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Method for acquiring thermal performance of oxygen-enriched combustion boiler

A technology of oxygen-enriched combustion and thermal performance, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., and can solve problems such as not being able to adapt to new oxygen-enriched combustion boilers

Active Publication Date: 2014-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a thermal performance acquisition method, the purpose of which is to design a set of thermal performance acquisition methods for combustion boilers with an oxygen-enriched combustion atmosphere, thereby solving the current problem of boiler thermal performance acquisition The method cannot adapt to the technical problems of the new type oxygen-enriched combustion boiler

Method used

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  • Method for acquiring thermal performance of oxygen-enriched combustion boiler

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Effect test

Embodiment 1

[0168] The method for checking the thermal performance of the oxygen-enriched combustion boiler provided by the present invention checks the cold-dry cycle type oxygen-enriched combustion boiler:

[0169] The boiler to be checked is a cold-dry circulation type oxygen-enriched combustion boiler. Design requirements: see "Boiler Thermal Calculation Standard" (1973 Edition)

[0170] See Table 1 for the operating parameters of the boiler to be checked; see Table 2 for the coal quality parameters.

[0171] Table 1 Boiler operating parameters

[0172] Maximum continuous evaporation

t / h

695

Superheater outlet steam pressure

MPa.(a)

13.4

Superheater outlet steam temperature

℃

538

Reheat steam flow

t / h

595

Reheater inlet steam pressure

MPa.(a)

3

Reheater inlet steam temperature

℃

331

Reheater outlet steam pressure

MPa.(a)

2.85

Reheater outlet steam temperature

℃

53...

Embodiment 2

[0181] For the design requirements of the cold-dry circulation type oxygen-enriched combustion boiler, see step (1); the calculation results are as follows,

[0182] Under the oxygen-enriched combustion cold-wet cycle atmosphere, the value of cycle rate is 0.710; the purity of oxygen in the air separation system is 98%; the peroxygen coefficient is 1.2; the leakage coefficient is 0.015; the water vapor content after condensation is 4%; The proportion of hot air is 0.7; the proportion of primary air oxygen injection is 18%.

[0183] Initialized flue gas volume: 7.613Nm 3 / kg, number of iterations: 500; calculation result: smoke volume V 1 : 6.223Nm 3 / kg; smoke emission 1.331Nm 3 / kg; circulating flue gas volume 4.417Nm 3 / kg; primary air volume of assisted gas 1.336Nm 3 / kg; gas secondary air volume 4.399Nm 3 / kg; air supply volume of air separation unit V kf : 1.318Nm 3 / kg

Embodiment 3

[0185] Under the oxygen-enriched combustion thermal cycle atmosphere, the cycle rate value is 0.678; the oxygen purity of the air separation system is 97.5%; the oxygen peroxide coefficient is 1.05; the leakage coefficient is 0.01; the water vapor content after condensation is 3%; the primary air share is 0.266; the hot air in the primary air The share is 0.7; the proportion of primary air oxygen injection is 18%.

[0186] Initialized flue gas volume: 7.613Nm 3 / kg, number of iterations: 500; calculation result: smoke volume V 1 : 5.523Nm 3 / kg; smoke emission 1.291Nm 3 / kg; circulating flue gas volume 3.742Nm 3 / kg; primary air volume of assisted gas 1.337Nm 3 / kg; gas secondary air volume 3.681Nm 3 / kg; air supply volume of air separation unit V kf of: 1.276Nm 3 / kg.

[0187] The thermal calculation of each heating surface is as follows: panel superheater: error is -1.02%; convection superheater: error is -0.34%; reheater: error is 0.25%; economizer: error is...

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Abstract

The invention discloses a method for acquiring the thermal performance of an oxygen-enriched combustion boiler. The method comprises the steps of combustion calculation of fuel, simulation of flue gas and air supply, thermal balance calculation, hearth thermal calculation and convection heating surface thermal calculation, wherein the hearth thermal calculation consists of a flame blackness calculation step and a hearth blackness calculation step, the convection heating surface thermal calculation consists of a flue gas blackness calculation step and a flue gas side radiation heating coefficient determination step. A triatomic gas radiation attenuation coefficient ky is calculated according to a formula specified in the specifications, wherein PH2O is the H2O partial pressure in flue gas, S is the effective thickness of a radiating layer, and epsilon is a triatomic gas emission rate. By adopting the method for acquiring the thermal performance of the oxygen-enriched combustion boiler, the thermal performance of the oxygen-enriched combustion boiler is acquired more accurately, and the accuracy can meet the requirements on design as well as check of the thermal performance of the oxygen-enriched combustion boiler.

Description

technical field [0001] The invention belongs to the field of boiler thermal performance design, and more specifically relates to a method for correcting the thermal performance of an oxygen-enriched combustion boiler. Background technique [0002] During the boiler design process, it is necessary to obtain the thermal performance of the boiler, so as to carry out hydrodynamic design, pressure component strength design, ventilation resistance design, furnace wall thermal design, tube wall temperature design, pulverizing system design, aerodynamic design, etc., boiler The thermal performance data of the boiler is the core of the overall design of the boiler and the basic basis for the design, calibration and operation of the boiler. [0003] The boiler performance acquisition process is usually based on a given boiler, starting from the calculation of fuel combustion, the boiler flue gas and air supply simulation is carried out to perform heat balance calculation, and the furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 张立麒丁继伟朱海跃易宝军柳朝晖毛志慧郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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