CN113398687A

CN113398687A - Device and method for removing dust from gas

Info

Publication number: CN113398687A
Application number: CN202110856140.9A
Authority: CN
Inventors: 张寅旭; 罗烨栋; 瞿龙学; 曹亮; 汤奎山; 徐颖; 胡斌
Original assignee: Hoshine Silicon Industry Co ltd
Current assignee: Hesheng Silicon Jiaxing Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-09-17
Anticipated expiration: 2041-07-28
Also published as: CN113398687B

Abstract

The application provides a device and a method for removing dust from gas, relates to the technical field of chemical industry, and solves the technical problem that the energy consumption is large when the gas such as methyl chlorosilane synthesis gas is washed and removed at present. In the equipment, a first outlet of the washing tower is communicated with a first inlet of the primary condenser through a first conveying pipeline, and a first outlet of the primary condenser is communicated with a first inlet of the secondary condenser through a second conveying pipeline; a second outlet of the first-stage condenser is communicated with an inlet of a fifth conveying pipeline through a third conveying pipeline; a first outlet of the secondary condenser is communicated with an inlet of the fifth conveying pipeline through a fourth conveying pipeline; an outlet of the fifth conveying pipeline is communicated with the first inlet of the washing tower; the first valve is arranged at the first position of the third conveying pipeline, and the second valve is arranged at the second position of the fourth conveying pipeline. The device and the method for removing dust from gas provided by the application are used for removing dust from gas.

Description

Device and method for removing dust from gas

Technical Field

The application relates to the technical field of chemical industry, in particular to equipment and a method for removing dust from gas.

Background

At present, methyl chlorosilane is usually produced by a direct method, namely, methyl chloride and silicon powder are subjected to catalytic reaction under the action of a copper catalyst to obtain the methyl chlorosilane. However, because the side reaction is more, the methyl chlorosilane synthesis gas obtained by the reaction of methyl chloride and silicon powder not only contains methyl chlorosilane, but also contains a large amount of dust, and the synthesis gas needs to be further washed to remove the dust.

In the prior art, synthesis gas is generally introduced into a washing tower for washing, the synthesis gas after washing and dust removal sequentially enters a primary condenser and a secondary condenser for condensation to obtain condensate, and the condensate of the primary condenser and the condensate of the secondary condenser are both conveyed to the washing tower for reflux. However, because the washing method needs to convey the condensate of the first-stage condenser and the condensate of the second-stage condenser to the washing tower for reflux, the energy consumption of the washing process is large.

Disclosure of Invention

The invention provides equipment and a method for removing dust from gas, which can be used for solving the technical problem of higher energy consumption in the process of washing and removing dust from gas such as methyl chlorosilane synthesis gas at present.

In a first aspect, an embodiment of the present application provides an apparatus for removing dust from a gas, where the apparatus includes a scrubber, a primary condenser, a secondary condenser, a first conveying pipeline, a second conveying pipeline, a third conveying pipeline, a fourth conveying pipeline, a fifth conveying pipeline, a first valve, and a second valve;

wherein the scrubber has a first inlet and a first outlet; the primary condenser having a first inlet, a first outlet, and a second outlet; the secondary condenser has a first inlet and a first outlet;

a first outlet of the washing tower is communicated with a first inlet of the primary condenser through the first conveying pipeline, and a first outlet of the primary condenser is communicated with a first inlet of the secondary condenser through the second conveying pipeline;

a second outlet of the primary condenser is communicated with an inlet of the fifth conveying pipeline through the third conveying pipeline; a first outlet of the secondary condenser is communicated with an inlet of the fifth conveying pipeline through the fourth conveying pipeline; an outlet of the fifth conveying pipeline is communicated with a first inlet of the washing tower;

the first valve is arranged at a first position of the third conveying pipeline, and the second valve is arranged at a second position of the fourth conveying pipeline.

Optionally, in one embodiment, the apparatus further comprises a first storage tank;

wherein the first storage tank has a first inlet and a first outlet; the third conveying pipeline comprises a first conveying sub-pipeline and a second conveying sub-pipeline;

and a second outlet of the primary condenser is communicated with a first inlet of the first storage tank through the first conveying sub-pipeline, and a first outlet of the first storage tank is communicated with an inlet of the fifth conveying pipeline through the second conveying sub-pipeline.

Optionally, in one embodiment, the apparatus further comprises a second storage tank;

wherein the second storage tank has a first inlet and a first outlet; the fourth conveying pipeline comprises a third conveying sub-pipeline and a fourth conveying sub-pipeline;

and a first outlet of the second-stage condenser is communicated with a first inlet of the second storage tank through the third conveying sub-pipeline, and a first outlet of the second storage tank is communicated with an inlet of the fifth conveying sub-pipeline through the fourth conveying sub-pipeline.

Optionally, in one embodiment, the apparatus further comprises a sixth delivery line, the second storage tank further having a second inlet;

an inlet of the sixth conveying pipeline is communicated with a fourth position of the fifth conveying pipeline, and an outlet of the sixth conveying pipeline is communicated with a second inlet of the second storage tank.

Optionally, in one embodiment, the apparatus further comprises a third valve;

the third valve is disposed in a fifth position of the sixth delivery line.

Optionally, in one embodiment, the apparatus further comprises a seventh transfer line, a separation device and a second transfer pump,

wherein the separation device has an inlet and the second storage tank also has a second outlet;

the second outlet of the second storage tank is communicated with the inlet of the separation device through the seventh conveying pipeline;

the second delivery pump is arranged at a sixth position of the seventh delivery pipeline.

Optionally, in one embodiment, the apparatus further comprises an eighth delivery line and a fourth valve;

the inlet of the eighth delivery line is in communication with the seventh location of the seventh delivery line and the outlet of the eighth delivery line is in communication with the eighth location of the fifth delivery line;

the fourth valve is disposed at a ninth position of the eighth delivery pipe.

Optionally, in one embodiment, the apparatus further comprises a ninth delivery line and a fifth valve, the second storage tank further having a third inlet;

an inlet of the ninth conveying pipeline is communicated with the tenth position of the first conveying sub-pipeline, and an outlet of the ninth conveying pipeline is communicated with the third inlet of the second storage tank;

the fifth valve is disposed at an eleventh position of the ninth delivery pipe.

In a second aspect, embodiments of the present application further provide a method for dedusting gas by using the apparatus provided in the embodiments of the present application, the method including:

introducing gas into a washing tower to obtain first gas after dust removal;

introducing the first gas into a primary condenser for condensation to obtain a first condensate and a second gas; introducing the second gas into a secondary condenser for condensation to obtain second condensate;

feeding the first condensate to the scrubber for reflux and feeding the second condensate to a separation device;

wherein the temperature of the cooling liquid in the first-stage condenser is higher than the temperature of the cooling liquid in the second-stage condenser.

Optionally, in one embodiment, the first condensate is delivered to the scrubber for reflux by a first delivery pump, the second condensate is delivered to the separation device by a second delivery pump, and in case of failure of the first delivery pump, the method further comprises:

at least part of the second condensate is conveyed to the scrub column for reflux.

The invention has the following beneficial effects:

by adopting the equipment for removing dust from gas provided by the embodiment of the application, the equipment comprises a washing tower, a primary condenser, a secondary condenser, a first conveying pipeline, a second conveying pipeline, a third conveying pipeline, a fourth conveying pipeline, a fifth conveying pipeline, a first valve and a second valve; wherein the scrubber has a first inlet and a first outlet; the primary condenser having a first inlet, a first outlet, and a second outlet; the secondary condenser has a first inlet and a first outlet; a first outlet of the washing tower is communicated with a first inlet of the primary condenser through the first conveying pipeline, and a first outlet of the primary condenser is communicated with a first inlet of the secondary condenser through the second conveying pipeline; a second outlet of the primary condenser is communicated with an inlet of the fifth conveying pipeline through the third conveying pipeline; a first outlet of the secondary condenser is communicated with an inlet of the fifth conveying pipeline through the fourth conveying pipeline; an outlet of the fifth conveying pipeline is communicated with a first inlet of the washing tower; the first valve is arranged at a first position of the third conveying pipeline, and the second valve is arranged at a second position of the fourth conveying pipeline; through set up first valve and second valve respectively on third pipeline and fourth pipeline, can control first valve and open and control the second valve and close for only carry first condensate to the scrubbing tower and carry out the backward flow, reduce the volume that gets into the light component of scrubbing tower, thereby can reduce the energy consumption of washing process.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:

FIG. 1 is a schematic structural view of a dust removing apparatus provided in the prior art;

FIG. 2 is a schematic structural diagram of an apparatus for removing dust from a gas according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another apparatus for dedusting gas according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another apparatus for dedusting gas according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another apparatus for removing dust from a gas according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another apparatus for removing dust from gas according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another apparatus for dedusting gas according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another apparatus for removing dust from a gas according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another apparatus for removing dust from gas according to an embodiment of the present disclosure;

FIG. 10 is a schematic flow chart of a method for dedusting a gas according to an embodiment of the present application.

Reference numerals:

101-a washing tower; 102-a first-stage condenser; 103-a secondary condenser; 104-reflux drum.

20-a device for dedusting a gas; 201-a washing tower; 202-first stage condenser; 203-a secondary condenser; 204 — a first transfer line; 205 — a second transfer line; 206 — third transfer line; 2061-a first delivery sub-line; 2062-a second delivery sub-line; 207 — fourth transfer line; 2071 — third transfer sub-line; 2072 — fourth delivery sub-line; 208 — fifth transfer line; 209 — first valve; 210 — a second valve; 211 — a first delivery pump; 212 — a first storage tank; 213 — second storage tank; 214-sixth delivery line; 215 — third valve; 216 — seventh transfer line; 217-separation means; 218 — a second transfer pump; 219 — eighth transfer line; 220 — a fourth valve; 221-ninth transfer line; 222 — a fifth valve; 223-cyclone separator.

30-a device for dedusting a gas; 301-fluidized bed; 302-a cyclone separator; 303-a washing column; 304-a re-evaporator; 305 — first stage condenser; 306-a secondary condenser; 307 — a first storage tank; 308-a second storage tank; 309-separation means; 310 — a first delivery pump; 311-second delivery pump; 312 — a first delivery line; 313 — a second delivery line; 314 — third delivery line; 315 — fourth transfer line; 316-fifth delivery line; 317-sixth conveying pipeline; 318-seventh transfer line; 319 — eighth transfer line; 320-ninth delivery line; 321-tenth transfer line; 322-an eleventh transfer line; 323 — first valve; 324 — a second valve; 325 — third valve; 326 — fourth valve; 327 — a fifth valve; 328 — sixth valve; 329-seventh valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As described in the background of the present application, in the prior art, synthesis gas is generally introduced into a washing tower for washing, the synthesis gas after washing and dust removal sequentially enters a primary condenser and a secondary condenser for condensation to obtain condensate, and the condensate of the primary condenser and the condensate of the secondary condenser are both conveyed to the washing tower for reflux. As shown in fig. 1, a gas outlet of a scrubber 101 is connected to a gas inlet of a first-stage condenser 102, a gas outlet of the first-stage condenser 102 is connected to a gas inlet of a second-stage condenser 103, condensate outlets of the first-stage condenser 102 and the second-stage condenser 103 are both communicated with an inlet of a same reflux tank 104, and an outlet of the reflux tank 104 is communicated with a reflux inlet of the scrubber 101; that is, the condensate of the first-stage condenser 102 and the condensate of the second-stage condenser 103 flow into the same reflux drum 104 and then reflux to the scrubber 101 together. The temperature of the coolant for condensing the synthesis gas in the secondary condenser 103 is lower than the temperature of the coolant for condensing the synthesis gas in the primary condenser 102. After the synthesis gas enters the first-stage condenser 102, heavy components with higher boiling points in the synthesis gas are more easily condensed to obtain first condensate due to the larger temperature difference between the boiling points and the cooling liquid in the first-stage condenser 102, and the first condensate mainly contains the heavy components in the synthesis gas. The gas which is not condensed in the synthesis gas by the first-stage condenser 102 continues to enter the second-stage condenser 103, and because the temperature of the cooling liquid in the second-stage condenser 103 is lower, the light components which are not easy to be condensed in the first-stage condenser 102 and have lower boiling points are easier to be condensed in the second-stage condenser 103 to obtain a second condensate, wherein the second condensate mainly comprises the light components in the synthesis gas. However, the temperature of the syngas to be scrubbed in the scrubber 101 is high, if the first condensate and the second condensate are both delivered to the scrubber 101 to be refluxed to scrub the syngas, the light component in the second condensate is easily gasified into gas due to a low boiling point, which results in scrubbing effect of the syngas, and meanwhile, the gas and the scrubbed syngas enter the condenser again, which results in an increase in the amount of gas to be condensed by the condenser and an increase in the amount of required cooling liquid, thereby resulting in a large energy consumption in the whole scrubbing process.

In view of this, the embodiment of the present application provides an apparatus 20 for dedusting gas, as shown in fig. 2, the apparatus 20 includes a scrubber 201, a primary condenser 202, a secondary condenser 203, a first delivery pipe 204, a second delivery pipe 205, a third delivery pipe 206, a fourth delivery pipe 207, a fifth delivery pipe 208, a first valve 209, and a second valve 210; the scrubber 201 has a first inlet and a first outlet; the primary condenser 202 has a first inlet, a first outlet, and a second outlet; the secondary condenser 203 has a first inlet and a first outlet; a first outlet of the scrubber 201 is communicated with a first inlet of the primary condenser 202 through the first conveying pipe 204, and a first outlet of the primary condenser 202 is communicated with a first inlet of the secondary condenser 203 through the second conveying pipe 205; a second outlet of the primary condenser 202 communicates with an inlet of the fifth transfer line 208 through the third transfer line 206; a first outlet of the secondary condenser 203 is communicated with an inlet of the fifth conveying pipe 208 through the fourth conveying pipe 207; an outlet of the fifth conveying pipe 208 communicates with a first inlet of the scrub column 201; the first valve 209 is arranged in a first position A of the third supply line 206 and the second valve 210 is arranged in a second position B of the fourth supply line 207

Wherein the apparatus 20 can be used for scrubbing dusty gas such as methylchlorosilane synthesis gas, for the convenience of describing the apparatus 20 provided in the embodiments of the present application, the scrubbed gas will be described as methylchlorosilane synthesis gas.

The scrubber 201 may be used to introduce the synthesis gas to be scrubbed for scrubbing, and remove the copper powder, silicon powder and other dust therein. The scrubber 201 may also have a second inlet from which scrubbing liquid may enter the scrubber 201. In order to improve the washing effect, the syngas to be washed and the washing liquid may adopt a reverse contact washing manner, and accordingly, the first inlet for introducing the washing liquid may be disposed at the top of the washing tower 201, and the second inlet for introducing the syngas to be washed may be disposed at the bottom of the washing tower 201.

The first-stage condenser 202 may be configured to primarily condense the scrubbed syngas, and condense heavy components with higher boiling points in the syngas to obtain a first condensate. The first stage condenser 202 may condense the syngas using circulating water as a coolant. The uncondensed gases in the synthesis gas can enter the secondary condenser 203 through the second conveying line 205 to be further condensed.

The temperature of the cooling liquid in the secondary condenser 203 is lower than that of the cooling liquid in the primary condenser 202, and the cooling liquid can be used for deeply condensing the synthesis gas and condensing the light components with lower boiling points in the synthesis gas to obtain a second condensate, wherein the second condensate mainly comprises methyl chloride and other monomers with higher boiling points. The secondary condenser 203 may condense the syngas using circulating chilled brine as a coolant. The secondary condenser 203 may also have a second outlet for outputting the still uncondensed gas of the synthesis gas to a subsequent process.

The fifth transfer line 208 may be used to transfer the condensate to the scrub column for reflux as a scrub liquid for scrubbing the syngas to be scrubbed. In order to facilitate the transfer of the condensate to the scrubber, in an embodiment the apparatus 20 further comprises a first transfer pump 211, as shown in fig. 3, the first transfer pump 211 being arranged at a third position C of the fifth transfer line 208. The first transfer pump 211 may provide a transfer power so that the condensate may be smoothly transferred to the washing tower 201.

The first valve 209 and the second valve 210 may be proportional valves. By providing the first valve 209 and the second valve 210 on the third delivery line 206 and the fourth delivery line 207, respectively, the energy consumption of the washing process can be controlled by regulating the first valve 209 and the second valve 210. For example, the first valve 209 is controlled to be opened, the second valve 210 is controlled to be closed, and only the first condensate is delivered to the scrubber 201 for reflux, so that light components entering the scrubber 201 are very few, further the phenomenon of vaporization of the scrubber liquid is reduced, the amount of gas to be condensed by the condenser is reduced, and the energy consumption of the scrubbing process can be reduced.

It can be understood that, by the apparatus 20 for dedusting gas provided in the embodiment of the present application, the first valve 209 and the second valve 210 are respectively disposed on the third conveying pipeline 206 and the fourth conveying pipeline 207, and the first valve 209 can be controlled to be opened and the second valve 210 can be controlled to be closed, so that only the first condensate is conveyed to the scrubber 201 for reflux, the amount of light components entering the scrubber 201 is reduced, and thus the energy consumption of the scrubbing process can be reduced.

In addition, considering that the amount of the syngas to be scrubbed introduced into the scrubber 201 may be varied, if the amount of the syngas is increased, only the first condensate is transferred to the scrubber 201 to be refluxed as the scrubbing liquid, and there may be a case where the scrubbing liquid is less and a good dust removal effect cannot be achieved. Based on the apparatus 20 provided in the foregoing embodiment of the present application, in the case that the first valve 209 is opened, the second valve 210 may be further opened to a preset opening degree, so that a portion of the second condensate is delivered to the washing tower 201 for refluxing, so as to replenish the washing liquid; the preset opening degree can be adjusted according to actual needs. It can be seen that the device 20 for removing dust from gas provided by the embodiment of the application can give consideration to both energy consumption and dust removal effect, that is, can achieve better dust removal effect while saving energy consumption.

As previously mentioned, the amount of syngas to be scrubbed passing to the scrubber 201 may be varied, and if the amount of syngas is decreased, the opening of the first valve 209 may be decreased, and only a portion of the first condensate may be delivered to the scrubber 201. Then, the first condensate which is not supplied to the scrubber 201 is gradually increased, cannot be discharged, and may be retained in the first-stage condenser 202, which may affect the normal operation of the first-stage condenser 202. Accordingly, in one embodiment, the apparatus 20 for dedusting gas provided by the present application further includes a first storage tank 212; as shown in fig. 4, the first storage tank 212 has a first inlet and a first outlet; the third transfer line 206 includes a first transfer sub-line 2061 and a second transfer sub-line 2062; the second outlet of the primary condenser 202 is communicated with the first inlet of the first storage tank 212 through the first delivery sub-pipe 2061, and the first outlet of the first storage tank 212 is communicated with the inlet of the fifth delivery pipe 208 through the second delivery sub-pipe 2062.

The first storage tank 212 may be used to temporarily store the first condensate. On the other hand, the first condensate, which may be mixed with gas, is first transferred to the first storage tank 212 and is left standing for a period of time, so that the gas and liquid phases therein are separated, and then the first condensate in the first storage tank 212 is transferred to the washing tower 201, so that the gas in the first condensate can be prevented from entering the washing tower, and the energy consumption in the washing process can be further reduced.

It can be understood that, by the above scheme, the first storage tank 212 is arranged to temporarily store the first condensate, so that the first condensate which is not conveyed to the washing tower 201 can be prevented from being retained in the first-stage condenser 202, and the normal operation of the first-stage condenser 202 can be ensured; on the other hand, the energy consumption of the washing process can be further reduced.

In the embodiment of the present application, if the second condensate is not delivered to the washing tower 201 or only a small amount of the second condensate is delivered to the washing tower 201, the second condensate is retained in the secondary condenser 203 as the second condensate increases, which may affect the normal operation of the secondary condenser 203. Therefore, in one embodiment, the apparatus 20 for dedusting gas provided in the embodiment of the present application further includes a second storage tank 213; as shown in fig. 4, the second storage tank 213 has a first inlet and a first outlet; the fourth conveying line 207 includes a third conveying sub-line 2071 and a fourth conveying sub-line 2072; the first outlet of the secondary condenser 203 is communicated with the first inlet of the second storage tank 213 through the third transport sub-pipe 2071, and the first outlet of the second storage tank 213 is communicated with the inlet of the fifth transport pipe 208 through the fourth transport sub-pipe 2072.

Wherein the second storage tank 213 may be used for temporary storage of the second condensate. On the other hand, the second condensate may be mixed with gas, the second condensate is first transferred to the second storage tank 213 and left standing for a period of time, so that the gas and liquid phases therein are separated, and when a part of the second condensate needs to be transferred to the washing tower 201, the second condensate is transferred from the second storage tank 213 to the washing tower 201, so that the gas in the second condensate can be prevented from entering the washing tower, and the energy consumption in the washing process can be further reduced.

It can be understood that, by the above scheme, the second storage tank 213 is arranged to temporarily store the second condensate, so that the second condensate can be prevented from being retained in the secondary condenser 203, and the normal operation of the secondary condenser 203 can be ensured; on the other hand, the energy consumption of the washing process can be further reduced.

In practical applications, when the amount of syngas is small, the amount of scrubbing liquid can be reduced not only by reducing the opening of the first valve 209, but also by feeding only part of the first condensate to the scrubbing tower 201; the amount of washing liquid can also be reduced in other ways. For example, in an embodiment, the apparatus 20 for dedusting gas provided in the embodiment of the present application further includes a sixth conveying pipeline 214, as shown in fig. 5, the second storage tank 213 further has a second inlet; an inlet of the sixth delivery line 214 communicates with the fourth position D of the fifth delivery line 208, and an outlet of the sixth delivery line 214 communicates with a second inlet of the second storage tank 213.

Wherein the fourth position D may be located downstream of the third position C. The terms "upstream" and "downstream" as used in the embodiments of the present application are relative to the direction of flow of material in a pipeline.

By providing the branch sixth transfer line 214 on the fifth transfer line 208 to communicate with the second storage tank 213, when the amount of the syngas is small, a portion of the first condensate is transferred from the sixth transfer line 214 to the second storage tank 213, and the amount of the scrubbing liquid can be reduced.

On the other hand, the second condensate in the second storage tank 213 and the condensate in the first storage tank 212 that is not transferred to the washing tower 201 are generally transferred to a subsequent processing device for processing, for example, to a device capable of separating and recovering components in the condensate, in the above embodiment of the present application, the branch sixth transfer pipe 214 is disposed to communicate with the second storage tank 213, when the condensate in the first storage tank 212 that is not transferred to the washing tower 201 needs to be transferred to the subsequent processing device, the condensate can be transferred to the second storage tank 213 and then transferred to the subsequent processing device together with the condensate in the second storage tank 213, thereby avoiding additional transfer pipes between the first storage tank 212 and the subsequent processing device, and saving cost. Correspondingly, a first target position on the fifth feed line 208 downstream of the fourth position D can then be provided with a first target valve, which can be a proportional valve, by means of which the partial feed of the first condensate to the second storage tank 213, or the complete feed to the second storage tank 213, can be controlled.

In order to further adjust and control the amount of the first condensate introduced into the second storage tank 213 according to actual conditions when the sixth delivery pipe 214 is provided to communicate with the second storage tank 213 for reducing the amount of the washing liquid, in an embodiment, the apparatus 20 for removing dust from the gas further includes a third valve 215; as shown in fig. 5, the third valve 215 is disposed at a fifth position E of the sixth delivery line 214.

It will be appreciated that by providing the third valve 215 on the sixth delivery line 214, the amount of first condensate passing to the second reservoir 213 can be regulated as appropriate.

In one embodiment, the apparatus 20 for dedusting gas provided in the embodiment of the present application further includes a seventh conveying pipeline 216, a separating device 217 and a second conveying pump 218, as shown in fig. 6, where the separating device 217 has an inlet, and the second storage tank 213 further has a second outlet; a second outlet of the second storage tank 213 communicates with an inlet of the separation device 217 through the seventh transfer line 216; the second delivery pump 218 is disposed at a sixth position F of the seventh delivery line 216.

The separation device 217 may be a device for separating the components in the condensate to obtain various products, for example, the separation device 217 may be a crude monomer column for separating methyl chloride and other monomers in the second condensate.

It is understood that, by the above-mentioned solution, the seventh conveying pipe 216 and the second conveying pump 218 are provided, and the second condensate and the first condensate returned to the second storage tank 213 from the sixth conveying pipe 214 can be conveyed to the separation device 217 for subsequent separation treatment to obtain various products.

In practical applications, in order to avoid the situation that the first condensate cannot flow back to the washing tower 201 due to the failure of the first delivery pump 211, and thus the washing effect is affected, in one embodiment, the apparatus 20 for removing dust from gas provided by the embodiment of the present application further includes an eighth delivery pipe 219 and a fourth valve 220; as shown in fig. 6, the inlet of the eighth delivery pipe 219 communicates with the seventh position G of the seventh delivery pipe 216, and the outlet of the eighth delivery pipe 219 communicates with the eighth position H of the fifth delivery pipe 208; the fourth valve 220 is arranged in a ninth position I of the eighth feed line 219.

Wherein the seventh position G may be downstream of the sixth position F, the eighth position H may be downstream of the fourth position D, and the fourth valve 220 may be a proportional valve.

It can be understood that, by the above-mentioned solution, the eighth delivery pipe 219 is arranged to communicate the seventh delivery pipe 216 with the fifth delivery pipe 208, and the fourth valve 220 is arranged on the eighth delivery pipe 219, when the first delivery pump 211 fails, so that the first condensate cannot flow back to the scrubber 201, the fourth valve 220 can be opened to deliver the condensate in the second storage tank 213 to the scrubber for flowing back as the scrubbing liquid, so as to ensure the scrubbing effect of the syngas in the scrubber 201 as much as possible. In addition, a valve may be disposed on the seventh conveying line 216 at a position downstream of the seventh position G, and the valve and the fourth valve 220 are controlled to be opened, so that a part of the condensate pumped out from the second conveying pump 218 may flow back to the washing tower 201, and a part of the condensate may be conveyed to the separating device 217, and the separation step may be performed smoothly under the condition that the washing tower 201 is ensured to work normally; the valve is controlled to be closed, and the fourth valve 220 is controlled to be opened, so that the condensate pumped out from the second delivery pump 218 can completely flow back to the washing tower 201, and the method is suitable for the condition that the washing tower 201 needs a large amount of washing liquid; by controlling the valve to open and the fourth valve 220 to close, the condensate pumped out from the second transfer pump 218 can be completely transferred to the separation device 217, which can be applied to the case of failure relief of the first transfer pump 211.

When the first delivery pump 211 fails, the first condensate has not been delivered to the scrubber 201, resulting in a retention of the first condensate 201, for example in the first storage tank 212, possibly resulting in an overflow of the first condensate in the first storage tank 212 as the first condensate increases. Therefore, in one embodiment, the apparatus 20 for dedusting gas provided in the embodiment of the present application further includes a ninth conveying pipeline 221 and a fifth valve 222, and the second storage tank 213 further has a third inlet; as shown in fig. 7, the inlet of the ninth transfer pipe 221 is communicated with the tenth position J of the first transfer sub-pipe 2061, and the outlet of the ninth transfer pipe 221 is communicated with the third inlet of the second storage tank 213; the fifth valve 222 is disposed at an eleventh position K of the ninth delivery pipe 221.

It can be understood that, by the above-mentioned solution, the ninth delivery pipe 221 is provided to communicate the first delivery sub-pipe 2061 with the second storage tank 213, and the fifth valve 222 is provided on the ninth delivery pipe 221, when the first delivery pump 211 fails, so that the first condensate cannot flow back to the washing tower 201, the fifth valve 222 can be opened to deliver at least a part of the first condensate to the second storage tank 213, thereby alleviating the overflow condition in the first storage tank 212. In practice, a second target valve may be provided at a second target position of the first delivery sub-line 2061, which is downstream of the tenth position J, and the delivery of all the first condensate to the second storage tank 213 may be controlled by closing the second target valve.

In order to further improve the dust removal effect of the syngas, in one embodiment, the apparatus 20 for removing dust from gas provided by the embodiment of the present application further includes a cyclone 223, as shown in fig. 8, the scrubber 201 further has a second inlet; the outlet of the cyclone 223 communicates with the second inlet of the scrubber 201.

Wherein the cyclone 223 further has an inlet for passing the synthesis gas obtained from the fluidized bed reaction into the cyclone 223. The cyclone 223 can primarily separate the gas and dust in the syngas, i.e. primarily remove the dust in the syngas, and then introduce the gas obtained by the primary dust removal into the scrubber 201 through the outlet and the second inlet of the scrubber 201 for scrubbing and dust removal.

It can be understood that, with the above-mentioned solution, the cyclone 223 is arranged before the scrubber 201, and the syngas is dedusted by the cyclone 223 and the scrubber 201, so that the dedusting effect can be improved.

In practical applications, the apparatus 20 for removing dust from a gas provided in the embodiment of the present application may further include a re-evaporator, the scrubber 201 may further have a second outlet and a third inlet, the second outlet and the third outlet are disposed at the bottom of the scrubber 201, dust and scrubbing liquid may enter the re-evaporator from the second outlet, in the re-evaporator, the scrubbing liquid may be changed into a gas phase by heating, and separated from the dust, and the gas phase enters the scrubber from the third inlet, so that the improvement of the product recovery rate may be achieved.

Based on the apparatus 20 for removing dust from gas provided in the above embodiments of the present application, the embodiments of the present application also provide a more specific apparatus 30 for removing dust from gas, and it should be understood that the apparatus 30 is only an example and does not represent a limitation to the apparatus for removing dust from gas provided in the embodiments of the present application. As shown in fig. 9, the apparatus 30 includes a fluidized bed 301, a cyclone 302, a scrubber 303, a re-evaporator 304, a first-stage condenser 305, a second-stage condenser 306, a first storage tank 307, a second storage tank 308, a separation device 309, a first transfer pump 310, a second transfer pump 311, a first transfer line 312, a second transfer line 313, a third transfer line 314, a fourth transfer line 315, a fifth transfer line 316, a sixth transfer line 317, a seventh transfer line 318, an eighth transfer line 319, a ninth transfer line 320, a tenth transfer line 321, an eleventh transfer line 322, a first valve 323, a second valve 324, a third valve 325, a fourth valve 326, a fifth valve 327, a sixth valve 328, and a seventh valve 329.

The fluidized bed 301 is used for performing a reaction for synthesizing methylchlorosilane, and synthesis gas containing methylchlorosilane and dust is obtained from the fluidized bed 301. From the fluidized bed 301, the syngas may enter a cyclone 302 for preliminary dust removal.

The scrub column 303 has a first inlet, a second inlet, a third inlet, a first outlet, and a second outlet; the gas obtained by the preliminary dust removal by the cyclone 302 enters the scrubber 303 through the second inlet for scrubbing. The resulting dust and scrubbing liquid after scrubbing flows out of the second outlet and enters the re-evaporator 305, and the gas resulting from evaporation by the re-evaporator 305 enters the scrubbing tower 303 through the third inlet.

The syngas after being scrubbed and dedusted by the scrubber 303 enters the first-stage condenser 305 for condensation from the first outlet through the first conveying pipeline 312. The primary condenser 305 has a first outlet from which uncondensed gases enter the secondary condenser 306 via a second transfer line 313 for condensation, and the secondary condenser 306 has a first outlet and a second outlet.

The first condensate condensed by the primary condenser 305 flows out from the second outlet of the primary condenser 305 and is transferred to the first storage tank 307 through the third transfer pipe 314, the outlet of the first storage tank 307 is communicated with the inlet of the fifth transfer pipe 316 through the fourth transfer pipe 315, and the outlet of the fifth transfer pipe 316 is communicated with the first inlet of the washing tower 303. An inlet of the sixth transfer line 317 is communicated with the fifth transfer line 316, and an outlet of the sixth transfer line 317 is communicated with the second storage tank 308.

The second condensate obtained in the secondary condenser 306 flows out of the first outlet of the secondary condenser 306 and is transferred to the second storage tank 308 via the seventh transfer line 318, and the second storage tank 308 is communicated with the inlet of the fifth transfer line 316 via the eighth transfer line 319. The second storage tank 308 communicates with the separation device 309 through a ninth delivery pipe 320. An inlet of the tenth transfer line 321 communicates with the ninth transfer line 320, and an outlet of the tenth transfer line 321 communicates with the fifth transfer line 316. An inlet of the eleventh delivery pipe 322 communicates with the third delivery pipe 314, and an outlet of the eleventh delivery pipe 322 communicates with the second storage tank 308.

The first transfer pump 310 is provided on the fifth transfer line 316, and the second transfer pump 311 is provided on the ninth transfer line 320.

The first valve 323 is arranged on the fourth supply line 315, the second valve 324 on the eighth supply line 319, the third valve 325 on the fifth supply line 316, the fourth valve 326 on the sixth supply line 317, the fifth valve 327 on the eighth supply line 319, the sixth valve 328 on the tenth supply line 321 and the seventh valve 329 on the eleventh supply line 322.

The specific locations of the delivery pumps and valves can be seen in figure 9 and the previous embodiment. It should be understood that only some of the critical valves are shown in fig. 9, and in practical applications, other valves may be provided according to the requirement, for example, a valve may be provided on the ninth delivery pipe 320 to control the amount of the condensate delivered to the separation device 309.

It can be understood that, by the device 30 for dedusting gas provided by the embodiment of the present application, the first valve 323 can be controlled to be opened and the second valve 324 can be controlled to be closed, so that only the first condensate is delivered to the washing tower 303 for reflux, the amount of light components entering the washing tower 303 is reduced, and the energy consumption of the washing process can be reduced.

Based on the device for removing dust from gas provided by the embodiment of the present application, the embodiment of the present application further provides a method for removing dust from gas, as shown in fig. 10, the method includes the following steps:

step 401, introducing the gas into a washing tower to obtain a first gas after dust removal.

The gas passed to the scrubber may be obtained from a fluidised bed or from a cyclone.

Step 402, introducing the first gas into a primary condenser for condensation to obtain a first condensate and a second gas; and introducing the second gas into a secondary condenser for condensation to obtain second condensate.

Wherein the temperature of the cooling liquid in the first-stage condenser is higher than the temperature of the cooling liquid in the second-stage condenser. The first-stage condenser adopts circulating water with the temperature of 20-40 ℃ as cooling liquid, and the second-stage condenser adopts frozen salt water with the temperature of-20-10 ℃ as cooling liquid.

And 403, conveying the first condensate to the washing tower for reflux, and conveying the second condensate to a separation device for treatment.

It can be understood that, by the method for dedusting gas provided by the embodiment of the application, only the first condensate can be conveyed to the washing tower for reflux, so that the amount of light components entering the washing tower is reduced, and the energy consumption of the washing process can be reduced.

When the amount of the synthesis gas in the washing tower is increased, only the first condensate is conveyed to the washing tower to be refluxed as the washing liquid, the washing liquid is less, and a good dust removal effect cannot be achieved. At this time, a part of the second condensate may be controlled to be refluxed to the washing column. The structure of the device related to this transportation method can refer to the foregoing embodiment and fig. 2, and will not be described herein again.

When the first delivery pump fails, so that the first condensate cannot be refluxed to the washing tower, part of the second condensate can be controlled to be delivered to the washing tower for refluxing. The portion of the second condensate is the condensate to be delivered to the separation device. The structure of the device related to this transportation method can refer to the foregoing embodiment and fig. 7, and will not be described herein again.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The equipment for dedusting gas is characterized by comprising a washing tower, a primary condenser, a secondary condenser, a first conveying pipeline, a second conveying pipeline, a third conveying pipeline, a fourth conveying pipeline, a fifth conveying pipeline, a first valve and a second valve;

2. An apparatus for dedusting a gas as in claim 1 further comprising a first storage tank;

3. An apparatus for dedusting a gas as in claim 2 further comprising a second storage tank;

4. An apparatus for dedusting a gas as set forth in claim 3 further comprising a sixth feed line, the second storage tank further having a second inlet;

5. An apparatus for dedusting a gas as in claim 4, further comprising a third valve;

the third valve is disposed in a fifth position of the sixth delivery line.

6. An apparatus for dedusting a gas as in claim 4 further comprising a seventh transport line, a separation device, and a second transport pump,

7. An apparatus for dedusting a gas as in claim 6 further comprising an eighth feed line and a fourth valve;

the fourth valve is disposed at a ninth position of the eighth delivery pipe.

8. An apparatus for dedusting a gas as set forth in claim 7 further comprising a ninth feed line and a fifth valve, wherein the second storage tank further has a third inlet;

the fifth valve is disposed at an eleventh position of the ninth delivery pipe.

9. A method for dedusting a gas with an apparatus according to any of claims 1-8, characterized in that the method comprises:

introducing gas into a washing tower to obtain first gas after dust removal;

10. The method of claim 9, wherein the first condensate is delivered to the scrub column for reflux by a first delivery pump and the second condensate is delivered to a separation device by a second delivery pump, the method further comprising, in the event of a failure of the first delivery pump: