阅读说明：本技术 一种垃圾焚烧厂石灰浆制备系统的除尘方法 (Dust removal method for lime slurry preparation system of waste incineration plant ) 是由 张雷 刘志鹏 郑伟 于 2020-12-31 设计创作，主要内容包括：一种垃圾焚烧厂石灰浆制备系统的除尘方法,包括消化步骤、稀释步骤及回流步骤,石灰在消化过程产生的湿热蒸汽根据流动方向,通过所述蒸汽收集管道进入文丘里负压抽吸洗涤装置的入口进入文丘里负压抽吸洗涤装置,在所述文丘里负压抽吸洗涤装置内,与所述第一石灰浆回流管道的回流浆液混合,实现水洗去除,去除后混合液回流至所述稀释罐。通过增加石灰浆回流管道,利用石灰浆输送装置的输出浆一小部份输送至雾化器而大部份经所述第一入口流入文丘里负压抽吸洗涤装置,在文丘里管中,湿热蒸汽与回流浆液混合凝结,最终回流至稀释罐,有效地对湿热蒸汽进行消除。可以有效地解决现有技术问题。(The dust removal method of the lime slurry preparation system of the waste incineration plant comprises a digestion step, a dilution step and a backflow step, wherein moist heat steam generated in the digestion process of lime enters a Venturi negative pressure suction washing device through a steam collecting pipeline according to the flowing direction and enters the Venturi negative pressure suction washing device, the moist heat steam is mixed with backflow slurry of a first lime slurry backflow pipeline in the Venturi negative pressure suction washing device to be removed through water washing, and the removed mixed solution flows back to a dilution tank. By adding a lime slurry backflow pipeline, a small part of output slurry of the lime slurry conveying device is conveyed to the atomizer, and the large part of output slurry flows into the Venturi negative pressure suction washing device through the first inlet, in the Venturi tube, wet and hot steam and backflow slurry are mixed and condensed and finally flow back to the dilution tank, and the wet and hot steam is effectively eliminated. The problems of the prior art can be effectively solved.)

1. A dust removal method for a lime slurry preparation system of a waste incineration plant is characterized by comprising the following steps:

the method comprises the steps of firstly, digesting, namely according to the lime slurry preparation and adding use process, when a dilution tank sends a low liquid level signal, conveying lime in a lime bin to a digestion tank through a lime discharge valve and a screw conveyor, and simultaneously, feeding tap water in a certain proportion into the digestion tank through a first tap water branch pipeline to digest the lime;

secondly, a dilution step, namely, as the liquid level of the digestion tank rises, slaked lime slurry overflows to the dilution tank through an overflow pipeline of the digestion tank, meanwhile, a tap water inlet valve of a second tap water branch pipeline is opened, tap water in a certain proportion enters the dilution tank, and the lime slurry is diluted to a proper preset concentration; when the liquid level of the dilution tank reaches a high liquid level, the lime slurry preparation is stopped;

thirdly, a backflow step, namely conveying the lime slurry in the dilution tank to an atomizer through a slurry output pipeline through a lime slurry conveying pump for deacidification of flue gas, and refluxing the residual lime slurry to the dilution tank through a first lime slurry backflow pipeline;

the method is characterized in that in the first step, moist heat steam generated in the lime slaking process enters a venturi negative pressure suction washing device through an inlet of a steam collecting pipeline and enters the venturi negative pressure suction washing device according to the flowing direction, the moist heat steam is mixed with backflow slurry of a first lime slurry backflow pipeline in the venturi negative pressure suction washing device to be removed through water washing, and the removed mixed solution flows back to the dilution tank.

2. The dust removing method for lime mud preparation system of garbage incineration plant according to claim 1, wherein in the third step, a second lime mud return pipe is further provided, the lime mud in the dilution tank is conveyed to the atomizer through the lime mud conveying pump, and then divided into two paths, one path flows into the venturi negative pressure suction washing device through the first lime mud return pipe, and the other path directly flows back to the dilution tank through the second lime mud return pipe.

3. The dust removing method of the lime mud preparation system of the waste incineration plant according to claim 1, wherein a venturi flushing pipe is further provided, one end of the venturi flushing pipe is connected with a tap water pipe, the other end of the venturi flushing pipe is connected with one inlet of the venturi negative pressure suction washing device through a first tee, a second tee is provided on the second tap water branch pipe, tap water in the second tap water branch pipe is divided into two paths through the second tee, one path enters the venturi negative pressure suction washing device to flush the tap water, and the other path enters the dilution tank.

Technical Field

The invention relates to a dust removal method for a lime slurry preparation system of a waste incineration plant.

Background

With the rapid development of waste incineration power generation, the design and management of a flue gas treatment system of the waste incineration power generation system are increasingly mature and standard, in the aspect of flue gas deacidification process, a semi-dry deacidification system is generally adopted as a main deacidification process at present, and a dry deacidification system or a wet deacidification system is supplemented as an auxiliary deacidification process according to local emission standards. At present, a mainstream semidry deacidification system adopts a mode of spraying lime slurry by a high-speed rotary atomizer, and in order to ensure the high efficiency of neutralization reaction and take treatment cost into consideration, a lime slurry preparation system needs to be constructed in a matching manner, and the lime slurry is prepared on site by adopting quicklime.

The lime slurry preparation system mainly comprises a lime storage bin, a digestion tank, a dilution tank, a lime slurry conveying pump, a slurry conveying pipeline and the like. According to the lime slurry preparation and adding use process, when the dilution tank sends a low liquid level signal, lime in the lime bin is conveyed to the digestion tank through the lime discharge valve and the screw conveyor, meanwhile, tap water in a certain proportion enters the digestion tank to digest the lime, along with the rise of the liquid level of the digestion tank, the digested lime slurry overflows to the dilution tank through the overflow pipeline of the digestion tank, meanwhile, the tap water inlet valve of the dilution tank is opened to dilute the lime slurry to a proper preset concentration, and when the liquid level of the dilution tank reaches a high liquid level, the lime slurry preparation is stopped. Lime slurry in the dilution tank is conveyed to the atomizer through a lime slurry conveying pump and a lime slurry circulating pipeline for deacidification of flue gas, and the residual lime slurry flows back to the dilution tank. The flow of the lime slurry delivery pump is far greater than the actual lime slurry demand of the atomizer, and the delivery capacity of the lime slurry pump is usually 5-7 times of the actual demand of the atomizer, so that the flow rate of a pipeline is increased, the blockage of the delivery pipeline is avoided, and the residual lime slurry flows back to the dilution tank. Since the digestion process is exothermic, a certain amount of damp and hot steam carrying lime powder is generated in the digestion tank. At present, the part of steam is treated in a centralized spraying and washing mode after being sucked by a centrifugal fan, but the steam is easy to cause scaling and blockage of a spraying and washing system comprising a fan due to the fact that lime powder is carried in the steam, the spraying and washing system is difficult to stably run for a long time, and the system maintenance workload is large.

Disclosure of Invention

In order to solve the problems of unstable operation and large maintenance workload of a digestion tank hot steam washing system when lime slurry is prepared in a waste incineration plant, the invention provides a lime slurry preparation system of the waste incineration plant, which comprises a digestion device, a diluting device and a lime slurry conveying device; still include venturi dust collector, still set up first lime thick liquid return line, lime thick liquid return line one end with go out the pump line connection and the other end with venturi negative pressure suction washing device's first entry is connected. A steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank. By adding a lime slurry backflow pipeline, a small part of output slurry of the lime slurry conveying device is conveyed to the atomizer, and the large part of output slurry flows into the Venturi negative pressure suction washing device through the first inlet, in the Venturi tube, wet and hot steam and backflow slurry are mixed and condensed and finally flow back to the dilution tank, and the wet and hot steam is effectively eliminated.

The technical scheme adopted by the invention for solving the technical problems is as follows: a lime slurry preparation system of a waste incineration plant comprises a digestion device, a dilution device and a lime slurry conveying device, wherein a solution prepared by the digestion device flows into the dilution device and is conveyed to an atomizer through the lime slurry conveying device;

the slaking device comprises a lime bin, an ash discharge valve, a screw conveyor and a slaking tank in sequence according to the flowing direction of lime slurry, and further comprises a first tap water branch pipeline flowing into the slaking tank;

the diluting device comprises a diluting tank, an overflow pipeline flowing into the diluting tank from the digestion tank, and a second tap water branch pipeline connected into the diluting tank;

the lime slurry conveying device comprises a conveying pump, a pump inlet pipeline flowing into the conveying pump from the dilution tank, and a slurry output pipeline conveyed to an atomizer by the conveying pump;

the system is characterized by further comprising a Venturi dust removal device, wherein the Venturi dust removal device comprises a Venturi negative-pressure suction washing device and a first lime slurry backflow pipeline, one end of the first lime slurry backflow pipeline is connected with the slurry output pipeline, and the other end of the first lime slurry backflow pipeline is connected with a first inlet of the Venturi negative-pressure suction washing device;

a steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank.

Preferably, a second lime slurry backflow pipeline is further arranged, one end of the second lime slurry backflow pipeline is connected with the first lime slurry backflow pipeline, and the other end of the second lime slurry backflow pipeline is directly connected into the dilution tank.

Preferably, still set up venturi flushing pipe way, venturi flushing pipe way one end with second running water branch pipe says and the other end through the tee bend with first return pipe says and inserts together venturi negative pressure suction washing device's first entry sets up the valve on the pipeline, switches through the valve and right venturi negative pressure suction washing device washes.

A dust removal method for a lime slurry preparation system of a waste incineration plant is characterized by comprising the following steps:

firstly, according to the lime slurry preparation and adding use process, when a dilution tank sends a low liquid level signal, lime in a lime bin is conveyed to a digestion tank through a lime discharge valve and a screw conveyor, and meanwhile, tap water in a certain proportion enters the digestion tank through a first tap water branch pipeline to carry out digestion treatment on the lime;

secondly, as the liquid level of the digestion tank rises, slaked lime slurry overflows to a dilution tank through an overflow pipeline of the digestion tank, meanwhile, a tap water inlet valve of a second tap water branch pipeline is opened, tap water with a certain proportion enters the dilution tank, and the lime slurry is diluted to a proper preset concentration;

thirdly, when the liquid level of the dilution tank reaches a high liquid level, the preparation of the lime slurry is stopped;

fourthly, lime slurry in the dilution tank is conveyed to an atomizer through a slurry output pipeline through a lime slurry conveying pump for deacidification of flue gas, and the rest lime slurry flows back to the dilution tank through a first lime slurry backflow pipeline;

the method is characterized in that in the first step, moist heat steam generated in the lime slaking process enters a venturi negative pressure suction washing device through an inlet of a steam collecting pipeline and enters the venturi negative pressure suction washing device according to the flowing direction, the moist heat steam is mixed with backflow slurry of a first lime slurry backflow pipeline in the venturi negative pressure suction washing device to be removed through water washing, and the removed mixed solution flows back to the dilution tank.

Preferably, in the fourth step, a second lime slurry backflow pipeline is further provided, the lime slurry in the dilution tank is conveyed to the atomizer through a lime slurry conveying pump, and then is divided into two paths, one path flows into the venturi negative pressure suction washing device through the first lime slurry backflow pipeline, and the other path directly flows back to the dilution tank through the second lime slurry backflow pipeline.

Preferably, still set up the venturi and wash the pipeline, venturi wash pipeline one end with water piping connection and the other end through first tee bend with venturi negative pressure suction washing device's an entry linkage set up the second tee bend on the second running water lateral conduit, through the second tee bend divide into two the tunnel with the running water of second running water lateral conduit, gets into all the way venturi negative pressure suction washing device washes it and another way gets into the dilution tank.

The invention has the beneficial effects that: the invention provides a lime slurry preparation system for a waste incineration plant, which is characterized in that a Venturi dust removal device is arranged, the Venturi dust removal device comprises a Venturi negative pressure suction washing device, a lime slurry backflow pipeline is additionally arranged, a part of slurry in a slurry output pipeline of a lime slurry conveying device flows through the Venturi negative pressure suction washing device, in the Venturi pipe, wet and hot steam and backflow slurry are mixed and condensed, and finally, the mixture flows back to a dilution tank, so that the wet and hot steam is effectively eliminated.

Drawings

Fig. 1 is a schematic diagram of the arrangement of the apparatus according to the first embodiment of the present invention.

Fig. 2 is a schematic diagram of the arrangement of the apparatus according to a second embodiment of the present invention.

Fig. 3 is a schematic view of the arrangement of the apparatus according to the third embodiment of the present invention.

Fig. 4 is a schematic view of the arrangement of the apparatus according to the fourth embodiment of the present invention.

In the figure:

1, 1.1 lime bin, 1.2 ash discharge valve, 1.3 screw conveyer, 1.4 digestion tank and 1.5 first tap water branch pipeline;

2, a diluting device, 2.1 a diluting tank, 2.2 an overflow pipeline, 2.3A second tap water branch pipeline, 2.3A Venturi flushing pipeline and 2.31 a second tee joint;

3, a lime slurry conveying device, 3.1 conveying pumps, 3.2A pump inlet pipelines and 3.2B slurry outlet pipelines;

4 venturi dust collector, 4.1 venturi negative pressure suction washing device, 4.1A1 venturi first entry, 4.1A2 venturi second entry, 4.1B venturi export, 4.2 first lime thick liquid return line, 4.2A second lime thick liquid return line, 4.21 first tee bend, 4.3 steam collecting tube.

Detailed Description

Fig. 1 is a schematic diagram of the arrangement of the apparatus according to the first embodiment of the present invention. The figure shows that in the embodiment, the lime slurry preparation system of the waste incineration plant comprises a digestion device 1, a diluting device 2 and a lime slurry conveying device 3; the solution prepared in the digestion unit 1 flows into the dilution unit 2 and is then transported to the atomizer via the lime slurry transport unit 3.

The slaking device 1 sequentially comprises a lime bin 1.1, an ash discharge valve 1.2, a screw conveyor 1.3 and a slaking tank 1.4 according to the flowing direction of lime slurry, and also comprises a first tap water branch pipeline 1.5 flowing into the slaking tank;

the diluting device 2 comprises a diluting tank 2.1, an overflow pipeline 2.2 flowing from the digesting tank 1.4 to the diluting tank 2.1, and a second tap water branch pipeline 2.3 connected to the diluting tank 2.1;

the lime slurry conveying device 3 comprises a conveying pump 3.1, a pump inlet pipeline 3.2A flowing into the conveying pump 3.1 from the dilution tank 2.1, and a slurry output pipeline 3.2B conveyed to an atomizer by the conveying pump 3.1;

in the figure, the device also comprises a Venturi dust removal device 4, the Venturi dust removal device comprises a Venturi negative pressure suction washing device 4.1, a first lime slurry return pipeline 4.2 is also arranged, one end of the first lime slurry return pipeline 4.2 is connected with the slurry output pipeline 3.2B, and the other end of the first lime slurry return pipeline is connected with a first inlet 4.1A1 of the Venturi negative pressure suction washing device 4.1;

a steam collecting pipeline 4.3 is further arranged at the top of the digestion tank 1.4, one end of the steam collecting pipeline 4.3 is connected with the digestion tank 1.5, and the other end is connected with a second inlet 4.1A2 of the Venturi negative pressure suction washing device 4.1; the outlet 4.1B of the venturi negative pressure suction washing device 4.1 is connected to the dilution tank 2.1.

It is shown that in this example, by adding a first lime mud return line 4.2, a part of the mud in the mud outlet line 3.2B of the lime mud delivery device is made to flow through the venturi suction scrubber, where the moist heat steam is mixed with the returned mud and condensed, and finally returned to the dilution tank, thus effectively eliminating the moist heat steam.

Fig. 2 is a schematic diagram of the arrangement of the apparatus according to a second embodiment of the present invention. In the figure it is shown that, in contrast to the first embodiment, a second lime mud return line 4.2A is also provided, which second lime mud return line 4.2A is connected at one end to the first lime mud return line 4.2 and at the other end directly into the dilution tank 2.1.

Fig. 3 is a schematic view of the arrangement of the apparatus according to the third embodiment of the present invention. In the figure, it is shown that, unlike the first embodiment, in this example, a venturi flushing pipe 2.3A is further provided, one end of the venturi flushing pipe 2.3A is connected to the second tap water branch pipe 2.3, and the other end is connected to the first inlet 4.1a1 of the venturi negative pressure suction washing device 4.1 together with the first return pipe 4.2 through a first tee joint 4.21, and a valve is provided in the pipe to flush the venturi negative pressure suction washing device 4.1 through valve switching.

As shown in FIG. 1, the invention provides a dust removal method for a lime slurry preparation system of a waste incineration plant, which comprises the following steps:

firstly, according to the lime slurry preparation and feeding use process, when a dilution tank 2.1 sends a low liquid level signal, lime in a lime bin 1.1 is conveyed to a digestion tank 1.4 through a lime discharge valve 1.2 and a screw conveyor 1.3, and meanwhile, tap water in a certain proportion enters the digestion tank 1.4 through a first tap water branch pipeline 1.5 to carry out digestion treatment on the lime;

secondly, as the liquid level of the digestion tank 1.4 rises, the slaked lime slurry overflows to the dilution tank 2.1 through an overflow pipeline 2.2 of the digestion tank 1.4, meanwhile, a tap water inlet valve of a second tap water branch pipeline 2.3 is opened, tap water with a certain proportion enters the dilution tank 2.1, and the lime slurry is diluted to be suitable for preset concentration;

thirdly, when the liquid level of the dilution tank 2.1 reaches a high liquid level, the lime slurry preparation is stopped;

fourthly, lime slurry in the dilution tank 2.1 is conveyed to an atomizer through a slurry output pipeline 3.2B through a lime slurry conveying pump 3.1 for deacidification of flue gas, and the rest lime slurry flows back to the dilution tank 2.1 through a first lime slurry return pipeline 4.2;

the method is characterized in that in the first step, moist heat steam generated in the lime slaking process enters a venturi negative pressure suction washing device 4.1 through an inlet of a steam collecting pipeline 4.3 according to the flowing direction, enters the venturi negative pressure suction washing device 4.1, is mixed with backflow slurry of a first lime slurry backflow pipeline 4.2 in the venturi negative pressure suction washing device 4.1, is removed through water washing, and the removed mixed solution flows back to a dilution tank 2.1.

As shown in fig. 2, the present invention suggests that, in another embodiment, in the fourth step, a second lime slurry backflow pipe 4.2A is further provided, the lime slurry in the dilution tank 2.1 is conveyed to the atomizer by a lime slurry conveying pump 3.1, and then is divided into two paths, one path flows into the venturi negative pressure suction washing device through the first lime slurry backflow pipe 4.2, and the other path directly flows back to the dilution tank 2.1 through the second lime slurry backflow pipe 4.2A.

As shown in fig. 2, the present invention suggests that, in another embodiment, a venturi flushing pipe 2.3A is further provided, one end of the venturi flushing pipe 2.3A is connected to a tap water pipe, and the other end is connected to one inlet 4.1a1 of the venturi negative pressure suction washing device 4.1 through a first tee 4.21, a second tap water branch pipe 2.3 is provided with a second tee 2.31, tap water in the second tap water branch pipe 2.3 is divided into two paths through the second tee 2.31, one path enters the venturi negative pressure suction washing device 4.1 to flush the tap water, and the other path enters the dilution tank 2.1.