CN103574589A - Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler - Google Patents
Tube wall overtemperature control method for platen superheater in 1045-megawatt ultra supercritical boiler Download PDFInfo
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Abstract
The invention discloses a tube wall overtemperature control method for a platen superheater in a 1045-megawatt ultra supercritical boiler. Control processing steps of converting a wet sate to a dry state of the boiler and converting the dry state to the wet state of the boiler are executed, so that alternating fluctuation of parameters of the steam specific volume and the like in a dry state-wet state conversion process is smaller, and the flow deviation is reduced. Besides, the processing steps can be controlled through the operation state of the boiler, and controlling is performed before the wet state is converted to the dry state or the dry state is converted to the wet state, so that overtemperature influence factors of the platen superheater of the 1045-megawatt ultra supercritical boiler are avoided, overtemperature tube burst accidents of the platen superheater can be effectively prevented, the labor intensity of operation staff is reduced, and the safety and the economy of unit operation are improved.
Description
Technical field
The present invention relates to 1045 megawatts (MW) ultra-supercritical boiler technical field, in particular, the present invention relates to a kind of 1045 megawatt ultra-supercritical boiler pendant superheater overtemperature of tube wall control methods.
Background technology
Ultra supercritical unit is comparative maturity technically, and the technological progress of ultra supercritical unit of new generation is fairly obvious.Large-capacity ultra-supercritical boiler also has good startup operation and peaking performance, can meet the peak regulation requirement of network load, at present, in power plant, brought into use the ultra-supercritical boiler of 1045 megawatts, for example, the coal-fired Once-through Boiler of DG3033/26.15-II2 ultra supercritical parameter that Dongfang Boiler (Group) Co., Ltd. produces, for single burner hearth, opposed firing burning, a resuperheat, afterbody twin flue structure, adopt gas baffle to regulate reheat steam temperature, balanced draft, dry ash extraction, outdoor layout, full suspention, steel construction П type boiler, burner hearth horizontal cross-section is that 31433.4 * 15558.4mm(is wide * dark).
General, in 1045 megawatt ultra-supercritical boilers, superheater surface adopts radiation+convection to arrange, and mainly four parts, consist of, first is ceiling and rear vertical well gas flue wall and rear vertical shaft dividing wall; Second portion is the advection superheater being arranged in tail vertical well rear pass; Third part is the pendant superheater that is positioned at upper furnace; The 4th part is the finishing superheater that is positioned at furnace arch, furnace nose top.
For the pendant superheater that is arranged in upper furnace region, be generally to have arranged 2 rows in the dark direction of stove, between two row's screens, be close to layout, each comb screen is arranged 19 screens along stove cross direction, front and back are totally 38 screens.In actual moving process, pendant superheater as this 1045 megawatt ultra-supercritical boiler critical component, it is one of most important high-temperature surface in this boiler plant, due to its particularity of being heated---be both subject to convection heat transfer' heat-transfer by convection, raying is conducted heat again, so its residing environment is more severe, more easily causes overtemperature tube burst.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of 1045 megawatt ultra-supercritical boiler pendant superheater overtemperature of tube wall control methods, to avoid pendant superheater overtemperature tube burst accident, reduces operations staff's labour intensity, improves security and the economy of unit operation.
For addressing the above problem, the present invention adopts following technical scheme:
A control method for pendant superheater overtemperature of tube wall in 1045 megawatt ultra-supercritical boilers, this control method comprises following control step:
Step 11, when 1045 megawatt ultra-supercritical boiler unit loads reach 250 megawatt～300 megawatt hours, start the boiler hygrometric state state of becoming a cadre, become a cadre before state operation and boiler feedwater to be switched to main road by bypass to move and adjust feedwater flow the A/B/C valve of 361 valves cuts out one by one carrying out boiler hygrometric state; At boiler hygrometric state, become a cadre in state process, control provides stable feedwater flow, increase fuel quantity, monitoring intermediate point temperature, controls the degree of superheat between 5～15 ℃, wherein when water storage tank water level reduces, start to close 360 valves, when water storage tank water level is reduced to 5 meters, close 360 valves completely, stop boiler water cycle pump operation;
Step 12, when 1045 megawatt ultra-supercritical boiler loads are when 350 megawatts start load down, start boiler dry state and turn hygrometric state, turn before hygrometric state operation carrying out boiler dry state, from load is 350 megawatts, controls and reduce the intermediate point degree of superheat, the intermediate point degree of superheat is controlled in 10 ℃, when load is down to 300 megawatt scope, the intermediate point degree of superheat is down to 0 ℃ of scope, transfer a feed pump to stand-by state simultaneously; In boiler dry state, turn in hygrometric state process, control and subtract fuel, it is stable that control maintains boiler feedwater, when water tank starts water filling, closes the heating coil valve of boiler water circulating pump, 361 valves, opens boiler water circulating pump minimum discharge pipe valve, supercooling tube valve; When water storage tank water level rises to more than 6 meters, start boiler water circulating pump, by 360 valves, control water storage tank water level;
When boiler transfers to after hygrometric state operation, by feedwater flow, control water storage tank water level 10 meters of scopes, make 361 valves in closed condition.
As preferred embodiment, in above-mentioned steps 12, also comprise:
In the dry hygrometric state polling of boiler, if when boiler unit control model is turbine follow pattern, monitoring steam turbine pitch action aperture, and make boiler pressure stable according to boiler situation control excision turbine follow pattern.
As preferred embodiment, in above-mentioned steps 12, also comprise:
At boiler, transfer to after dry state, when boiler is when 300 megawatt～350 megawatt dry states are moved, control and reduce burner hearth cigarette temperature deviation; Control the intermediate point degree of superheat at 10 ℃ or below 10 ℃; Control maintains the required oxygen amount in combustion zone, orlop burner secondary air flow damper aperture is controlled to 75%～85%, the middle level burner secondary air flow damper aperture that puts into operation is controlled at 65%～75%, the upper strata burner secondary air flow damper aperture that puts into operation is controlled at 55%, after-flame wind aperture is controlled at more than 60% simultaneously.
As preferred embodiment, in above-mentioned steps 12, also comprise:
When boiler turns after hygrometric state operation, below 250 megawatt loads, boiler feedwater is switched to bypass by main road and moves.
As preferred embodiment, method of the present invention also comprises step 13: described 1045 megawatt ultra-supercritical boilers are controlled to maintain before turning hygrometric state and comprised that the boiler of burning, temperature or load is in stable condition carrying out become a cadre state or dry state of boiler hygrometric state.
Compared with prior art, the present invention has following beneficial effect:
In the present invention's 1045 megawatt ultra-supercritical boilers, in the control method of pendant superheater overtemperature of tube wall, by boiler hygrometric state is become a cadre state and boiler dry state, turn hygrometric state and carry out overtemperture control processing, can make the parameter alternation fluctuations such as steam specific volume in dry hygrometric state transfer process less, flow deviation reduces, in addition, in the present invention, in become a cadre state or dry state of boiler hygrometric state, also maintain before turning hygrometric state and comprise burning, the boiler of temperature or load is in stable condition, further avoided the influence factor of pendant superheater overtemperature, can effectively avoid pendant superheater overtemperature tube burst accident in 1045 megawatt ultra-supercritical boilers, reduce operations staff's labour intensity, improve security and the economy of unit operation.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment schematic diagram of the control method of pendant superheater overtemperature of tube wall in the present invention's 1045 megawatt ultra-supercritical boilers.
The specific embodiment
1045 megawatt ultra-supercritical boilers are in service, due to the impact of working medium physical characteristic, in the dry hygrometric state transfer process of Benson load, the parameter alternation fluctuations such as steam specific volume are larger, cause flow deviation aggravation between pipe, specifically, two particular stages of main experience in 1045 megawatt ultra-supercritical boiler variable load operations in the present invention: the one, boiler is the transition process to dry state operation by hygrometric state operation, be mainly reflected in water-cooling wall intraductal working medium under subcritical pressure boiler, by the larger steam water interface of vapor content, be converted to the dry saturated steam with certain micro-degree of superheat, in this stage, carbonated drink specific volume changes greatly, because assignment of traffic is uneven and working medium temperature is led coefficient and sharply declined, very easily cause the water-cooling wall heat transfer deterioration of burner region, affect thus the adjusting of water coal ratio, and then cause steam temperature to change or Temperature Deviation increase, thereby easily cause the pendant superheater pipe overtemperature that rear portion heating surface flow is relatively on the low side.The 2nd, steam parameter is crossed over critical point process, there is great variety in working medium thermal properties (specific volume, specific heat, temperature are led coefficient etc.), the easy overtemperature of the water-cooling wall of burner region not only, in pendant superheater, vapor (steam) temperature and specific volume also sharply change simultaneously, and even booster of overtemperature easily occurs.Therefore in boiler wet-dry state transfer process, must strictly control water coal ratio and superheater tube wall temperature, prevent even booster of the abnormal overtemperature of tube wall.For this reason, with reference to figure 1, the embodiment schematic diagram of the control method of pendant superheater overtemperature of tube wall in a kind of 1045 megawatt ultra-supercritical boilers of the present invention, this control method can comprise:
Step 11, is that the boiler hygrometric state state of becoming a cadre is controlled treatment step 11 in the present embodiment, specific as follows:
When this 1045 megawatt ultra-supercritical boiler unit load reaches 250 megawatt～300 megawatt hours, start the boiler hygrometric state state of becoming a cadre, become a cadre and boiler feedwater is switched to main road by bypass before state operation and moves carrying out boiler hygrometric state, and by adjusting feedwater flow, the A/B/C valve of 361 valves cuts out one by one, prevent that stove water from arranging outward;
When boiler hygrometric state is become a cadre in state process, control stable feedwater flow is provided, increase fuel quantity, detect intermediate point temperature, control the degree of superheat between 5～15 ℃; And at this boiler hygrometric state, become a cadre in state process, when water storage tank water level further reduces, start to close 360 valves, when water storage tank water level is reduced to 5 meters, close 360 valves completely, stop boiler water cycle pump operation.
Step 12 is that boiler dry state turns hygrometric state control treatment step 12 in the present embodiment:
When this 1045 megawatt ultra-supercritical boiler load is when 350 megawatts start down load down, start boiler dry state and turn hygrometric state; Carrying out before boiler dry state turns hygrometric state operation, from load is 350 megawatts, control and progressively reduce the intermediate point degree of superheat, the intermediate point degree of superheat is controlled in 10 ℃, wherein when load is down to 300 megawatt scopes (300 about megawatts), the intermediate point degree of superheat is down to near 0 ℃ of scope (0 ℃); Transfer a feed pump to stand-by state simultaneously;
And turn in hygrometric state process in boiler dry state, control and subtract steadily fuel, maintain boiler feedwater stable, intermediate point temperature continues to be reduced to below 0 ℃, water tank starts water filling, then close the heating coil valve of boiler water circulating pump, 361 valves, open boiler water circulating pump minimum discharge pipe valve, supercooling tube valve; Wherein, when water storage tank water level rises to more than 6 meters, start boiler water circulating pump, by 360 valves, control water storage tank water level;
When boiler transfers to after hygrometric state operation, by feedwater flow, control water storage tank water level in 10 meters of scopes (i.e. 10 meters of left and right), thereby make water tank liquid level adjust valve 361 valves in closed condition, avoid stove water to arrange outward;
In addition, need to illustrate, when boiler turns after hygrometric state operation, below 250 megawatts loads, boiler feedwater is switched to bypass by main road again and moves.
Needing explanation, above-mentioned boiler dry state to turn hygrometric state controls in treatment step 12 and also can comprise:
In dry hygrometric state polling, when if boiler unit control model is turbine follow pattern, need monitoring steam turbine pitch action aperture closely, prevent that too fast too fast, the main stripping temperature of main vapour pressure of boiler rise that causes of steam turbine pitch closing motion from going up too fast, cause steam temperature, wall temperature overtemperature, according to boiler state, also can control excision turbine follow pattern when needed, maintain steam pressure stable.
In addition, above-mentioned boiler dry state turns hygrometric state and controls in treatment step 12 and also can comprise:
At boiler, transfer to after dry state, when in 300 megawatt～350 megawatt dry state stable operation, control and reduce burner hearth cigarette temperature deviation; Control the intermediate point degree of superheat at 10 ℃ or below 10 ℃, prevent over 20 ℃; Guarantee that combustion zone oxygen amount is abundant, orlop burner secondary air flow damper aperture is controlled to 75%～85%, the middle level burner secondary air flow damper aperture that puts into operation is controlled at 65%～75%, the upper strata burner secondary air flow damper aperture that puts into operation is controlled at 55%, after-flame wind aperture is controlled at more than 60% simultaneously.
Need to illustrate, the 1045 megawatt ultra-supercritical boiler hygrometric states state that state or dry state turn before hygrometric state of becoming a cadre also may affect pendant superheater overtemperature, for this reason, the method of the present embodiment also can comprise step 13, in the present embodiment, be that boiler operatiopn state is controlled treatment step 13, to be mainly 1045 megawatt ultra-supercritical boilers control to maintain before turning hygrometric state and comprise that the boiler of burning, temperature or load is in stable condition carrying out become a cadre state or boiler dry state of boiler hygrometric state this step, then just carries out boiler transition operation.
With reference to figure 1, need to illustrate, in the present invention, above-mentioned steps 11-step 13 can be controlled the whole execution of carrying out or select, wherein saidly select an execution and refer to and select one of them step to carry out separately, can reach separately the effect of 1045 megawatt ultra-supercritical boiler pendant superheater overtemperture control, and integral body described in the present invention is carried out and is referred to the employing that can walk abreast of each step, for example, for step 11, step 12, step 13, can executed in parallel in the situation that not causing conflict, but not to be defined as each step to carry out and must carry out at one time or be defined as each step and must go to carry out according to a definite sequence, when wherein certain several step of selecting all can perform step, carry out and also refer to the employing that can walk abreast, belong to whole a kind of embodiment of carrying out, when in the present invention, integral body is carried out, if can reach the effect of better overtemperture control in the situation that each step is not conflicted mutually, here repeat no more.
Although preferred embodiment of the present invention has disclosed as above, the present invention is not limited to above-described embodiment, and any those skilled in the art, within not departing from the disclosed scope of the present invention, when doing a little change and adjustment.
Claims (5)
1. a control method for pendant superheater overtemperature of tube wall in 1045 megawatt ultra-supercritical boilers, is characterized in that, this control method comprises following control step:
Step 11, when 1045 megawatt ultra-supercritical boiler unit loads reach 250 megawatt～300 megawatt hours, start the boiler hygrometric state state of becoming a cadre, become a cadre before state operation and boiler feedwater to be switched to main road by bypass to move and adjust feedwater flow the A/B/C valve of 361 valves cuts out one by one carrying out boiler hygrometric state; At boiler hygrometric state, become a cadre in state process, control provides stable feedwater flow, increase fuel quantity, monitoring intermediate point temperature, controls the degree of superheat between 5～15 ℃, wherein when water storage tank water level reduces, start to close 360 valves, when water storage tank water level is reduced to 5 meters, close 360 valves completely, stop boiler water cycle pump operation;
Step 12, when 1045 megawatt ultra-supercritical boiler loads are when 350 megawatts start load down, start boiler dry state and turn hygrometric state, turn before hygrometric state operation carrying out boiler dry state, from load is 350 megawatts, controls and reduce the intermediate point degree of superheat, the intermediate point degree of superheat is controlled in 10 ℃, when load is down to 300 megawatt scope, the intermediate point degree of superheat is down to 0 ℃ of scope, transfer a feed pump to stand-by state simultaneously; In boiler dry state, turn in hygrometric state process, control and subtract fuel, it is stable that control maintains boiler feedwater, when water tank starts water filling, closes the heating coil valve of boiler water circulating pump, 361 valves, opens boiler water circulating pump minimum discharge pipe valve, supercooling tube valve; When water storage tank water level rises to more than 6 meters, start boiler water circulating pump, by 360 valves, control water storage tank water level;
When boiler transfers to after hygrometric state operation, by feedwater flow, control water storage tank water level 10 meters of scopes, make 361 valves in closed condition.
2. method according to claim 1, is characterized in that, in above-mentioned steps 12, also comprises:
In the dry hygrometric state polling of boiler, if when boiler unit control model is turbine follow pattern, monitoring steam turbine pitch action aperture, and make boiler pressure stable according to boiler situation control excision turbine follow pattern.
3. method according to claim 1, is characterized in that, in above-mentioned steps 12, also comprises:
At boiler, transfer to after dry state, when boiler is when 300 megawatt～350 megawatt dry states are moved, control and reduce burner hearth cigarette temperature deviation; Control the intermediate point degree of superheat at 10 ℃ or below 10 ℃; Control maintains the required oxygen amount in combustion zone, orlop burner secondary air flow damper aperture is controlled to 75%～85%, the middle level burner secondary air flow damper aperture that puts into operation is controlled at 65%～75%, the upper strata burner secondary air flow damper aperture that puts into operation is controlled at 55%, after-flame wind aperture is controlled at more than 60% simultaneously.
4. method according to claim 1, is characterized in that, in above-mentioned steps 12, also comprises:
When boiler turns after hygrometric state operation, below 250 megawatt loads, boiler feedwater is switched to bypass by main road and moves.
5. method according to claim 1, is characterized in that, also comprises step 13: described 1045 megawatt ultra-supercritical boilers are controlled to maintain before turning hygrometric state and comprised that the boiler of burning, temperature or load is in stable condition carrying out become a cadre state or dry state of boiler hygrometric state.
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| CN108954283A (en) * | 2018-06-26 | 2018-12-07 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
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Cited By (8)
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| CN104913287A (en) * | 2015-06-01 | 2015-09-16 | 广东红海湾发电有限公司 | Control method for preventing great amount of water from entering superheater during startup and shutdown of once-through boiler |
| CN105135415A (en) * | 2015-09-11 | 2015-12-09 | 云南电力试验研究院(集团)有限公司 | Automatic control method for dry state and wet state conversion of supercritical unit |
| CN108954283A (en) * | 2018-06-26 | 2018-12-07 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
| CN108954283B (en) * | 2018-06-26 | 2019-10-29 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
| CN109253442A (en) * | 2018-09-12 | 2019-01-22 | 国电南京电力试验研究有限公司 | One kind is become a cadre state control method |
| CN110966589A (en) * | 2019-12-04 | 2020-04-07 | 国网浙江省电力有限公司电力科学研究院 | Bypass system for reducing dry-wet critical load point of supercritical unit and operation method |
| CN110966589B (en) * | 2019-12-04 | 2021-08-03 | 国网浙江省电力有限公司电力科学研究院 | Bypass system for reducing dry-wet critical load point of supercritical unit and operation method |
| CN113282034A (en) * | 2021-05-12 | 2021-08-20 | 江苏大唐国际吕四港发电有限责任公司 | Peak regulation method of ultra-supercritical thermal power generating unit |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |