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Method and system for cooling hot gases by water injection

A technology for cooling gas and hot gas, applied in gas treatment, separation methods, greenhouse gas reduction, etc., to achieve the effect of simplifying equipment

Inactive Publication Date: 2011-08-03
DALL ENERGY HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0040] However, the vertical towers of these cooling systems will have a typical length / diameter ratio in excess of 5, and these cooling systems will typically have a height of 20-30m, which is considered to be a problem for smaller plants - such as district heating gasification plants - — is inappropriate, where building legislation very often limits the height to generally below 10m

Method used

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  • Method and system for cooling hot gases by water injection
  • Method and system for cooling hot gases by water injection
  • Method and system for cooling hot gases by water injection

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Embodiment Construction

[0065] exist figure 1 In , 1 represents a thermal reactor, which is supplied with fuel, air or oxygen, and water and / or steam. Item 2 is the channel for conveying hot gas from the thermal reactor to the evaporative cooler 4 .

[0066] The evaporative cooler is oriented vertically. Item 3 is one or more water inlet nozzles. Nozzles can use air / gas assisted atomization.

[0067] Some particles (dust and condensed alkali salts) can be separated in the evaporative cooler and can be removed from the bottom, and the evaporative cooler discharge channel 5 directs the dry, relatively clean cooling air to the residual particle filter - its It can be a scrubber, bag house filter, cyclone or electrostatic precipitator, among others. Fan 7 handles the pressure drop across the system.

[0068] A sensor S placed downstream of the evaporative cooler 4 measures the temperature and / or humidity of the gas leaving the evaporative cooler 4 . The measurement of temperature and / or humidity i...

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Abstract

Hot gas, produced in a thermal reactor (1), can be cooled in a cylindrical cooling reactor (4) by leading the gas tangentially into the evaporative cooler through and inlet duct (2) whereby the gas perform a rotary movement in the evaporative cooler, and by injection water droplets into the gas at one or more injection zones (3) in such an amount and in such a way that the gas temperature due to water evaporation is reduced to below 400 DEG C. The dry cooled gas can now leave the reactor through the outlet duct (5) and be cleaned for particles in a dry filter (7) and energy can be recovered in a condensing unit (8). Hereby, a compact cooling, cleaning and energy recovery system is obtained, which is cheap and simple and has low maintenance costs, and which moreover has a high efficiency degree and good environmental qualities. The method can be used for a broad spectrum of fuels and conversion technologies.

Description

[0001] In particular, the present invention relates to methods and systems for cooling and purifying hot gases (e.g. exhaust gases) produced in thermal reactors, or more precisely to the use of water injection to cool the gas produced by the fuel by evaporating some or all of the injected water. Processes and systems for gases released from the thermal conversion (gasification or combustion) of - eg biomass, waste, coal, oil, gas or mixtures of these. [0002] Furthermore, the present invention can be used to cool and purify hot gases released from industrial plants such as cement kilns, refineries, metal processing plants, and the like. Background of the invention [0003] For environmental purposes, the hot gas is cooled and cleaned, since particulates and other pollutants such as sulfur, chlorides, etc. are thereby removed before the gas is released into the atmosphere. Hot gases are also cooled and purified in power plants, where the energy of the gas is transferred to a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/04F23J15/06B01D47/06B01D53/78
CPCF23J15/06B01D53/10F23J15/04B01D47/06B01D2257/2064Y02E20/363B01D2253/102B01D2257/2025B01D2257/30B01D2251/404F23J2219/40B01D2259/40F23J2219/80Y02E20/346Y02E20/30Y02P70/10
Inventor J·D·本特森
Owner DALL ENERGY HLDG