Gypsum dehydration device for wet flue gas desulfurization

Abstract

The utility model discloses a gypsum dehydration device for wet flue gas desulfurization, which comprises a vacuum belt dehydrator and a belt which is arranged in the vacuum belt dehydrator and is used for conveying filter materials, support rollers which are contacted with each other are arranged below the belt, a mounting table is arranged above the belt, and a cleaning mechanism for cleaning impurities on the surface of the belt is arranged in the mounting table. A hydrocyclone is arranged on one side of the mounting table, a discharging pipe is mounted at the top of the hydrocyclone, a feeding channel is mounted on one side of the hydrocyclone, and the feeding channel is designed to be gradually expanded from an inlet to an outlet; the feeding pipe is supported through the arranged supporting rollers, dirt and impurities on the surface of the feeding pipe at the inclined position are washed away in cooperation with the cleaning mechanism, and therefore the follow-up dewatering efficiency is improved, and the loss of energy consumption is reduced; gypsum slurry forms more stable and stronger rotational flow in the hydrocyclone, and the solid-liquid separation effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flue gas desulfurization, specifically to a gypsum dewatering device for wet flue gas desulfurization. BACKGROUND

[0002] With the acceleration of global industrialization process, the combustion of a large amount of fossil fuels leads to serious air pollution problems, among which sulfur dioxide (SO2) is one of the main pollutants, so wet flue gas desulfurization is particularly important. The basic principle of wet flue gas desulfurization process is to use the slurry of alkaline absorbent (such as limestone, lime, etc.) to react with SO2 in flue gas to generate calcium sulfite (CaSO3), which is further oxidized to calcium sulfate (CaSO4), i.e. gypsum. In the desulfurization process, a large amount of gypsum slurry will be produced, and its water content is usually as high as 80%-90%. If these gypsum slurries are not effectively dewatered, they not only cannot meet the subsequent transportation, storage and comprehensive utilization requirements, but also will occupy a large amount of storage space and increase the processing cost. For example, in a large thermal power plant, the amount of gypsum slurry produced by the wet flue gas desulfurization system every day can reach hundreds of cubic meters, which will seriously affect the normal operation of the power plant if it cannot be dewatered in time. Therefore, efficient dewatering of the gypsum produced in the wet flue gas desulfurization process is an important link in the whole flue gas desulfurization process.

[0003] At present, the traditional gypsum dewatering devices such as hydrocyclone and vacuum belt dewatering machine have many limitations, with low dewatering efficiency, high energy consumption, easy blockage and wear, and the quality of the centrifuged gypsum is not ideal, and the impact force of the material entering the hydrocyclone is also unstable, resulting in the formation of centrifugal force being high and low, which affects the overall effect and economy of the flue gas desulfurization process.

[0004] Therefore, a gypsum dewatering device for wet flue gas desulfurization is proposed. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a gypsum dewatering device for wet flue gas desulfurization to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A gypsum dewatering device for wet flue gas desulfurization, including vacuum belt dewaterer and its inside for conveying filter material's belt, the below of belt is equipped with the support roller of contact, the above of belt is equipped with installation platform, the inside of installation platform is equipped with the cleaning mechanism of cleaning belt surface impurity, one side of installation platform is equipped with hydraulic cyclone, the top of hydraulic cyclone is installed with discharge pipe, one side of hydraulic cyclone is installed with feed channel, the inlet to the outlet of feed channel uses gradually expanding form design, the inside of hydraulic cyclone is provided with helical flow guide groove, the pitch of helical flow guide groove is gradually reduced from top to bottom setting, one side of hydraulic cyclone is equipped with vacuum assembly.

[0007] Preferably, the support roller, the installation platform and one side of the hydraulic cyclone are installed on the vacuum belt dewaterer, and a flow valve is installed at the lower end of the hydraulic cyclone.

[0008] Preferably, the cleaning mechanism includes a first spray tank, the first spray tank is installed on the installation platform, a conveying pipe is installed on one side of the first spray tank, a control valve is installed at the other end of the conveying pipe, a feeding pipe is installed at the lower end of the control valve, a pump is installed at the lower end of the feeding pipe, and a liquid storage tank is installed at the input end of the pump.

[0009] Preferably, the vacuum assembly includes an upper vacuum tank, the upper vacuum tank is installed on the vacuum belt dewaterer, a lower vacuum tank is installed at the bottom of the upper vacuum tank, a plurality of partitions are installed in the lower vacuum tank, and a blowdown pipe is installed at the bottom of the lower vacuum tank.

[0010] Preferably, the feeding pipe includes a base body, two layers of polyester fiber nets are arranged at the top of the base body, and a nano-level microporous membrane is arranged between the two polyester fiber nets.

[0011] Preferably, a splash-proof cover is installed at the lower end of the flow valve, and the splash-proof cover is made of stainless steel.

[0012] Preferably, a connecting pipe is installed at the upper end of the control valve, a second spray tank is installed at the upper end of the connecting pipe, and the second spray tank is in through connection with the inside of the feed channel.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The utility model discloses a material falls into the feeding pipe before, through the support roller who sets up supports the feeding pipe, and the dirt and impurity of the surface of feeding pipe at the inclined place are washed out to the cooperation cleaning mechanism, thereby improving the dehydration efficiency, reduce the loss of energy consumption of subsequent, simultaneously through the spiral flow guide groove who has set up in the inside of the hydrocyclone, makes the more stable, more intense spiral flow of gypsum slurry in the cyclone, improves the solid -liquid separation effect, improves the gypsum quality.

[0015] 2. The utility model discloses for further prevent the vacuum belt dehydration machine from blocking and wearing in the process of separating gypsum, through the control valve on the cleaning mechanism controls the delivery of cleaning liquid, through the cleaning liquid is delivered to the inside of second spray tank through the delivery pipe, and is sprayed to the inner wall on the feed passage, the dirt and blockages on the inner wall of feed passage after shutdown are cleaned, guarantee the normal operation of subsequent equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the main structure schematic diagram of the utility model;

[0017] Figure 2 It is the cleaning mechanism structure schematic diagram of the utility model;

[0018] Figure 3 It is the section structure schematic diagram of the utility model;

[0019] Figure 4 It is the internal structure schematic diagram of the feeding pipe of the utility model.

[0020] In the drawing: 1, vacuum belt dehydration machine;2, belt;3, support roller;4, installation platform;5, first spray tank;6, delivery pipe;7, control valve;8, feeding pipe;81, base material main part;82, polyester fiber net;83, nanometer level microporous membrane;9, pump;10, liquid storage tank;11, connecting pipe;12, second spray tank;13, feed passage;14, hydrocyclone;15, discharge pipe;16, flow valve;17, spiral flow guide groove;19, upper vacuum box;20, lower vacuum box;21, partition;22, blowdown pipe;23, splash guard. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0022] Embodiment 1: please refer to Figures 1-4The utility model provides a technical scheme: a gypsum dewatering device for wet flue gas desulfurization, including vacuum belt dewaterer 1 and its inside for conveying filter material's belt 2, is equipped with the support roller 3 of contact below the belt 2, is equipped with the installation platform 4 above the belt 2, the inside of installation platform 4 is equipped with the cleaning mechanism of cleaning belt 2 surface impurity, one side of installation platform 4 is equipped with hydraulic cyclone 14, the top of hydraulic cyclone 14 is installed and is equipped with the discharge pipe 15, one side of hydraulic cyclone 14 is installed and is equipped with the feed channel 13, the inlet to the outlet of feed channel 13 uses gradually expanding form design, the inside of hydraulic cyclone 14 is set up and is equipped with spiral flow guide groove 17, and the pitch of spiral flow guide groove 17 gradually reduces from top to bottom setting, one side of hydraulic cyclone 14 is equipped with vacuum assembly, and the support roller 3 of setting is supported and is raised to the feeding pipe 8, and the dirt and impurity on the surface of feeding pipe 8 at the inclined place are washed out in cooperation with the cleaning mechanism, thereby improving subsequent dewatering efficiency, reduce the loss of energy consumption, and the spiral flow guide groove 17 of setting in the inside of hydraulic cyclone 14 makes the more stable, more intense cyclone of gypsum slurry in cyclone, improves solid-liquid separation effect.

[0023] As Figure 1 And 2 Shown, support roller 3 and installation platform 4 and one side of hydraulic cyclone 14 are all installed on vacuum belt dewaterer 1, and the lower end outlet of hydraulic cyclone 14 is installed with flow valve 16, and flow valve 16 is used for controlling the concentration of underflow gypsum, and the cleaning mechanism includes first spray tank 5, and first spray tank 5 is installed on installation platform 4, and one side of first spray tank 5 is installed with conveying pipe 6, and the other end of conveying pipe 6 is installed with control valve 7, and the lower end of control valve 7 is installed with feeding pipe 8, and the lower end of feeding pipe 8 is installed with pump 9, and the input end of pump 9 is installed with liquid storage tank 10, and the dirt on belt 2 is cleaned in advance through the cleaning mechanism, so as to subsequent filtration operation.

[0024] As Figure 1 And 3As shown, the vacuum assembly includes an upper vacuum box 19 mounted on the vacuum belt dewaterer 1, a lower vacuum box 20 mounted at the bottom of the upper vacuum box 19, a plurality of partitions 21 mounted inside the lower vacuum box 20, and a blowdown pipe 22 mounted at the bottom of the lower vacuum box 20. The upper vacuum box 19 above the vacuum belt dewaterer 1 and the lower vacuum box 20 below the vacuum belt dewaterer 1 jointly form a vacuum environment. The upper vacuum box 19 and the lower vacuum box 20 are tightly connected through a sealing device to ensure the vacuum degree. The lower vacuum box 20 is divided into a plurality of independent vacuum chambers by the plurality of partitions 21 installed inside the lower vacuum box 20. The vacuum degree of each chamber can be adjusted individually. A vacuum pump (not shown in detail) is connected to the lower vacuum box 20 through a vacuum pipe, which is a prior art. The air in the vacuum box is pumped out to form a vacuum. When the gypsum material on the belt 2 passes above the vacuum box, the water in the gypsum material penetrates through the belt 2 into the vacuum box under the action of the vacuum degree, and is finally discharged through the blowdown pipe 22. The blowdown pipe 22 is connected to a sewage treatment system for centralized treatment.

[0025] As shown in Figure 3 and 4 The feeding pipe 8 includes a base body 81, and two layers of polyester fiber nets 82 are arranged at the top of the base body 81. A nanoscale microporous membrane 83 is arranged between the two layers of polyester fiber nets 82. The two layers of high-strength polyester fiber nets 82 serve as support layers, and the nanoscale microporous membrane 83 sandwiched therebetween serves as a filter layer. The nanoscale microporous membrane 83 can provide sufficient strength support and effectively prevent gypsum particles from passing through, thereby improving the filtering precision.

[0026] The flow valve 16 is provided with a splash-proof cover 23 at the lower end. The splash-proof cover 23 is made of stainless steel. The splash-proof cover 23 at the lower end of the flow valve 16 is made of stainless steel and has a conical or hemispherical shape. The splash-proof cover 23 covers the flow valve 16 below. When the bottom flow gypsum is discharged from the flow valve 16, the splash-proof cover 23 can effectively prevent the gypsum particles from splashing, thereby avoiding pollution of the surrounding environment and loss of the material.

[0027] As shown in Figure 1 and 2As shown, the upper end of the control valve 7 is provided with a connecting pipe 11, the upper end of the connecting pipe 11 is provided with a second spraying box 12, the second spraying box 12 is connected with the inside of the feeding channel 13, when the equipment needs to be shut down for maintenance or is not operated for a long time and then is started again, in order to prevent the gypsum particles remaining on the inner wall of the feeding channel 13 from drying to form dirt and blockage to affect the subsequent feeding, the control valve 7 in the cleaning mechanism is started, after the control valve 7 is opened, the cleaning liquid in the liquid storage tank 10 is conveyed to the second spraying box 12 through the feeding pipe 8, the control valve 7 and the connecting pipe 11 under the action of the pump 9, a plurality of nozzles are arranged in the second spraying box 12, the nozzles uniformly spray the cleaning liquid to the inner wall of the feeding channel 13, the cleaning liquid can be water or water solution added with a proper amount of cleaning agent, which can effectively flush away the dirt and blockage on the inner wall, and the sewage after cleaning is discharged through the drain at the bottom of the feeding channel 13.

[0028] The working principle is that: in actual use, the gypsum slurry generated in the wet flue gas desulfurization process first enters the feeding channel 13, the feeding channel 13 is designed in a gradually expanding form from the inlet to the outlet, and the lower flow rate is beneficial to the formation of stable rotational flow in the hydrocyclone 14, the gypsum slurry is conveyed to the hydrocyclone 14, the gypsum slurry after the pretreatment of the feeding channel 13 enters the hydrocyclone 14 under the action of gravity, starts to rotate under the action of the spiral flow guide groove 17, the pitch of the spiral flow guide groove 17 gradually decreases from top to bottom, due to the action of centrifugal force, the heavier gypsum solid particles are thrown to the cylinder wall of the hydrocyclone 14 and move downward along the cylinder wall, and finally are discharged from the lower end outlet, while the lighter liquid gathers to the central area to form an upward flow and is discharged from the discharge pipe 15 at the top;

[0029] The flow valve 16 installed at the lower end outlet of the hydrocyclone 14 is used for controlling the concentration of the underflow gypsum, in the running process, the concentration of the underflow gypsum is monitored in real time through the concentration sensor installed at the underflow outlet, the concentration data is transmitted to the control system, the opening of the flow valve 16 is automatically adjusted, at the same time, the supporting roller 3 supports the belt 2 to keep a certain tension and flatness, so that the belt 2 does not deviate or relax in the running process, the cleaning liquid in the liquid storage tank 10 in the cleaning mechanism is conveyed to the first spraying box 5 through the conveying pipe 6 under the action of the pump 9, the nozzles in the first spraying box 5 uniformly spray the cleaning liquid on the surface of the belt 2, the cleaning liquid can be water or water solution added with a small amount of surfactant, which can effectively flush away the gypsum particles on the surface of the belt 2 and keep the micropores of the belt 2 unblocked, at the same time, the cleaning liquid can also play a certain lubricating effect, reduces the running resistance of the belt 2 and improves the dehydration efficiency.

[0030] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gypsum dewatering device for wet flue gas desulfurization, comprising a vacuum belt dewaterer (1) and a belt (2) inside it for conveying filtered material, characterized in that, The lower side of the belt (2) is provided with a supporting roller (3) in contact, the upper side of the belt (2) is provided with a mounting table (4), the inside of the mounting table (4) is provided with a cleaning mechanism for cleaning the impurities on the surface of the belt (2), one side of the mounting table (4) is provided with a hydrocyclone (14), the top of the hydrocyclone (14) is provided with a discharge pipe (15), one side of the hydrocyclone (14) is provided with a feeding channel (13), the inlet to the outlet of the feeding channel (13) is designed in a gradually expanding form, which gradually reduces the flow rate of the gypsum slurry when it enters, reduces the impact of the slurry on the inner wall of the feeding channel (13), avoids the equipment wear and uneven distribution of gypsum particles caused by unstable impact force, the inside of the hydrocyclone (14) is provided with a spiral flow guide groove (17), the pitch of the spiral flow guide groove (17) gradually decreases from top to bottom, one side of the hydrocyclone (14) is provided with a vacuum pumping assembly.

2. The gypsum dewatering device for wet flue gas desulfurization according to claim 1, characterized in that: The supporting roller (3), the mounting table (4) and one side of the hydrocyclone (14) are all installed on the vacuum belt dewatering machine (1), and the lower end outlet of the hydrocyclone (14) is provided with a flow valve (16).

3. The gypsum dewatering device for wet flue gas desulfurization according to claim 1, characterized in that: The cleaning mechanism comprises a first spray tank (5), the first spray tank (5) is installed on the mounting table (4), one side of the first spray tank (5) is provided with a conveying pipe (6), the other end of the conveying pipe (6) is provided with a control valve (7), the lower end of the control valve (7) is provided with a feeding pipe (8), the lower end of the feeding pipe (8) is provided with a pump (9), and the input end of the pump (9) is provided with a liquid storage tank (10).

4. The gypsum dewatering device for wet flue gas desulfurization according to claim 1, characterized in that: The vacuum pumping assembly comprises an upper vacuum tank (19), the upper vacuum tank (19) is installed on the vacuum belt dewatering machine (1), the bottom of the upper vacuum tank (19) is provided with a lower vacuum tank (20), a plurality of partition plates (21) are installed in the lower vacuum tank (20), and the bottom of the lower vacuum tank (20) is provided with a blowdown pipe (22).

5. The gypsum dewatering device for wet flue gas desulfurization according to claim 3, characterized in that: The feeding pipe (8) comprises a base body (81), the top of the base body (81) is provided with two layers of polyester fiber nets (82), and a nano-level microporous membrane (83) is arranged between the two polyester fiber nets (82).

6. The gypsum dewatering device for wet flue gas desulfurization according to claim 2, characterized in that: The lower end of the flow valve (16) is provided with a splash guard (23), and the splash guard (23) is made of stainless steel.

7. The gypsum dewatering device for wet flue gas desulfurization according to claim 3, characterized in that: The upper end of the control valve (7) is provided with a connecting pipe (11), the upper end of the connecting pipe (11) is provided with a second spray tank (12), and the second spray tank (12) is in through connection with the inside of the feeding channel (13).

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