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Brown coal drying method and device utilizing waste heat of smoke and steam of power plant

A steam waste heat and drying equipment technology, applied in lighting and heating equipment, heating to dry solid materials, drying solid materials, etc., can solve the problems of poor quality, uneven drying of materials, etc., to improve service life, improve power supply efficiency, The effect of uniform moisture content

Active Publication Date: 2017-02-08
邹平双飞成套设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned drying methods or equipment have different problems in practical applications, such as local retention areas of materials to varying degrees. For flammable and explosive materials such as lignite and oil shale, if the local residence time in the drying equipment is too long, there will be combustion. Safety hazards such as explosion and explosion, and lead to uneven drying and poor quality of materials

Method used

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  • Brown coal drying method and device utilizing waste heat of smoke and steam of power plant
  • Brown coal drying method and device utilizing waste heat of smoke and steam of power plant

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Embodiment 1

[0044] The invention provides a lignite drying method utilizing power plant flue gas and steam waste heat. The drying method includes two drying treatments (see figure 1 ):

[0045] (1) First, use the high-temperature flue gas directly discharged from the coal-fired boiler 1.1 of the power plant to perform a drying treatment on the wet material; the high-temperature flue gas directly contacts the wet material evenly to obtain the intermediate material;

[0046] (2) Then use the high-temperature flue gas and steam directly discharged from the coal-fired boiler 1.1 of the power plant to perform secondary drying treatment on the intermediate material at the same time; the high-temperature flue gas directly contacts the intermediate material evenly, and at the same time the intermediate material exchanges heat with the steam The tubes are evenly contacted for heat exchange to obtain dry materials and realize secondary drying treatment.

[0047] Among them, the primary drying proc...

Embodiment 2

[0058] see figure 2 , the present invention is a lignite drying equipment utilizing power plant flue gas and steam waste heat, comprising a frame and a box body sealed around the frame, wherein the box body includes an upper box cover 12, an upper box body 18 and a lower box body 2. There is an intermediate partition 6 between the upper box 18 and the lower box 2; an upper hot air distribution plate 9 is installed obliquely on the frame inside the upper box 18, between the middle partition 6 and the upper hot air distribution plate 9 An air inlet 8 is arranged on the side wall of the upper box body 18, an air outlet 13 is arranged on the side wall of the upper box cover 12; An air inlet 3 is provided on the side wall of the lower box 2 below the distribution plate 5, and an air outlet 7 is provided between the lower hot air distribution plate 5 and the middle partition 6; both the air inlet 8 and the air inlet 3 are connected to the high-temperature flue gas pipeline ;

[0...

Embodiment 3

[0075] see figure 1 , the embodiment of the present invention provides an integrated system for lignite drying and power generation, including a coal-fired boiler 1.1 and lignite drying equipment (i.e. the moving fluidized bed device 1.14 in Example 1, i.e. the lignite drying equipment in Example 2 ), the high-temperature flue gas discharge pipe of the coal-fired boiler 1.1 is divided into two paths through the pipe and connected with the moving fluidized bed device 1.14, above the first-stage drying and ventilating plate 1.13, between the middle partition 1.15 and the secondary drying and ventilating plate 1.12. The tuyere and the air outlet are connected to the dust collector and the induced draft fan in turn; the steam discharge pipe of the steam turbine 1.2 of the coal-fired boiler 1.1 is connected with the screw shaft of the lignite drying equipment; Feed port connection. Wherein, the lignite drying equipment in this embodiment adopts the lignite drying equipment in Exam...

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Abstract

The invention discloses a brown coal drying method and device utilizing waste heat of smoke and steam of a power plant. The drying method comprises two-time drying treatment, wherein the two-time drying treatment comprises the steps that firstly, the high-temperature smoke directly discharged by a power plant coal fired boiler is utilized for conducting first-time drying treatment on damp materials, the high-temperature smoke directly makes uniform contact with the damp materials, and intermediate materials are obtained; and secondly, the high-temperature smoke and the high-temperature steam directly discharged by the power plant coal fired boiler are utilized for conducting second-time drying treatment on the intermediate materials at the same time, the high-temperature smoke directly makes uniform contact with the intermediate materials, meanwhile, the intermediate materials make uniform contact with a heat exchange pipe inflated with the steam for heat exchange, dried materials are obtained, and second-time drying treatment is achieved. The brown coal drying method and device have the beneficial effects that the power plant waste heat serves as a heat source for brown coal drying, the running economical efficiency of a power plant generator set is improved, a system for drying the brown coal and a brown coal power generation system are integrated, efficient utilization of power plant energy and optimization of a technology system are achieved, and the brown coal drying method and device belong to the poly-generation technology of the power plant.

Description

technical field [0001] The invention relates to the technical field of lignite drying for clean coal power generation, in particular to a lignite drying method and drying equipment utilizing power plant flue gas and steam waste heat. Background technique [0002] Lignite is rich in reserves and low in price, and has been valued by more and more coal-fired power stations in the face of increasingly prominent energy issues. However, lignite contains 20-50% moisture, and high-moisture lignite directly participates in combustion, resulting in serious heat loss from combustion exhaust, low efficiency of generating units, poor operating economy, and high construction costs. The flue gas and steam generated during lignite combustion for power generation are often discharged as low-quality heat sources, resulting in energy waste. There are many drying techniques for lignite, which can be divided into direct heating drying and indirect heating drying according to the way in which th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B1/00F26B3/04F26B3/08F26B17/04F26B17/20F26B21/14F26B23/10F26B25/00
CPCF26B1/00F26B3/04F26B3/08F26B17/045F26B17/20F26B21/14F26B23/10F26B25/002Y02P70/10
Inventor 于才渊张乐川祁金胜蒋莉安春国郑高飞张坤媛
Owner 邹平双飞成套设备有限公司
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