Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection

A technology for gas-fired boilers and flue gas waste heat, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of high equipment investment and operation costs, insoluble in water, low removal rate of nitrogen oxides, etc. Achieving significant water saving effect and cost reduction effect

Inactive Publication Date: 2013-12-04
李崇兴
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Problems solved by technology

However, since the main component of nitrogen oxides in flue gas is carbon monoxide, which is difficult to dissolve in water, the removal rate of nitrogen oxides is low.
[0005] In order to improve the removal rate of nitrogen oxides, the invention patent of "Boiler Flue Gas Ozone Oxidation and Denitrification Method" with application number 200510061120.3 discloses an oxidation absorptio

Method used

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  • Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection
  • Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection

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Embodiment 1

[0021] This embodiment is a reflux system, which is suitable for the working condition of high boiler exhaust gas temperature. Part of the flue gas cooled by the heat pump evaporator 6 needs to be refluxed to the mixing cooler 5 and mixed with the flue gas from the plate heat exchanger 4 Lower the temperature and enter the spray chamber 8 again to absorb denitrification, so that better denitrification effect can be obtained.

[0022] as attached figure 1 Shown:

[0023] The boiler flue gas is pumped by the fan 2 to the air duct 1, and ozone is added before entering the plate heat exchanger 4 to oxidize the nitrogen monoxide in the flue gas to nitrogen dioxide. When the flue gas passes through the plate heat exchanger 4, it will Condensed water is produced, which dissolves part of the nitrogen dioxide. After the flue gas passes through the plate heat exchanger, the temperature drops to about 50°C, mixes with the low-temperature flue gas from the evaporator 4 and drops to abou...

Embodiment 2

[0025] This embodiment is a once-through system, which is suitable for working conditions where the boiler exhaust temperature is low. The flue gas passing through the plate heat exchanger 4 directly enters the spray chamber 8 to absorb denitrification, and then passes through the heat pump evaporator 6 to cool down, such as the exhaust gas temperature Higher, multi-stage absorption cooling can be set, which not only reduces the exhaust gas temperature, but also improves the effect of denitrification.

[0026] as attached figure 2 Shown:

[0027] The boiler flue gas is pumped by the fan 2 to the air duct 1, and ozone is added before entering the plate heat exchanger 4 to oxidize the nitrogen monoxide in the flue gas to nitrogen dioxide. When the flue gas passes through the plate heat exchanger 4, it will Condensed water is produced, which dissolves part of the nitrogen dioxide. After the flue gas passes through the plate heat exchanger, the temperature drops below 40°C. Mul...

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Abstract

The invention provides a gas-fired boiler (a direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection, and especially a gas-fired boiler flue-gas waste heat recovery device capable of removing nitric oxides in flue gas by employing a method comprising ozonation and alkali-liquid absorption. According to the device of the invention, an ozonator, a spraying chamber, an alkali-liquid sprayer and the like are increased based on a conventional gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device. During flue gas waste heat recovery by using the gas-fired boiler (the direct-fired machine), ozone is added to the flue gas, so that nitric oxide in the flue gas is oxidized into nitrogen dioxide and other high valent nitric oxides, and the nitric oxides are absorbed by a sprayed alkali liquid, so that denitration is realized. The final flue discharged temperature is reduced to a normal temperature, and the vast majority of vapor in the flue gas is congealed into water which can be recovered in abundance for production and life, so that water-saving effect is substantial. Because of economic benefit and water-saving benefit generated by the gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device, and because of recovery of nitrate products, the investment and operating cost of the gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device are reduced. An energy saving and emission reduction technology with low investment, low operating cost and high efficiency is provided.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery device of a gas-fired boiler (direct-fired engine), especially a gas-fired boiler (direct-fired engine) capable of removing nitrogen oxides (denitration) in the flue gas and collecting condensed water (water collection) in the flue gas. ) Flue gas waste heat recovery device. Background technique [0002] The main component of natural gas is methane, which produces carbon dioxide and water during combustion. Therefore, the flue gas emitted by gas-fired boilers (direct combustion engines) contains a large amount of water vapor, accounting for about 20% of the flue gas volume. At present, the exhaust gas temperature of gas-fired boilers is higher than 120°C, and a large amount of latent heat and water are discharged into the air and are wasted. The existing relatively mature flue gas waste heat recovery technology can only reduce the flue gas to above 60°C, and most of the latent heat and water cann...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56
Inventor 李崇兴
Owner 李崇兴
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