A real-time measurement method of flue gas temperature field at the furnace outlet and horizontal flue of a power station boiler

A boiler horizontal flue and furnace outlet technology, which is applied in the direction of boiler working status indication, electrical digital data processing, special data processing applications, etc., can solve the problem of low temperature measurement without correction, easy damage, and unsatisfactory furnaces in thermal power plants Outlet smoke temperature measurement requirements and other issues

CN105674237BInactive Publication Date: 2017-09-29西安西热电站信息技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-09-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a real-time measuring method for smoke temperature fields of a hearth outlet and a horizontal flue of a power station boiler. The real-time measuring method comprises the steps of constructing a multi-point three-dimensional measuring system, arranging a plurality of columns of smoke temperature measuring points on the horizontal flue of the boiler, and enabling the distance between each column of smoke temperature measuring points and a front / rear heated surface of each column of smoke temperature measuring points to be equal; and then, correcting the temperature acquired at each smoke temperature measuring point to be the smoke temperature of the hearth outlet of the boiler, and calculating the smoke temperature distribution of an inlet of each heated surface along the width direction according to the relation between a convection superheater in the horizontal flue and inlet smoke temperature distribution as well as outlet steam temperature distribution of each heated surface of the preheater. The online real-time measured value of the smoke temperature can be seen on a DCS picture of a centralized control center, and the online real-time measured value of the smoke temperature and the corrected smoke temperature value can be seen in the production process of an SIS page; and the distribution condition of the smoke temperature in the horizontal flue along the width and depth directions are approximately represented by smoke temperature fields on the sections of a fourth-stage superheater inlet, a second-stage reheater inlet and a vertical first-stage reheater inlet, so that the operation of the boiler can be conveniently monitored in real time, and furthermore the operation safety is ensured.
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Description

technical field

[0001] The invention belongs to the technical field of power station boiler monitoring, and relates to a method for real-time measurement of flue gas temperature fields at the furnace outlet of the power station boiler and the flue gas temperature field of the horizontal flue. Background technique

[0002] Furnace flue gas temperature, especially the flue gas temperature in the furnace outlet area, is a very critical parameter that needs to be monitored during the operation of power plant boilers. Realizing real-time and accurate temperature measurement of furnace flue gas is crucial to ensuring the safe operation of thermal power plants, improving unit economy and optimizing boilers. Design matters.

[0003] In the design of traditional thermal power plants, the smoke temperature probes (one set on the left and one on the left) are specified with the boiler as a means of measuring the smoke temperature at the furnace outlet. figure 1 shown. The smoke tempe...

Examples

Embodiment Construction

[0090] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0091] see figure 2 , a method for real-time measurement of flue gas temperature field at the furnace outlet of a utility boiler and a horizontal flue, comprising the following operations:

[0092] 1) Build a multi-point stereo measurement system:

[0093] Set up multiple rows of smoke temperature measuring points in the horizontal flue of the boiler: set up a row of equidistantly distributed smoke temperature measuring points at the rear of the third-stage superheater, the fourth-stage superheater, and the second-stage reheater respectively. The temperature measuring point is equidistant from the front and rear heating surfaces; the smoke temperature measuring point adopts armored thermocouples for temperature collection;

[0094] Further, see figure 2 , install 18 smoke temperature mea...