Gypsum slurry dehydration system

Abstract

The utility model discloses a gypsum slurry dehydration system which comprises a gypsum slurry discharge pump, an absorption tower, a vacuum belt conveyor cofferdam, a gypsum cyclone, a vacuum belt dehydrator and a gas-water separator, an overflow port of the gypsum cyclone is connected with the absorption tower through a pipeline, and an underflow port of the gypsum cyclone is connected with a feeding port of the vacuum belt dehydrator through a pipeline. Enabling overflow liquid generated by the gypsum cyclone to automatically flow back to the absorption tower, enabling slurry concentrated by the gypsum cyclone to enter a vacuum belt dehydrator for dehydration treatment, enabling filtrate in the vacuum belt dehydrator to enter a gas-water separator for solid-liquid separation, collecting the filtrate to a cofferdam of a vacuum belt conveyor, and enabling the filtrate to automatically flow into a wastewater treatment system; therefore, the water balance of the desulfurization system can be maintained, the quality of gypsum is ensured, the system is simplified, the installation space is saved, and the operation cost and the investment cost are reduced.

Description

Technical Field

[0001] The utility model belongs to a dehydration system, in particular to a gypsum slurry dehydration system, which is suitable for dehydrating gypsum slurry in a wet desulfurization system of a biomass boiler. Background Art

[0002] Biomass boiler flue gas has a high moisture content, so the wet desulfurization system consumes less water and needs to discharge a large amount of water. At present, in the biomass boiler wet desulfurization system, in order to maintain the water balance of the system, the cyclone overflow, the water outlet of the gas-water separator, and the vacuum belt conveyor flushing water are all collected to the vacuum belt conveyor cofferdam, and flow to the filtrate water tank by gravity, and the filtrate water pump returns one way to the absorption tower and the other way to the wastewater treatment system (wastewater tank). This process has the disadvantages of complex system, high operating cost, and high investment cost. Utility Model Content

[0003] The utility model aims to provide a gypsum slurry dehydration system to solve the problems existing in the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A gypsum slurry dehydration system comprises a gypsum slurry discharge pump, an absorption tower, a vacuum belt conveyor cofferdam, a gypsum cyclone, a vacuum belt dehydrator and an air-water separator, wherein the feed port of the gypsum cyclone is connected to one end of the gypsum slurry discharge pump through a pipeline, the overflow port of the gypsum cyclone is connected to the absorption tower through a pipeline, the bottom flow port of the gypsum cyclone is connected to the feed port of the vacuum belt dehydrator through a pipeline; and the top inlet of the air-water separator is connected to the vacuum belt dehydrator through a vacuum pipe.

[0006] The gypsum cyclone comprises an overflow box, an underflow box and a cyclone. The underflow box is arranged at the lower end of the overflow box, the cyclone is connected to the overflow box, and the overflow box and the underflow box are connected through an overflow outlet pipe.

[0007] The feed port of the overflow box is connected to one end of the gypsum slurry discharge pump through a pipeline.

[0008] The overflow port of the overflow box is connected to the absorption tower through a pipeline.

[0009] The underflow port of the underflow box is connected with the feed port of the vacuum belt dehydrator through a pipeline.

[0010] The vacuum belt dehydrator includes an active roller, a driven roller, a tensioning device, a driving device, a filter cloth, a rubber belt, a feeding device, a vacuum box, and a pneumatic deviation-correcting device for the filter cloth. The active roller is connected to the driving device, the driven roller is connected to the tensioning device and the pneumatic deviation-correcting device for the filter cloth, the filter cloth is located above the rubber belt, and the rubber belt slides on the vacuum box.

[0011] The vacuum box is provided with a vacuum tube, which is connected to the gas-water separator

[0012] The advantages of the utility model are:

[0013] The overflow liquid produced by the gypsum cyclone flows back to the absorption tower by gravity, and the slurry concentrated by the gypsum cyclone enters the vacuum belt dehydrator for dehydration treatment. The filtrate in the vacuum belt dehydrator enters the gas-water separator for solid-liquid separation. The filtrate is collected in the vacuum belt conveyor cofferdam and flows to the wastewater treatment system by gravity. This can not only maintain the water balance of the desulfurization system and ensure the quality of gypsum, but also simplify the system, save installation space, and reduce operating costs and investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0015] Figure 1 It is a schematic diagram of a gypsum slurry dehydration system of the utility model; Figure 2 Schematic diagram of the raw gypsum slurry dewatering system.

[0016] Figure numerals: 1, gypsum cyclone; 101, overflow box; 102, underflow box; 103, cyclone; 2, vacuum belt dehydrator; 3, gas-water separation. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1As shown, a gypsum slurry dehydration system includes a gypsum slurry discharge pump, an absorption tower, a vacuum belt conveyor cofferdam, a gypsum cyclone 1, a vacuum belt dehydrator 2 and a gas-water separator 3, wherein the feed port of the gypsum cyclone 1 is connected to one end of the gypsum slurry discharge pump through a pipeline, the overflow port of the gypsum cyclone 1 is connected to the absorption tower through a pipeline, the bottom flow port of the gypsum cyclone 1 is connected to the feed port of the vacuum belt dehydrator 2 through a pipeline; the top inlet of the gas-water separator 3 is connected to the vacuum belt dehydrator 2 through a vacuum pipe, and the bottom liquid outlet of the gas-water separator 3 is connected to the vacuum belt conveyor cofferdam through a pipeline.

[0019] The gypsum cyclone 1 comprises an overflow box 101, an underflow box 102 and a cyclone 103. The underflow box 102 is arranged at the lower end of the overflow box 101. The overflow box 101 is connected to the cyclone 103. The overflow box 101 and the underflow box 102 are connected through an overflow outlet pipe.

[0020] The feed port of the overflow box 101 is connected to one end of the gypsum slurry discharge pump through a pipeline.

[0021] The overflow port of the overflow box 101 is connected to the absorption tower through a pipeline.

[0022] The underflow port of the underflow box 102 is connected to the feed port of the vacuum belt dehydrator 2 through a pipeline.

[0023] The vacuum belt dehydrator 2 includes an active roller, a driven roller, a tensioning device, a driving device, a filter cloth, a rubber belt, a feeding device, a vacuum box, and a pneumatic deviation-correcting device for the filter cloth. The active roller is connected to the driving device, the driven roller is connected to the tensioning device and the pneumatic deviation-correcting device for the filter cloth, the filter cloth is located above the rubber belt, and the rubber belt slides on the vacuum box.

[0024] The active roller and the driven roller have the same diameter; the driving device includes a variable frequency motor and a reduction box, and the reduction box is connected to the active roller shaft through a coupling; the tensioning device is a roller; the feeding device includes a slurry distribution pipe, a guide plate, a flat plate and a porous plate; a vacuum tube is provided on the vacuum box, and the vacuum tube is connected to the air-water separator 3; the filter cloth pneumatic correction device includes a baffle arm, a pneumatic control valve, an airbag and a correction roller.

[0025] The flushing water of the vacuum belt dehydrator is collected in the vacuum belt machine cofferdam and flows to the wastewater treatment system by gravity.

[0026] Workflow:

[0027] The gypsum crystals in the slurry pool are pumped to the gypsum cyclone 1 by the gypsum slurry discharge pump, and the overflow liquid generated by the cyclone 103 enters the overflow box 101. The overflow liquid flows by gravity into the absorption tower through the pipeline, and the high-concentration underflow enters the liquid collector 4. The slurry concentrated by the cyclone 103 enters the underflow box 102. The slurry is discharged from the bottom of the underflow box 102 and sent to the vacuum belt dehydrator for dehydration. The filtrate entering the vacuum box of the vacuum belt dehydrator 2 then enters the gas-water separator 3 and under the action of the gas-water separator 3, the filtrate with low suspended matter content and high chloride ion content is discharged into the vacuum belt conveyor cofferdam through the pipeline, and finally flows by gravity to the wastewater treatment system for wastewater treatment.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A gypsum slurry dehydration system, characterized in that: The invention comprises a gypsum slurry discharge pump, an absorption tower, a vacuum belt conveyor cofferdam, a gypsum cyclone (1), a vacuum belt dehydrator (2) and a gas-water separator (3); the feed port of the gypsum cyclone (1) is connected to one end of the gypsum slurry discharge pump via a pipeline, the overflow port of the gypsum cyclone (1) is connected to the absorption tower via a pipeline, the bottom flow port of the gypsum cyclone (1) is connected to the feed port of the vacuum belt dehydrator (2) via a pipeline; and the top inlet of the gas-water separator (3) is connected to the vacuum belt dehydrator (2) via a vacuum pipe.

2. The gypsum slurry dehydration system according to claim 1, characterized in that: The gypsum cyclone (1) comprises an overflow box (101), an underflow box (102) and a cyclone (103); the underflow box (102) is arranged at the lower end of the overflow box (101); the overflow box (101) is connected to the cyclone (103); and the overflow box (101) and the underflow box (102) are connected via an overflow outlet pipe.

3. The gypsum slurry dehydration system according to claim 2, characterized in that: The feed port of the overflow box (101) is connected to one end of a gypsum slurry discharge pump via a pipeline.

4. The gypsum slurry dehydration system according to claim 2, characterized in that: The overflow port of the overflow box (101) is connected to the absorption tower through a pipeline.

5. The gypsum slurry dehydration system according to claim 2, characterized in that: The underflow port of the underflow box (102) is connected to the feed port of the vacuum belt dehydrator (2) via a pipeline.

6. The gypsum slurry dehydration system according to claim 1, characterized in that: The vacuum belt dehydrator (2) comprises an active roller, a driven roller, a tensioning device, a driving device, a filter cloth, a rubber belt, a feeding device, a vacuum box, and a pneumatic deviation-correcting device for the filter cloth, wherein the active roller is connected to the driving device, the driven roller is connected to the tensioning device and the pneumatic deviation-correcting device for the filter cloth, the filter cloth is located above the rubber belt, and the rubber belt slides on the vacuum box.

7. The gypsum slurry dehydration system according to claim 6, characterized in that: The vacuum box is provided with a vacuum tube, and the vacuum tube is connected to the gas-water separator (3).

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