Boiler close-to-wall air device and method based on burner near-wall atmosphere soft measurement

A wall-adhering wind and burner technology is applied in the field of boiler combustion, which can solve the problems of complex equipment, large investment, and damage to measuring components of the real-time monitoring system for atmosphere near the wall, achieving significant technical and economic benefits, simple and reasonable system structure, Ease of retrofit implementation

Pending Publication Date: 2021-05-11
宁夏枣泉发电有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method still has limitations: (1) The near-wall atmosphere real-time monitoring system has complex equipment and large investment. For example, a set of near-wall atmosphere real-time monitoring system with more than ten measuring points costs more than two million yuan
(2) The sampling and measuring point is located in the area w

Method used

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  • Boiler close-to-wall air device and method based on burner near-wall atmosphere soft measurement
  • Boiler close-to-wall air device and method based on burner near-wall atmosphere soft measurement
  • Boiler close-to-wall air device and method based on burner near-wall atmosphere soft measurement

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as Figure 1-Figure 6 As shown, the boiler close-to-wall wind device based on the soft measurement of the atmosphere near the wall of the burner includes the close-to-wall wind nozzle 1 , the near-wall atmosphere sampling tube 2 , the burner 3 and the furnace 4 . A boiler whose front and rear walls are opposed, add 2-5 layers of wall-mounted air nozzles 1 on the front and rear walls near the burner at the bottom of the furnace 4, and set the near-wall atmosphere sampling tube 2 on the side wall of the furnace 4.

[0056] As a preferred embodiment, the near-wall atmosphere sampling tube 2 is installed on the left and right side walls of the furnace 4, and its height is located in the middle and upper part of the burner area. It is made of heat-resistant stainless steel and installed on the fins of the water wall. 20mm, 2-4 layers in total. The near-wall atmosphere sampling pipe 2 can be connected to a flue gas analyzer after flue gas pretreatment.

[0057] As a pr...

Embodiment 2

[0059] Such as Figure 7-9 As shown, the method for using the boiler wall-attached wind device based on the soft measurement of the atmosphere near the wall of the burner comprises the following steps:

[0060] S1. First, connect the near-wall atmosphere sampling tube 2 to the flue gas analyzer, and conduct a short-term (5-15 days) off-line measurement of the near-wall atmosphere at each measuring point under the condition of adjusting different boiler operating parameters and wall-attached wind parameters. The obtained data is used to train the least squares support vector machine prediction model to obtain relevant parameters in the model, such as Figure 7 shown.

[0061] As a preferred embodiment, boiler operating parameters include: boiler load; main steam pressure and flow rate; coal quality parameters; input combination of coal mill; blade angle and damper opening of each layer of burner; furnace outlet temperature and oxygen content; Tail NOx emission value; furnace ...

Embodiment 3

[0083] Using ANSYS Fluent to conduct flow and thermal combustion numerical simulation experiments on the boiler wall-attached air device based on the soft measurement of the atmosphere near the burner wall, and analyze the effect of the wall-attached air:

[0084] 1) Calculate boundary conditions

[0085] Taking a 660MW supercritical boiler as the simulation object, the boiler adopts a medium-speed coal mill positive pressure cold primary air direct-blown pulverizing system, and the front and rear walls oppose the combustion method. There are 6 coal mills in total, and the fuel is bituminous coal. The boiler load is 100%.

[0086] 2) Calculation model

[0087] The turbulence model is Realizable k-ε, the radiation model adopts the DO model, and the combustion reaction adopts the prePDF method.

[0088] 3) Calculation result

[0089] Through numerical simulation, it is found that Figure 10 As shown, when the wall-adhering wind is closed, the near-wall O 2 The concentration i...

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Abstract

The invention relates to a boiler close-to-wall air device based on burner near-wall atmosphere soft measurement. The boiler close-to-wall air device comprises close-to-wall air nozzles, near-wall atmosphere sampling pipes, a burner and a hearth, 2-5 layers of close-to-wall air nozzles are arranged on the front wall and the rear wall near the burner and at the bottom of the hearth, and the near-wall atmosphere sampling pipes are arranged on the side wall of the hearth; the near-wall atmosphere sampling pipes are installed on the left side wall and the right side wall of the hearth, and the height of the near-wall atmosphere sampling pipes is located on the upper middle portion of a burner area; the near-wall atmosphere sampling pipes are made of heat-resistant stainless steel and are mounted on water cooling wall fins; the pipe diameter of the near-wall atmosphere sampling pipes is 10-20 mm, and 2-4 layers of near-wall atmosphere sampling pipes are arranged in total; and the near-wall atmosphere sampling pipes are connected with a flue gas analyzer. The boiler close-to-wall air device has the beneficial effects that the whole system is simple and reasonable in structure, only the the close-to-wall air nozzles and a small number of wall surface sampling test pipes need to be additionally arranged, transformation implementation is facilitated, and the technical benefit and the economic benefit are remarkable.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a boiler wall-attached wind device and method based on the soft measurement of the atmosphere near the wall surface of the burner. Background technique [0002] my country's thermal power generation usually uses coal as the main fuel, but because the sulfur content in power coal is generally too high, high-temperature corrosion often occurs on the heating surface of the boiler in the thermal power plant. With the continuous development of high-parameter, large-capacity, and environmentally-friendly boilers in power plants, the problem of high-temperature corrosion of boiler heating surface tubes has become more prominent, which is an important reason for unplanned outages of thermal power units and has become a key issue affecting the safe operation of thermal power plants. much attention. According to relevant statistics, since the discovery of high-temperature corros...

Claims

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Application Information

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IPC IPC(8): F23C7/00F23M5/08F22B35/00
CPCF22B35/00F23C7/00F23M5/085
Inventor 林闽城陈勤根赵志慧项群扬牛志刚王准李文成陈王若尘
Owner 宁夏枣泉发电有限责任公司
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