CN105066095A - Waste heat boiler water circulation design and calculation method - Google Patents
Waste heat boiler water circulation design and calculation method Download PDFInfo
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- CN105066095A CN105066095A CN201510447189.3A CN201510447189A CN105066095A CN 105066095 A CN105066095 A CN 105066095A CN 201510447189 A CN201510447189 A CN 201510447189A CN 105066095 A CN105066095 A CN 105066095A
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- resistance
- heat boiler
- waste heat
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- tedge
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Abstract
The invention provides a waste heat boiler water circulation design and calculation method, and relates to the technical field of design and calculation of industrial boilers and gas boilers. The method includes the calculation steps that firstly, project information is managed; secondly, evaporation space of a waste heat boiler is divided into meshes according to the evaporation amount, and each mesh is calculated; thirdly, unknown vectors such as inner diameters, numbers, lengths, arrangement modes and circulation ratios of ascending pipes and descending pipes are supposed, and related parameters are input to an Excel form; fourthly, the total resistance of the descending pipes is calculated according to the three pieces of supposed circulation power; fifthly, the total resistance of the ascending pipes is calculated according to the supposed three circulation ratios; sixthly, an effective pressure head of a loop is calculated; and seventhly, a hydraulic power performance characteristic curve is drawn, and circulation system parameters are determined. The situation that when the evaporation rate is too high in the large evaporation space and boiler water supply is not timely, overburning and pipe explosions happen to furnace tubes can be effectively eliminated.
Description
Technical field
The present invention relates to Industrial Boiler, gas fired-boiler designing and calculating technical field, be specifically related to waste heat boiler water circulation design and calculation method.
Background technology
The waste heat boiler used both at home and abroad now, steam pressure all selects Natural Circulation form at the usual of below 16MPa, because Natural Circulation form structure is simple, safe and reliable; Natural circulation boiler relies on the density contrast of medium (water and steam water interface) in down-comer and tedge and formed and circulate.Density contrast is larger, and the operating mode circulated is better.Although the business efficiency impact of water circulation on Waste Heat System is not very large, to the safe operation of waste heat boiler, stable operation, increase the service life important in inhibiting.If the flow operating mode of water circulation is bad, be easy to cause boiler tube burning to cause pipe explosion accident.Therefore, water circulation calculation must be carried out to boiler in boiler design process.
At present, China's most of waste heat boiler water circulation calculation method adopts approximate method to calculate, simplify by system, after manually computing out flow head, all assign to each rising, down-comer by approximate for whole evaporation capacity, namely the flow of every root rising, down-comer is identical, then carries out drag evaluation, finally draw averaging loop multiplying power, then tedge, down-comer layout are carried out uniform.This computational methods easily cause large evaporating space, and because evaporation rate is too fast, boiler feedwater is too late, causes the problem of boiler tube burning booster.
Summary of the invention
The object of the invention is to the defect for prior art and deficiency, a kind of waste heat boiler water circulation design and calculation method reasonable in design is provided, boiler feedwater is too late because evaporation rate is too fast effectively can to solve large evaporating space, causes the situation of boiler tube burning booster.
For achieving the above object, the technical solution used in the present invention is: its calculation procedure is as follows:
One: Consolidation Project information: find waste heat boiler service condition, try to achieve waste heat boiler specification, drum specification, operating pressure, gas production and flow head vertical height etc. required in water circulation calculation by calculating; And relevant parameter is input in Excel form;
Two: by evaporation capacity, stress and strain model is carried out to waste heat boiler evaporating space, each grid is calculated;
Three: assuming that unknown amount: as the internal diameter of tedge and down-comer, quantity, length, arrangement form and circulating ratio; And relevant parameter is input in Excel form;
Four: the drag overall calculating down-comer respectively by three circulating ratios of supposition: the drag overall of down-comer mainly comprises on-way resistance and local resistance two parts, the drag overall calculating down-comer solves on-way resistance and local resistance exactly;
Five: the drag overall calculating tedge respectively by three circulating ratios of supposition: tedge drag overall not only comprises on-way resistance and local resistance, also comprise the resistance of separator in the resistance of raising section and drum, therefore for solving tedge drag overall, the resistance of separator in on-way resistance, local resistance, the resistance of raising section and drum must be solved;
Six: counter circuit effective head: loop effective head is the difference of loop flow pressure head and tedge drag overall.Because tedge drag overall is tried to achieve in step 4, thus in step 5 a demand solution loop flow pressure head;
Seven: draw waterpower characteristic working curve, determine circulatory system parameter.Drawing by result of calculation with circulating ratio is abscissa, and resistance is two waterpower characteristic working curves of ordinate.According to the point of intersection of the effective head curve in down-comer drag overall curve and loop in the known waterpower characteristic working curve of natural circulation waste-heat boiler water circulation system principle, be natural cycle system flow head and resistance balance point.
Operation principle of the present invention: it utilizes the hydrodynamics of Excel office software to natural circulation waste-heat boiler water circulation system to calculate, by evaporation capacity size, stress and strain model is carried out to waste heat boiler evaporator section, can image each grid of drafting in hydraulic characteristic(s) working curve, guarantee that every section of (particularly high evaporation intensity section) safe water circulation is reliable, find suitable flow head and resistance balance point based on Natural Circulation general principle, can rise according to result of calculation reasonable Arrangement waste heat boiler, the layout of down-comer, specification and quantity, also can effectively check by waste heat boiler water circulation system in load fluctuation situation, the solution that the water circulation problem existed is suitable with searching, utilize the feature of Excel office software, change a known quantity, the value of all to be asked amounts relevant to this known quantity all can change, hydraulic characteristic(s) working curve also changes simultaneously, the method solves interative computation processes a large amount of in manual calculation method, improve computational efficiency, result of calculation and figure perfect adaptation can be made in addition, make result of calculation very clear.
The present invention is not only applicable to inside do not have the waste heat boiler of deflection plate or other larger resistance elements to be also applicable to the waste heat boiler that there is larger resistance element inside, when there is larger resistance element waste heat boiler inside, can according to the structural shape of different resistance element and layout type, analogue simulation resistance coefficient, certainty annuity resistance.
Beneficial effect of the present invention is:
1, solve the problem that a large amount of iteration of artificial computational process recalculates, add operating efficiency;
2, solve the water circulation system fault that approximate calculation in the past causes, particularly large evaporation intensity space is because boiler feedwater is not as good as the boiler tube burning booster phenomenon caused;
3, result of calculation chart display, simple and clear;
4, can be applicable at Industrial Boiler, gas fired-boiler etc.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is waterpower characteristic working curve figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Shown in Fig. 1, the technical scheme that this detailed description of the invention adopts is: its calculation procedure is as follows:
One: Consolidation Project information: find waste heat boiler service condition, try to achieve waste heat boiler specification, drum specification, operating pressure, gas production and flow head vertical height etc. required in water circulation calculation by calculating; And relevant parameter is input in Excel form;
Two: by the size of evaporation capacity, stress and strain model is carried out to waste heat boiler evaporating space, evaporating space can be divided into some sections by evaporation capacity, every section of effective head Δ P calculating loop under different operating mode respectively
gwith down-comer resistance Δ P
x.
Three: assuming that unknown amount: as the internal diameter of tedge and down-comer, quantity, length, arrangement form and circulating ratio; And relevant parameter is input in Excel form;
Four: the drag overall calculating down-comer respectively by three circulating ratios of supposition: the drag overall of down-comer mainly comprises on-way resistance and local resistance two parts, the drag overall calculating down-comer solves on-way resistance and local resistance exactly;
Five: the drag overall calculating tedge respectively by three circulating ratios of supposition: tedge drag overall not only comprises on-way resistance and local resistance, also comprise the resistance of separator in the resistance of raising section and drum, therefore for solving tedge drag overall, the resistance of separator in on-way resistance, local resistance, the resistance of raising section and drum must be solved;
Six: counter circuit effective head: loop effective head is the difference of loop flow pressure head and tedge drag overall.Because tedge drag overall is tried to achieve in step 4, thus in step 5 a demand solution loop flow pressure head;
Seven: draw waterpower characteristic working curve, determine circulatory system parameter: according to result of calculation draw with circulating ratio K be abscissa, down-comer drag overall Δ P
xtwo waterpower characteristic working curves with the effective head Δ Pg in loop is ordinate, are respectively K-Δ P
xcurve and K-Δ P
gcurve, according to natural circulation waste-heat boiler water circulation system principle, two curve intersections are in a point, and under this point represents this circulating ratio, flow head and the SR of system reach equalization point, and water circulation system can be run safely and effectively.
The operation principle of this detailed description of the invention: it utilizes the hydrodynamics of Excel office software to natural circulation waste-heat boiler water circulation system to calculate, by evaporation capacity size, stress and strain model is carried out to waste heat boiler evaporator section, can image each grid of drafting in hydraulic characteristic(s) working curve, guarantee that every section of (particularly high evaporation intensity section) safe water circulation is reliable, find suitable flow head and resistance balance point based on Natural Circulation general principle, can rise according to result of calculation reasonable Arrangement waste heat boiler, the layout of down-comer, specification and quantity, also effectively can check in the water circulation problem existed in load fluctuation situation by waste heat boiler water circulation system and find suitable solution, utilize the feature of Excel office software, change a known quantity, the value of all to be asked amounts relevant to this known quantity all can change, hydraulic characteristic(s) working curve also changes simultaneously, the method solves interative computation processes a large amount of in manual calculation method, improve computational efficiency, result of calculation and figure perfect adaptation can be made in addition, make result of calculation very clear.
The beneficial effect of this detailed description of the invention: boiler feedwater is too late because evaporation rate is too fast effectively can to solve large evaporating space, causes the situation of boiler tube burning booster.
The above, only in order to technical scheme of the present invention to be described and unrestricted, other amendment that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (1)
1. waste heat boiler water circulation design and calculation method, is characterized in that: its calculation procedure is as follows:
(1): Consolidation Project information: find waste heat boiler service condition, waste heat boiler specification, drum specification, operating pressure, gas production and flow head vertical height etc. required in water circulation calculation are tried to achieve by calculating; And relevant parameter is input in Excel form;
(2): by evaporation capacity, stress and strain model is carried out to waste heat boiler evaporating space, each grid is calculated;
(3): assuming that unknown amount: as the internal diameter of tedge and down-comer, quantity, length, arrangement form and circulating ratio; And relevant parameter is input in Excel form;
(4): the drag overall calculating down-comer respectively by three circulating ratios of supposition: the drag overall of down-comer mainly comprises on-way resistance and local resistance two parts, the drag overall calculating down-comer solves on-way resistance and local resistance exactly;
(5): the drag overall calculating tedge respectively by three circulating ratios of supposition: tedge drag overall not only comprises on-way resistance and local resistance, also comprise the resistance of separator in the resistance of raising section and drum, therefore for solving tedge drag overall, the resistance of separator in on-way resistance, local resistance, the resistance of raising section and drum must be solved;
(6): counter circuit effective head: loop effective head is the difference of loop flow pressure head and tedge drag overall, because tedge drag overall is tried to achieve in step 4, thus in step 5 a demand solution loop flow pressure head;
(7): draw waterpower characteristic working curve, determine circulatory system parameter, drawing by result of calculation with circulating ratio is abscissa, resistance is two waterpower characteristic working curves of ordinate, according to natural circulation waste-heat boiler water circulation system principle, the point of intersection of the effective head curve in down-comer drag overall curve and loop in known waterpower characteristic working curve, is natural cycle system flow head and resistance balance point.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07293803A (en) * | 1994-04-22 | 1995-11-10 | Mitsubishi Heavy Ind Ltd | Control device for boiler circulation pump |
| CN101493861A (en) * | 2009-01-15 | 2009-07-29 | 哈尔滨工业大学 | Hydrodynamic numerical implementation for natural circulation boiler |
| CN103353104A (en) * | 2012-10-10 | 2013-10-16 | 北京巴布科克·威尔科克斯有限公司 | Design method of low mass flow velocity water circulation system for opposed firing boiler |
| CN103604114A (en) * | 2013-11-25 | 2014-02-26 | 广东电网公司电力科学研究院 | Rapid water feeding stabilization control method based on boiler water circulation online monitoring system |
-
2015
- 2015-07-27 CN CN201510447189.3A patent/CN105066095A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07293803A (en) * | 1994-04-22 | 1995-11-10 | Mitsubishi Heavy Ind Ltd | Control device for boiler circulation pump |
| CN101493861A (en) * | 2009-01-15 | 2009-07-29 | 哈尔滨工业大学 | Hydrodynamic numerical implementation for natural circulation boiler |
| CN103353104A (en) * | 2012-10-10 | 2013-10-16 | 北京巴布科克·威尔科克斯有限公司 | Design method of low mass flow velocity water circulation system for opposed firing boiler |
| CN103604114A (en) * | 2013-11-25 | 2014-02-26 | 广东电网公司电力科学研究院 | Rapid water feeding stabilization control method based on boiler water circulation online monitoring system |
Non-Patent Citations (2)
| Title |
|---|
| 李俊等: "工业锅炉自然循环水动力计算方法的建议(一)", 《工业锅炉》 * |
| 袁良义等: "应用EXCEL进行自然循环热水锅炉水动力计算", 《江苏锅炉》 * |
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Application publication date: 20151118 |