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Ultralow-consumption crystallization and recovery method of magnesium sulfate from sulfur-containing waste gas through multistage combined desulfurization wastewater critical saturation method

A technology for desulfurization wastewater and magnesium sulfate, applied in the fields of magnesium sulfate, chemical instruments and methods, separation methods, etc.

Inactive Publication Date: 2021-09-17
谢冠林 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention realizes the crystallization recovery of magnesium sulfate through two-stage absorption and uses a very small amount of heat energy, which solves the current industry problems

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  • Ultralow-consumption crystallization and recovery method of magnesium sulfate from sulfur-containing waste gas through multistage combined desulfurization wastewater critical saturation method

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Embodiment

[0063] Example: 2×65t / h boiler + 2×6MW back pressure turbogenerator desulfurization system transformation

[0064] 1. Basic situation of existing boilers

[0065] The existing two boilers share a 120 high exhaust pipe. The two boilers operate simultaneously during the heating period; only one operates during the non-heating period. The annual coal consumption is 95,000 tons. The annual operating hours of the boiler are 8760h, 3360h during the heating period and 5400h during the non-heating period. The annual power generation of the project is 62 million kWh, the annual power supply is 38.26 million kWh, and the annual heat supply is 2.2 million GJ. The sulfur dioxide desulfurization efficiency is not less than 99%, which can meet the 35mg / m3 in the "Emission Standard of Air Pollutants for Thermal Power Plants" (DB37 / 664-2019) 3 standard. The actual online monitoring data range before transformation is 5.5-22mg / m 3 ; The measured emission rate is 0.12~0.47kg / h. The measu...

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Abstract

The invention discloses an ultralow-consumption crystallization and recovery method of magnesium sulfate from sulfur-containing waste gas through a multistage combined desulfurization wastewater critical saturation method, and a method for realizing magnesium sulfate crystallization and recycling and waste water zero discharge. According to the invention, the magnesium sulfate in the desulfurization absorption liquid can be naturally evaporated to approach the critical saturation concentration under the condition that no other heat sources are supplied basically by virtue of the waste heat of the sulfur-containing waste gas; and then crystallization and recycling of the magnesium sulfate can be realized by adopting low-cost modes such as an air cooling tower and centrifugal dewatering separation, so that zero emission of desulfurization wastewater can be realized by using extremely little heat energy on the premise of ensuring standard emission of desulfurization. The first stage of the method is sulfur dioxide pre-absorption to make the magnesium sulfate concentration close to saturation, so that heat energy consumption in the subsequent magnesium sulfate crystallization process can be reduced; and by arranging a two-stage or multi-stage cross flow mode, the contradiction between a good low-magnesium sulfate concentration desulfurization effect and high evaporative crystallization cost in one-stage wet magnesium oxide desulfurization which is widely adopted at present is solved.

Description

technical field [0001] The invention relates to the technical field of multi-stage combined desulfurization, in particular to a method for recovering magnesium sulfate through ultra-low consumption crystallization by critical saturation of sulfur-containing waste gas multi-stage combined desulfurization wastewater. Background technique [0002] Natural coal contains a certain amount of sulfur, and the sulfur dioxide produced after burning is the main component of acid rain. Therefore, desulfurization is a necessary measure for all coal-fired boilers in my country. There are various desulfurization methods at present, and the current wet desulfurization mainly includes calcium-based and magnesium oxide desulfurization. Under the same conditions, magnesium oxide desulfurization has the characteristics of high efficiency, less investment, low operating costs, equipment is not easy to scale and block, and the pH value is high and the corrosion of equipment is low. The reserves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/75B01D53/80B01D53/96C01F5/40
CPCB01D53/502B01D53/75B01D53/80C01F5/40B01D53/96B01D2251/402B01D2251/602Y02P20/129
Inventor 朱崇龙孟晓琦谢冠林
Owner 谢冠林
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