Device for preventing downwash of smoke plume for chimney

A chimney and smoke prevention technology, applied in the field of chimneys, can solve problems such as chimney freezing, achieve the effects of avoiding contact, reducing energy consumption and operation and maintenance costs, and raising the height of smoke plumes

Active Publication Date: 2017-05-31
SHANGHAI DEFOG ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device for preventing smoke plume downwashing of chimneys, which can solve the problem of chimney freezing caused by smoke plume downwashing

Method used

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  • Device for preventing downwash of smoke plume for chimney
  • Device for preventing downwash of smoke plume for chimney
  • Device for preventing downwash of smoke plume for chimney

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The type of chimney in this embodiment is a brick inner tube chimney, the outer tube of the chimney is made of reinforced concrete, and the inner tube of the chimney is made of acid-resistant bricks. The inner tube of the chimney is 210m high, the outlet diameter is 7.5m, and the flue gas treatment capacity under 100% load of the unit is 3624074m 3 / h, the minimum operating load of the unit is 45%, the wind speed at the outlet of the chimney inner tube is 8.7m / s, and the smoke density is 1.025kg / m 3 , the air density is 1.17kg / m 3 .

[0037] First of all, according to the above parameters, a three-dimensional mathematical model of the wet chimney is established, and through CFD fluid simulation, it is predicted that the unit load of the chimney is below 75%, and there will be smoke plume downwashing.

[0038] Next, the trajectory and influence range of plume downwashing at the minimum operating load are determined through CFD fluid dynamics simulation; further, the st...

Embodiment 2

[0051] Figure 5 It is a schematic installation diagram of a device for preventing smoke plume downwashing of a chimney in this embodiment; its A-A cross-sectional view is the same as figure 2 .

[0052] The difference between this embodiment and Embodiment 1 is that this device is applied to a single-tube concrete chimney, and the chimney includes a masonry inner lining 18, a heat insulation layer 16, an outer cylinder 10 of the chimney and a concrete topping 9 of the chimney.

Embodiment 3

[0054] Figure 6 It is an installation schematic diagram of a device for preventing smoke plume downwashing of a chimney according to this embodiment; Figure 7 yes Figure 6 A-A sectional view of .

[0055] The difference between this embodiment and the previous two embodiments is:

[0056] (1) The device is applied to a steel inner tube chimney, which includes a chimney inner tube 8, a chimney outer tube 10, ultra-fine glass wool 17 and a rain cover 19. The chimney outer cylinder 10 is made of reinforced concrete, and the chimney inner cylinder 8 is a steel inner cylinder.

[0057] (2) The materials of the necking 1 and the windshield 2 of this embodiment are different from those of the first two embodiments. In this embodiment, the necking 1 and the windshield 2 are made of steel inner cylinder; The space is connected by welding, the necking 1 and the steel inner cylinder are fixed by welding, and the windshield 2 and the necking 1 are fixed by welding.

[0058] (3) In...

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PUM

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Abstract

The invention discloses a device for preventing downwash of smoke plume for a chimney. The device is characterized in that through CDF fluid dynamics analogue simulation design, a shrink mouth is formed in the top of the chimney, and air baffles are arranged on the outer wall of the shrink mouth, so that smoke is exhausted from the shrink mouth, and the flow speed at a smoke outlet is increased; and besides, through the arranged air baffles, local vertical air speed on the outer wall of the shrink mouth can be increased; through the combination of the shrink mouth and the air baffles, the height of the smoke plume is increased, so that the phenomenon that smoke plume washes down can be avoided. Through the adoption of the device, the contact of smoke plume and a chimney body can be avoided, so that the hidden danger that the chimney is frozen can be fundamentally eliminated. Compared with a conventional electric heating device, the device can thoroughly solve the problem that the chimney is frozen due to the downwash of smoke plume; besides, the device disclosed by the invention is simple in structure, and modular design and mounting are adopted; and the device is low in cost, safe and reliable, and basically no maintenance cost is needed for later periods. The device disclosed by the invention is applicable to various chimneys of thermal power plants, such as concrete single-tube chimneys, brick sleeve chimneys, steel sleeve chimneys and glass fiber reinforced plastic chimneys.

Description

technical field [0001] The invention relates to the technical field of chimneys, in particular to a device for preventing smoke plume downwashing of chimneys. Background technique [0002] More than 90% of thermal power units above 300MW in my country use limestone-gypsum wet flue gas desulfurization (WFGD) technology. Early WFGD systems were equipped with flue gas heat exchangers (GGH), so that the temperature of the flue gas after desulfurization can reach about 80°C or higher. . However, in actual operation, GGH components will suffer from serious corrosion, component blockage and other problems, which will affect the safe and stable operation of the desulfurization system. Therefore, most power plant desulfurization systems will not use GGH in the later period, and the original GGH will gradually be dismantled. In the wet desulfurization system without GGH, the flue gas temperature is about 50°C, and the water in it is close to saturation, forming a "wet chimney" emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J13/00
CPCF23J13/00Y02A50/2351
Inventor 戴永阳吴永杰傅懋曹凌燕江传伟
Owner SHANGHAI DEFOG ENVIRONMENTAL SCI & TECH
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