CN103528081B - A kind of water-cooling wall for thermal power plant concurrent boiler has difference to blow ash reduction thermal deviation method - Google Patents
A kind of water-cooling wall for thermal power plant concurrent boiler has difference to blow ash reduction thermal deviation method Download PDFInfo
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Abstract
Water-cooling wall for thermal power plant concurrent boiler has difference to blow an ash reduction thermal deviation method, it is characterized in that, comprises step 1, under the normal condition of described direct current cooker hearth combustion, be incorporated into by steam/water in the ash gun of described water-cooling wall; Step 2, utilizes the steam/water in described ash gun to have difference to blow ash to described water-cooling wall, to change the zones of different of described water-cooling wall, the superficial dust degree at position; According to the distribution density of described ash gun, be that monitoring point is circumferentially divided into several regions with outlet temperature by water screen tube, observe the outlet distribution of steam temperature of described water screen tube and deviation whether in rational scope: as the steam temperature in a certain region of water-cooling wall as described in need promoting, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, increase its blow grey intensity and/or reduce corresponding to the higher water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity; Vice versa.
Description
Technical field
The present invention relates to a kind of water-cooling wall and blow the method that ash reduces thermal deviation, particularly relating to a kind of water-cooling wall for thermal power plant concurrent boiler has difference to blow ash reduction thermal deviation method.
Background technology
At present, it is no matter the evaporating heating surface of subcritical pressure boiler or super (super-) critical pressure direct-flow boiler, especially variable-pressure operation, the evaporating heating surface of the direct current cooker with built-in start-up system, i.e. water-cooling wall, all there is flow stability, the hydrodynamic force such as thermal deviation and pulsation problem, especially the problem of thermal deviation, due to and the physical dimension of each pipe in tubulation group, internal drag coefficient and thermic load there are differences, therefore in each pipe, the enthalpy of working medium increases different, and causing the reason of thermal deviation can be summed up as three classes: heating surface varies in size, waterpower is uneven and heating power is uneven.For this reason, in boiler structure design, will consider to make the structural elements such as the length of each pipe in parallel and caliber as far as possible even, the layout of burner and combustion conditions will be considered to make furnace load distribute evenly as far as possible as far as possible.But be actually and be difficult to accomplish absolute uniform, and once design is fixed, uneven being in operation of its heating surface size, waterpower is difficult to adjust.And it is uneven for heating power, its influence factor existing structure factor also has operation factor, such as, in burner hearth, the thermic load of furnace wall, four sides itself may be different, deflection, the burner load at running Flame center are inconsistent, the serious dust stratification of burner hearth part water-cooling wall and slagging scorification etc., the heat absorption of water-cooling wall all can be caused uneven, finally cause the thermal deviation of water-cooling wall.
For direct current cooker, because working medium is all evaporated in water-cooling wall, water-cooling wall is once produce larger thermal deviation, very large impact can be caused to heat transfer deterioration, and water-cooling wall outlet Temperature of Working is overheated, so very large impact can be caused safely on water-cooling wall pipe, part water-cooling wall local overheating even booster seriously can be caused.In addition, the water-cooling wall of modern large-sized boiler all have employed fin structure, and temperature deviation larger between pipe just means great thermal stress, and serious meeting produces and tears and booster.But at present, for the thermal deviation of water-cooling wall, except the measure can considered in design, be in operation and be still short of for the good technological means of problems.
On the other hand, the ash that blows for furnace wall cooling is the operating routine operation of current Power Plant, but its main purpose is in order to avoid water-cooling wall slagging scorification or dust stratification, guarantee boiler operatiopn safety, so its soot-blowing mode adopted is generally timing blow ash, namely the operation personnel sometime that arrive will to perform and to blow ash manipulation, blow ash, and it is not used as a kind of technological means controlling water-cooling wall thermal deviation to furnace wall cooling is unified.
Summary of the invention
Because the defect of the problems referred to above and prior art, the present invention seeks to break through traditional soot-blowing mode and theory, reduce the thermal deviation of water-cooling wall, improve the hydrodynamic stability of boiler operatiopn.
For achieving the above object, the invention provides a kind of water-cooling wall for thermal power plant concurrent boiler has difference to blow ash reduction thermal deviation method, it is characterized in that, comprises the following steps:
Step 1, under the normal condition of described direct current cooker hearth combustion, is incorporated in the ash gun of described water-cooling wall by steam/water;
Step 2, utilizes the steam/water in described ash gun to have difference to blow ash to described water-cooling wall, to change the superficial dust degree of the zones of different of described water-cooling wall;
Wherein step 2 comprises step 3, according to the distribution density of described ash gun, be that monitoring point is circumferentially divided into several regions with outlet temperature by water screen tube, observe the outlet distribution of steam temperature of described water screen tube and deviation whether in rational scope: as the steam temperature in a certain region of water-cooling wall as described in need promoting, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, increase its blow grey intensity and/or reduce corresponding to the higher water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity; As the steam temperature in a certain region of water-cooling wall need be reduced, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, reduce its blow grey intensity and/or increase corresponding to the lower water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity.
Wherein said water screen tube around the region of the different wall of boiler respectively by burner hearth hot and cold, and is arranged in different metope and differing heights for the ash gun of the regional water cold wall pipe of burner hearth hot and cold.
Reduce in wherein said step 3 or increase the method for blowing grey intensity to blow the grey frequency for reducing or increasing.
Reducing in wherein said step 3 or increasing the method for blowing grey intensity is the steam/water pressure reducing or increase in described ash gun.
Adopt in wherein said step 3, on described boiler water wall, hydrodynamic force survey monitor is installed, monitored by hydrodynamic force survey monitor and determine described water-cooling wall thermal deviation.
Water-cooling wall for thermal power plant concurrent boiler of the present invention has difference to blow ash reduction thermal deviation method, also comprise step 4, described step 4 is judge that the coking of described water-cooling wall, dust stratification degree are whether within predetermined controlled range, and control coking, the dust stratification degree of water-cooling wall in step 2, make it within controlled range.
Water-cooling wall for thermal power plant concurrent boiler of the present invention has difference to blow ash reduction thermal deviation method, wherein also comprise step 5, described step 5 is controlling described water-cooling wall thermal deviation on the basis of zone of reasonableness, comprehensive descision overheating steam temperature, reheat steam temperature height, if need reheat steam temperature be promoted, then reduce on average to blow grey intensity to described water-cooling wall, namely total caloric receptivity of described water-cooling wall is reduced, otherwise, if need reheat steam temperature be reduced, then increase and grey intensity is on average blown to described water-cooling wall, namely increase total caloric receptivity of described water-cooling wall.
Water-cooling wall as claimed in claim 1 for thermal power plant concurrent boiler has difference to blow ash reduction thermal deviation method, and the quantity of wherein said ash gun is at least two.
The present invention blows ash by carrying out differentiation to furnace wall cooling, achieves beneficial effect:
1, grey intensity is blown by what have object to control ash gun on the corresponding diverse location in each region of water-cooling wall, to change the superficial dust degree in each region of water-cooling wall, thus promote the heat transfer coefficient of heating surface corresponding to outlet steam temperature region on the low side or reduce the heat transfer coefficient of heating surface corresponding to the outlet higher region of steam temperature, reach the object of each regional export steam temperature of balanced water-cooling wall, decrease each interregional thermal deviation of water-cooling wall, improve direct current cooker hydrodynamic stability, improve the security of unit operation;
2, by realizing the heat absorption ratio reallocation in each water-cooling wall region, decrease the temperature deviation that each water-cooling wall is interregional, decrease fluctuating range and the frequency of water-cooling wall outlet steam temperature, alleviate the impact of thermal stress that water-cooling wall metal pipe material produces because of the temperature difference and the alternate stress that frequent fluctuation produces, reduce water-cooling wall the local overheating even possibility of booster, substantially increase device security;
3, reducing the steam consumption/water consume produced because blindly blowing ash manipulation to lose, improve operational efficiency;
4, by adjusting variations in temperature in real time, decreasing and blowing ash manipulation, reducing heating surface produces blow loss probability because excessively blowing ash, improving device security further.
Be described further to the technique effect of design of the present invention, concrete steps and generation, to understand object of the present invention, characteristic sum effect fully below.
Detailed description of the invention
The invention provides a kind of difference steam soot blowing that has for thermal power plant concurrent boiler water-cooling wall and reduce thermal deviation method, specifically comprise the following steps:
Step 1, under the normal condition of described direct current cooker hearth combustion, is incorporated in the ash gun of described water-cooling wall by steam/water;
Step 2, utilizes the steam/water in described ash gun to have difference to blow ash to described water-cooling wall, to change the superficial dust degree of the zones of different of described water-cooling wall;
Wherein step 2 comprises step 3, according to the distribution density of described ash gun, be that monitoring point is circumferentially divided into several regions with outlet temperature by water screen tube, observe the outlet distribution of steam temperature of described water screen tube and deviation whether in rational scope: as the steam temperature in a certain region of water-cooling wall as described in need promoting, then utilize ash gun (the such as spiral water-cooling wall being arranged in diverse location corresponding to this regional water cold wall pipe whole process, same water screen tube can around the region of the different wall of boiler respectively by burner hearth hot and cold, and also can be arranged in different metope and differing heights for the ash gun of this regional water cold wall pipe) carry out blowing ash, increase its blow grey intensity and/or reduce corresponding to the higher water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity, as the steam temperature in a certain region of water-cooling wall need be reduced, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, reduce its blow grey intensity and/or increase corresponding to the lower water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity.
Cause the many factors of water-cooling wall thermal deviation, differentiated carrying out blows the coefficient of heat transfer that ash is in fact change water screen tube, and then changes caloric receptivity, realizes the equilibrium of steam temperature.Water-cooling wall dust stratification stains, and the water-cooling wall coefficient of heat transfer can be caused to reduce, and heat exchange amount reduces, and in the constant situation of other condition, water-cooling wall outlet steam temperature can reduce.When water-cooling wall dust stratification is blown down, the water-cooling wall coefficient of heat transfer increases, and heat exchange amount increases, and in the constant situation of other condition, water-cooling wall outlet steam temperature can increase.
Particularly, as the steam temperature of water-cooling wall a certain region pipe need be promoted, then utilize ash gun (the such as spiral water-cooling wall being arranged in diverse location corresponding to this regional water cold wall pipe whole process, same water screen tube can around the region of the different wall of boiler respectively by burner hearth hot and cold, and also can be arranged in different metope and differing heights for the ash gun of this regional water cold wall pipe) and carry out blowing ash, increasing it blows grey intensity; Or, reduce corresponding to the higher water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity, or, by increase corresponding to this regional water cold wall pipe whole process be arranged in the ash gun of diverse location blow grey intensity, these the two kinds of means of grey intensity of blowing being arranged in the ash gun of diverse location reduced corresponding to the higher water screen tube whole process of other outlet steam temperature combine.Reduce in wherein said step 3 or increase the method for blowing grey intensity to blow the grey frequency for reducing or increasing.Reduce in described step 3 or increase the method for blowing grey intensity also to can be the steam/water pressure reducing or increase in described ash gun.The quantity of wherein said ash gun is at least two.
The steam/water power that water-cooling wall integrally carries out adjusting is blown compared with gray technology with traditional, the present invention is directed to water-cooling wall each pipe heat absorption situation and carry out differentiation adjustment, what effectively accurately control water-cooling wall in real time blows grey intensity, the surface cleanness of water-cooling wall can be ensured in the reasonable scope, ensure that safety and the efficiency of boiler, additionally reduce water-cooling wall thermal deviation, improve the hydrodynamic stability of direct current cooker, reduce water-cooling wall the local overheating even possibility of booster, improve unit operation security.
Meanwhile, the present invention, while reduction water-cooling wall thermal deviation, can reduce to a certain extent and blow ash manipulation, reducing water wall surface produces blow loss probability because excessively blowing ash, improving device security further.In addition, by adjustment, fluctuating range and the frequency of the metal temperature of water-cooling wall can be reduced, alleviate metal pipe material produces the alternate stress of thermal stress and frequent fluctuation generation impact because of the temperature difference.
In better embodiment of the present invention, the water screen tube outlet distribution of steam temperature and deviation is observed whether in rational scope in wherein said step 3, can adopt, on boiler water wall, hydrodynamic force survey monitor is installed, monitored by hydrodynamic force survey monitor and determine the larger region of water-cooling wall thermal deviation.Zone of reasonableness refers in safe range, if steam temperature distributes and deviation is excessive, direct current cooker hydrodynamic force can be caused unstable, water-cooling wall metal pipe material overtemperature is the dangerous phenomenon such as booster even, can set different zone of reasonableness according to different situations such as unit capacity, metal pipe material materials.
In another preferred embodiment of the present invention, wherein also comprise step 4, described step 4 is judge that the coking of water-cooling wall, dust stratification degree are whether within predetermined controlled range, and controls coking, the dust stratification degree of water-cooling wall in step 2, makes it within controlled range.Controlled range refers in safe range, and coking, dust stratification can cause the heat absorption of water-cooling wall uneven, finally cause the thermal deviation of water-cooling wall, then causes direct current cooker hydrodynamic force unstable, and water-cooling wall metal pipe material overtemperature is the dangerous phenomenon such as booster even.
In another better embodiment of the present invention, the present invention also comprises step 5, in control water-cooling wall thermal deviation on the basis of zone of reasonableness, and comprehensive descision overheating steam temperature, reheat steam temperature height, especially reheat steam temperature will be taken into account, if need reheat steam temperature be promoted, then reduce on average to blow grey intensity to water-cooling wall, namely reduce total caloric receptivity of water-cooling wall, otherwise, if need reheat steam temperature be reduced, then increase and grey intensity is on average blown to water-cooling wall, namely increase total caloric receptivity of water-cooling wall.
Certainly, in other embodiments, also can not arrange above step, the present embodiment does not limit this.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff are in the art available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea, all in scope.
Claims (8)
1. the water-cooling wall for thermal power plant concurrent boiler has difference to blow an ash reduction thermal deviation method, it is characterized in that, comprises the following steps:
Step 1, under the normal condition of described direct current cooker hearth combustion, is incorporated in the ash gun of described water-cooling wall by steam/water;
Step 2, utilizes the steam/water in described ash gun to have difference to blow ash to described water-cooling wall, to change the superficial dust degree of the zones of different of described water-cooling wall;
Wherein step 2 comprises step 3, according to the distribution density of described ash gun, be that monitoring point is circumferentially divided into several regions with outlet temperature by water screen tube, observe the outlet distribution of steam temperature of described water screen tube and deviation whether in rational scope: as the steam temperature in a certain region of water-cooling wall as described in need promoting, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, increase its blow grey intensity and/or reduce corresponding to the higher water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity; As the steam temperature in a certain region of water-cooling wall need be reduced, then utilize this ash gun being arranged in diverse location corresponding to regional water cold wall pipe whole process to carry out blowing ash, reduce its blow grey intensity and/or increase corresponding to the lower water screen tube whole process of other outlet steam temperature be arranged in the ash gun of diverse location blow grey intensity.
2. there is difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, wherein said water screen tube around the region of the different wall of boiler respectively by burner hearth hot and cold, and is arranged in different metope and differing heights for the ash gun of the regional water cold wall pipe of described burner hearth hot and cold.
3. the water-cooling wall for thermal power plant concurrent boiler as claimed in claim 1 has difference to blow grey reduction thermal deviation method, and reducing in wherein said step 3 or increasing the method for blowing grey intensity is that the grey frequency is blown in minimizing or increase.
4. have difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, reducing in wherein said step 3 or increasing the method for blowing grey intensity is the steam/water pressure reducing or increase in described ash gun.
5. there is difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, adopt in wherein said step 3, on described boiler water wall, hydrodynamic force survey monitor is installed, monitored by hydrodynamic force survey monitor and determine described water-cooling wall thermal deviation.
6. there is difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, also comprise step 4, described step 4 is judge that the coking of described water-cooling wall, dust stratification degree are whether within predetermined controlled range, and control coking, the dust stratification degree of water-cooling wall in step 2, make it within controlled range.
7. there is difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, wherein also comprise step 5, described step 5 is controlling described water-cooling wall thermal deviation on the basis of zone of reasonableness, comprehensive descision overheating steam temperature, reheat steam temperature height, if need reheat steam temperature be promoted, then reduce on average to blow grey intensity to described water-cooling wall, namely total caloric receptivity of described water-cooling wall is reduced, otherwise, if need reheat steam temperature be reduced, then increase and grey intensity is on average blown to described water-cooling wall, namely increase total caloric receptivity of described water-cooling wall.
8. have difference to blow ash reduction thermal deviation method for the water-cooling wall of thermal power plant concurrent boiler as claimed in claim 1, the quantity of wherein said ash gun is at least two.
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| CN108006659A (en) * | 2017-12-18 | 2018-05-08 | 上海康恒环境股份有限公司 | The combined type deashing arrangement and method for arranging of a kind of garbage burning boiler |
| JP2019132515A (en) * | 2018-01-31 | 2019-08-08 | 三菱日立パワーシステムズ株式会社 | Suit blower operation control device, suit blower operation control method, and combustion system |
| CN109654519B (en) * | 2019-02-19 | 2020-06-23 | 中国神华能源股份有限公司 | Boiler soot blowing system and operation method thereof |
| JP7285685B2 (en) * | 2019-05-07 | 2023-06-02 | 三菱重工業株式会社 | Furnaces and boilers equipped therewith |
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