Method and system for carrying out incineration on high N-S-based saliferous organic waste liquor and carrying out purification treatment on tail gas

Abstract

The invention relates to a method and a system for carrying out incineration on high N-S-based saliferous organic waste liquor and carrying out purification treatment on tail gas. The system comprises a waste liquor incineration system, a flue gas desulfurization / denitration system, a flue gas dedusting system, a waste heat recovery system and a flue gas washing system which are sequentially connected. High N-S-based organic waste liquor is oxidized in the state of high temperature; after being oxidized completely, the high N-S-based organic waste liquor is fed into a desulfurization / denitration reactor so as to carry out thorough purification on flue gas; then, the purified flue gas is subjected to waste heat recovery. In the invention, an operation of waste liquor incineration and an operation of flue gas purification are performed in a segmented mode, therefore, not only is an incineration temperature required by thoroughly decomposing organic constituents in waste liquor satisfied, but also a favorable condition is created for subsequent desulfurization / denitration reactions. By using the method and system provided by the invention, when waste liquor and waste gas are processed, a great deal of flue gas waste heat is recovered, and a byproduct saturated steam is handled, thereby effectively reducing the operating cost of the incinerator.

Description

technical field [0001] The invention belongs to the technical field of environmental protection technology for chemical industry salt-containing organic waste liquid treatment, and in particular relates to a high N-S base salt-containing organic waste liquid incineration and tail gas purification treatment method and system thereof. Background technique [0002] The so-called high N-S organic waste liquid is rich in NO 3 - , NH 4 + , SO 4 2- 、CN - Plasma organic solution, the waste liquid is characterized by high concentration ((NH 4 ) 2 SO 4 concentration as high as 15%), high toxicity, high calorific value and usually containing sodium salt. Conventional treatment methods, including biochemical method, deep oxidation method and fluidized incineration method, cannot be industrialized due to some disadvantages. Therefore, the discharge of such waste water has caused great pressure on the environmental protection of fine chemical industries such as pesticides, dyes,...

AI Technical Summary

Problems solved by technology

Conventional treatment methods, including biochemical methods, deep oxidation methods, and fluidized incineration methods, cannot be industrialized due to some disadvantages.

Therefore, the discharge of such waste water has caused great pressure on the environmental protection of fine chemical industries such as pesticides, dyes, and pharmaceuticals, and even threatened the survival of some fine chemical companies.

[0003] The effect of biochemical treatment is not ideal when it is applied to chemical wastewater such as printing and dyeing, pesticide and pesticide intermediates and other high-salt wastewater

Because the salt concentration in the wastewater is too high, it will inhibit the growth of microorganisms. When the NaCl in the wastewater exceeds 4000mg / L, the NaCl 2 SO 4 The content exceeds 2500mg / L, which has a strong inhibitory effect on activated sludge. In addition, the toxic components in wastewater (CN - ) has a killing effect on microorganisms, which directly affects the effect of biological treatment, making it impossible to implement biochemical treatment of wastewater

[0004] Deep oxidation is not economical to treat highly concentrated organic wastewater because the consumption of oxidant increases with the concentration of pollutants

Also, the intermediate products and oxidation products produced during the actual oxidation process may be more harmful to the environment

[0005] Fluidized incineration is used to treat high N-S based organic waste liquid. Due to the presence of alkali metal salts in the waste water, eutectics with low melting points (melting point between 635 and 815°C) are bound to be formed in the bed. Accumulation of crystal salts will eventually lead to bed material agglomeration and fluidization failure

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