
Sewage row trench discharge capacity, advantageously reduce the workload of water treatment facilities, at the same can accelerate stove water water quality purification speed
Degree, to make boiler water quality meet the requirements as quickly as possible.
Further, steam-water separator auxiliary water level regulation has been installed additional again after the high and low level control valve of steam-water separator
Valve, the purpose for installing this gate valve additional is that can aid in the high and low level control valve to carry out water level regulation, and when deaerator storage tank pressure liter
Gao Shi, can in time open this gate valve and discharge water, and the pressure of deaerator storage tank is reduced to a certain extent, and oxygen-eliminating device water is avoided as far as possible
Case safety valve opens jump.The reason for deaerator storage tank safety valve opens jump is that moment a large amount of high temperature are hydrophobic enters product after deaerator storage tank
The a large amount of steam of life cause that tank pressure is raised.Due to steam specific volume hundreds times bigger than the specific volume of water, so can only be one by discharging water
Determine to delay safety valve to open the jump time in degree, should again be aided with correctly change burning rate operation, so as to avoid safety valve from opening jump.
Further, in order that oxygen-eliminating device can safe operation, additional safety valve must be designed on deaerator storage tank.
For low capacity direct current cooker, these additional safety doors are arranged on deaerator storage tank, do not feel difficult also.But for more
Large sized unit, not only runs into the difficulty in arrangement, and expense is also greatly increased.Therefore, the present invention dredges steam-water separator
After water carries out heat exchange through hydrophobic heat exchanger, working medium recovery is carried out into condenser, without entering deaerator storage tank.Such energy
The hydrophobic amount that deaerator storage tank is discharged into during hot starting, hot start carbonated drink expands is reduced, the original of oxygen-eliminating device pressure rise is inherently eliminated
Cause so that the system can image-tape pumping system equally reclaim the heat of working medium and condensate in start-up course, reduce energy and disappear
Consumption, while turn avoid starting the system excessively complicated and Problem of System Reliability that circulating pump and accessory system are brought.
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention.
Wherein：1st, oxygen-eliminating device；2nd, feed pump；3rd, high-pressure heater；4th, feed-regulating valve；5th, hydrophobic heat exchanger；6th, coal is saved
Device；7th, water-cooling wall；8th, steam-water separator；9th, steam-water separator high water level regulating valve；10th, steam-water separator low water level regulating valve；
11st, steam-water separator auxiliary level control valve；12nd, steam-water separator drain valve；13rd, blowoff valve；14th, condenser；15th, condensate
Pump；16th, low-pressure heater；17th, electric gate valve is bypassed.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
A kind of new super (super-) critical boiler start-up system, including oxygen-eliminating device 1, the port of export of oxygen-eliminating device 1 are provided with high pressure and add
Hot device 3, the port of export of high-pressure heater 3 is provided with economizer 6, and bypass electric gate valve is provided between high-pressure heater 3 and economizer 6
17, feed-regulating valve 4 is provided between the port of export and bypass electric gate valve 17 of high-pressure heater 3, on bypass electric gate valve 17 simultaneously
Connection is provided with hydrophobic heat exchanger 5, and the arrival end of hydrophobic heat exchanger 5 is connected with the port of export of steam-water separator 8, hydrophobic heat exchanger 5
The port of export is connected to condenser 14 by steam-water separator drain valve 12, and the port of export of hydrophobic heat exchanger 5 is also associated with blowoff valve
13, the port of export of economizer 6 is provided with water-cooling wall 7, and the port of export of water-cooling wall 7 is connected with steam-water separator 8, steam-water separator 8
The port of export passes through the steam-water separator high water level regulating valve 9 being arranged in parallel and steam-water separator low water level regulating valve 10 is connected to and removes
The arrival end of oxygen device 1, the arrival end of oxygen-eliminating device 1 aids in level control valve 11 to be connected to condenser 14 by steam-water separator, cold
The port of export of condenser 14 is connected to low-pressure heater 16 by condensate pump 15, and the port of export of low-pressure heater 16 is connected to deoxygenation
Device 1, feed pump 2 is provided between the port of export and high-pressure heater 3 of oxygen-eliminating device 1.
The system synthesis is stronger, has received with pump startup and the advantage without pump startup system, while overcoming two kinds
The deficiency of activation system.During boiler startup, in steam-water separator 8 it is hydrophobic be arranged on the hydrophobic of the entrance of economizer 6
Heat exchanger 5 carries out heat exchange with feedwater, and the saturation water separated using steam-water separator 8 is heated to system feedwater, is returned
Heat is received so as to improve feed temperature.Because hydrophobic heat exchanger 5 has reclaimed energy, if equipped with flash vessel, it is possible to reduce
Into the energy of the working medium of flash vessel, the pressure of flash vessel system, the security of safeguards system are alleviated.
Implementation process of the invention is further described below in conjunction with the accompanying drawings：
Referring to Fig. 1, a kind of new super (super-) critical boiler start-up system, it include steam-water separator 8, hydrophobic heat exchanger 5,
Oxygen-eliminating device 1 and related valve etc..Feature is that the activation system is to install the bypass duct of hydrophobic heat exchanger 5 and side in feedwater piping
Logical electric gate valve 17, economizer 6 is flowed to moisture two-way parallel connection.The hydrophobic of steam-water separator 8 is divided into two-way, one in start-up course
Road carries out working medium recovery by flowing to condenser 14 if water quality is qualified after hydrophobic heat exchanger 5, and blow-off pipe is entered if unqualified
Road.By HWR (steam-water separator high water level controls valve 9) in parallel, (steam-water separator low water level controls valve with LWR on another road
10) after, oxygen-eliminating device 1 is drained into if water quality requirement is met, otherwise draining into condenser 14 carries out working medium recovery.Steam-water separator 8
Water tank takes HWR and LWR valve Discrete controls with the height change of liquid level in operation, and control in two stages, works as quantity of steam
When reaching certain setting value, before (such as 6%MCR), by HWR controls, after closing HWR, water storage tank water level depends on LWR to water storage tank water level
Control, after after the closing of LWR valves, boiler enters DC operation state.
Specific implementation process is as follows：
The main start-up course of boiler steam and water circuit includes cleaning boiler, ignition of the boiler and increasing temperature and pressure, steam turbine red switch simultaneously
Several processes such as the wet-dry state conversion of net, separator.
The unit started after initial start-up or long-term blowing out need to before activation carry out cold conditions or warm state cleaning, will contain impurity
Water discharge system outside, during cleaning, underproof water enters trench through blowoff valve 13.By the outlet of water-cooling wall 7 during startup
The two-phase medium that header is drawn causes steam-water separator 8 by fairlead, and working medium is in steam-water separator 8 in the presence of centrifugal force
Carry out steam-water separation.In hydrophobic heat exchanger 5, the steam-water separator that flue gas heat is absorbed in economizer 6 and water-cooling wall 7 is dredged
Water carries out heat exchange with boiler feedwater, so as to reduce hydrophobic heat loss, and by hydrophobic in water quality conjunction after level control valve
Lattice, to meet and be discharged to oxygen-eliminating device 1 under the requirement of system safety operation, to realize that oxygen-eliminating device 1 reclaims working medium and heat, when water quality reaches
When can not enter oxygen-eliminating device 1 less than setting, then condenser 14 is individually drained into by steam-water separator auxiliary level control valve 11,
This enables the system in simple structure and need not start the recyclable whole working medium of situation and most of working medium heat of circulating pump.
During startup, according to the requirement that startup stage boiler is instructed, the water tank regulating valve to steam-water separator 8 carries out phase
The control answered, typically 30min or so after firing, as Temperature of Working gradually rises, working medium begins to boil off, and volume will increase suddenly
Plus, easily there is carbonated drink swelling in water-cooling wall 7.Water level rises very rapidly up to high water level in the water storage tank of steam-water separator 8, now opens
Steam-water separator high water level controls valve 9, and water level is adjusted in time, after after water level decreasing, valve is controlled using steam-water separator low water level
10 maintain stable level, and carbonated drink swell increment seldom, can directly use steam-water separator low water level in hot and very hot startup
Control valve 10 carries out water level regulation.When the pressure of oxygen-eliminating device 1 is higher than its design pressure, water level can (steam-water separator be auxiliary by BSW
Help level control valve 11) it is adjusted.To prevent during 8 water-level fluctuation of steam-water separator, regulating valve frequent movement in small guide vane,
Should cause, when Regulate signal is more than a certain setting value, just to allow respective valves to open, when Regulate signal is less than a certain setting value
When, just allow respective valves to close.
After boiler ignition start is grid-connected, on the premise of certain feedwater flow, it is necessary to realize wet/dry state conversion.Circulation turns
Direct current is that boiler continues the important node that load rises, while it is related to the conversion of multiple valves and piping flow to control, it is important
Condition is exactly to control the entrance Temperature of Working of steam-water separator 8 to should be higher than that 20~30 DEG C of saturation temperature, and key point is exactly to control fuel
With the ratio of feedwater.When certain load is raised to, Close All high-low pressure turbine by pass valve, water storage tank water level is gradually reduced, vapour
Separator level control valve also will be turned down gradually, and after hygrometric state is completely converted into dry state, boiler enters DC operation, and water level is adjusted
Section valve is fully closed.
Claims (8)
1. a kind of new super (super-) critical boiler start-up system, it is characterised in that including oxygen-eliminating device (1), the outlet of oxygen-eliminating device (1)
End is provided with high-pressure heater (3), and the port of export of high-pressure heater (3) is provided with economizer (6), and the port of export of economizer (6) is provided with
Water-cooling wall (7), the port of export of water-cooling wall (7) is connected with steam-water separator (8), and the port of export of steam-water separator (8) is by parallel connection
Steam-water separator high water level regulating valve (9) and steam-water separator low water level regulating valve (10) of setting are connected to oxygen-eliminating device (1)
Arrival end.
2. a kind of new super (super-) critical boiler start-up system according to claim 1, it is characterised in that high-pressure heater
(3) bypass electric gate valve (17) is provided with and economizer (6) between.
3. a kind of new super (super-) critical boiler start-up system according to claim 2, it is characterised in that high-pressure heater
(3) feed-regulating valve (4) is provided between the port of export and bypass electric gate valve (17).
4. a kind of new super (super-) critical boiler start-up system according to claim 2, it is characterised in that bypass electric brake
Parallel connection is provided with hydrophobic heat exchanger (5) on valve (17), and the arrival end of hydrophobic heat exchanger (5) connects with the port of export of steam-water separator (8)
Connect, the port of export of hydrophobic heat exchanger (5) is connected to condenser (14) by steam-water separator drain valve (12).
5. a kind of new super (super-) critical boiler start-up system according to claim 4, it is characterised in that hydrophobic heat exchanger
(5) the port of export is also associated with blowoff valve (13).
6. a kind of new super (super-) critical boiler start-up system according to claim 1, it is characterised in that oxygen-eliminating device (1)
Arrival end by steam-water separator aid in level control valve (11) be connected to condenser (14).
7. a kind of new super (super-) critical boiler start-up system according to claim 4 or 6, it is characterised in that condenser
(14) the port of export is connected to low-pressure heater (16) by condensate pump (15), and the port of export of low-pressure heater (16) is connected to
Oxygen-eliminating device (1).
8. a kind of new super (super-) critical boiler start-up system according to claim 1, it is characterised in that oxygen-eliminating device (1)
The port of export and high-pressure heater (3) between be provided with feed pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710093716.4A CN106765023B (en) | 2017-02-21 | 2017-02-21 | Novel supercritical boiler starting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710093716.4A CN106765023B (en) | 2017-02-21 | 2017-02-21 | Novel supercritical boiler starting system |
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| CN106765023A true CN106765023A (en) | 2017-05-31 |
| CN106765023B CN106765023B (en) | 2022-10-18 |
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| CN201710093716.4A Active CN106765023B (en) | 2017-02-21 | 2017-02-21 | Novel supercritical boiler starting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108036301A (en) * | 2018-01-09 | 2018-05-15 | 西安热工研究院有限公司 | A kind of system and method for high temperature gas cooled reactor nuclear power generating sets steam-water separator drain recovery |
| CN109442372A (en) * | 2018-11-14 | 2019-03-08 | 东方菱日锅炉有限公司 | Waste heat boiler boiler water circulating system with auxiliary steam |
| CN113446649A (en) * | 2021-07-30 | 2021-09-28 | 西安热工研究院有限公司 | Logic control system and method for high-energy water inlet regulating valve in double control modes |
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| CN206817442U (en) * | 2017-02-21 | 2017-12-29 | 陕西华电发电有限责任公司 | A kind of new super " super " boilers activation system |
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| CN108036301A (en) * | 2018-01-09 | 2018-05-15 | 西安热工研究院有限公司 | A kind of system and method for high temperature gas cooled reactor nuclear power generating sets steam-water separator drain recovery |
| CN109442372A (en) * | 2018-11-14 | 2019-03-08 | 东方菱日锅炉有限公司 | Waste heat boiler boiler water circulating system with auxiliary steam |
| CN109442372B (en) * | 2018-11-14 | 2024-03-08 | 东方菱日锅炉有限公司 | Waste heat boiler water circulation system with auxiliary steam |
| CN113446649A (en) * | 2021-07-30 | 2021-09-28 | 西安热工研究院有限公司 | Logic control system and method for high-energy water inlet regulating valve in double control modes |
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| Publication number | Publication date |
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| CN106765023B (en) | 2022-10-18 |
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