A method for obtaining the inlet and outlet temperatures of each superheater of main steam based on desuperheating water volume
A technology of inlet temperature and outlet temperature, which is used in the direction of steam superheat, superheat temperature control, steam generation, etc.
Inactive Publication Date: 2021-03-26
JILIN UNIV
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[0003] Boiler design includes the thermal calculation of each heating surface, including the preliminary estimation and later verification of the steam temperature at the inlet and outlet of each heating surface. Some current patents and documents are basically aimed at the measurement and control of the temperature of each heating surface They are all based on actual operation and experience, and online adjustments have not fundamentally solved the problem of accurate calculation of the main steam temperature
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[0131] The specific implementation manner of this patent will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate this patent, but not to limit the scope of this patent.
[0132] Design of a 1000t / h subcritical natural circulation power plant boiler, the main technical parameters of the boiler are as follows;
[0133] Boiler rated evaporation: D=1000t / h, superheated steam pressure (absolute pressure) p=16.7MPa, superheated steam temperature: t=555℃, feed water temperature: t gs = 260°C.
[0134] Such as figure 1As shown, a power plant boiler heating surface layout diagram, including furnace 1, drum 2, low-temperature superheater 3, front panel superheater 4, rear panel superheater 5, high-temperature superheater cold section 6, high-temperature superheater hot section 7 , Low temperature economizer 8, high temperature economizer 9, water wall 10.
[0135] The boiler feed water ent...
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The invention discloses a method for acquiring inlet and outlet temperatures of main steam superheaters based on the temperature reduction water amount. The method comprises the following steps: step1, acquiring a boiler rated evaporation amount D, a superheated steam temperature t DEG C, a superheated steam pressure PMPa and a boiler feed water temperature tgs DEG C; step 2, determining the inlet and outlet pressures of all sections; step 3, acquiring the saturation temperature tqb of steam under the steam pocket pressure, wherein the hot section outlet temperature tggr'' of a high-temperature superheater meets a formula as follows: tggr'': tggr''= t, and the hot section inlet temperature tggr' of the high-temperature superheater meets a formula as follows: tggr'= tggr''- delta t2, in the formula, delta t2 is the temperature rise of each stage of superheater and meets a formula as follows: delta t2= delta t1 / 5, delta t1 is the total temperature rise of the steam in all stages of superheaters, and delta t1= t- tqb; and step 4, acquiring the hot section inlet enthalpy value hggr' of the high-temperature superheater according to the inlet pressure pggr' and the inlet temperature tggr' of the hot section of the high-temperature superheater, and acquiring the feed water enthalpy value hgs according to the feed water temperature tgs and the feed water pressure Pgs; and acquiring the cold section outlet enthalpy value hggl'' of the high-temperature superheater, wherein Djw3 is a third-stage temperature reduction water spraying amount in a formula as follows: hggl'': hggr' D= hggl'' (D- Djw3)+ hgsDjw3; and acquiring the cold section outlet temperature tggl'' of the high-temperature superheater according to the cold section outlet enthalpy value hggl'' and the pressure pggl' of the high-temperature superheater.
Description
technical field [0001] The invention relates to the technical field of power plant boiler design, and more specifically, the invention relates to a method for obtaining the inlet and outlet temperatures of each superheater of main steam based on desuperheating water volume. Background technique [0002] With the advancement of science and technology and the further expansion of professional fields, the former Soviet boiler design model can no longer adapt to the development situation of the new era. Therefore, the boiler design in recent years refers to the practical experience and the manufacturing mode of developed countries such as Europe, America and Japan, and comprehensively considers the experience of all parties to design and arrange the boiler unit. [0003] Boiler design includes the thermal calculation of each heating surface, including the preliminary estimation and later verification of the steam temperature at the inlet and outlet of each heating surface. Some ...
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IPC IPC(8): F22G5/12F22G5/20
CPCF22G5/12F22G5/20
Inventor 江彦李明黄海珍王永珍蒋志鹏
Owner JILIN UNIV