CN103406011A - Equipment for treating burning tail gas of pesticide package waste - Google Patents

Abstract

The invention discloses equipment for treating burning tail gas of pesticide package waste. The equipment comprises an atomizing nozzle, a venturi tube mixer, a barrel and a cone, wherein the venturi tube mixer is vertically arranged; an upper air inlet end of the venturi tube mixer is connected with a smoke pipeline; the atomizing nozzle for atomizing alkali liquor is arranged at a central position of the smoke pipeline in front of the upper air inlet of the venturi tube mixer; the lower part of the venturi tube mixer is arranged in the barrel and is positioned at a central position of the barrel; the upper end of the barrel is closed; the upper part of the barrel is provided with a gas outlet; the lower end of the barrel is connected with the cone.

Description

A kind of equipment of pesticides packaging castoff burning vent gas treatment

Technical field

The invention belongs to flue gas and process the environmental protection equipment field, be specifically related to fume treatment auxiliary after a kind of pesticides packaging castoff burning, be mainly used in the flue gas removal that contains sour gas that pesticides packaging castoff burning processing procedure produces, the flue gas that can be used for existing burning facility transformation and newly-built burning facility is processed.

Background technology

A large amount of pesticides packaging discarded objects in current domestic generation need to carry out harmless treatment, and wherein burning disposal is comparatively effective processing method, for burning HCl, SO in the flue gas produced ₂, NO _X, P ₂O ₅Deng pollutant, need effectively to remove, the secondary pollution of avoiding tail gas to cause, domestic existing technology does not have the special equipment of purification for flue gas after the pesticides packaging castoff burning at present.The depickling neutralization of flue gas mainly contains wet method and two kinds of modes of semidry method, wherein the technological development of wet method depickling technology early, be widely used, technology is comparatively ripe, main by alkali lye spray washing flue gas, but exist generating sewage after spray, the wet method depickling secondary pollution problem such as need to again process, unsatisfactory in the minimizing of pollutant.The technology of semidry method depickling is in recent years risen gradually, namely pass through after the alkali lye atomization, spray in high-temperature flue gas, in and flue gas in sour gas in, moisture in alkali lye is evaporated by flue gas, after reaction, produce the inorganic salts crystallization, then separate and remove, the method has solved wet method depickling meeting and has produced the problem that sewage needs after-treatment.But, current domestic semidry method extracting tower mostly adopts the mode of Direct spraying in tower, the contact area of alkali lye and flue gas is little, mixed effect is poor, deacidifying flue gas efficiency is not high, and contains a large amount of sour gas, complicated component in the flue gas that the packing bag for agricultural chemical burning produces, harmfulness is large, needs a kind of special deacidification equipment of gas cleaning targetedly.

Summary of the invention

The objective of the invention is to propose a kind of semidry method neutralizing tower, develop a kind of efficiently and don't produce the deacidifying flue gas equipment of secondary pollution, solve specially the purified treatment problem of pesticides packaging waste incineration flue gas.

Purpose of the present invention can reach by following measures:

A kind of equipment of pesticides packaging castoff burning vent gas treatment, it comprises atomizer, Venturi tube mixer, cylindrical shell and centrum, described Venturi tube mixer vertically arranges, the top air inlet end of Venturi tube mixer is connected with flue gas pipeline, described atomizer for fogged lye is installed on the front flue gas pipeline center of Venturi tube mixer top air inlet, the bottom of described Venturi tube mixer is arranged in described cylindrical shell and is positioned at the center of cylindrical shell, described cylindrical shell upper end closed, the top of cylindrical shell is provided with gas outlet, the lower end of cylindrical shell is connected with described centrum.

This equipment can be divided into air inlet mixing section and cyclonic separation section, and wherein atomizer and Venturi tube mixer belong to the air inlet mixing section, and cylindrical shell and centrum belong to the cyclonic separation section.Between air inlet mixing section and cyclonic separation section, adopt flange, welding or other modes to connect.

The atomizer of air inlet mixing section can be fixedly connected with flue gas pipeline or Venturi tube mixer by flange.Atomizer is dual-medium nozzle, and its entrance is connected with the alkali lye carrier pipe with the atomizing medium pipe respectively.Atomizer be take compressed air or high steam and is atomizing medium, before the alkali lye nozzle is mounted on Venturi tube by flange (by the flow of flue gas direction), alkali lye through nozzle atomization sprays at a high speed Venturi tube, for the gas-liquid mixed in Venturi tube provides part power, greatly reduce the pressure loss of flue gas, alkali lye nozzle material can adopt the 316L stainless steel.

The blast tube diameter D of atomizer (1) _y(mm) be calculated as follows:

$D_z=18.8\×\sqrt{\frac{Q_z}{{\mathrm{\ρ}}_z{v}_z}}---\left(\mathrm{III}\right)$

Q _z-flux of alkaline liquor, kg/h,

Ρ _zThe density of-alkali lye;

V _z-alkali lye flow velocity;

The atomization radius r (mm) of atomizer (1) ejection is calculated as follows:

$r=\frac{0.209}{\mathrm{\ρ\Δi}}\×{10}^6---\left(\mathrm{IV}\right)$

ρ-at the end Alevaire the density that expands, m ³/ kg;

Alevaire specific energy landing before and after Δ i-expansion eventually, Δ i=i ₁-i ₂, KJ/kg.

Venturi tube mixer is placed in the cylindrical shell top, flue gas acutely mixes in Venturi tube mixer with fogged lye, sour gas in flue gas and alkali lye generation neutralization reaction generate inorganic salts, moisture in alkali lye is gasified totally by the high-temperature flue gas heating, the inorganic salts crystallization forms the salt powder and air-flow flows jointly, and the Venturi tube mixer material is 316 stainless steels.

The caliber Dy(mm of Venturi tube mixer (2)) be calculated as follows:

$D_y=18.8\×\sqrt{\frac{Q_y}{v}}---\left(I\right)$

Qy-flue gas and atomization gas are by the actual flow of pipeline section, m ³/ h,

V-flue gas and atomization gas are by the flow velocity of pipeline section, m/s;

The resistance Py(Pa of described Venturi tube mixer (2)) be calculated as follows:

Py=0.6×10 ^-4v _r ²L (II)

V _r-flue gas and atomization gas be by the flow velocity of trunnion, m/s,

L-liquid gas volume ratio, l/m ³.

Cylindrical shell is cylindrical structure, and its interior diameter is greater than the diameter of described Venturi tube mixer lower surface.Centrum is the hollow cone platform structure that the upper surface area is greater than the lower surface area.Outside described cylindrical shell and/or centrum is provided with bracing frame.The cyclonic separation section adopts 316 stainless steels to make, and mainly cylindrical shell, centrum, gas outlet, bracing frame, consists of.The air-flow that contains inorganic salts enters cylindrical shell from tangential inlet, and air-flow is rotated down and moves along outer wall, arrives the centrum backward upper rotation in bottom, flows out finally by discharge pipe, and the inorganic salts powder moves down after outer wall in the effect of centrifugal force, falls along wall, enters flue-dust retainer.

The flow velocity vi (m/s) of cylindrical shell (4) import is calculated as follows:

$\mathrm{vi}=\sqrt{2\mathrm{\Δp}}/\sqrt{\mathrm{\ϵ\ρ}}---\left(V\right)$

Δ p-allowable pressure drop, Pa,

ρ-smoke density, kg/m ^3,

ε-resistance coefficient,

Cylindrical shell (4) import sectional area A (m ²) be calculated as follows:

A=Qy/3600vi （VI）

Barrel diameter D(m) be calculated as follows:

$D=2.22\sqrt{A}---\left(\mathrm{VII}\right).$

High-efficient atomizing dual-medium nozzle, Venturi tube mixer, cyclone separator technology are merged in the present invention, develop the semidry method neutralizing tower.The operation principle of this equipment is: at first, utilize efficient atomizer, take compressed air or high steam is power, by nozzle, be to spray into Venturi tube mixer after the fine droplet of 5～50 μ m by the alkali lye atomization, alkali lye after flue gas and atomization acutely mixes in Venturi tube, and take full advantage of the power of high velocity jet alkali lye, sour gas in flue gas and alkali lye generation neutralization reaction generate inorganic salts, moisture in alkali lye is simultaneously by the high-temperature flue gas heating evaporation, the inorganic salts crystallization that reaction generates also separates with flue gas by cyclone separator, thereby realize the purpose of not only removing acid gas in flue gas but also not producing sewage.

Beneficial effect of the present invention: the present invention fully adopts Venturi tube mixing wastewater with air principle, the height that reaches air water mixes, utilize again the power of compressed air as fogged lye, solved the large shortcoming of venturi scrubber flue gas loss in head, than conventional Venturi tube loss in head, reduce more than 50%, greatly reduce the energy consumption of flue gas blower fan, on the other hand, the fine droplet formed after the compressed air atomizing of alkali lye and the contact area of flue gas are large, alkaline matter in alkali lye is reacted fully with the sour gas in flue gas, evaporation rapidly after the moisture heat absorption in alkali lye, prevent that the moisture evaporation from not exclusively forming sewage, have the advantage that wet dedusting efficiency is high and dry method dust produces without sewage concurrently, simultaneously, because the moisture evaporation can reduce flue-gas temperature, can be by controlling concentration and the flux of alkaline liquor of alkali lye, control the temperature of fume emission, a kind of efficient, energy-conservation, environmental protection, the equipment that the incineration tail gas of automation is processed.

The accompanying drawing explanation

Fig. 1 is the structural representation of present device.

In figure, the 1-atomizer; The 2-Venturi tube mixer; The 3-gas outlet; The 4-cylindrical shell; The 5-centrum; The 6-bracing frame.

The specific embodiment

Below in conjunction with drawings and Examples, content of the present invention is described further.

As shown in Figure 1, the equipment of this pesticides packaging castoff burning vent gas treatment comprises atomizer 1, Venturi tube mixer 2, cylindrical shell 4, centrum 5 and bracing frame 6.Wherein atomizer 1 and Venturi tube mixer 2 are the air inlet mixing section, and cylindrical shell 4, gas outlet 3, centrum 5 and bracing frame 6 are the cyclonic separation section.

Venturi tube mixer 2 vertically arranges, the top air inlet end of Venturi tube mixer is connected with flue gas pipeline, atomizer 1 for fogged lye is installed on the front flue gas pipeline center of Venturi tube mixer top air inlet, it is connected on flue gas pipeline by flange, atomizer 1 connects compressed air and alkali lye, nozzle is detachable, and control valve is arranged before nozzle, the adjustable nozzles flow.

The bottom of Venturi tube mixer 2 is arranged in cylindrical shell 4 and is positioned at the center of cylindrical shell, described cylindrical shell 4 upper end closeds, and the top of cylindrical shell 4 is provided with gas outlet 3, and the lower end of cylindrical shell is connected with described centrum 5.Cylindrical shell 4 is cylindrical structure, and its interior diameter is greater than the diameter of described Venturi tube mixer lower surface.Centrum 5 is greater than the hollow cone platform structure of lower surface area for the upper surface area.In the outside of described cylindrical shell and/or centrum, be provided with bracing frame 6.

This equipment is mainly high temperature resistant and anticorrosion to material requirements; The alkali lye nozzle requires also relatively very high to machining accuracy and assembly precision.According to above requirement, aspect selection: atomizer, Venturi tube mixer, cylindrical shell, centrums etc. are adopted 316 stainless steels.Aspect machining, the alkali lye nozzle adopts the higher and reliable numerically controlled processing equipment of machining accuracy to process; Remainder adopts common cold welding assembling; Aspect the equipment assembling, select the knack assembler to assemble

The use procedure of this equipment is as follows: the alkali lye nozzle adopts dual-medium nozzle, take compressed air or high steam is atomizing medium, alkali lye through nozzle atomization sprays at a high speed Venturi tube, for the gas-liquid mixed in Venturi tube provides part power, flue gas acutely mixes in Venturi tube mixer with fogged lye, sour gas in flue gas and alkali lye generation neutralization reaction generate inorganic salts, moisture in alkali lye is gasified totally by the high-temperature flue gas heating, and the inorganic salts crystallization forms the salt powder and air-flow flows jointly.The air-flow that contains inorganic salts enters cylindrical shell from tangential inlet, and air-flow is rotated down and moves along outer wall, arrives the centrum backward upper rotation in bottom, finally by discharge pipe, flow out, the inorganic salts powder moves down after outer wall in the effect of centrifugal force, falls along wall, enters the flue-dust retainer under centrum.

Claims (9)

1. the equipment of a pesticides packaging castoff burning vent gas treatment, it is characterized in that it comprises atomizer (1), Venturi tube mixer (2), cylindrical shell (4) and centrum (5), described Venturi tube mixer (2) vertically arranges, the top air inlet end of Venturi tube mixer (2) is connected with flue gas pipeline, described atomizer (1) for fogged lye is installed on the front flue gas pipeline center of Venturi tube mixer (2) top air inlet, the bottom of described Venturi tube mixer (2) is arranged in described cylindrical shell (4) and is positioned at the center of cylindrical shell (4), described cylindrical shell (4) upper end closed, the top of cylindrical shell (4) is provided with gas outlet, the lower end of cylindrical shell (4) is connected with described centrum (5).

2. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that described atomizer (1) is fixedly connected with flue gas pipeline or Venturi tube mixer (2) by flange.

3. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that described atomizer (1) is dual-medium nozzle, and its entrance is connected with the alkali lye carrier pipe with the atomizing medium pipe respectively.

4. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that described cylindrical shell (4) is cylindrical structure, and its interior diameter is greater than the diameter of described Venturi tube mixer (2) lower surface.

5. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that described centrum (5) is greater than the hollow cone platform structure of lower surface area for the upper surface area.

6. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that being provided with bracing frame (6) in the outside of described cylindrical shell (4) and/or centrum (5).

7. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that the caliber Dy(mm of described Venturi tube mixer (2)) be calculated as follows:

$D_y=18.8\×\sqrt{\frac{Q_y}{v}}---\left(I\right)$

Qy-flue gas and atomization gas are by the actual flow of pipeline section, m ³/ h,

V-flue gas and atomization gas are by the flow velocity of pipeline section, m/s;

The resistance Py(Pa of described Venturi tube mixer (2)) be calculated as follows:

Py=0.6×10 ^-4v _r ²L (II)

V _r-flue gas and atomization gas be by the flow velocity of trunnion, m/s,

L-liquid gas volume ratio, l/m ³.

8. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1, is characterized in that the blast tube diameter D of described atomizer (1) _y(mm) be calculated as follows:

$D_z=18.8\×\sqrt{\frac{Q_z}{{\mathrm{\ρ}}_z{v}_z}}---\left(\mathrm{III}\right)$

Q _z-flux of alkaline liquor, kg/h,

Ρ _zThe density of-alkali lye;

V _z-alkali lye flow velocity;

The atomization radius r (mm) of atomizer (1) ejection is calculated as follows:

$r=\frac{0.209}{\mathrm{\ρ\Δi}}\×{10}^6---\left(\mathrm{IV}\right)$

ρ-at the end Alevaire the density that expands, m ³/ kg;

Alevaire specific energy landing before and after Δ i-expansion eventually, Δ i=i ₁-i ₂, KJ/kg.

9. the equipment of pesticides packaging castoff burning vent gas treatment according to claim 1 is characterized in that the flow velocity vi (m/s) of described cylindrical shell (4) import is calculated as follows:

$\mathrm{vi}=\sqrt{2\mathrm{\Δp}}/\sqrt{\mathrm{\ϵ\ρ}}---\left(V\right)$

Δ p-allowable pressure drop, Pa,

ρ-smoke density, kg/m ^3,

ε-resistance coefficient,

Cylindrical shell (4) import sectional area A (m ²) be calculated as follows:

A=Qy/3600vi （VI）

Barrel diameter D(m) be calculated as follows:

$D=2.22\sqrt{A}---\left(\mathrm{VII}\right).$

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