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Complete set of device and method for treating tail gas from sludge incineration through semidry method

A technology of sludge incineration and semi-dry method, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. The effect of emissions

Active Publication Date: 2011-07-13
BMEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as domestic sludge incineration plants are concerned, both in theory and in practice, there are still a lot of problems to be solved, such as low treatment efficiency and difficulty in reaching standards.

Method used

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  • Complete set of device and method for treating tail gas from sludge incineration through semidry method
  • Complete set of device and method for treating tail gas from sludge incineration through semidry method
  • Complete set of device and method for treating tail gas from sludge incineration through semidry method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) The outlet of the lime slurry delivery pump 10, the atomizing spray gun 11, and the semi-dry deacidification tower 1 are sequentially connected through pipelines;

[0040] 2) The incineration tail gas delivery pipeline 12 is connected to the top entrance of the semi-dry deacidification tower 1;

[0041] 3) Semi-dry deacidification tower 1, expansion reactor 2, bag filter 3, induced draft fan 4, monitoring system 5, and chimney 6 are connected through pipelines in sequence;

[0042] 4) Roots blower 8, lime powder tank 7 and activated carbon sprayed into the flue 13 are connected through pipelines in sequence;

[0043] 5) The Roots blower 8, the activated carbon tank 9 and the activated carbon sprayed into the flue 14 are sequentially connected through pipelines;

[0044] 6) The pipeline 15 connected from the compressed air tank is connected with the bag filter 3;

[0045] 7) The ash hopper of the bag filter 3 is connected with the fly ash bin pump 16 through pipelin...

specific Embodiment approach

[0046] The semi-dry process for treating sludge incineration tail gas is not only suitable for large and medium-sized sludge incineration plants in the field of sludge treatment, but also can be applied in other incineration fields such as solid waste, hazardous waste treatment, and domestic garbage. In conjunction with the accompanying drawings, the specific implementation is as follows:

[0047] (1) First, the incineration tail gas enters the semi-dry deacidification tower 1 through the incineration tail gas conveying pipeline 12, fully mixes with the absorbent (lime slurry) sprayed from the atomizing spray gun 11, and is rapidly cooled to about 150-170°C, reducing two The chance of oxin repolymerization creates favorable process conditions for efficient deacidification at the back end. Among them, the amount of sprayed water is automatically adjusted according to the temperature of the flue gas at the inlet of the tower to ensure the economy of the amount of liquid used. T...

Embodiment 2

[0057] A complete set of semi-dry method for treating sludge incineration tail gas, which mainly includes: removal of acid gas by semi-dry deacidification tower and expansion reactor; removal of organic matter (dioxin) and heavy metal by activated carbon; high-efficiency bag dust removal Capture dust, dioxins, volatile heavy metals and other organic pollutants on activated carbon particles. Contains the following steps:

[0058] (1) The incineration tail gas first enters the semi-dry deacidification tower, Ca(OH) 2 The solution is generally sprayed into the reactor by a nozzle or a rotary sprayer to form a lime slurry with extremely fine particle size. By means of the volatilization of water, the temperature of the tail gas is reduced and its humidity is increased, so that the acid gas in the tail gas reacts chemically with the absorbent to form Salts fall to the bottom of the tower and are discharged through the ash hopper.

[0059] A lime slurry preparation step is also in...

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Abstract

The invention relates to a device and a method for treating tail gas from sludge incineration through a semidry method, belonging to the field of solid wastes. The incineration tail gas passes through a semidry deacidification tower, thus the removing efficiency can reach about 90%, the use amount of chemicals is less, and sewage discharge is avoided; a flue in front of an expanded reactor is provided with a lime powder inlet, and the lime powder and the acid gas in the flue gas are subjected to full chemical reaction, thus the residue acid gas is removed; activated carbon serving as an adsorbent is injected, thus the removal rate of heavy metal and dioxin is further increased; an efficient bag filter is added to collect the Ca(OH)2 and powder of incomplete reaction, thus the removal rates of the heavy metal, dioxin and acid gas in the powder are effectively improved, the removal rate of the heavy metal (except mercury) reaches 99%, the emission of various pollutants can meet the environmental requirements, and the secondary pollution caused by incineration of the tail gas to the environment can be effectively solved.

Description

technical field [0001] The invention relates to a complete device and method for treating sludge incineration tail gas by a semi-dry method, belonging to the field of waste gas treatment. In particular, it relates to a complete set of equipment for harmless and stable purification treatment of harmful gases produced by sludge incineration process. Background technique [0002] With the rapid development of my country's economy and the acceleration of the urbanization process, the amount of urban sewage and wastewater treatment and the amount of sludge produced in my country have also increased rapidly. The tail gas produced by the sludge incineration process contains a large amount of pollutants (such as smoke, acid gas, heavy metals, etc.), which has become a hot issue in environmental protection. Various countries are formulating stricter emission standards for solid incineration tail gas, which will also Put forward higher requirements for sludge incineration process. T...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/10B01D53/50B01D53/70
Inventor 申维真蒋自力赵传军孟大为穆红岩刘玲徐兴华高光宇刘志伟方盛宇刘旭施良高明傅娆
Owner BMEI
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