CN111068500A - Circulating fluidized bed flue gas desulfurization system - Google Patents
Circulating fluidized bed flue gas desulfurization system Download PDFInfo
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- CN111068500A CN111068500A CN201911339675.8A CN201911339675A CN111068500A CN 111068500 A CN111068500 A CN 111068500A CN 201911339675 A CN201911339675 A CN 201911339675A CN 111068500 A CN111068500 A CN 111068500A
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- pipeline
- fluidized bed
- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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Abstract
The utility model relates to a circulating fluidized bed flue gas desulfurization system, which belongs to the field of flue gas treatment equipment and comprises a process water tank, wherein the process water tank is connected with an inlet of a booster water pump through a pipeline; a pipeline is also connected between the outlet of the booster water pump and the inlet of the flow control switch, a second spray gun is connected on the pipeline, and the second spray gun can spray process water into the fluidized bed; through direct injection process water and desulfurization thick liquid in to the fluidized bed simultaneously, can increase the humidity of desulfurization thick liquid in the fluidized bed, avoid the desulfurization thick liquid by solid state, improve the reaction rate of desulfurization thick liquid and gaseous pollutant in the flue gas.
Description
Technical Field
The invention relates to the technical field of flue gas treatment equipment, in particular to a circulating fluidized bed flue gas desulfurization system.
Background
During the operation of industrial boilers and power plant boilers, a lot of SO is generated2、SO3And flue gas of gaseous pollutants such as HF, etc., which can seriously affect the atmospheric environment once discharged into the air, and in recent years, the stateEnvironmental quality is more and more emphasized, emission is strictly controlled, and the research work of CFB-FGD technology of power plant boilers and industrial boilers is started from the 70 s of the 20 th century in China, and at present, the technology of flue gas desulfurization mainly comprises the following steps: the guniting method, the semi-dry semi-wet method and the dry method are adopted, researchers also test different desulfurization modes, and practical tests prove that under the same working condition, the guniting method has the highest desulfurization effect, the water spraying and wetting method is the second time, and the dry method is the worst; the dry method cannot precisely control the concentration thereof, so that the consumption of the desulfurizing agent may be increased due to the concentration thereof in the desulfurization reaction, and the desulfurization by-products may be increased, and the concentration of the desulfurization slurry in the slurry-injection method is easily controlled, and thus it is currently recommended. However, the existing injected desulfurization slurry can not realize the online concentration control, when the desulfurization slurry with specific concentration is needed, the desulfurization slurry with specific concentration needs to be separately prepared, and in addition, when the desulfurization slurry is injected into a fluidized bed, a problem also exists that: the moisture in the desulfurized slurry is gasified quickly to cause the phenomenon of lime slurry solidification, and further the reaction rate of the desulfurized slurry and gaseous pollutants in the flue gas is influenced, so that the desulfurized slurry with required concentration can be prepared quickly and accurately, and a desulfurization system capable of ensuring that the desulfurized slurry is not solidified when being sprayed into a fluidized bed is designed to solve the problems.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
This application is in order to solve present guniting method desulfurization in-process desulfurization slurry by the solidification in the fluidized bed, reduces the problem of the reaction rate of gaseous pollutant in desulfurization slurry and the flue gas, can also solve the problem that present guniting method can not realize the online regulation and control of concentration simultaneously, so design a circulating fluidized bed flue gas desulfurization system, it specifically is:
a circulating fluidized bed flue gas desulfurization system comprises a process water tank, wherein the process water tank is connected with an inlet of a booster water pump through a pipeline, an outlet of the booster water pump is connected with an inlet of a pulping tank through a pipeline, a flow control switch is arranged on the pipeline between the outlet of the booster water pump and the inlet of the pulping tank, the pulping tank is also connected with a stock bin through a pipeline, a weighing control component is arranged on the pipeline between the stock bin and the pulping tank, an outlet of the pulping tank is connected with the inlet of a slurry booster pump through a pipeline, an outlet of the slurry booster pump is connected with a first spray gun through a pipeline, and the first spray gun can spray desulfurization slurry into a fluidized bed; a pipeline is also connected between the outlet of the booster water pump and the inlet of the flow control switch, a first switch is arranged on the pipeline, a second spray gun is connected on the pipeline, and the second spray gun can spray process water into the fluidized bed.
Preferably, the first spray gun is arranged in the fluidized bed, the spraying direction of the first spray gun is parallel to and in the same direction as the flowing direction of the flue gas, and a second switch is arranged on a pipeline between the first spray gun and the slurry booster pump.
Preferably, the second lance is also disposed within the fluidized bed and is disposed parallel and co-directional to the first lance.
Preferably, a digital display flowmeter is further arranged on a pipeline between the outlet of the booster water pump and the inlet of the flow control switch.
Further preferably, the method further comprises the following steps: and the compressed gas pipeline is communicated with the first spray gun.
Preferably, the compressed gas conduit is also in communication with the second lance.
Preferably, a return pipeline is connected between the outlet of the booster water pump and the process water tank.
Preferably, a pipeline is further communicated between the pipeline between the outlet of the booster water pump and the inlet of the pulping tank and the outlet of the pulp booster pump, and a third switch is arranged on the pipeline.
Preferably, the weighing control component is a spiral weighing feeder which is arranged between the stock bin and the pulping tank.
Preferably, a feeding switch is further arranged between the spiral weighing feeder and the storage bin.
The invention can increase the humidity of the desulfurization slurry in the fluidized bed by directly and simultaneously spraying the process water and the desulfurization slurry into the fluidized bed, avoid the desulfurization slurry from being solidified, improve the reaction rate of the desulfurization slurry and gaseous pollutants in flue gas, simultaneously realize the on-line preparation of the desulfurization slurry with required concentration by arranging the process water tank, the storage bin, the communicated pipeline, the flow control switch and the weighing control assembly which are arranged on the pipeline, reduce or increase the concentration of the desulfurization slurry by introducing the process water or the lime powder and controlling the specific introduction amount, and realize the on-line regulation and control of the concentration.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, 1, a process water tank, 2, a booster water pump, 3, a flow control switch, 4, a storage bin, 5, a feeding switch, 6, a weighing control component, 7, a pulping tank, 8, a pulp booster pump, 9, a third switch, 10, a second switch, 11, a first switch, 12, a compressed gas pipeline, 13, a backflow pipeline, 14, a fluidized bed, 15, a second spray gun, 16, a first spray gun, 17, a venturi tube, 18, flue gas, 19 and a digital display flow meter.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1, in order to solve the problems in the background art, the present application designs a circulating fluidized bed flue gas desulfurization system, which includes a process water tank 1, the process water tank 1 is connected to an inlet of a booster water pump 2 through a pipeline, in this embodiment, the booster water pump 2 is a variable-frequency booster water pump, and specifically, the model of the booster water pump 2 is selected by a person skilled in the art according to actual work needs on site, which is not described herein; an outlet of the booster water pump 2 is connected with an inlet of a pulping tank 7 through a pipeline, the pulping tank 7 in the prior art is the pulping tank 7 in the prior art, and a stirrer exists in the pulping tank in the prior art, so that process water and lime powder can be well mixed in the pulping tank, such as a French Sodimate pulping tank, and therefore, in the embodiment, detailed description is omitted for the specific structure of the pulping tank 7, a flow control switch 3 is arranged on the pipeline between the outlet of the booster water pump 2 and the inlet of the pulping tank 7, the flow control switch 3 can monitor the flow of the process water and can realize the purpose of automatically opening and closing the process water after quantitative input, and in an alternative embodiment, the flow control switch 3 can also be realized by a flowmeter; the pulping tank 7 is also connected with a stock bin 4 through a pipeline, a weighing control component 6 is arranged on the pipeline between the stock bin 4 and the pulping tank 7, the weighing control component 6 can control the amount of the stock bin 4 which is led into the pulping tank 7, and further control the matching proportion of the lime powder in the stock bin 4 and the process water to prepare lime slurry with different concentrations, the preparation proportion is 20% concentration under general conditions, however, in specific application, the lime slurry with specific proportion can be prepared according to the concentration of gaseous pollutants in the fluidized bed, when low concentration is required, the concentration in the pulping tank 7 can be reduced by calculating the amount of the process water, when high concentration is required, the concentration in the pulping tank 7 can be improved by calculating the amount of the lime powder, online regulation and control are realized, and the operation is more convenient and rapid, the outlet of the pulping tank 7 is connected with the inlet of the pulp booster pump 8 through a pipeline, the slurry booster pump 8 can pump the desulfurization slurry in the slurry tank 7 into the fluidized bed 14, in this embodiment, the slurry booster pump 8 adopts a slurry pump in the prior art, for example, a TLB series lime slurry pump of the jiangsu amai pump group, and the type selection of the slurry pump is performed according to specific parameters in the existing use, which is not described herein, and an outlet of the slurry booster pump 8 is connected to a first spray gun 16 through a pipeline, in this embodiment, the first spray gun 16 adopts a two-fluid spray gun, the first spray gun 16 can spray the desulfurization slurry into the fluidized bed 14, and at the same time, the first spray gun 16 is also communicated with a compressed gas pipeline 12, so that under the action of the compressed gas, the first spray gun 16 can atomize the sprayed desulfurization slurry, and the uniformity of the desulfurization slurry is improved; a pipeline is also connected between the outlet of the booster water pump 2 and the inlet of the flow control switch 3, a first switch 11 is arranged on the pipeline, process water is communicated on the pipeline, a second spray gun 15 is connected on the pipeline, the second spray gun 15 is also a double-fluid spray gun, the compressed gas pipeline 12 is also communicated with the second spray gun 15, the second spray gun 15 is enabled to spray mist process water into the fluidized bed 14, and therefore, the humidity of the desulfurization slurry in the fluidized bed can be increased by directly spraying the process water and the desulfurization slurry into the fluidized bed 14 at the same time, the desulfurization slurry is prevented from being solidified, and the reaction rate of the desulfurization slurry and gaseous pollutants in the flue gas 18 is increased.
Further, in order to prevent the flue gas 18 and the discharged desulfurization slurry from clogging the first lance 16 and the second lance 15, the first lance 16 is provided in the fluidized bed 14, and the injection direction of the first lance 16 is parallel to and in the same direction as the flow direction of the flue gas 18, and the second lance 15 is also provided in the fluidized bed 14, and is parallel to and in the same direction as the first lance 16. In addition, in order to enhance the contact time and area between the flue gas 18 and the desulfurization slurry, a venturi tube 17 is provided at the front end of the fluidized bed 14 to which the flue gas 18 is fed, and the venturi tube 17 can accelerate the flue gas 18 to increase the turbulence degree between the flue gas 18 and the desulfurization slurry, so that the reaction is sufficient, and a second switch 10 is further provided on the pipe between the first spray gun 16 and the slurry booster pump 8, and the second switch 10 can control the desulfurization operation by controlling the on/off of the desulfurization slurry fed into the first spray gun 16.
Further, in order to roughly grasp the amount of the injected process water according to the temperature height in the fluidized bed 14, a digital display flow meter 19 is further provided on the pipe between the outlet of the booster water pump 2 and the inlet of the flow control switch 3.
In an alternative embodiment, the digital display flow meter 19 may also be a flow control valve or the like.
Further, under normal conditions, after desulfurization, used water remains in the booster water pump 2 and the pipeline, and in order to prevent the booster water pump 2 and the pipeline from being damaged under the condition of low temperature, a return pipeline 13 is connected between the outlet of the booster water pump 2 and the process water tank 1, so that after desulfurization, when the whole system does not work, the water in the booster water pump 2 and the pipeline automatically flows back to the process water tank 1 under the action of gravity, it is to be noted that when the whole system is actually installed, the process water tank 1 and the booster water pump 2 are arranged on the ground, the stock bin 4, the pulping tank 7 and the fluidized bed 14 in the figure are not provided with fixing frames and do not represent suspended arrangement, and the fixing frames are only a conventional and necessary design in eyes of technicians in the field, during actual operation, the fixing is carried out according to actual conditions, and are not shown in the attached drawings of the application, the drawings are schematic representations of the desulfurization system and do not represent actual installation height and location, and therefore the design and return flow described above are possible.
Furthermore, a pipeline is communicated between a pipeline between an outlet of the booster water pump 2 and an inlet of the pulping tank 7 and an outlet of the slurry booster pump 8, a third switch 9 is arranged on the pipeline, the pipeline can be flushed with the desulfurized slurry, the flushing process is performed when the desulfurized slurry is not desulfurized, the desulfurized slurry is prevented from blocking the pipeline, the process water is pumped into the pipeline by the booster water pump 2 and flushed with the pipeline between the slurry booster pump 8 and the first spray gun 16, and the flushed process water is sprayed into the fluidized bed 14 through the first spray gun 16.
Further, weigh for the lime powder in the feed bin 4 of more accurate, control the volume that lime got into in the pulping tank 7, adopt the spiral batcher of weighing above-mentioned weighing control subassembly 6, the spiral batcher of weighing sets up between feed bin 4 and pulping tank 7, the spiral batcher of weighing can once only weigh when carrying, avoid the great problem of weighing error that traditional process multichannel transmission brought, the control accuracy of slurrying concentration has been improved, avoid increasing the consumption of desulfurization thick liquid and the volume of desulfurization accessory substance because of the concentration difference is great.
Further, still be equipped with feed switch 5 between spiral weighing feeder and the feed bin 4, when preparing the desulfurization thick liquid, feed switch 5 opens for lime powder in the feed bin 4 gets into slurrying jar 7, and after the feeding finishes, feed switch 5 closes.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (10)
1. A circulating fluidized bed flue gas desulfurization system is characterized by comprising a process water tank, wherein the process water tank is connected with an inlet of a booster water pump through a pipeline, an outlet of the booster water pump is connected with an inlet of a pulping tank through a pipeline, a flow control switch is arranged on the pipeline between the outlet of the booster water pump and the inlet of the pulping tank, the pulping tank is also connected with a stock bin through a pipeline, a weighing control component is arranged on the pipeline between the stock bin and the pulping tank, the outlet of the pulping tank is connected with the inlet of a slurry booster pump through a pipeline, the outlet of the slurry booster pump is connected with a first spray gun through a pipeline, and the first spray gun can spray desulfurization slurry into a fluidized bed; a pipeline is further connected between the outlet of the booster water pump and the inlet of the flow control switch, a first switch is arranged on the pipeline, a second spray gun is connected onto the pipeline, and the second spray gun can spray process water into the fluidized bed.
2. The circulating fluidized bed flue gas desulfurization system of claim 1, wherein the first lance is disposed in the fluidized bed and has a spraying direction parallel to and in the same direction as the flow direction of the flue gas, and a second switch is disposed on the pipe between the first lance and the slurry booster pump.
3. The circulating fluidized bed flue gas desulfurization system of claim 2, wherein the second lance is also disposed within the fluidized bed and is disposed parallel and co-directional to the first lance.
4. The circulating fluidized bed flue gas desulfurization system of claim 1, wherein a digital display flow meter is further disposed on the pipeline between the outlet of the booster water pump and the inlet of the flow control switch.
5. The circulating fluidized bed flue gas desulfurization system of claim 1, further comprising:
a compressed gas conduit in communication with the first lance.
6. The circulating fluidized bed flue gas desulfurization system of claim 5, wherein the compressed gas conduit is further in communication with the second lance.
7. The circulating fluidized bed flue gas desulfurization system of claim 1, wherein a return line is further connected between the outlet of the booster water pump and the process water tank.
8. The circulating fluidized bed flue gas desulfurization system of claim 1, wherein a pipeline is further connected between the outlet of the booster water pump and the inlet of the slurrying tank and the outlet of the slurry booster pump, and a third switch is arranged on the pipeline.
9. The circulating fluidized bed flue gas desulfurization system of claim 1, wherein the weighing control component is a screw weight feeder disposed between the bin and the slurrying tank.
10. The circulating fluidized bed flue gas desulfurization system of claim 9, wherein a feed switch is further disposed between the screw weigh feeder and the bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911339675.8A CN111068500A (en) | 2019-12-23 | 2019-12-23 | Circulating fluidized bed flue gas desulfurization system |
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| CN201911339675.8A CN111068500A (en) | 2019-12-23 | 2019-12-23 | Circulating fluidized bed flue gas desulfurization system |
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| CN111068500A true CN111068500A (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112076616A (en) * | 2020-09-23 | 2020-12-15 | 浙江浙能技术研究院有限公司 | Dosing device and method based on operation condition of desulfurization tower of coal-fired unit |
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