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Two-stage combustion coupled two-stage heat exchange process and system for desulfurization waste liquid

A technology for desulfurization waste liquid and heat exchange system, applied in the field of combustion boilers, can solve the problems of restricting steam quality, interfering with the acid-making process, restricting power generation efficiency, etc., achieving high economic benefits, simple system structure, and reducing the yield of generated acid. Effect

Pending Publication Date: 2022-02-01
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] At this stage, the incineration process of crude sulfur and sulfur-containing waste liquid is often to spray the desulfurization waste liquid directly into the combustion furnace for combustion after simple concentration, in order to prevent the incineration flue gas NO x Exceeding the standard, the flue gas temperature needs to be controlled below 1100°C, which limits the quality of the steam generated by the waste heat boiler, which in turn limits the power generation efficiency
In addition, the field investigation found that the incineration flue gas contains a large amount of NH 3 , NH 3 From the thermal decomposition of ammonium salt in the waste liquid, this part of NH 3 SO in the flue gas cleaning device and in the flue gas of the acid production section 3 Combines to form ammonium sulphate, causing risk of clogging and interfering with the acid making process

Method used

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  • Two-stage combustion coupled two-stage heat exchange process and system for desulfurization waste liquid

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Experimental program
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Effect test

Embodiment 1

[0035] Coarse sulfur is atomized and sprayed into the first burner 3 in liquid form, and oxygen-enriched air with 30% oxygen content is simultaneously passed into the first burner 3, and the atomized liquid crude sulfur is combusted to produce stage I flue gas with a temperature higher than 1300°C ; The flue gas in the first stage enters the second heat exchange device 5 to cool down, where the temperature of the flue gas in the first stage drops below 1000 ° C, and then enters the second burner 10; the desulfurization waste liquid with a salt content of w.50% is atomized and sprayed into the second burner 10, and the supplementary combustion gas and supplementary air are synchronously fed into the second burner 10. By adjusting the volume of supplementary combustion gas and supplementary air, the temperature of the flue gas in the second stage is controlled at 900-1200°C, and the second burner The second-stage flue gas from 10 enters the first heat exchange device 12, where th...

Embodiment 2

[0037] Coarse sulfur is atomized and sprayed into the first burner 3 in liquid form, and oxygen-enriched air with 50% oxygen content is simultaneously passed into the first burner 3, and the atomized liquid crude sulfur is combusted to produce stage I flue gas with a temperature higher than 1500°C ; The flue gas in the first stage enters the second heat exchange device 5 to cool down, where the temperature of the flue gas in the first stage drops below 1000 ° C, and then enters the second burner 10; the desulfurization waste liquid with a salt content of w.75% is atomized and sprayed into the second burner 10, and the supplementary combustion gas and supplementary air are synchronously fed into the second burner 10. By adjusting the volume of supplementary combustion gas and supplementary air, the temperature of the flue gas in the second stage is controlled at 900-1200°C, and the second burner The second-stage flue gas from 10 enters the first heat exchange device 12, where th...

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Abstract

The invention relates to the technical field of combustion boilers, in particular to a two-stage combustion coupled two-stage heat exchange process and system for desulfurization waste liquid. The system comprises a first combustor used for combustion of crude sulfur, a second combustor used for combustion of sulfur-containing waste liquid, a first heat exchange device and a second heat exchange device, wherein stage-I flue gas generated in the first combustor enters the second combustor after passing through the second heat exchange device, stage-II flue gas generated in the second combustor is used for preparing acid after passing through the first heat exchange device; and cooling water sequentially flows through the first heat exchange device and the second heat exchange device, and high-quality steam is generated after the cooling water exchanges heat with the stage-II flue gas in the first heat exchange device and the stage-I flue gas in the second heat exchange device. After two-stage combustion is coupled with two-stage heat exchange, the steam quality is improved, then the power generation efficiency is improved, NOx in flue gas does not exceed the standard, meanwhile, the content of NH3 in the flue gas is reduced, and interference of NH3 on the subsequent acid making process is weakened.

Description

technical field [0001] The invention relates to the technical field of combustion boilers, in particular to a two-stage combustion coupled two-stage heat exchange process and system for desulfurization waste liquid. Background technique [0002] The coking industry in my country mostly adopts the ammonia wet oxidation desulfurization process using HPF, PDS, etc. as catalysts to remove H from gas. 2 S and HCN, in the desulfurization and decyanation process, desulfurization waste liquid rich in sulfur foam and ammonium salt is produced, and after the separation process, low-purity sulfur (crude sulfur) and ammonium thiocyanate and ammonium thiosulfate are obtained as the main dissolved substances sulfur-containing waste liquid. Crude sulfur contains impurities such as coal powder, tar, naphthalene, etc. The product has low purity and is difficult to sell in the market. In addition, the desulfurization waste liquid is recognized as hazardous waste by the Ministry of Environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/04F23G5/08F23G5/44F23J15/02F23J15/04F23J15/06F22B1/22F23L7/00
CPCF23G7/04F23G5/08F23G5/44F23J15/02F23J15/04F23J15/06F22B1/22F23L7/007Y02E20/30Y02E20/34
Inventor 熊劲邵雁向浩刘子豪陶惠祥张兵施飞夏阳皮鎏汪远许晓明郭华军胡国峰陈堃李姗姗姜明明刘颖史记熙
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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