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Coal-fired boiler hot primary wind heating system

A technology of coal-fired boiler and heating system is applied in the field of air supply device of pulverized coal boiler to achieve the effects of improving the operating economy of the unit and reducing the temperature of the exhaust gas of the boiler

Inactive Publication Date: 2010-05-19
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To achieve this without affecting the heat transfer effect of the air preheater and ensuring a reasonable air powder temperature at the outlet of the coal mill, it is impossible to solve this problem with the existing systems and equipment

Method used

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  • Coal-fired boiler hot primary wind heating system
  • Coal-fired boiler hot primary wind heating system
  • Coal-fired boiler hot primary wind heating system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: see figure 1 , this embodiment includes blower 1 and air preheater 6, between blower 1 and air preheater 6 is provided with air preheater secondary air inlet duct 2, air preheater primary air inlet duct 4 and air The secondary air inlet duct 2 of the preheater is connected, and a hot primary fan 3 is installed at the entrance of the primary air inlet duct 4 of the air preheater, and a hot secondary air duct 7 is respectively installed at the outlet of the air preheater 6 And hot primary air duct 8.

[0019] In this embodiment, a hot primary air heater 9 is newly added in the original hot primary air pipeline 8. The hot primary air heater 9 is a general-purpose air-water heat exchanger, and a cooling medium is provided on the hot primary air heater 9. The inlet pipeline (10) and the cooling medium outlet pipeline (12), the cooling medium inlet pipeline 10 is equipped with a regulating valve 11 for adjusting the cooling medium flow. In order to adjust the ...

Embodiment 2

[0020] Example 2: see figure 2 In this embodiment, an air heater 5 is also provided on the secondary air inlet duct 2 of the air preheater and the primary air inlet duct 4 of the air preheater. Other connections are the same as in Embodiment 1.

Embodiment 3

[0021] Embodiment 3: see image 3 In this embodiment, a hot air recirculation pipe 13 connected to the blower 1 is also provided on the hot secondary air pipe 7, and a hot air recirculation pipe shut-off valve 14 and a hot air recirculation pipe adjustment valve 13 are also provided on the hot air recirculation pipe 13. Damper 15. Other connections are the same as in Embodiment 1.

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Abstract

The invention relates to a coal-fired boiler hot primary wind heating system. The hot primary wind pipeline in the original air supply system of a boiler is provided with a hot primary wind heater, the hot primary wind heater is communicated with a cooling medium inlet pipeline and a cooling medium outlet pipeline, the heat source for heating is the hot primary wind, and the cooling medium flow of the hot primary wind heater can be changed to control the temperature of the hot primary wind on the back of the heater so that the temperature of the hot primary wind is reduced to the temperature required by a coal pulverizing system, the quantity of the cool primary wind introduced in the coal pulverizing system is reduced to less than 5%, even 0, thus the cool primary wind which was introduced in the coal pulverizing system in the past is now introduced to an air preheater and converted to the hot primary wind so as to increase the heat exchange effect of the air preheater and reach the aim of reducing the smoke temperature of the boiler.

Description

technical field [0001] The invention relates to an air supply device for a pulverized coal boiler, in particular to a hot primary air heating system for a coal-fired boiler. Background technique [0002] When setting up the pulverizing system of the coal-fired boiler of the thermal power unit, in order to ensure the drying output of the pulverizing system, a certain insurance factor is usually reserved for the primary air volume and temperature; system safety and explosion-proof requirements), the pulverizing system is designed with a cold primary air bypass device. When the temperature of the air powder at the outlet of the coal mill is too high, the damper of the primary air-cooled air bypass is opened to increase the flow of the cold primary air to reduce the temperature of the inlet air of the coal mill, so as to control the air powder at the outlet of the coal mill temperature purpose. [0003] With the increase of the capacity of the unit, the temperature of the prim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00F23L1/00F23L9/00
CPCY02E20/34
Inventor 王春昌
Owner XIAN THERMAL POWER RES INST CO LTD
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