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Absorbent capable of simultaneously performing desulfurization, denitrification and VOCs (Volatile Organic Compounds) removal on flue gas as well as preparation and application of absorbent

A desulfurization, denitrification, and absorbent technology, which is applied in the direction of air quality improvement, the use of liquid separation agents, chemical instruments and methods, etc., can solve the problems of being unsuitable for removing biomass flue gas, high investment and operation costs, and difficult operation and management. Achieve the effect of small footprint, simple preparation and use, and simple overall process

Active Publication Date: 2014-04-16
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For denitrification, although domestic power plants are promoting the application of SCR and SNCR denitrification technologies, due to factors such as technical adaptability, investment and operation costs, and pollutant removal efficiency, the above denitrification technologies are more difficult to apply in the denitrification of biomass boiler combustion flue gas; As far as VOCs are concerned, activated carbon adsorption, catalytic oxidation and other technologies commonly used in industry also have problems such as high investment and operation costs, complex processes, and difficult operation and management, and are not suitable for removing VOCs from biomass flue gas.

Method used

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  • Absorbent capable of simultaneously performing desulfurization, denitrification and VOCs (Volatile Organic Compounds) removal on flue gas as well as preparation and application of absorbent
  • Absorbent capable of simultaneously performing desulfurization, denitrification and VOCs (Volatile Organic Compounds) removal on flue gas as well as preparation and application of absorbent
  • Absorbent capable of simultaneously performing desulfurization, denitrification and VOCs (Volatile Organic Compounds) removal on flue gas as well as preparation and application of absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The total flue gas volume of a 35t / h biomass boiler is 60,000 m 3 / h, measured SO in the flue gas before purification 2 The concentration is 600~750mg / m 3 , with an average concentration of 675mg / m 3 ;NO X The concentration is 350~550mg / m 3 , with an average concentration of 450mg / m 3 ; TVOCs concentration is 150-200mg / m 3 , with an average concentration of 175mg / m 3 .

[0042] The absorption tower adopts the high-efficiency absorption tower (ZL200420103291.9) prepared by the existing patented technology: the tower height is 15m, the tower diameter is 3m, and the gas residence time is >4s.

[0043] The process flow of purifying flue gas pollutants is as follows: figure 1 As shown: the flue gas enters the high-efficiency absorption tower from the high-speed swirl at the bottom of the high-efficiency absorption tower; the prepared flue gas simultaneously desulfurizes, denitrates and deVOCs absorbent is added to the circulating sedimentation tank by the dosing pump...

Embodiment 2～7

[0047] The amount of flue gas purified in Examples 2 to 7, the components and concentrations in the flue gas before purification, the absorption tower, and the flue gas purification process are all the same as in Example 1. The preparation method and purification effect of the flue gas simultaneous desulfurization, denitrification and deVOCs absorbent used in the flue gas purification process in each embodiment are shown in Table 1.

[0048] Absorbent preparation, composition and pollutant purification effect in table 1 embodiment 1~7

[0049]

[0050]

[0051] It can be seen from Table 1 that the absorbents prepared in Examples 1 to 7 have a great impact on pollutant SO 2 , NOx, TVOCs all have very good removal effect.

Embodiment 8

[0053] An industrial boiler was mixed with sludge, and the SO in the flue gas before purification was measured 2 The concentration is 800~1100mg / m 3 , with an average concentration of 950mg / m 3 ;NO X The concentration is 500~600mg / m 3 , with an average concentration of 550mg / m 3 ;The concentration of TVOCs is 150-350mg / m 3 , with an average concentration of 250mg / m 3 .

[0054] The absorption tower adopts the high-efficiency absorption tower (ZL200420103291.9) prepared by the existing patented technology: the tower height is 15m, the tower diameter is 3m, and the gas residence time is >4s. Process flow is identical with embodiment 1. The preparation, composition and purification effect of the absorbent are shown in Table 2.

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Abstract

The invention discloses an absorbent capable of simultaneously performing desulfurization, denitrification and VOCs (Volatile Organic Compounds) removal on flue gas as well as a preparation and an application of the absorbent. The absorbent is prepared from the following components by mass percentage: 5% to 10% of ammonium salt, 0.01% to 0.50% of a surfactant, 0.1% to 2% of a complexing agent and the balance being water. The absorbent can be used for efficiently and simultaneously purifying multiple contaminants such as dust, SO2, NOX and the VOCs in the flue gas by using one set of equipment. The absorbent has the advantages that contaminant removal efficiency is high, process equipment is simple, small in occupation area and low in investment and running cost, system is easy to control and manage, and the like. The raw materials of the absorbent are easily available and low in cost. The absorbent is simple and safe to transport, store, prepare and use and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a flue gas simultaneous desulfurization, denitrification and deVOCs absorbent and its preparation and application. Background technique [0002] As people pay more and more attention to the environment, energy utilization, etc., and fossil fuels such as coal and oil are decreasing day by day, biomass energy, as a new renewable resource, has increasingly become the object of development and utilization by various countries. Biomass energy has the characteristics of extensive resource sources, diversified utilization methods, diversified energy products, and significant comprehensive benefits. The development of biomass energy is conducive to adjusting the energy structure, alleviating the contradiction between energy supply and demand, reducing greenhouse gas emissions, and promoting the successful completion of national energy conservation and emission r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60B01D47/06
CPCY02A50/20
Inventor 岑超平方平唐子君陈雄波唐志雄
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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