CN103438420B - Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube - Google Patents
Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube Download PDFInfo
- Publication number
- CN103438420B CN103438420B CN201310380681.4A CN201310380681A CN103438420B CN 103438420 B CN103438420 B CN 103438420B CN 201310380681 A CN201310380681 A CN 201310380681A CN 103438420 B CN103438420 B CN 103438420B
- Authority
- CN
- China
- Prior art keywords
- water
- boiler
- cooling wall
- type flame
- working medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses a kind of method controlling overtemperature of W-type flame supercritical once-through boiler water wall tube, when its method is run under subcritical behavior for boiler, as far as possible the method improves boiler main steam pressure by controlling opening of valve; The operating pressure of water-cooling wall working medium is increased by improving boiler main steam pressure, thus the density contrast of working medium in reduction water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, thus the heat transfer vicious circle that alleviation W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.The present invention effectively can alleviate the heat transfer vicious circle that W-type flame supercritical once-through boiler water wall tube screen easily occurs, operations staff is made to have the sufficient time to adjust accordingly for the region that water-cooling wall temperature is high, thus greatly reduce the water-cooling wall overtemperature frequency, improve boiler operatiopn security.
Description
Technical field
The present invention relates to a kind of method controlling overtemperature of W-type flame supercritical once-through boiler water wall tube, belong to thermal power plant and run control technology field.
Background technology
W type flame supercritical once-through boiler is the up-to-date type of furnace of one being configured at supercritical unit, the supercritical unit that whole world Shou Tai joins W type flame direct current cooker is successfully gone into operation in July, 2009 operation (Hunan China economizes power plant of golden Zhushan County), the subsequently domestic same type units of operation multiple stage successively.W type flame supercritical once-through boiler is in debugging, running, the problem of the generality that comes out, namely when boiler load is lower very easily there is overtemperature (especially when water-cooling wall outlet pressure is lower than critical pressure) in water screen tube, causes Waterwall tube failure time serious.
What the water-cooling wall of W type flame supercritical once-through boiler all adopted is vertical tube plates, working medium in water-cooling wall is deficient enthalpy water and steam water interface, working medium provides power by feed pump, flow from bottom to top in water screen tube, in flow process, working medium constantly absorbs the heat that water screen tube transmission comes, thus completes the conversion of water → high-pressure and high-temperature steam.The origin of heat of water screen tube, in stove fuel combustion, because stove combustion cannot accomplish complete equilibrium, so the heat that each water screen tube receives also is unbalanced, causes the heat that in water screen tube, working medium absorbs also not identical further.Its working medium steam generating capacity of water-cooling wall pipe that heat receiving amount is large is high, otherwise steam generating capacity is low.When boiler water wall outlet pressure is lower than critical pressure, steam is larger with the density contrast of water, therefore when lower than critical pressure, working medium in water-cooling wall becomes in the process of vapour by water, the generation of steam bubble and the expansion of working medium all can cause the increase of flow resistance, therefore the higher pipe working medium flow resistance of steam generating capacity is larger, when the import and export pressure reduction of panelized-tube-wall section is substantially identical, the water-cooling wall pipe working medium flow that flow resistance is large is low, the overall heat that working medium is walked from this water screen tube cornice is also just few, and the temperature of water-cooling wall pipe is just higher.And this is a vicious circle, that is: the water-cooling wall being heated strong pipe → tube wall temperature is high → caloric receptivity of unit working medium is large → working medium steam generating capacity is high → flow resistance is large → working medium flow is low → overall heat that working medium absorbs from water screen tube is few → and tube wall temperature raises further.So in this type boiler actual motion, boiler load is lower especially run at subcritical behavior time, stove combustion is once fluctuate (sometimes or even Slight undulations), often occur that water screen tube wall temperature rapidly rises, operations staff has little time to take regulating measures just to occur overtemperature toward contact.
Solve the problem, there are two kinds of methods, one is adjust from combustion side, ensure that the heat intensity of all water screen tubes is balanced, but the burner due to W type flame supercritical once-through boiler distributes along stove cross direction in boiler arch, in the process of boiler switching burner, will inevitably occur that the combustion intensity of regional area is higher or on the low side, therefore ensure that the homogeneity of stove combustion cannot realize, the lack of uniformity of burning can only be reduced by some measures as far as possible, limitedly improve water screen tube degree of being heated evenly; Two is take measures in working medium side, current domestic W type flame supercritical once-through boiler, the measure taked in working medium side is all generally improve working medium (feedwater) inlet temperature, the reduction intermediate point degree of superheat etc., these measures can improve water-cooling wall hydrodynamic stability and reduce water-cooling wall and always recept the caloric, but cannot alleviate the heat transfer vicious circle (the water-cooling wall pipe → tube wall temperature being namely heated strong is high → working medium flow is low → tube wall temperature raises further) of water screen tube.In sum, the prophylactico-therapeutic measures practical application effect that current domestic W type flame supercritical once-through boiler is taked water-cooling wall overtemperature is limited, effectively can not alleviate the measure of water screen tube heat transfer vicious circle.
Summary of the invention
The technical problem to be solved in the present invention is to provide the heat transfer vicious circle that a kind of effective alleviation W-type flame supercritical once-through boiler water wall tube screen easily occurs, greatly reduce the water-cooling wall overtemperature frequency, improve the method for the control overtemperature of W-type flame supercritical once-through boiler water wall tube of boiler operatiopn security, to overcome the deficiencies in the prior art.
Technical scheme of the present invention is: the method controlling overtemperature of W-type flame supercritical once-through boiler water wall tube, and when its method is run under subcritical behavior for boiler, the method is by regulating steam turbine admission pitch aperture to improve boiler main steam pressure as far as possible; The operating pressure of water-cooling wall working medium is increased by improving boiler main steam pressure, thus the density contrast of working medium in reduction water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, thus the heat transfer vicious circle that alleviation W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
The method of above-mentioned control overtemperature of W-type flame supercritical once-through boiler water wall tube is, its system comprises water-cooling wall inlet header, water-cooling wall outlet header, separator and steam turbine admission pitch, when boiler runs under subcritical behavior, regulate the aperture of steam turbine admission pitch, separator and water-cooling wall outlet header is improved by the pressure transmission of fluid system, the pressure of liquid in water-cooling wall inlet header, thus improve the operating pressure of water-cooling wall working medium, reduce the density contrast of working medium in water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, alleviate the heat transfer vicious circle that W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
The method of aforesaid control overtemperature of W-type flame supercritical once-through boiler water wall tube is, the valve that its raising boiler main steam pressure regulates is steam turbine admission pitch.
Compared with the prior art, this simple measure of main steam pressure when the present invention runs by improving boiler at low load, effectively can alleviate the heat transfer vicious circle that W-type flame supercritical once-through boiler water wall tube screen easily occurs, operations staff is made to have the sufficient time to adjust accordingly for the region that water-cooling wall temperature is high, thus greatly reduce the water-cooling wall overtemperature frequency, improve boiler operatiopn security.
accompanying drawing description
Fig. 1 is W type flame supercritical once-through boiler liquid system diagram
Fig. 2 is W type flame supercritical once-through boiler structural representation;
Fig. 3 is water screen tube Working fluid flow and the schematic diagram that is heated.
Detailed description of the invention
Embodiment, as shown in Figure 1,2 and 3, what the water-cooling wall of W type flame supercritical once-through boiler all adopted is vertical tube plates, working medium in water-cooling wall is deficient enthalpy water and steam water interface, working medium provides power by feed pump, flow from bottom to top in water screen tube, in flow process, working medium constantly absorbs the heat that water screen tube transmission comes, thus completes the conversion of water → high-pressure and high-temperature steam.The origin of heat of water screen tube, in stove fuel combustion, because stove combustion cannot accomplish complete equilibrium, so the heat that each water screen tube receives also is unbalanced, causes the heat that in water screen tube, working medium absorbs also not identical further.Its working medium steam generating capacity of water-cooling wall pipe that heat receiving amount is large is high, otherwise steam generating capacity is low.When boiler water wall outlet pressure is lower than critical pressure, steam is larger with the density contrast of water, therefore when lower than critical pressure, working medium in water-cooling wall becomes in the process of vapour by water, the generation of steam bubble and the expansion of working medium all can cause the increase of flow resistance, therefore the higher pipe working medium flow resistance of steam generating capacity is larger, when the import and export pressure reduction of panelized-tube-wall section is substantially identical, the water-cooling wall pipe working medium flow that flow resistance is large is low, the overall heat that working medium is walked from this water screen tube cornice is also just few, and the temperature of water-cooling wall pipe is just higher.And this is a vicious circle, that is: the water-cooling wall being heated strong pipe → tube wall temperature is high → caloric receptivity of unit working medium is large → working medium steam generating capacity is high → flow resistance is large → working medium flow is low → overall heat that working medium absorbs from water screen tube is few → and tube wall temperature raises further.So in this type boiler actual motion, boiler load is lower especially run at subcritical behavior time, stove combustion is once fluctuate (sometimes or even Slight undulations), often occur that water screen tube wall temperature rapidly rises, operations staff has little time to take regulating measures just to occur overtemperature toward contact.For solving the problem, applicant improves boiler main steam pressure by regulating steam turbine admission pitch aperture as far as possible; The operating pressure of water-cooling wall working medium is increased by improving boiler main steam pressure, thus the density contrast of working medium in reduction water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, thus the heat transfer vicious circle that alleviation W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
Concretely, see that its system of Fig. 1 comprises water-cooling wall inlet header 1, water-cooling wall outlet header 2, separator 3 and steam turbine admission pitch 4, when boiler runs under subcritical behavior, regulate the aperture of steam turbine admission pitch 4, separator 3 and water-cooling wall outlet header 2 is improved by the pressure transmission of fluid system, the pressure of liquid in water-cooling wall inlet header 1, thus improve the operating pressure of water-cooling wall working medium, reduce the density contrast of working medium in water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, alleviate the heat transfer vicious circle that W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
Claims (3)
1. control a method for overtemperature of W-type flame supercritical once-through boiler water wall tube, when its method is run for boiler under subcritical behavior, it is characterized in that: the method is by regulating steam turbine admission pitch aperture to improve boiler main steam pressure as far as possible; The operating pressure of water-cooling wall working medium is increased by improving boiler main steam pressure, thus the density contrast of working medium in reduction water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, thus the heat transfer vicious circle that alleviation W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
2. the method for control overtemperature of W-type flame supercritical once-through boiler water wall tube according to claim 1, it is characterized in that: its system comprises water-cooling wall inlet header (1), water-cooling wall outlet header (2), separator (3) and steam turbine admission pitch (4), when boiler runs under subcritical behavior, regulate the aperture of steam turbine admission pitch (4), separator (3) and water-cooling wall outlet header (2) is improved by the pressure transmission of fluid system, the pressure of liquid in water-cooling wall inlet header (1), thus improve the operating pressure of water-cooling wall working medium, reduce the density contrast of working medium in water screen tube, the recruitment of its Working fluid flow resistance of water-cooling wall pipe being heated strong is reduced, alleviate the heat transfer vicious circle that W type flame supercritical boiler water-cooling wall vertical tube plates easily occurs.
3. the method for control overtemperature of W-type flame supercritical once-through boiler water wall tube according to claim 2, is characterized in that: the valve that its raising boiler main steam pressure regulates is steam turbine admission pitch (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310380681.4A CN103438420B (en) | 2013-08-28 | 2013-08-28 | Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310380681.4A CN103438420B (en) | 2013-08-28 | 2013-08-28 | Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103438420A CN103438420A (en) | 2013-12-11 |
| CN103438420B true CN103438420B (en) | 2016-02-10 |
Family
ID=49692120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310380681.4A Active CN103438420B (en) | 2013-08-28 | 2013-08-28 | Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103438420B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856376B (en) * | 2021-01-19 | 2022-07-15 | 浙江浙能兰溪发电有限责任公司 | Control method for overtemperature of boiler water-cooling wall of supercritical unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4870823A (en) * | 1988-11-30 | 1989-10-03 | Westinghouse Electric Corp. | Low load operation of steam turbines |
| CN101451709A (en) * | 2008-12-31 | 2009-06-10 | 柴庆宣 | Piping-main scheme boiler load coordinating control method |
| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
| CN103185333A (en) * | 2013-05-06 | 2013-07-03 | 安徽省电力科学研究院 | Method for coordinating and controlling quality change of coal in supercritical once-through boiler unit |
-
2013
- 2013-08-28 CN CN201310380681.4A patent/CN103438420B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4870823A (en) * | 1988-11-30 | 1989-10-03 | Westinghouse Electric Corp. | Low load operation of steam turbines |
| CN101451709A (en) * | 2008-12-31 | 2009-06-10 | 柴庆宣 | Piping-main scheme boiler load coordinating control method |
| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
| CN103185333A (en) * | 2013-05-06 | 2013-07-03 | 安徽省电力科学研究院 | Method for coordinating and controlling quality change of coal in supercritical once-through boiler unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103438420A (en) | 2013-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10968784B2 (en) | Flexible coal-fired power generation system and operation method thereof | |
| CN203685322U (en) | Steam extraction heat supply system for 350MW supercritical heat supply unit | |
| CN109958593A (en) | A kind of solar energy fire coal couples flexible electricity generation system and operation method | |
| CN205717146U (en) | A kind of ultrahigh pressure coal gas boiler | |
| CN103574589B (en) | Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler | |
| CN109654471B (en) | Start recirculation system of supercritical boiler low-load flexibility operation | |
| CN104061027B (en) | The high temperature steam-extracting cooling system of Double reheat steam turbine thermodynamic system | |
| CN202338891U (en) | Natural circulation waste heat boiler | |
| CN106122938A (en) | A kind of can the double reheat system of power station boiler of homoiothermic flexibly | |
| CN207815281U (en) | The asynchronous load depth peak regulation system of thermal power plant unit steam turbine boiler | |
| CN103438420B (en) | Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube | |
| CN104421922A (en) | Modifying method for subcritical unit | |
| CN103727519B (en) | Device for preventing low-temperature corrosion of economizer heating surface | |
| CN104534442A (en) | Low mass flow speed ultra-supercritical boiler water circulation device and water circulation method | |
| WO2023221609A1 (en) | Boiler furnace with steam-cooled wall, and system | |
| CN201568952U (en) | Saturated steam reheating boiler | |
| CN204372879U (en) | A kind of two medium waste heat boiler | |
| CN103697451B (en) | A kind of high-temperature atmospheric steam generator | |
| CN203656895U (en) | Device for preventing low temperature corrosion on coal economizer heating surfaces | |
| CN202092089U (en) | Fire coal boiler unit | |
| CN203978523U (en) | The high temperature steam-extracting cooling system of Double reheat steam turbine thermodynamic system | |
| CN207080980U (en) | A kind of large-scale steam-water dual-purpose type boiler | |
| CN105299619A (en) | Novel efficient energy-saving superheat boiler | |
| CN207394797U (en) | A kind of refuse incineration exhaust-heating boiler | |
| CN207065547U (en) | A kind of biomass burning super-pressure resuperheat unit fluidized-bed combustion boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |