CN206014705U - Burnt lime digester, quicklime slaking and dust arrester and system - Google Patents

Abstract

Quicklime digester, quicklime digestion and dust removal device and system, which includes quicklime digester, water bath dust collector, ventilation device, chimney, dust removal sewage treatment device, sludge treatment device, cleaning device, slaked lime conveying device, mixer. Lime digester, which includes: feed inlet, sealed conveying section box, first digestion section box, water spray device, sealed dust cover, upper digestion box feeding place and poking opening, second digestion section box , the feeding place and the opening of the second digestion box, the third digestion section box, and the discharge port; a pair of first stirring shafts with stirring blades are installed in the first digestion section box, and the first stirring shaft passes through the first Driven by a driving device; a pair of second stirring shafts with stirring blades are installed in the second digestion section box, and the second stirring shaft is driven by the second driving device; a pair of stirring blades with stirring blades are installed in the third digestion section box The third stirring shaft is driven by the third driving device.

Description

Quicklime digester, quicklime digestion and dedusting device and system

technical field

The utility model relates to the field of quicklime digestion in iron and steel sintering plants, in particular to a quicklime digester, quicklime digestion and dust removal device and system. It mainly solves the problem of environmental pollution caused by quicklime digestion and dust removal.

Background technique

With the development of modern industry and the improvement of people's quality of life, the requirements for environmental protection are getting higher and higher. Safe production and clean production have become the symbol of modern enterprise civilization.

In the iron and steel metallurgical industry, it is generally necessary to sinter iron ore before entering the blast furnace for ironmaking, and quicklime plays an important role in the sintering process. First, it improves the granulation effect of the mixed material and improves the air permeability of the material layer. Compared with before digestion, the particle size of the mixture > 3mm increases by more than 10%, which can increase the utilization factor of the sintering machine by 3%-5%. Second, the sinter pellets containing Ca(OH) ₂ have a higher Humidity capacity, so it has good thermal stability during the sintering process, can resist the destructive effect of the drying zone, and reduce the influence of the over-humidity layer; thirdly, increase the material temperature; fourthly, reduce the consumption of solid fuel. Studies have shown that due to the increase of material temperature and the improvement of granulation efficiency, the output of sinter can be increased by about 10%, and coke powder can be saved by 1.5kg/t; at present, quicklime has become one of the main fluxes in sinter plants, and the proportion is 3%- 5%.

The current use of quicklime in sintering is not ideal, and there are mainly the following problems:

1. Single-stage digesters are generally used in sintering plants, with short digestion time and low digestibility. Undigested quicklime continues to be digested in the first mixing and second mixing. When the quicklime is digested, the volume expands by 1 to 1.5 times, which destroys the granulated balls that have been formed into balls, affects the air permeability of the material layer, and does not give full play to the digestion of the quicklime.

Second, there is no special digestion and dust collector. When quicklime is digested, a large amount of dust-laden flue gas will be produced. Due to the particularity of the flue gas characteristics, the dust removal effect of ordinary dust collectors cannot meet the national emission concentration standards, and due to the strong adhesion of lime dust, it is easy to cause blockage of dust removal pipes, Fan vibration, etc.

3. In addition, dust removal sewage, steelmaking sludge, dust removal sludge, etc. have not been effectively treated, resulting in waste and secondary pollution.

The existence of the above problems seriously affects the digestion of quicklime, dust removal, and the treatment of sewage sludge. In order to solve the problem of quicklime digestion and dust removal in sintering and further improve the energy saving and emission reduction work in the sintering process, it is necessary to design a quicklime digestion and dust removal system to solve the problem of poor digestion of quicklime and solve the problem of dust removal caused by quicklime digestion.

Utility model content

The purpose of the utility model is to provide a high-efficiency quicklime digester to solve the problems of low digestion efficiency and poor digestion effect of the digester, as well as the pollution of a large amount of dust and smoke.

The utility model provides a high-efficiency quicklime digester, which is a multi-stage digester and provides a perfect multi-stage digestion process. The quicklime falls from the ash bin on the belt scale under the bin, and then is sent into the multi-stage digester by a screw conveyor. digestion in the digester.

The digester described in this application is a multi-stage digester, that is, the digestion section has two or more sections, upper and lower.

Another purpose of this utility model is to provide a high-efficiency quicklime digestion and dust removal system to solve the problems of insufficient quicklime digestion, low dust removal efficiency of the digester, blockage of dust removal pipes, fan vibration, dust removal sewage treatment and other problems.

To solve the dust removal problem of lime digester, it is necessary to understand the process of lime digestion and the physical and chemical characteristics of dust. Lime digestion is a chemical reaction process, that is, quicklime (CaO) plus water (H ₂ O) generates calcium hydroxide (Ca(OH) ₂ ) and releases a large amount of heat. The main components of the dust produced by the digester are CaO, Ca(OH) ₂ and water vapor. During the dust collection and treatment process, calcium hydroxide (Ca(OH) ₂ ) reacts with carbon dioxide in the air to form calcium carbonate (CaCO ₃ ), and Ca(OH) ₂ and CaCO ₃ are easily adhered to the dust collector. And on the wall of the dust removal pipe, this is the real cause of the blockage of the dust collector and the dust removal pipe, and the vibration of the fan.

The utility model provides a high-efficiency quicklime digestion and dust removal system to solve the problems in the prior art of insufficient quicklime digestion, lime dust collection, dust collector and dust removal pipeline blockage, fan vibration, dust removal waste water recycling and the like.

According to the first embodiment of the present utility model, a two-stage quicklime digester is provided, which includes: a feed inlet, a sealed conveying section box whose front end communicates with the feed inlet, and communicates with the rear end of the sealed conveying section box The first digestion section box, the water spray device located on the upper or side of the first digestion section box; the sealed dust cover located on the top of the first digestion section box, located in the first digestion section box and away from the feed port The lower end of the upper digestion box and the opening of the feed opening, the second digestion section box located below the first digestion section box, and the discharge at the end of the second digestion section box near the feed inlet Mouth; wherein: a pair of first stirring shafts with stirring blades are installed in the first digestion section box, both of the pair of first stirring shafts are driven by the first driving device and the rotation directions of the two are opposite; in addition , a pair of second agitating shafts with stirring blades are installed in the second digestion section casing, both of the pair of second agitating shafts are driven by the second driving device and the rotation directions of the two are opposite; and, sealing and dust removal The cover has an external interface for dust collection.

According to the second embodiment of the present utility model, a three-stage quicklime digester is provided, which includes: a feed inlet, a sealed delivery section box whose front end communicates with the feed inlet, and communicates with the rear end of the sealed delivery section box The first digestion section box, the water spray device located on the upper or side of the first digestion section box; the sealed dust cover located on the top of the first digestion section box, located in the first digestion section box and away from the feed port The lower part of the upper digestion box and the feed opening at the end of the upper digestion section, the second digestion section box located below the first digestion section box, and the second digestion section box at the end of the second digestion section box near the feed inlet The feeding place of the digestion box and the opening (that is, the discharge port), the third digestion section box located below the second digestion section box, and the outlet at the end of the third digestion section box that is far away from the feed port. Feed opening; wherein: a pair of first stirring shafts with stirring blades are installed in the first digestion section box, the pair of first stirring shafts are driven by the first driving device and the rotation directions of the two are opposite; A pair of second stirring shafts with stirring blades are installed in the second digestion section casing, both of the pair of second stirring shafts are driven by the second drive device and the rotation directions of the two are opposite; in the third digestion section A pair of third agitating shafts with stirring blades are installed in the box, both of the pair of third agitating shafts are driven by the third driving device and the rotation directions of the two are opposite; and, the sealed dust cover has a dust collection external interface .

In the above two embodiments, preferably, one of the second stirring shafts is located directly below one of the first stirring shafts, and the rotation directions of the two are opposite.

Further preferably, one of the second stirring shafts is located directly below one of the first stirring shafts, and both of them rotate in opposite directions, and one of the third stirring shafts is located directly below one of the second stirring shafts , and they rotate in opposite directions.

Preferably, the input end of the water spray device is externally connected to the initial water supply pipeline, and the output end is connected to a plurality of retractable sprinkler heads located in the upper part of the first digestion section box interior space through an automatic flowmeter water valve; preferably, the automatic flow rate The water metering valve is electrically connected to the master control room so as to automatically control the water volume and has a cut-off function; further preferably, a plurality of retractable sprinkler heads are stretched and adjusted according to the length of the digestion section box, and the lengths are staggered.

In addition, the initial water supply pipe of the sprinkler is connected to the hot water outlet of the external heat exchanger. The heat exchanger has a cold water inlet and a hot water outlet as well as a hot heating gas inlet and a heat exchanged cooling gas outlet. As shown in Figure 2a.

Preferably, the height of the sealed dust-removing hood provided above the box body of the first digestion section gradually increases along the material conveying direction of the box. The pipes of the dust removal system are connected.

Preferably, a digestion box inspection device is also provided on the casing of the two-stage quicklime digester or the three-stage quicklime digester, and the inspection device includes one or more digestion box inspection device doors and one or more digestion box inspection doors. The movable connection mechanism of the device door; preferably, one or more digestive tank maintenance device door movable connection mechanisms are installed at the bottom of the second tank or at the bottom of the second tank and the third tank respectively, The bottom of the door of the digestion box inspection device is connected to the movable connection mechanism of the door of the digestion box inspection device, and the door can rotate around the movable connection mechanism. The upper part of the inspection device door can be opened and closed,

In this application, a two-stage digester may also be referred to as an upper and lower two-stage digester, and a three-stage digester may also be referred to as an upper and lower three-stage digester.

The length of the two-stage or three-stage digester in this application is generally 3-30m, preferably 4-20m, more preferably 5-10m. The two-stage or three-stage digester in this application can be supported on a stand or mounted on a pedestal.

According to a third embodiment of the present utility model, there is provided quicklime digestion and dedusting device, which comprises any one of the above-mentioned digester and water bath deduster, the latter communicates with the dust collection external interface of the digester through a dedusting pipeline;

Among them, the water bath dust collector includes:

Dust removal pool;

The dust collector housing located above the dust removal pool;

Dust removal pipe,

It is characterized in that one end of the dust removal pipeline is externally connected to the output end of one or more dust-containing gas collection devices (such as the dust removal interface of the lime digester), and the other end passes through the dust collector shell from top to bottom and extends into the dust collector shell In the dust removal pool below the body, one end of the dust removal pipeline extending into the dust removal pool is provided with a submerged pipeline nozzle, wherein the end of the submerged pipeline nozzle is a mesh structure or a porous structure; Through the middle (ie along the central axis).

Preferably, the dust remover also includes: an overflow water seal pool located on one side of the dust removal pool, and a water level adjustment hole opened at the lower end of one side of the dust collector housing between the dust removal pool and the overflow water seal pool; more preferably Yes, there is a card slot and a water level adjustment device on the outside of the dust collector housing next to the water level adjustment hole. The water level adjustment device includes a water level adjustment plate, a screw rod, and a control valve. The water level adjustment plate is placed in the card slot. One end of the screw rod is connected with the water level regulating plate, and the other end of the screw rod is connected with the regulating valve, wherein the vertical width of the water level regulating plate is slightly larger than the vertical width of the water level regulating hole.

Preferably, the dust collector also includes: a cover plate arranged above the overflow water sealing pool, one end of the cover plate is connected with the dust collector housing, and the other end is inserted into the overflow water sealing pool; more preferably, there is a A through hole through which the screw rod passes. The screw rod moves up and down along the through hole through the action of the regulating valve, thus driving the water level regulating plate to move up and down.

Preferably, an overflow pipe is provided on the upper part of the overflow water-sealed pool for adjusting the water level in the overflow water-sealed pool; more preferably, an overflow pipe valve is provided on the overflow pipe.

Preferably, a water supply pipe is provided on the dedusting water pool to replenish water in the dedusting water pool; preferably, a water supply pipe valve is provided on the water supply pipe.

Preferably, the bottom of the dust removal pool is funnel-shaped or "V"-shaped or in the shape of an inverted cone, and a sewage sludge discharge device is provided at the bottom of the dust removal pool; more preferably, a water pressure gauge is also provided in the sewage sludge discharge device.

Preferably, a support is provided above the dust removal pool in the dust collector housing, a first group of wire mesh (preferably V-shaped filter screen or V-shaped wire mesh) as the bubble puncture point is arranged below the support and above the support A second group of wire meshes (preferably inverted V-shaped wire meshes) is provided; preferably, the first group of wire meshes and/or the second group of wire meshes are staggered and obliquely arranged, and sealing cards are provided at intersections.

Preferably, a sprinkler head is arranged above the second group of wire meshes for spraying dedusting water or dedusting liquid on the second group of wire meshes; A clean air outlet is arranged on the housing of the dust collector above the demister plate.

Preferably, the dust collector further includes a control system, the water pressure gauge, the overflow pipe valve and the water supply pipe valve are connected to the control system, and the control system controls the water pressure gauge, the overflow pipe valve and the water supply pipe valve.

The water bath deduster described in this application can be installed or arranged on a base, or supported on a load-bearing support. Generally, the shell side of the water bath dust collector is cylindrical or elliptical, that is, the cross section of the shell side of the water bath dust collector is circular or elliptical. It can also be in the shape of a quadrangular prism, that is, the cross section of the shell side of the water bath dust collector is rectangular or square. The height of the main body of the water bath dust collector (that is, the height of the entire shell) is generally 1.2m-10m, preferably 1.5-7m, more preferably 2.0-5m.

According to another aspect of the present invention, there is provided a quicklime digestion and dedusting method using the above-mentioned digestion and dedusting device comprising a two-stage quicklime digester, the method comprising the following steps:

1) Quicklime digestion: Put quicklime into the feed port of the two-stage quicklime digester, and transport it to the first digestion section box through the sealed conveying section box, and pass through the upper or side of the first digestion section box body. The water spray device sprays water on the quicklime material moving in the first digestion section so that the quicklime is mixed and digested while moving under the stirring action of the stirring shaft, and then enters the second digestion section box again under the stirring action of the stirring shaft Further mixing and digestion take place while moving, and the digested quicklime is discharged through the discharge port at the bottom of the quicklime digester; and

2) Dedusting of dust-containing gas: the dust-containing gas in the sealed dust-removing hood is output from the dust-collecting outer interface of the sealed dust-removing hood to the dust-removing pipeline of the water-bath dust collector, and the dust-containing gas is sprayed into The water in the dedusting pool is dedusted by contacting with water, and the dedusted gas is discharged from the clean air outlet provided on the deduster housing.

According to still another aspect of the present utility model, there is provided a quicklime digestion and dust removal method using the above-mentioned digestion and dust removal device including a three-stage quicklime digester, the method comprising the following steps:

1) Quicklime digestion: Put quicklime into the feed port of the third-stage quicklime digester, and then transport it to the first digestion section box through the sealed conveying section box, and pass through the upper or side of the first digestion section box. The water spray device sprays water on the quicklime material moving in the first digestion section so that the quicklime is mixed and digested while moving under the stirring action of the stirring shaft, and then enters the second digestion section box again under the stirring action of the stirring shaft Further mixing and digestion occurs while moving, and then enters the third digestion section box again under the agitation of the stirring shaft, further mixing and digestion occurs while moving, and the digested quicklime is discharged through the discharge port at the bottom of the quicklime digester ;with

2) Dedusting of dust-containing gas: the dust-containing gas in the sealed dust-removing hood is output from the dust-collecting outer interface of the sealed dust-removing hood to the dust-removing pipeline of the water-bath dust collector, and the dust-containing gas is sprayed into The water in the dedusting pool is dedusted by contacting with water, and the dedusted gas is discharged from the clean air outlet provided on the deduster housing.

A method for using a water-bath dust collector or a method for using the above-mentioned water-bath dust collector to remove dust, the method comprises the following steps:

(1) Store water in the dust removal pool through the water supply pipe, adjust the water level adjustment plate, make the water level in the dust removal pool reach the predetermined value, and close the water supply pipe valve;

(2) Dust-containing gas (such as dust and flue gas from the dust removal interface of the quicklime digester) enters the dust collector from top to bottom through the dust removal pipe from the middle of the dust collector shell. According to the nature of the flue gas and the flow rate of the flue gas, Adjust the water level adjustment device so that the dust removal pipe is inserted into a certain position (for example, 0.2-0.8m) in the dust removal pool, and the end of the dust removal pipe inserted into the water is equipped with a submerged pipe nozzle with a mesh structure or a porous structure;

(3) (with a certain speed) the dust-laden gas flows through the dust removal pipe and is sprayed out at the nozzle of the submerged pipe (at a higher speed). After impacting the water layer, it enters the water. Due to the effect of inertia, it continues to move in the original direction, and most of the dust particles adhere to the water and stay in the water. The flue gas hits the water body and is cut into small bubbles by the network structure of the nozzle of the submerged pipeline, which increases the interaction between the flue gas and water. The contact area strengthens the capture of dust by the dedusting water, and realizes the first-level impact water bath dedusting;

(4) After water bath dedusting, most of the dust in the flue gas is removed, and the remaining part of the fine particle dust passes through the first set of wire mesh to form the first water film and the second set of wire mesh to form the second water film. The water membrane captures the fine dust in the flue gas to realize the second-stage filter water membrane dedusting, and the purified gas is discharged from the outlet after being treated by the water retaining and defogging plate.

(5) After a long period of dust removal in the dust removal pool, it has become sewage. The sewage is discharged from the sewage sludge discharge device at the bottom of the funnel-shaped or "V"-shaped dust removal pool, and water is replenished from the water supply pipe.

In the utility model, the nozzle of the submerged pipeline extends into a certain position in the dust removal pool at the bottom of the housing, and the insertion depth is related to the nature of the dust, generally 20-80cm. If the dust density is high and the particles are coarse, the insertion depth is, for example, 20-50cm; if the dust density is small and the particles are fine, the insertion depth is 30-80cm. The contact between air and water improves the dust removal efficiency.

In the utility model, when the dust-containing gas or flue gas is introduced, the water level in the dust removal pool will be raised, and the water that is too high can flow from the water level adjustment hole to the overflow pool arranged outside the adjustment plate, which can make the dust removal pool The water level in the tank is kept at an appropriate height, which not only allows the smoke to be drawn in smoothly, but also ensures the water-free depth of the nozzle;

In the utility model, a bracket is arranged above the dust removal pool in the housing, and a first group of wire mesh is arranged below the bracket. The air bubbles pierce and disperse the airflow. An inverted V-shaped second group of wire mesh is arranged above the support. The second group of wire meshes are arranged in a staggered and inclined manner. Sealing cards are arranged at the intersections, and sprinklers are arranged above the wire meshes, which are used to spray dedusting liquid on the wire meshes, forming a downward-flowing water film on the wire meshes, and then flowing to the The air bubbles under the bracket pierce the net to form a second water film to fully capture dust.

In the utility model, the dust collector is equipped with a water level adjustment device, and the water level adjustment function is realized by adjusting the height of the water level adjustment plate. Drain from the water level adjustment hole to the overflow water seal pool to ensure that the water depth of the nozzle of the submerged pipeline is stable within a certain range, so as to protect the fan from burning the motor due to a sudden increase in resistance. When the dust collector is in normal operation, the adjustment valve of the water level adjustment device can be used to control the adjustment plate to move up and down to adjust the water level, and the water depth of the nozzle can be controlled online to ensure the stable and efficient operation of the equipment.

A high-efficiency quicklime digestion and dust removal system, which includes a digester, a water bath dust collector, and also includes an exhaust device, a chimney, a dust removal sewage treatment device, a sludge treatment device, a cleaning device, a slaked lime conveying device and a mixer, and the water bath dust collector passes through A dust removal pipe is connected with the dust collection external interface of the digester; the slaked lime conveying device is located at the discharge port of the digester, the mixer is connected with the slaked lime conveying device, the clean air outlet of the water bath dust collector is connected with the chimney through the exhaust device, and the water bath The overflow pipe of the dust collector is connected to the dust removal sewage treatment device, the sewage sludge discharge device at the bottom of the dust removal pool is connected to the sludge treatment device, and the dust removal sewage treatment device is connected to the cleaning device.

Optionally, the dedusting sewage treatment unit is connected with the sludge treatment unit.

Preferably, the sludge treatment device includes a filter press water outlet and a filter press sludge outlet, the filter press water outlet is connected to the cleaning device, and the filter press sludge outlet is connected to the digester.

In the utility model, the digester is a multi-stage quicklime digester, for example: two-stage quicklime digester, three-stage quicklime digester. Dust removal and sewage treatment equipment includes mixing tanks, sedimentation tanks, clear water tanks, pipeline equipment, etc. Sludge treatment equipment includes filter press equipment, crushing equipment, etc.

A quicklime digestion, dust removal and sewage treatment process, comprising the following steps:

(1) quicklime digestion: put quicklime into quicklime digester and use water to digest quicklime;

(2) Dedusting of dust-containing gas: the dust-containing gas discharged from the quicklime digester is output to the water bath dust collector for dust removal, and the dust removal sewage in the dust removal pool at the bottom of the water bath dust collector is discharged into the stirring tank;

(3) The sewage in the stirring tank is transferred to the sedimentation tank and is optionally transported to the quicklime digester for digestion water. In the sedimentation tank, the sewage is precipitated and layered. The upper layer is sedimentation water and the lower layer is sedimentation sewage. mud;

(4) The sedimentation water in the settling tank is transferred to the clear water tank, and the water in the clear water tank is delivered to the cleaning device by the clear water pipeline with the clear water pump, and optionally the water in the clear water tank is delivered to the quicklime digester for use as water for digestion;

(5) The sedimented sludge in the sedimentation tank is filtered through the filter press device to form press filter sludge and press filter water, and the press filter water is transported to the quicklime digester for digestion water or sent to the stirring tank, press filter The sludge is crushed and sent to the ash bin or mixing tank or sent to the quicklime digester.

Preferably, in the step, the purified gas after the dusty gas is treated by the dust collector is transported to the chimney by the exhaust fan for discharge.

Preferably, the chimney is also provided with a secondary dust removal device and a moisture collection device.

Preferably, the cleaning device cleans the entire equipment, and preferably, the collected sewage after cleaning is introduced into the stirring tank. The whole equipment includes stirring tank, mixer, sedimentation tank, clean water tank, clean water pump, clean water pipeline, filter press device, exhaust fan, dust collector, steelmaking sludge, sludge pump, quicklime digester or pipeline, optional other equipment .

Preferably, a stirrer is arranged above the stirring tank.

Preferably, the steelmaking sludge is transported to the quicklime digester by a sludge pump.

Preferably, the external supplementary water is optionally transported to the quicklime digester, dust collector or clean water tank through the supplementary water pipeline. Preferably, the supplementary water is delivered to the exhaust fan through the supplementary water pipeline for cleaning the exhaust fan.

Preferably, a float valve is provided in the clean water pool to control the amount of water replenishment and maintain the dynamic balance of water in the system.

In the utility model, the cleaning of pipelines and equipment: the main components of lime digester dust are CaO, Ca(OH) ₂ and water vapor. This dust has strong cohesion in high temperature and humid environment. When the gas passes through the dust removal pipe, it will stick to the inner wall of the pipe and gradually thicken until it is blocked. Under normal circumstances, the dust removal pipe can remain unblocked for less than a month. In order to prevent the dust removal pipeline from being blocked, it is necessary to clean the pipeline in time, and a cleaning device is designed on the pipeline. In order to prevent pipeline blockage, the dust removal pipeline design should minimize the horizontal pipeline and shorten the pipeline distance, and consider the installation location and maintenance platform of the cleaning device. The gas purified by the water-bath dust collector still contains a small amount of lime dust and a large amount of water vapor. The humid gas is very easy to cause dust accumulation and scaling on the fan blades. When the dust accumulation on the blades reaches a certain thickness, it will partially fall off, resulting in damage to the balance of the impeller. The fan vibrates. In order to solve the above-mentioned frequent problems, dust cleaning holes are set on the fan casing to regularly clean the dust accumulated on the fan impeller; balance.

The utility model can completely solve a series of problems such as the low digestion efficiency of the existing digester, the low efficiency of the dust collector, the blockage of the dust removal pipeline, the vibration of the fan, and the recycling of sewage sludge, so as to ensure the long-term stable operation of the dust removal system. The digestibility of quicklime is very high, and the collection effect of dust and water vapor will reach more than 99%. The emission concentration of flue gas and dust after purification is far lower than the emission standard stipulated by the state, and the purpose of energy saving and environmental protection is also achieved.

In the utility model, the dust collected by the quicklime digester can also be sent to the dust removal device through the dust removal pipeline together with the dust removal at other points.

The using method of three-stage quicklime digester, this method comprises the following steps:

(1) Lime digestion: put the quicklime into the feed port of the three-stage quicklime digester, and transport it to the first digestion section box through the sealed delivery section box;

(2) Spray water on the quicklime material moving in the first digestion section box through the water spray device located on the upper or side of the first digestion section box, so that the quicklime is mixed and digested while moving under the agitation of the stirring shaft ;

(3) After entering the second digestion section box, further mixing and digestion occur while moving under the agitation of the stirring shaft;

(4) After entering the third digestion section box, further mixing and digestion will occur while moving under the stirring action of the stirring shaft, and the digested quicklime will be discharged through the discharge port at the bottom of the quicklime digester.

Preferably, a pair of first stirring shafts with stirring blades and a pair of first stirring shafts are installed in the tank of the first digestion section. Both of the pair of first stirring shafts are driven by the first driving device and the rotation directions of the two are opposite.

Preferably, a pair of second stirring shafts with stirring blades and a pair of second stirring shafts with stirring blades are installed in the casing of the second digestion section. Both of the pair of second stirring shafts are driven by the second driving device and the rotation directions of the two are opposite.

Preferably, a pair of third agitating shafts with stirring blades and a pair of third agitating shafts are installed in the casing of the third digestion section. Both of the pair of third agitating shafts are driven by a third driving device and the rotation directions of the two are opposite.

As preferably, one of the second stirring shafts and one of them is directly below the first stirring shafts and one of them, and their two directions of rotation are opposite, and one of the third stirring shafts is positioned at one of the second stirring shafts. directly below, and they both rotate in opposite directions.

As preferably, the input end of the water spray device is externally connected to the initial water supply pipeline, and the output end is connected with a plurality of retractable sprinkler heads located on the upper part of the first digestion section box interior space through an automatic flowmeter water valve; preferably, the automatic The water valve of the flow meter is electrically connected with the master control room so as to automatically control the water volume and has the function of cutting off; it is further preferred that multiple retractable sprinklers are adjusted according to the length of the digestion section box, and the lengths are staggered.

Preferably, the initial water supply pipe of the sprinkler is connected to the hot water outlet of an external heat exchanger having a cold water inlet and a hot water outlet as well as a hot heating gas inlet and an exchanged cooling gas outlet.

Compared with the prior art, the utility model has the following beneficial technical effects:

1. Compared with single-stage digestion, the digestion rate increases by 1 to 2 times, and the degree of digestion is high. The scientific digestion process parameters maximize the complete digestion of quicklime. During digestion, less heat is lost, ie the temperature drop is lower. The dust in the exhaust gas is significantly reduced, reducing the burden of subsequent dust removal. Stirring power is shared by multiple stirring shafts to reduce the wear of driving equipment.

2. There are continuous conveying screw blades in the box body of the sealed conveying section, and a spiral seal is formed between the inner wall of the sealed conveying section box and the continuous conveying spiral blades, and only quicklime is allowed to advance into the digesting section box, which can Effectively prevent the steam from flowing back to the material inlet to cause compaction or affect the weighing accuracy of the belt scale.

3. Double-shaft stirring is adopted, which has multiple functions and functions such as stirring, crushing agglomeration and self-cleaning; the stirring frequency of quicklime is increased to make quicklime and water mix evenly and react fully; the stirring blade is made of manganese steel plate welded hard alloy cutter head ,Extended service life.

4. Due to the adoption of multi-stage digestion and the automatic control of water volume, the digestion effect is very good, and the dust generated is also greatly reduced, which greatly improves the external environment of the digestion site. The dust concentration in the digestion area is far lower than the national discharge concentration Standards, control the environmental pollution of the current digestion area.

5. Aiming at the maintenance blind spots below the first-level digestion section of the multi-stage digester, an effective expanded maintenance method is provided, which solves the difficult problem of multi-stage digester maintenance.

The utility model completely solves the problems of low digestion efficiency and poor digestion effect of the existing digester, as well as the pollution of a large amount of dust and smoke.

In addition, the dust collector of the present invention brings the following advantages:

1. The utility model ensures the appropriate immersion depth of the flue gas pipe (for example, 50cm-80cm) by adjusting the water level adjustment equipment, and through the synergistic effect of the nozzle with a mesh structure or porous structure and the water level adjustment equipment, the pressure of the flue gas fluctuates get buffered. The bubbles produced are small and uniform in size. The full contact between the dust-containing flue gas and water is realized, and the dust removal effect is good.

2. Combining the advantages of impact water bath dust removal technology and filter water film dust removal technology, it can capture large particles and fine dust in a targeted manner, and the dust removal efficiency is as high as 99.9%.

3. The water level in the dust collector can be adjusted during the operation of the equipment to achieve high purification efficiency, while ensuring low operating resistance of the purification device and low energy consumption of the equipment.

4. The overflow water seal is used to well control the fluctuation range of the liquid level in the cylinder of the purification device, so as to ensure the stable purification efficiency of the purification device and protect the fan.

5. Dust removal sewage can be recycled after sewage treatment, reducing sewage discharge and preventing secondary pollution.

6. The utility model has the advantages of simple structure, convenient operation and maintenance.

The utility model effectively solves the problem of poor effect of quicklime digestion and dust removal, and solves the environmental pollution problem of existing quicklime digestion of a large amount of dust and flue gas.

Description of drawings

Fig. 1 is the schematic flow chart of quicklime digestion and dedusting system of the present invention.

Fig. 2 is the structural representation of the utility model (upper and lower) two-stage digester.

Fig. 2a is a schematic structural view of the utility model (upper and lower) two-stage digester in which the initial water supply pipe L0 of the water spray device 5 is connected to the hot water outlet of the external heat exchanger X4.

Fig. 3 is a top view structural diagram of the digester shown in Fig. 2 of the present utility model.

Fig. 4 is a schematic left view of the digester shown in Fig. 2 of the present invention.

Fig. 5 is a schematic structural view of the utility model (upper and lower) three-stage digester.

Fig. 6 is a structural schematic diagram of the water-bath deduster of the quicklime digestion and dedusting system of the present invention.

Fig. 7 is a structural schematic diagram of a control system for the water bath dust collector of the present invention.

Fig. 8 is a schematic diagram of a high-efficiency quicklime digestion and dust removal system of the present invention;

Fig. 9 is a schematic diagram of another high-efficiency quicklime digestion and dust removal system of the present invention.

Reference signs:

In Fig. 1, Q-quicklime; A or 1-digester (or digestion device); B or Q1-dust collector (or dust removal device); C-exhauster fan; D-chimney; E-sewage treatment device; E1-stirring Pool; E2-sedimentation tank; E3-clear water tank; E11-mixer; F1-sewage pump; F2-clear water pump; K-cleaning device; J-dust removal at other points; L1-main water pipe; L2-clear water pipe; L0- Initial water supply pipe; H-steelmaking sludge; G-sludge pump.

In Fig. 2-5, 1: quicklime digester; 2-feed inlet; 201-automatic sealing valve; 3-sealed conveying section box; 301-conveying screw blade; 4-first digestion section box; 4a-the second The first bed or the bed in the first digestion section box; 401a and 401b-the first stirring shaft; 402-stirring blade; 5-water spray device; 501-automatic flowmeter water valve; 502-retractable sprinkler head; 6 -sealed dust cover; 601-dust collection external interface; 7-first (upper) digestion box feeding place and opening; 7a-second (middle) digestion box feeding place and opening; 8- The second digestion section box; 8a-the second bed or the bed in the second digestion section box; 801a and 801b-the second stirring shaft; 9-discharge port; 10-digestion box maintenance device; 10a-digestion Box maintenance device door; 10b digestion box maintenance device door movable connection device; 11-first driving device; 11a-first coupling; 11b-first gear box; 11c-first bearing seat; 12-second Driving device; 12a-the second coupling; 12b-the second gear box; 12c-the second bearing seat; 13-the third driving device; 13a-the third coupling; 13b-the third gear box; 13c-the first Three bearing seats; 14-the third digestion section box; 14a-the third bed or the bed in the third digestion section box; 1401a and 1401b-the third stirring shaft (pair); L0-initial water supply pipe; X4- Heat exchange device; X5-cold water; X6-heating gas (such as hot air of ring cooler).

In Figure 6 and Figure 7, Q1: Dust collector; Q2: Dust removal pool; Q201: Water supply pipe; Q202: Water supply pipe valve; Q203: Sewage sludge discharge device; Q204: Water pressure gauge; Q3: Dust collector housing; Q301 : Water level adjustment hole; Q302: Card slot; Q303: Clean air outlet; Q4: Dust removal pipe; Q401: Submerged pipe nozzle; Q5: Overflow water seal pool; Q501: Cover plate; Flow pipe valve; Q6: water level adjustment device; Q601: water level adjustment plate; Q602: screw rod; Q603: regulating valve; Q7: bracket; Q701: first group of wire mesh; Q702: second group of wire mesh; Sealing card; Q8: sprinkler head; Q9: water retaining and defogging plate; Q10: control system.

In Fig. 8 and Fig. 9, A1: ventilation device; A2: chimney; A3: dust removal sewage treatment device; A4: sludge treatment device; A5: cleaning device; A6: slaked lime conveying device; A7: mixer.

detailed description

According to the first embodiment of the present utility model, a two-stage quicklime digester 1 is provided, which includes: a feed port 2, a sealed conveying section box body 3 whose front end communicates with the feed port 2, and a sealed conveying section box body 3 The first digestion section casing 4 connected to the rear end of the first digestion section casing 4, the water spray device 5 on the top or side of the first digestion section casing 4; the sealed dust removal cover 6 on the top of the first digestion section casing 4, located at the first In the first digestion section box 4 and at the end far away from the feed port 2, the upper digestion box feeding place and the feed opening 7 are located at the second digestion section box 8 below the first digestion section box body 4, located at the second In the second digestion section casing 8 and near the discharge port 9 of the end of the feed port 2; wherein: a pair of first stirring shafts 401a and 401b with stirring blades 402 are housed in the first digestion section casing 4, which A pair of first agitating shafts 401a and 401b are both driven by the first driving device 11 and the rotation directions of the two are opposite; in addition, a pair of second agitating shafts with agitating blades are installed in the second digestion section casing 8 801a and 801b, the pair of second agitating shafts 801a and 801b are driven by the second driving device 12 and their rotation directions are opposite;

According to the second embodiment of the utility model, a three-stage quicklime digester 1 is provided, which includes: a feed inlet 2, a sealed delivery section box 3 whose front end communicates with the feed inlet 2, and a sealed delivery section box 3 The first digestion section casing 4 connected to the rear end of the first digestion section casing 4, the water spray device 5 on the top or side of the first digestion section casing 4; the sealed dust removal cover 6 on the top of the first digestion section casing 4, located at the first In the first digestion section box 4 and at the end far away from the feed port 2, the upper digestion box feeding place and the feed opening 7 are located at the second digestion section box 8 below the first digestion section box body 4, located at the second In the second digestion section casing 8 and near the end of the feed port 2, the second digestion casing blanking place and the opening (i.e., the discharge port) 7a, the third digestion section below the second digestion section casing 8 Section box 14, located in the third digestion section box 14 and away from the discharge port 9 at the end of the feed port 2; Stirring shafts 401a and 401b, the pair of first stirring shafts 401a and 401b are both driven by the first driving device 11 and the rotation directions of the two are opposite; The second stirring shafts 801a and 801b of the pair are driven by the second driving device 12 and the rotation directions of the two are opposite; Have the 3rd stirring shaft 1401a and 1401b of stirring blade, the 3rd stirring shaft 1401a of this pair and 1401b both are driven by the 3rd driving device 13 and the direction of rotation of both is opposite; And, sealing dust removal cover 6 has dust collecting External interface 601.

In the above two embodiments, preferably, one 801a of the second stirring shafts 801a and 801b is located directly below one 401a of the first stirring shafts 401a and 401b, and the rotation directions of both of them 401a and 801a are opposite.

Further preferably, one 801a of the second stirring shafts 801a and 801b is located directly below one 401a of the first stirring shafts 401a and 401b, and the directions of rotation of both of them 401a and 801a are opposite, and the third stirring shafts 1401a and 1401b One 1401a of them is located directly below one 801a of the second stirring shafts 801a and 801b, and both of them 401a and 801a rotate in opposite directions.

Preferably, the input end of the water spray device 5 is externally connected to the initial water supply pipeline L0, and the output end is connected to a plurality of retractable sprinkler heads 502 located in the upper part of the first digestion section box 4 through an automatic flowmeter water valve 501; preferably Preferably, the automatic flowmeter water valve 501 is electrically connected to the master control room so as to automatically control the water volume and has a cut-off function; further preferably, a plurality of retractable sprinkler heads 502 are telescopically adjusted according to the length of the digestion section box, and the lengths are staggered. arranged.

In addition, the initial water supply pipe L0 of the sprinkler 5 is connected to the hot water outlet of the external heat exchanger X4. The heat exchanger X4 has a cold water inlet X5 and a hot water outlet as well as a hot heating gas inlet X6 and an exchanged cooling gas outlet, as shown in Figure 2a. Correspondingly, in FIG. 5 , the initial water supply pipe L0 of the water spray device 5 can also be connected to the hot water outlet of the external heat exchanger X4.

Preferably, the height of the sealed dust removal cover 6 provided above the first digestion section box body 4 increases gradually along the material conveying direction of the box body 4, and the dust collection external interface 601 is located at the end of the dust removal cover 6, through which the dust collection external interface 601 is connected with the external dust collector or the pipeline of the dust removal system.

Preferably, on the casing of the two-stage quicklime digester 1 or the three-stage quicklime digester 1, a digester box overhaul device 10 is also provided, and the overhaul device 10 includes one or more digester box overhaul device doors 10a and one or more A digestive box maintenance device door movable connection mechanism 10b; preferably, one or more digestive box maintenance device door movable connection mechanisms 10b are installed on the bottom of the second box body or are installed on the second box body and the first box body at the same time The respective bottoms of the three casings, the bottom of the digestion box maintenance device door 10a are connected with the movable connection mechanism 10b of the digestion box maintenance device door, and the door 10a can rotate around the movable connection mechanism 10b, and the upper part of the digestion box maintenance device door 10a is connected with the movable connection mechanism 10b. The upper part of the lower box is snapped connected, that is, the upper part of the door 10a of the digestion box maintenance device can be opened and closed,

According to the third embodiment of the present utility model, there is provided quicklime digestion and dedusting device, which comprises any one of above-mentioned digester 1 and water bath deduster Q1, and the latter connects with the dust collection external interface of digester 1 through a dedusting pipeline Q4 601 is connected;

Preferably, the above-mentioned water bath dust collector Q1 includes:

Dust removal pool Q2;

The dust collector housing Q3 located above the dust removal pool Q2;

Dust removal pipe Q4,

It is characterized in that one end of the dust removal pipeline Q4 is externally connected to the output end of one or more dust-containing gas collection devices (such as the dust removal interface of the lime digester), and the other end passes through the dust collector housing Q3 from top to bottom and extends into the dust removal In the dust removal pool Q2 below the device housing Q3, one end of the dust removal pipeline Q4 extending into the dust removal pool Q2 is provided with a submerged pipeline nozzle Q401, wherein the end of the submerged pipeline nozzle Q401 has a mesh structure or a porous structure; preferably, The dust removal pipe Q4 passes through the middle of the dust collector housing Q3.

Preferably, the dust remover Q1 also includes: an overflow water seal pool Q5 located on one side of the dust removal pool Q2, and a water level drawn at the lower end of the dust collector housing Q3 side between the dust removal pool Q2 and the overflow water seal pool Q5 Adjustment hole Q301; more preferably, on the outside of the dust collector housing Q3 next to the water level adjustment hole Q301, a card slot Q302 and a water level adjustment device Q6 are provided. The water level adjustment device Q6 includes a water level adjustment plate Q601, screw rod Q602, adjustment The valve Q603 and the water level regulating plate Q601 are stuck in the card slot Q302, one end of the screw rod Q602 is connected to the water level regulating plate Q601, and the other end of the screw rod Q602 is connected to the regulating valve Q603, wherein the vertical direction of the water level regulating plate Q601 The width is slightly larger than the vertical width of the water level adjustment hole Q301.

Preferably, the dust collector Q1 also includes: a cover plate Q501 arranged above the overflow water-sealed pool Q5, one end of the cover plate Q501 is connected to the dust collector housing Q3, and the other end is inserted into the overflow water-sealed pool Q2; more preferably, A through hole is opened on the cover plate Q501, and the screw rod Q602 passes through the through hole. The screw rod Q602 moves up and down along the through hole through the action of the regulating valve Q603, thus driving the water level regulating plate Q601 to move up and down.

Preferably, an overflow pipe Q502 is provided on the upper part of the overflow water-sealed pool Q5 for adjusting the water level in the overflow water-sealed pool; more preferably, an overflow pipe valve Q503 is provided on the overflow pipe Q502.

Preferably, a water replenishment pipe Q201 is provided on the dust removal water pool Q2 for replenishing water in the dust removal water pool; preferably, a water replenishment pipe valve Q202 is provided on the water replenishment water pipe Q201.

Preferably, the bottom of the dust removal pool Q2 is funnel-shaped or "V"-shaped or in the shape of an inverted cone, and the bottom of the dust removal pool Q2 is provided with a sewage sludge discharge device Q203; more preferably, the sewage sludge discharge device Q203 is also provided with Water pressure gauge Q204.

Preferably, a support Q7 is provided above the dust removal pool Q2 in the dust collector housing Q3, and a first group of wire mesh Q701 (preferably a V-shaped filter screen or a V-shaped wire) as a bubble puncture point is provided below the support Q7. net) and a second group of wire mesh Q702 (preferably an inverted V-shaped wire mesh) is arranged above the support Q7; preferably, the first group of wire mesh Q701 and/or the second group of wire mesh Q702 are staggered and inclined Arrangement, the intersection point is provided with a sealing card Q703.

Preferably, a sprinkler head Q8 is arranged above the second group of wire mesh Q702 for spraying dedusting water or dedusting liquid on the second group of wire mesh Q702; The plate Q9 is provided with a clean air outlet Q303 on the dust collector housing above the water retaining and defogging plate Q9.

Preferably, the dust collector Q1 also includes a control system Q10, the water pressure gauge Q204, the overflow pipe valve Q503 and the water supply pipe valve Q202 are connected to the control system Q10, and the control system Q10 controls the water pressure gauge Q204, the overflow pipe valve Q503 and the water supply pipe valve Q202.

According to another aspect of the present invention, there is provided a quicklime digestion and dedusting method using the above-mentioned digestion and dedusting device comprising a two-stage quicklime digester, the method comprising the following steps:

1) Quicklime digestion: Put quicklime into the feed port 2 of the two-stage quicklime digester 1, and transport it to the first digestion section box 4 through the sealed delivery section box 3, and pass through the first digestion section box 4 The water spray device 5 on the upper or side of the first digestion section box 4 sprays water to the quicklime material moving in the first digestion section box 4, so that the quicklime is mixed and digested while moving under the agitation of the stirring shaft, and then enters the second digestion section box In the body 8, further mixing and digestion occur while moving under the stirring effect of the stirring shaft again, and the quicklime after the digestion is discharged through the discharge port 9 at the bottom of the quicklime digester 1; and

2) Dedusting of dust-containing gas: the dust-containing gas in the sealed dust-removing cover 6 is output from the dust-collecting outer interface 601 of the sealed dust-removing cover 6 to the dust-removing pipeline Q4 of the water-bath dust collector Q1, and the dust-containing gas passes through the liquid of the dust-removing pipeline Q4. The nozzle Q401 of the lower pipe is sprayed into the water of the dust removal pool Q2, and the dust is removed by contacting with the water, and the gas after dust removal is discharged from the clean air outlet Q303 provided on the dust collector housing.

According to still another aspect of the present utility model, there is provided a quicklime digestion and dust removal method using the above-mentioned digestion and dust removal device including a three-stage quicklime digester, the method comprising the following steps:

1) Quicklime digestion: Put quicklime into the feed port 2 of the three-stage quicklime digester 1, and then transport it to the first digestion section box 4 through the sealed delivery section box 3, and pass through the first digestion section box 4 The water spray device 5 on the upper or side of the first digestion section box 4 sprays water to the quicklime material moving in the first digestion section box 4, so that the quicklime is mixed and digested while moving under the agitation of the stirring shaft, and then enters the second digestion section box The body 8 is further mixed and digested while moving under the stirring action of the stirring shaft, and then enters the third digestion section box 14 to further mix and digest while moving under the stirring action of the stirring shaft, and the digested The quicklime is discharged through the outlet 9 at the bottom of the quicklime digester 1; and

2) Dedusting of dust-containing gas: the dust-containing gas in the sealed dust-removing cover 6 is output from the dust-collecting outer interface 601 of the sealed dust-removing cover 6 to the dust-removing pipeline Q4 of the water-bath dust collector Q1, and the dust-containing gas passes through the liquid of the dust-removing pipeline Q4. The nozzle Q401 of the lower pipe is sprayed into the water of the dust removal pool Q2, and the dust is removed by contacting with the water, and the gas after dust removal is discharged from the clean air outlet Q303 provided on the dust collector housing.

Referring to accompanying drawings 2 to 5, the three-stage digester in Fig. 5 will be described on the basis of the two-stage digester shown in Fig. 2 to Fig. 4 , and the specific embodiment of the utility model will be described more specifically.

Referring to Fig. 1, the digestion and dedusting system includes, digestion unit A, adopts multi-stage digester 1, quicklime Q and steelmaking sludge H transported by sludge pump G are added to digestion unit A, and then through the initial water supply Pipeline L0 adds water to the digestion unit for digestion. Lime digester dust is mainly caused by adding water during the digestion process to produce a large amount of water vapor and lime dust. To collect these dusts, it is necessary to seal the upper part of the digester and directly connect the dust removal pipe to the exhaust port of the digester that has been sealed through the vacuum hood. The dust collected by the digester is sent to the dust removal device B (ie dust collector Q1) through the dust removal pipeline together with other point dust removal J.

First, with reference to accompanying drawings 2 to 4, the digestion device A of this system is a two-stage digester 1, including upper and lower boxes, and the upper box is divided into a connected first digestion section box 4 and a sealed In the conveying section box 3, two first stirring shafts 401a and 401b driven by a power device are arranged in parallel in the first digestion section box 4, and the two stirring shafts 401a and 401b rotate synchronously and in opposite directions. Including the first driving device 11, the first driving device 11 is connected to the first gear box 11b through the first coupling 11a, and the two stirring shafts 401a and 401b are respectively connected to the first gear box 11b through the first bearing seat 11c. A pair of gears meshing with each other are connected to achieve synchronous reverse rotation. The first bearing seat 11c is located outside the box body 4 and adopts a split design. The bearing has a good working environment and a long service life; two stirring rods 401a and 401b The part that is positioned at the first digesting section casing 4 is provided with some dispersed stirring blades 402, and the stirring blades 402 on the two stirring shafts 401a and 401b are alternately arranged (only one stirring shaft 401 and its Stirring blade 402), two stirring shafts 401a and 401b are positioned at the part in the casing 3 of the sealed conveying section to be provided with the conveying screw blade 301, and the top of the casing 3 of the sealed conveying section is provided with the feed port 2, and the feed port 2 and An automatic sealing valve 201 is provided at the junction of the sealed delivery section box body 3, and the discharge port of the sealed delivery section box body 3 is connected to the head end feed port of the first digestion section box body 4; The discharge port at the tail end is provided with the feeding place of the upper digestion box and the opening 7, and the material enters the head end of the second digestion section box 8 of the lower box through the feeding place of the upper digestion box and the opening 7. Two second agitating shafts 801a and 801b driven by a power device are also arranged in parallel in the second digestion section box 8, and the two agitating shafts 801a and 801b also rotate synchronously and in opposite directions. The power device includes a second driving device 12. The second driving device 12 is connected to the second gear box 12b through the second coupling 12a, and the two stirring shafts 801a and 801b are respectively connected to a pair of intermeshed in the second gear box 12b through the second bearing housing 12c. The gears are connected so as to realize synchronous reverse rotation, and the turning of the second driving device 12 is opposite to that of the first driving device 11; A number of dispersed stirring blades, the stirring blades on the two stirring shafts 801a and 801b are arranged alternately, a discharge port 9 is arranged at the tail end of the second digestion section casing 8, and a discharge port 9 is arranged on the two-stage digester casing. The digestion box maintenance device 10 includes a digestion box maintenance device door 10a and a digestion box maintenance device door movable connection mechanism 10b, the digestion box maintenance device door movable connection mechanism 10b is installed at the bottom of the lower box, and the digestion box maintenance device door 10a The bottom is connected with the movable connection mechanism 10b of the door of the digestion box maintenance device, and the door can rotate around the movable connection mechanism 10b, and the digestion box maintenance device door The upper part of 10a is snap-connected with the upper part of the lower box body, that is, the upper part of the door 10a of the maintenance device of the digestion box can be opened and closed. During maintenance, the door 10a of the maintenance device of the digestion box is opened for maintenance. The maintenance device is unfolded as a whole, which is greatly convenient Digester overhaul. A sealed dust removal cover 6 is also arranged above the first digestion section box body 4. The height of the dust removal cover 6 increases gradually along the direction of material conveyance. There is also a dust collection external interface 601 at the end of the dust removal cover 6, through which the dust collection external interface 601 is connected with external dust removal system pipes. The upper box is also provided with a water spray device 5, one end of the water spray device 5 is externally connected to the initial water supply pipeline L0, and the other end is connected to a plurality of retractable sprinkler heads 502 through an automatic flow meter water valve 501, and the automatic flow meter water valve 501 is connected to The main control room is electrically connected to automatically control the water volume and has the function of cutting off. Several retractable sprinklers 502 extend into the dust cover 6 above the first digestion section box body 4 to spray water on the materials. Several retractable sprinklers 502 can be used according to the digestion The length of the section box is telescopically adjusted, and the length is staggered, so that the water is added more evenly, the water area is wider, and the water volume is automatically controlled.

Referring to FIG. 5 , the digester shown in FIG. 5 is an upper, middle and lower three-stage digester 1 . A third digestion section box 14 is also provided below the second digestion section box body 8 . A pair of third stirring shafts 1401a and 1401b with stirring blades are housed in the third digestion section casing 14, both of the third stirring shafts 1401a and 1401b of this pair are driven by the third driving device 13 and the direction of rotation of the two on the contrary.

The three-stage digestion device has the following advantages: 1. Compared with single-stage digestion, the digestibility is increased by 2 to 3 times, the degree of digestion is high, and the scientific digestion process parameters maximize the complete digestion of quicklime. 2. There are continuous conveying screw blades in the box body of the sealed conveying section, and a spiral seal is formed between the inner wall of the sealed conveying section box and the continuous conveying spiral blades, and only quicklime is allowed to advance into the digesting section box, which can Effectively prevent the steam from flowing back to the material inlet to cause compaction or affect the weighing accuracy of the belt scale. 3. Double-shaft stirring is adopted, which has multiple functions and functions such as stirring, crushing agglomeration and self-cleaning; the stirring frequency of quicklime is increased to make quicklime and water mix evenly and react fully; the stirring blade is made of manganese steel plate welded hard alloy cutter head ,Extended service life. 4. Due to the adoption of multi-stage digestion and the automatic control of water volume, the digestion effect is very good, and the dust generated is also greatly reduced, which greatly improves the external environment of the digestion site. The dust concentration in the digestion area is far lower than the national discharge concentration Standards, control the environmental pollution of the current digestion area. 5. Aiming at the maintenance blind spots below the first-level digestion section of the multi-stage digester, an effective expanded maintenance method is provided, which solves the difficult problem of multi-stage digester maintenance.

The characteristics of quicklime digestion flue gas: 1. Strong cohesiveness and hydrophilicity. According to the test, the breaking strength of CaO is greater than 600Pa. On the inner wall of its pipeline; 2. High dispersion, the chemical reaction between quicklime and water is a violent exothermic reaction, and the particle size of the Ca(OH) ₂ colloidal particles generated is extremely fine, with an average particle size of 30 μm. Therefore, in the digestion process Medium quicklime dust is easy to diffuse with the hot air flow, and the natural settlement is very slow, the diffusion range is wide, and the dust collection is difficult; 3. Hydraulicity, quicklime is digested with water to form Ca(OH) ₂ , which will further absorb water when dispersed in the air It reacts with CO ₂ to form CaCO ₃ precipitates. When the amount of CaCO ₃ accumulates to a certain extent, it will form hard scale and compact. The characteristics of quicklime digestion flue gas will not only cause quicklime to adhere to the dust removal pipe, block the pipe after hardening, but also seriously corrode the electrode plate of the electrostatic precipitator, affecting its normal operation. When the bag filter is used, it will also be forced to stop using the bag due to the water hardness that will quickly cause the bag to become clogged.

Referring to Figure 1, in view of the characteristics of quicklime digestion flue gas, the dedusting device B (i.e. Q1) of this system adopts the water bath dedusting method. The dust removal efficiency is very high.

As shown in Figure 2 and Figure 6, firstly, the digested dusty flue gas (via the dust removal pipeline Q4 shown in Figure 6) is connected to the high-efficiency quicklime digestion water bath from the dust removal interface 601 of the quicklime digester 1 (i.e. A) through the dust removal pipeline Precipitator B, which is Q1 shown in Figure 6. This high-efficiency quicklime digestion water bath dust collector Q1 includes one end connected to the dust removal interface 601 of the lime digester, and the other end connected to the dust removal pipeline Q4 inside the dust collector Q1. The dust removal pipeline Q4 passes through the dust collector shell Q3 and enters the dust collector Q1. The dust removal pipeline Q4 One end protruding into the dust collector Q1 is provided with a submerged pipeline nozzle Q401, the nozzle Q401 has a mesh structure or a porous structure, and the nozzle extends into a certain position (such as a depth of 20-80cm) in the dust removal pool Q2 in the housing Q3. The purpose of the pipeline nozzle Q401d is to cut air bubbles, increase the contact between flue gas and water, and improve the dust removal efficiency; there is a water level adjustment hole Q301 at the lower end of the shell Q3 on the side of the dust removal pool Q2, and a card is set on the outside of the shell beside the opening Q301. Put the slot Q302, the water level adjustment plate Q601 is stuck in the card slot Q302, and cover the water level adjustment hole Q301, the adjustment plate Q601 can adjust the area and height of the water level adjustment hole Q301 by moving up and down. An overflow water seal pool Q5 is arranged on the outside of the plate Q601, and an overflow pipe Q502 is arranged on the upper part of the overflow water seal pool Q5 to adjust the water level in the overflow water seal pool Q5; a water inlet pipe is arranged on the upper part of the other side of the dust removal pool Q2 Q201 and water inlet valve Q202 are used to supplement the water in the dust removal pool. A sealing cover Q501 is arranged above the overflow water sealing pool Q5. The sealing cover Q501 covers part or all of the overflow water sealing pool Q5 to ensure the water level and The airflow is stable, and a sewage sludge discharge device Q203 is installed at the funnel-shaped bottom of the dust removal pool Q2. When the equipment is shut down to clean up, the mud cleaning hole Q204 is opened to discharge the muddy sewage; a bracket Q7 is installed above the dust removal pool Q2 in the shell Q3. A group of wire mesh Q701 (preferably a V-shaped filter screen) as the bubble puncture point is arranged below the support Q7, and a wire mesh Q702 (preferably an inverted V-shaped wire mesh) is arranged above the support Q7. The nets (Q701 and Q702) are arranged in a staggered and inclined manner, and the intersection point is provided with a sealing card Q703, and a spray head Q8 is provided above the wire mesh Q702, which is used to spray dust removal liquid on the wire mesh Q702, forming a filter on the filter mesh Q701 and Q702. The water film flowing downwards, the upper and lower sets of V-shaped nets (Q701 and Q702) form two filter water films to fully capture dust; above the sprinkler head Q8, a water retaining and defogging plate Q9 is installed, and on the top of the water retaining and defogging plate Q9 A clean air outlet Q303 is provided above.

The dust flue gas from the dust removal port of the quicklime digester enters the dust collector through the dust removal pipe. The dust removal pipe is inserted into a certain position in the dust removal pool. The position is determined by the amount of flue gas. The end of the dust removal pipe inserted into the water is equipped with a mesh structure The dust-laden gas with a certain speed is sprayed out at a relatively high speed through the dust removal pipe at a high speed, impacts the water layer and then enters the water, the direction of movement of the gas changes, while the dust particles continue to press due to inertia. The movement in the original direction, most of the dust particles adhere to the water and stay in the water, the air bubbles generated by the flue gas hitting the water body are cut into small air bubbles by the network structure of the nozzle, which increases the contact area between the air bubbles and water, and strengthens the impact of the dust removal water on the air. The dust capture realizes the first-stage impact water bath dedusting; after the water bath dedusting, most of the dust in the flue gas is removed, and the remaining part of the fine particle dust passes through two layers of V-shaped nets, and the water film formed in the nets is fine for the fine particles in the flue gas. The dust is captured to realize the second-stage filter water film dust removal, and the purified gas is discharged from the outlet after being treated by water blocking and demisting.

Compared with the traditional wet dust collector, it has the following advantages: 1. Combining the advantages of impact water bath dust removal technology and filter water film dust removal technology, it can capture large particles and fine dust in a targeted manner, and the dust removal efficiency is as high as 99.9%. 2. The water level in the dust collector can be adjusted during the operation of the equipment to achieve high purification efficiency, while ensuring low operating resistance of the purification device and low energy consumption of the equipment. 3. The overflow water seal is used to well control the fluctuation range of the liquid level in the cylinder of the purification device, to ensure the stable purification efficiency of the purification device, and to protect the fan. 4. Dust removal sewage can be recycled after sewage treatment, reducing sewage discharge and preventing secondary pollution. 5. The utility model has the advantages of simple structure, convenient operation and maintenance.

Referring to Figure 1, the purified gas processed by the dust removal device Q1 (or B) is connected to the exhaust fan C through the ventilation duct, and the exhaust fan C is connected to the chimney D. The exhaust fan discharges the dust-removed flue gas through the chimney into the atmosphere. A simple re-dusting device and a moisture collection device are also installed in the chimney to achieve the dust content of the exhausted air reaching the national standard and the collection, recycling and reuse of moisture.

The sewage treated by the dedusting device Q1 (i.e. B) in the water bath dedusting is introduced into the sewage treatment device E through the sewage pipeline. The sewage treatment device includes a stirring tank E1, a sedimentation tank E2 and a clear water tank E3, and a mixer E11 is installed in the mixing tank. The sewage flows through the stirring tank to the sedimentation tank, and then to the clean water tank. The water in the stirring tank enters the lime digestion unit through the sewage pump F1 for recycling. And the water in the clean water tank is transported to the cleaning device K through the clean water pipeline L2 by the clean water pump F2, and the cleaning device cleans the dust removal pipeline in the whole system, and imports the cleaned sewage into the sewage tank for recycling. Under normal circumstances, the water consumption of the dust collector and fan will be less than the digestion water consumption of the lime digester, and the system must be supplemented with water through the main water inlet pipe L1. The main water inlet pipe L1 is connected to the external water source. The water volume is controlled by a float valve to maintain the dynamic balance of the water volume in the system.

In order to make reasonable use of the water supply, clean water is used for the equipment, which is mainly used for water bath dedusting, cleaning of fans and some dedusting pipes, and replenishment of water, etc. The used sewage is directly discharged to the mixing tank through the drainage ditch. Clean water is used for pipeline cleaning, and the water in the clean water pool is pumped into the pipeline to clean the pipeline. Most of the cleaned sewage flows into the water bath dust collector through the pipeline and enters the mixing tank together with the dust removal wastewater for recycling; the whereabouts of the dust removal wastewater It is pumped into the lime digester or other water consumption points after being stirred by the mixer in the mixing pool.

Referring to Figure 1, after long-term operation of the stirring tank and the sedimentation tank, sludge will accumulate at the bottom, and the sludge will be discharged into the filter press device M from the pipeline at the bottom of the tank. After the sludge is pressed and filtered by the filter press device, the dehydrated sewage The mud is passed into the quicklime digestion unit A, and the filtered water is discharged into the stirring tank again, so as to realize the recycling of sludge and sewage.

Cleaning of pipelines and equipment: The main components of lime digester dust are CaO, Ca(OH) ₂ and water vapor. This kind of dust has strong cohesiveness in high temperature and humid environment. When the dusty gas passes through the dust removal pipeline, it will It will stick to the inner wall of the pipeline and gradually thicken until it is blocked. Under normal circumstances, the dust removal pipeline can remain unblocked for less than a month. In order to prevent the dust removal pipeline from being blocked, it is necessary to clean the pipeline in time, and a cleaning device is designed on the pipeline. In order to prevent pipeline blockage, the dust removal pipeline design should minimize the horizontal pipeline and shorten the pipeline distance, and consider the installation location and maintenance platform of the cleaning device. The gas purified by the water-bath dust collector still contains a small amount of lime dust and a large amount of water vapor. The humid gas is very easy to cause dust accumulation and scaling on the fan blades. When the dust accumulation on the blades reaches a certain thickness, it will partially fall off, resulting in damage to the balance of the impeller. The fan vibrates. In order to solve the above-mentioned frequent problems, dust cleaning holes are set on the fan casing to regularly clean the dust accumulated on the fan impeller; balance.

The dedusting method of water bath deduster, the method comprises the following steps:

(1) Store water in the dedusting pool through the water supply pipe Q201, adjust the water level regulating plate Q601, make the water level in the dedusting pool Q2 reach a predetermined value, and close the water supply pipe valve Q202;

(2) Dusty gas (such as dust and flue gas from the dust removal port of the quicklime digester) enters the dust collector Q1 from the middle of the dust collector housing Q3 through the dust removal pipe Q4 from top to bottom. The flow rate is adjusted by adjusting the water level adjustment device Q6 so that the dust removal pipe Q4 is inserted into a certain position in the dust removal pool Q2, and the end of the dust removal pipe Q4 inserted into the water is provided with a network structure underwater pipe nozzle Q401;

(3) The dust-laden gas with a certain speed flows through the dust removal pipeline Q4 and is ejected at a relatively high speed at the nozzle Q401 of the submerged pipeline. After impacting the water layer, it enters the water, the direction of movement of the gas changes, and the dust particles due to inertia The effect will continue to move in the original direction, and most of the dust particles will remain in the water after adhering to the water. The flue gas hits the water body and is cut into small bubbles by the network structure of the nozzle Q401 of the submerged pipeline, which increases the contact area between the flue gas and water. , strengthen the capture of dust by dust removal water, and realize the first-level impact water bath dust removal;

(4) After water bath dedusting, most of the dust in the flue gas is removed, and the remaining part of the fine particle dust passes through the first set of wire mesh Q701 to form the first water film and the second set of wire mesh Q702 to form the second water film , Two water films capture the fine dust in the flue gas, realizing the second-stage filter water film dedusting, the purified gas is discharged from the outlet after being treated by the water retaining and defogging plate Q9.

(5) Dust removal pool Q2 has been turned into sewage after long-term dust removal, and the sewage is discharged from the sewage sludge discharge device Q203 at the bottom of the funnel-shaped or "V"-shaped dust removal pool Q2, and water is replenished from the water supply pipe Q201.

A high-efficiency quicklime digestion and dust removal system, which includes a digester 1, a water bath dust collector Q1, and also includes an exhaust device A1, a chimney A2, a dust removal sewage treatment device A3, a sludge treatment device A4, a cleaning device A5, and a slaked lime delivery device A6 and The mixer A7 and the water bath dust collector Q1 are connected to the dust collection external interface 601 of the digester 1 through a dust removal pipe Q4; The conveying device A6 is connected, the clean air outlet Q303 of the water bath dust collector Q1 is connected with the chimney A2 through the exhaust device A1, the overflow pipe Q502 of the water bath dust collector Q1 is connected with the dust removal sewage treatment device A3, and the sewage sludge discharge device at the bottom of the dust removal pool Q2 Q203 is connected to the sludge treatment device A4, the dust removal sewage treatment device A3 is connected to the cleaning device A5, and optionally, the dust removal sewage treatment device A3 is connected to the sludge treatment device A4.

Preferably, the sludge treatment device A4 includes a filter press water outlet and a filter press sludge outlet, the filter press water outlet is connected to the cleaning device A5 , and the filter press sludge outlet is connected to the digester 1 .

The using method of three-stage quicklime digester, this method comprises the following steps:

(1) quicklime digestion: put quicklime into the feed port 2 of the three-stage quicklime digester 1, and be transported to the first digestion section box 4 through the sealed delivery section box 3;

(2) Spray water to the quicklime material moving in the first digestion section box 4 through the water spray device 5 located on the top or side of the first digestion section box 4, so that the quicklime moves while being stirred by the stirring shaft. Mixing and digestion take place;

(3) After entering the second digestion section casing 8, further mixing and digestion occur while moving under the agitation of the stirring shaft;

(4) After entering the third digestion section box 14, further mixing and digestion occur while moving under the stirring action of the stirring shaft, and the digested quicklime is discharged through the outlet 9 at the bottom of the quicklime digester 1 .

As preferably, a pair of first stirring shafts 401a and 401b with stirring blades 402 are installed in the first digestion section casing 4, both of the pair of first stirring shafts 401a and 401b are driven by the first drive device 11 and both The direction of rotation is opposite.

As preferably, a pair of second stirring shafts 801a and 801b with stirring blades are installed in the second digestion section casing 8, both of the pair of second stirring shafts 801a and 801b are driven by the second drive device 12 and both The direction of rotation is opposite.

As preferably, a pair of third stirring shafts 1401a and 1401b with stirring blades are installed in the third digestion section casing 14, both of the pair of third stirring shafts 1401a and 1401b are driven by the third driving device 13 and both The direction of rotation is opposite.

Preferably, one 801a of the second stirring shafts 801a and 801b is located directly below one 401a of the first stirring shafts 401a and 401b, and the rotation directions of both of them 401a and 801a are opposite, and the third stirring shafts 1401a and 1401b One 1401a of them is located directly below one 801a of the second stirring shafts 801a and 801b, and both of them 401a and 801a rotate in opposite directions.

As a preference, the input end of the water spray device 5 is externally connected to the initial water supply pipeline L0, and the output end is connected to a plurality of retractable sprinkler heads 502 located on the upper part of the inner space of the first digestion section casing 4 through an automatic flowmeter water valve 501; Preferably, the automatic flow meter water valve 501 is electrically connected to the master control room so as to automatically control the water volume and has a cut-off function; Staggered arrangement.

Preferably, the initial water supply pipe L0 of the sprinkler 5 is connected to the hot water outlet of the external heat exchanger X4, which has a cold water inlet X5 and a hot water outlet and a hot heating gas inlet X6 and a heat-exchanged Cooling gas outlet.

Example 1

In this embodiment, a digestion and dedusting plant comprising a three-stage quicklime digester 1 and a deduster Q1 is used, wherein each rotation axis of the second stage rotates in the same direction as the corresponding rotation axis directly above, and the third stage Each axis of rotation of a stage rotates in the same direction as the corresponding axis of rotation of the second stage directly above. The theoretical amount of water required for quicklime digestion is 32 wt% of the quicklime weight. In this embodiment, the rate of water spraying ensures that the amount of water sprayed accounts for 70wt% of the weight of quicklime.

Quicklime digestion and dedusting method, the method comprises the following steps:

1) Quicklime digestion: Put quicklime into the feed port 2 of the three-stage quicklime digester 1, and then transport it to the first digestion section box 4 through the sealed delivery section box 3, and pass through the first digestion section box 4 The water spray device 5 on the upper or side of the first digestion section box 4 sprays water to the quicklime material moving in the first digestion section box 4, so that the quicklime is mixed and digested while moving under the agitation of the stirring shaft, and then enters the second digestion section box The body 8 is further mixed and digested while moving under the stirring action of the stirring shaft, and then enters the third digestion section box 14 to further mix and digest while moving under the stirring action of the stirring shaft, and the digested The quicklime is discharged through the outlet 9 at the bottom of the quicklime digester 1; and

2) Dedusting of dust-containing gas: the dust-containing gas in the sealed dust-removing cover 6 is output from the dust-collecting outer interface 601 of the sealed dust-removing cover 6 to the dust-removing pipeline Q4 of the water-bath dust collector Q1, and the dust-containing gas passes through the liquid of the dust-removing pipeline Q4. The nozzle Q401 of the lower pipe is sprayed into the water of the dust removal pool Q2, and the dust is removed by contacting with the water, and the gas after dust removal is discharged from the clean air outlet Q303 provided on the dust collector housing.

After 10 days of continuous operation, no blockage occurred at the discharge port.

The dust removal effect of dust collector Q1 is higher than 99.6%.

During normal operation, samples are taken from the outlet 9 at the bottom of the quicklime digester 1 at the same 20 second intervals for analysis.

Example 2

Example 1 is repeated, using a digestion and dedusting plant comprising a two-stage quicklime digester 1, except that each axis of rotation of the second stage rotates in the opposite direction to the corresponding axis of rotation directly above, while each axis of rotation of the third stage The shaft rotates in the opposite direction to the corresponding secondary rotation shaft directly above.

After 10 days of continuous operation, no blockage occurred at the discharge port.

The dust removal effect of dust collector Q1 is higher than 99.7%.

During normal operation, samples are taken from the outlet 9 at the bottom of the quicklime digester 1 at the same 20 second intervals for analysis.

Comparative example 1

In the sintering plant of a steel company in Hunan Province, a single-stage digester is used for digestion. During normal operation, samples are taken from the discharge port of the quicklime digester at the same 20-second interval for analysis. The discharge port is blocked, and it needs to be cleaned regularly (about 3 days).

Example 3

A high-efficiency quicklime digestion and dust removal system, which includes a digester 1, a water bath dust collector Q1, and also includes an exhaust device A1, a chimney A2, a dust removal sewage treatment device A3, a sludge treatment device A4, a cleaning device A5, and a slaked lime delivery device A6 and The mixer A7 and the water bath dust collector Q1 are connected to the dust collection external interface 601 of the digester 1 through a dust removal pipe Q4; The conveying device A6 is connected, the clean air outlet Q303 of the water bath dust collector Q1 is connected with the chimney A2 through the exhaust device A1, the overflow pipe Q502 of the water bath dust collector Q1 is connected with the dust removal sewage treatment device A3, and the sewage sludge discharge device at the bottom of the dust removal pool Q2 Q203 is connected to the sludge treatment device A4, the dust removal sewage treatment device A3 is connected to the cleaning device A5, and optionally, the dust removal sewage treatment device A3 is connected to the sludge treatment device A4.

Example 4

Repeat Example 3, except that the sludge treatment device A4 includes a filter press water outlet and a filter press sludge outlet, the filter press water outlet is connected to the cleaning device A5, and the filter press sludge outlet is connected to the digester 1.

test results:

For sample adopt Malvern (Malvern) particle size analyzer to measure the particle size distribution index I of the slaked lime that obtains after digestion, the result is as follows:

Particle size distribution index I=(d ₉₀ −d ₁₀ )/2d ₅₀ .

From the above results, it can be seen that the smaller the value of the particle size distribution index I, the more uniform the particle size. In addition, the range of variation in the value of the particle size distribution index I in Example 2 is the smallest, indicating that the digestion in the entire digestion process is very uniform.

The utility model can completely solve a series of problems such as the low digestion efficiency of the existing digester, the low efficiency of the dust collector, the blockage of the dust removal pipeline, the vibration of the fan, and the recycling of sewage sludge, so as to ensure the long-term stable operation of the dust removal system. The digestibility of quicklime is very high, and the collection effect of dust and water vapor will reach more than 99%. The emission concentration of flue gas and dust after purification is far lower than the emission standard stipulated by the state, and the purpose of energy saving and environmental protection is also achieved.

Claims (37)

1. burnt lime digester (1), it includes：Charging aperture (2), the sealing transportation section casing that front end is connected with charging aperture (2) (3) the first digestion section casing (4), being connected with the rear end of sealing transportation section casing (3), positioned at the first digestion section casing (4) Top or sidepiece water injector (5)；The sealing dust excluding hood (6) being located at the top of the first digestion section casing (4), disappears positioned at first Change in section casing (4) and away from the upper digestion casing blanking of that one end of charging aperture (2) and material mouth (7) is disclosed, disappear positioned at first Change the second digestion section casing (8) below section casing (4), in the second digestion section casing (8) and near charging aperture (2) that The second of one end digests at casing blanking and discloses material mouth (7a), the 3rd digestion section case below the second digestion section casing (8) Body (14), the discharging opening (9) of that one end in the 3rd digestion section casing (14) and away from charging aperture (2)；Wherein：First Digestion section casing (4) built with a pair of the first shaft (401a, 401b) with stirring vane (402), this pair the Both are driven by first driving means (11) and both direction of rotation is contrary for one shaft (401a, 401b)；? Two digestion section casing (8) second are stirred for this pair built with a pair of the second shaft (801a, 801b) with stirring vane Both are driven by the second driving means (12) and both direction of rotation is contrary to mix axle (801a, 801b)；Disappear the 3rd Change section casing (14) built with a pair of the 3rd shaft (1401a, 1401b) with stirring vane, the 3rd stir for this pair Both are driven by the 3rd driving means (13) and both direction of rotation is contrary to mix axle (1401a, 1401b)；With sealing Dust excluding hood (6) has the external tapping (601) that gathers dust；Wherein：The length of three-level digester is 3-30m.

2. according to claim 1 to burnt lime digester (1), wherein, the length of three-level digester is 4-20m.

3. according to claim 1 to burnt lime digester (1), wherein, in the middle of the second shaft (801a, 801b) (801a) be located at the first shaft (401a, 401b) in the middle of one (401a) underface, and their (401a) and (801a) both direction of rotation are conversely, stir positioned at second with (1401a) in the middle of the 3rd shaft (1401a, 1401b) Mix the underface of (801a) in the middle of axle (801a, 801b), and their (401a) and (801a) both direction of rotation On the contrary.

4. burnt lime digester (1) according to any one of claim 1-3, wherein, the input of water injector (5) with Initial water supply line (L0) is external, and output end is by automating flowmeter water valve (501) and being located in the first digestion section casing (4) Multiple telescopic sprinkler head (502) connection on the top in portion space；And/or

Above the first digestion section casing (4), the height of set sealing dust excluding hood (6) is along the material conveying side of the casing (4) To gradually increasing, the external tapping that gathers dust (601) is located at the end of dust excluding hood 6, by the external tapping that gathers dust (601) and extraneous dedusting The pipeline of device or dust pelletizing system is connected.

5. according to claim 4 to burnt lime digester (1), wherein, automation flowmeter water valve (501) is electric with Master Control Room Connection to carry out Automated condtrol and to there is cutting function to the water yield.

6. according to claim 5 to burnt lime digester (1), wherein, multiple scalable sprinkler head (502) are according to digestion section The length of casing carries out flexible adjustment, length arrangement straggly.

7. at the beginning of burnt lime digester (1) according to any one of claim 1-3 or 5-6, wherein water injector (5) The hot water outlet of the externally connected heat exchanger (X4) of beginning water supply line (L0), the heat exchanger (X4) have cooling water inlet (X5) and Cooling gas outlet after the hot gas import (X6) of hot water outlet and heat and heat exchange.

8. according to claim 4 to burnt lime digester (1), the initial water supply line (L0) of wherein water injector (5) connects It is connected to the hot water outlet of the heat exchanger (X4) of outside, the heat exchanger (X4) has cooling water inlet (X5) and hot water outlet and heat Cooling gas outlet after hot gas import (X6) and heat exchange.

9. burnt lime digester (1) according to any one of claim 1-3,5-6 or 8, wherein, in three-level quick lime Digestion casing apparatus for examination and repair (10) is additionally provided with the casing of digester (1), and the apparatus for examination and repair (10) includes one or more digestion Casing apparatus for examination and repair door (10a) and one or more digestion casing apparatus for examination and repair door activities connect mechanism (10b).

10. according to claim 4 to burnt lime digester (1), wherein, on the casing of three-level burnt lime digester (1) Digestion casing apparatus for examination and repair (10) is additionally provided with, the apparatus for examination and repair (10) includes one or more digestion casing apparatus for examination and repair doors (10a) with one or more digestion casing apparatus for examination and repair doors activity even mechanism (10b).

11. burnt lime digester (1) according to claim 9, wherein, one or more digestion casing apparatus for examination and repair doors are lived Dynamic bindiny mechanism 10b is installed in the bottom of the second casing or while is installed in the second casing and the respective bottom of the 3rd casing Portion, the bottom for digesting casing apparatus for examination and repair door (10a) are connected with digestion casing apparatus for examination and repair door moving connecting mechanism (10b), door (10a) can rotate around the moving connecting mechanism (10b), digest top and the lower box top card of casing apparatus for examination and repair door (10a) Button connection, i.e., digestion casing apparatus for examination and repair door (10a) top can be opened and be closed.

12. quicklime slakings and dust arrester, it include the digester (1) according to any one of claim 1-11 and Wet dust collector (Q1), the latter are connected with the external tapping that gathers dust (601) of digester (1) by a cleaning shaft (Q4)；

Wherein wet dust collector (Q1) includes：

Dedusting pond (Q2)；

The shell of dust remover (Q3) being located above dedusting pond (Q2)；

Cleaning shaft (Q4),

It is characterized in that：One end of cleaning shaft (Q4) is external to one or more output ends containing dusty gas collection device, The other end through shell of dust remover (Q3) and is stretched in the dedusting pond (Q2) below shell of dust remover (Q3), dedusting from top to bottom Pipeline (Q4) stretches into the one end in dedusting pond (Q2) and is provided with liquid down tube channel showerhead (Q401), wherein liquid down tube channel showerhead (Q401) end is network structure or loose structure.

13. quicklime slakings according to claim 12 and dust arrester, it is characterised in that：Cleaning shaft (Q4) is from dedusting The middle part of device housing (Q3) passes through.

14. quicklime slakings according to claim 12 or 13 and dust arrester, it is characterised in that：The deduster (Q1) is also Including：The overflow water seal water pond (Q5) of dedusting pond (Q2) side is located at, and in dedusting pond (Q2) and overflow water seal water pond (Q5) between, in the water level regulation hole (Q301) issued by the lower end of shell of dust remover (Q3) side.

15. quicklime slakings according to claim 14 and dust arrester, it is characterised in that：At water level regulation hole (Q301) Card being provided with the outside of other shell of dust remover (Q3) and putting groove (Q302) and water level control apparatus (Q6), the water level control apparatus (Q6) are wrapped Water level regulation plate (Q601), screw rod (Q602), regulating valve (Q603) is included, water level regulation plate (Q601) card is placed on the card and puts groove (Q302) in, one end of screw rod (Q602) is connected with water level regulation plate (Q601), the other end of screw rod (Q602) and regulation Valve (Q603) connects, wherein vertical width of the vertical width of water level regulation plate (Q601) slightly larger than water level regulation hole (Q301).

16. quicklime slakings according to claim 14 and dust arrester, it is characterised in that the deduster (Q1) is also wrapped Include：The cover plate (Q501) being arranged on above overflow water seal water pond (Q5), one end of cover plate (Q501) is with shell of dust remover (Q3) even Connect, in other end insertion overflow water seal water pond (Q2).

17. quicklime slakings according to claim 15 and dust arrester, it is characterised in that the deduster (Q1) is also wrapped Include：The cover plate (Q501) being arranged on above overflow water seal water pond (Q5), one end of cover plate (Q501) is with shell of dust remover (Q3) even Connect, in other end insertion overflow water seal water pond (Q2).

18. quicklime slakings according to claim 16 or 17 and dust arrester, it is characterised in that：Open on cover plate (Q501) There are a through hole, screw rod (Q602) to pass through the through hole.

19. quicklime slakings according to claim 14 and dust arrester, it is characterised in that：On overflow water seal water pond (Q5) Portion is provided with overflow pipe (Q502), for adjusting the water level in overflow water seal water pond.

20. quicklime slakings according to any one of claim 15-17 and dust arrester, it is characterised in that：Overflow water Water shutoff pond (Q5) top is provided with overflow pipe (Q502), for adjusting the water level in overflow water seal water pond.

21. quicklime slakings according to claim 19 and dust arrester, it is characterised in that：Overflow pipe (Q502) is provided with Overflow pipe valve (Q503).

22. quicklime slakings according to claim 20 and dust arrester, it is characterised in that：Overflow pipe (Q502) is provided with Overflow pipe valve (Q503).

23. quicklime slakings according to any one of claim 12,13,15-17,19,21 or 22 and dust arrester, its It is characterised by：Be provided with filling pipe (Q201) on dedusting pond (Q2), for in dedusting pond supplement water.

24. quicklime slakings according to claim 14 and dust arrester, it is characterised in that：Set on dedusting pond (Q2) Be equipped with filling pipe (Q201), for in dedusting pond supplement water；Moisturizing water pipe (Q201) is provided with moisturizing pipe valve (Q202).

25. quicklime slakings according to claim 23 and dust arrester, it is characterised in that：Set on moisturizing water pipe (Q201) There is moisturizing pipe valve (Q202).

26. quicklime slakings according to any one of claim 12,13,15-17,19,21,22,24 or 25 and dedusting Device, it is characterised in that：Dedusting pond (Q2) bottom is funnel-form or " V " type or is rendered as inversed-cone shape；Dedusting pond (Q2) bottom is provided with sewage sludge tapping equipment (Q203).

27. quicklime slakings according to claim 14 and dust arrester, it is characterised in that：Dedusting pond (Q2) bottom is Funnel-form or " V " type are rendered as inversed-cone shape；Dedusting pond (Q2) bottom is provided with sewage sludge tapping equipment (Q203)；? Hydraulic gage (Q204) is additionally provided with sewage sludge tapping equipment (Q203).

28. quicklime slakings according to claim 26 and dust arrester, it is characterised in that：In sewage sludge tapping equipment (Q203) hydraulic gage (Q204) is additionally provided with.

29. quick limes according to any one of claim 12,13,15-17,19,21,22,24,25,27 or 28 disappear Change and dust arrester, wherein above the dedusting pond (Q2) in shell of dust remover (Q3), be provided with support (Q7), in support (Q7) be provided with below first group of woven wire (Q701) a little is punctured as bubble and be provided with second above support (Q7) Group woven wire (Q702).

30. quicklime slakings according to claim 14 and dust arrester, the dedusting wherein in the shell of dust remover (Q3) Support (Q7) is provided with above pond (Q2), is provided with and punctures first group of woven wire a little as bubble below support (Q7) (Q701) and second group of woven wire (Q702) is provided with above support (Q7).

31. quicklime slakings according to claim 29 and dust arrester, wherein first group woven wire (Q701) are V-type Screen pack or V-type woven wire, second group of woven wire (Q702) are reverse V-shaped woven wire；First group of woven wire (Q701) And/or second group of woven wire (Q702) alternating inclinations arrangement, point of intersection is provided with to seal blocks (Q703).

32. quicklime slakings according to claim 29 and dust arrester, wherein on second group of woven wire (Q702) Side is provided with sprinkler head (Q8), for above spraying water in dust removal or dedusting liquid to second group of woven wire (Q702).

33. quicklime slakings according to claim 30 or 31 and dust arrester, wherein in second group of woven wire (Q702) sprinkler head (Q8) is provided with above, for above spraying water in dust removal or dedusting liquid to second group of woven wire (Q702)；? Dash demisting plate (Q9) is provided with above sprinkler head (Q8), is being provided with headroom above dash demisting plate (Q9) on shell of dust remover Gas exports (Q303).

34. quicklime slakings according to claim 32 and dust arrester, wherein, are provided with gear above sprinkler head (Q8) Water demisting plate (Q9), is provided with net air outlet (Q303) on shell of dust remover above dash demisting plate (Q9).

35. quicklime slakings according to claim 28 or 32 and dust arrester, the deduster (Q1) also include control system System (Q10), hydraulic gage (Q204), overflow pipe valve (Q503) and moisturizing pipe valve (Q202) are connected with control system (Q10), control system System (Q10) control hydraulic gage (Q204), overflow pipe valve (Q503) and moisturizing pipe valve (Q202).

36. quicklime slakings and dust pelletizing system, it include digester (1) according to any one of claim 1-35, Wet dust collector (Q1), also includes extractor fan (A1), chimney (A2), dusting waste water treatment device (A3), sludge treatment equipment (A4), cleaning device (A5) and Slaked lime conveying device (A6) and batch mixer (A7), wet dust collector (Q1) pass through a dedusting Pipeline (Q4) is connected with the external tapping that gathers dust (601) of digester (1)；Slaked lime conveying device (A6) is located at digester (1) Discharging opening (9) place, batch mixer (A7) are connected with Slaked lime conveying device (A6), the net air outlet of wet dust collector (Q1) (Q303) it is connected with chimney (A2) by extractor fan (A1), at the overflow pipe (Q502) of wet dust collector (Q1) and dedusting sewage Reason device (A3) connection, the sewage sludge tapping equipment (Q203) of dedusting pond (Q2) bottom is with sludge treatment equipment (A4) even Connect, dusting waste water treatment device (A3) is connected with cleaning device (A5), optionally, at dusting waste water treatment device (A3) and sludge Reason device (A4) connection.

37. quicklime slakings according to claim 36 and dust pelletizing system, it is characterised in that：Sludge treatment equipment (A4) is wrapped Press filtration water out and press filtration sludge outlet is included, press filtration water out is connected with cleaning device (A5), press filtration sludge outlet and digester (1) connect.