Wet desulfurization smoke dehumidifying and white smoke eliminating system and method

A wet desulfurization and flue gas technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as excessive discharge, blockage, and smoke, and achieve high operational flexibility, reduce haze pollution, and reduce smog pollution. cost effect

Pending Publication Date: 2019-03-01
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used flue gas dewhitening measures include conventional dewhitening processes such as GGH and MGGH. However, general heat exchangers are used in the implementation. The minimum metal wall temperature is usually about 70°C lower than the flue gas exhaust temperature, which is prone to blockage and corrosion. , string smoke and other phenomena that lead to excessive emissions

Method used

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  • Wet desulfurization smoke dehumidifying and white smoke eliminating system and method
  • Wet desulfurization smoke dehumidifying and white smoke eliminating system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 , a wet desulfurization flue gas dehumidification and whitening system, comprising a desulfurization tower 2, the flue gas inlet of the desulfurization tower 2 is provided with a cooling phase-change heat exchanger, the flue gas outlet of the desulfurization tower 2 is connected with the flue gas of the chimney A flue gas condenser 6 and a flue gas heating heat exchanger 7 are arranged between the inlets, the flue gas inlet of the flue gas condenser is connected with the flue gas outlet of the desulfurization tower, and the flue gas outlet of the flue gas condenser is connected with the flue gas heating The flue gas inlet of the heat exchanger is connected, and the flue gas outlet of the flue gas heating heat exchanger is connected with the flue gas inlet of the chimney 8; The inlet is connected, the first outlet of the steam drum is connected with the circulating medium inlet of the cooling phase-change heat exchanger through the downcomer; the second outl...

Embodiment 2

[0034]see figure 2 , the present invention provides a wet desulfurization flue gas dehumidification and whitening system that also includes a plate heat exchanger 10 and a process water tank 9, the second outlet of the steam drum is connected to the circulating medium inlet of the plate heat exchanger 10, and the plate heat exchanger The circulating medium outlet of the heat exchanger 10 is connected with the second inlet of the steam drum; the water outlet of the process water tank 9 is connected with the water inlet of the plate heat exchanger 10 through the process water delivery pump 403, and the water outlet of the plate heat exchanger 10 Connect with the factory pipe network.

[0035] Further, the circulating medium outlet of the plate heat exchanger 10 is connected to the second inlet of the steam drum through the heat medium circulation pump 402 or the second outlet of the steam drum is connected to the plate heat exchanger through the heat medium circulation pump 402...

Embodiment 3

[0039] The present invention provides a method for dehumidification and whitening of wet desulfurization flue gas, comprising the following steps:

[0040] Use the cooling phase-change heat exchanger installed at the flue gas inlet of the spray desulfurization tower to reduce the temperature of the original flue gas to above the acid dew point temperature of 10-15°C, and then the cooled flue gas enters the spray desulfurization tower for desulfurization, the maximum The waste heat of the original flue gas is recovered to the greatest extent; the saturated wet flue gas after desulfurization enters the flue gas condenser, and the cooling tower is controlled to provide the cold source to the flue gas condenser, so that the cold source provided by the cooling tower and the saturated wet flue gas at the outlet of the spray desulfurization tower Heat exchange is carried out in the flue gas condenser, and the flue gas temperature is further reduced through the flue gas condenser. The ...

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Abstract

The invention relates to a wet desulfurization smoke dehumidifying and white smoke eliminating system and method. The system comprises a desulfurization tower, a smoke inlet of the desulfurization tower is provided with a cooling-phase conversion heater, a smoke condenser and a smoke heating heat exchanger are arranged between an outlet of the desulfurization tower and a chimney, a smoke inlet ofthe smoke condenser is connected with a smoke outlet of the desulfurization tower, a smoke outlet of the smoke condenser is connected with a smoke inlet of the smoke heating heat exchanger, and a smoke outlet of the smoke heating heat exchanger is connected with a smoke inlet of the chimney. The cooling-phase conversion heater is connected with a steam pocket through an ascending pipe and a descending pipe. An outlet of the steam pocket is connected with a circulating medium inlet of the smoke heating heat exchanger, and a circulating medium outlet of the smoke heating heat exchanger is connected with an inlet of the steam pocket. A circulating medium outlet of the smoke condenser is connected with an inlet of a cooling tower, and an outlet of the cooling tower is connected with a circulating medium inlet of the smoke condenser. Risks of dew corrosion and ash blockage are avoided, haze pollution can be greatly reduced, and low cost in environmental-friendly standardized discharge is realized.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to a wet desulfurization flue gas dehumidification and whitening system and method. Background technique [0002] Wet desulfurization is a desulfurization process commonly used in my country, and its exhaust gas has a temperature of 50°C-60°C and a humidity of 100-200g / Nm 3 saturated wet flue gas, while the average humidity of the atmosphere in my country is only 9g / Nm 3 , The wet desulfurization flue gas humidity is more than 10 times the average atmospheric humidity. Due to the low ambient temperature, the water vapor in the wet flue gas condenses to form mist droplets, forming a "white smoke" phenomenon at the chimney outlet. Since 2017, Zhejiang, Shanghai, Tianjin and other places have successively issued air emission requirements, aiming at steel plant sintering machines, coal-fired boilers, coking and other industries, after implementing wet desulfurization, smo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00
CPCB01D53/002
Inventor 罗海兵潘响明胡鑫向浩夏小群张兵徐超周冲夏长宝李凌
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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