Device, method and dehydration system for achieving energy-saving operation of vacuum belt conveyor dehydrator

Abstract

The application discloses a device and method for realizing energy-saving operation of a vacuum belt machine dewaterer and a dewatering system, and relates to the technical field of limestone / gypsum method flue gas desulfurization slurry dewatering. The device comprises a slurry particle size separation device and a plurality of buffer tanks; the slurry particle size separation device separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls on the filter cloth located above the belt of the vacuum belt dewaterer, and the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases successively in the advancing direction of the belt of the vacuum belt dewaterer. The application can improve the dewatering effect of the vacuum belt dewaterer, improve the dewatering efficiency of the vacuum belt dewaterer, and reduce the dewatering vacuum degree and the energy consumption of the vacuum pump.

Description

Technical Field

[0001] This invention relates to the field of limestone / gypsum flue gas desulfurization slurry dewatering technology, and in particular to an apparatus, method and dewatering system for achieving energy-saving operation of a vacuum belt conveyor dewatering machine. Background Technology

[0002] Vacuum belt dewatering machines are widely used in flue gas desulfurization practices in thermal power plants. Gypsum slurry is evenly distributed onto filter cloth via a feed box. The water in the gypsum is filtered by the filter cloth under the influence of gravity and the negative pressure created by the vacuum pump – this is the suction filtration process. In actual operation, slurry dewatering is often initiated based on the density and liquid level within the desulfurization tower reaching set values. However, the crystallization status of the slurry within the desulfurization tower, especially the particle size, morphology, and distribution of the gypsum crystals, is not monitored or controlled. During the gypsum dewatering filtration process, gypsum crystal particles of different sizes and shapes are mixed and arranged on the filter cloth. The mixing of coarse, medium, and fine particles during the suction filtration process results in high filtration resistance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the shortcomings of the prior art, specifically by providing a device, method, and dewatering system for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, as detailed below:

[0004] 1) In a first aspect, the present invention provides a device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, the specific technical solution of which is as follows:

[0005] Includes a slurry particle size separation device and multiple buffer tanks;

[0006] The slurry particle size separation device separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth located above the belt of the vacuum belt dewatering machine, and along the forward direction of the belt of the vacuum belt dewatering machine, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially.

[0007] The beneficial effects of the device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine provided by this invention are as follows:

[0008] From the perspective of filtration hydraulics, separating gypsum particles in desulfurization slurry according to particle size can improve the dewatering effect and efficiency of the vacuum belt dewatering machine, while reducing the dewatering vacuum degree and vacuum pump energy consumption.

[0009] Based on the above solution, the device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to the present invention can be further improved as follows.

[0010] Furthermore, it also includes a first hydrocyclone;

[0011] After the first hydrocyclone separates the desulfurization slurry in the desulfurization tower slurry pool, a portion of the separated gypsum slurry flows into the slurry particle size separation device.

[0012] Furthermore, the desulfurization tower discharge pump transports the desulfurization slurry in the desulfurization tower slurry pool to the first hydrocyclone.

[0013] Furthermore, it also includes an overflow buffer tank and a second hydrocyclone. The overflow buffer tank is connected to the slurry particle size separation device. When the slurry particle size separation device overflows, the overflowing gypsum slurry flows into the overflow buffer tank. The second hydrocyclone performs hydrocyclone separation on the gypsum slurry in the overflow buffer tank to obtain underflow gypsum slurry and topflow gypsum slurry. The underflow gypsum slurry flows onto the filter cloth located above the belt of the vacuum belt dewatering machine, and the topflow gypsum slurry flows into the subsequent equipment.

[0014] Furthermore, the vacuum belt dewatering machine adjusts the vacuum pump's pumping volume and vacuum level, as well as the belt's forward speed, based on the gypsum slurry flow rate falling from each buffer tank.

[0015] 2) Secondly, the present invention also provides a method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, the specific technical solution of which is as follows:

[0016] The slurry particle size separation device separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth located above the belt of the vacuum belt dewatering machine, and along the forward direction of the belt of the vacuum belt dewatering machine, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially.

[0017] Based on the above solution, the method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to the present invention can be further improved as follows.

[0018] Furthermore, it also includes:

[0019] After the first hydrocyclone separates the desulfurization slurry in the desulfurization tower slurry pool, a portion of the separated gypsum slurry flows into the slurry particle size separation device.

[0020] Furthermore, it also includes:

[0021] When the slurry particle size separation device overflows, the overflowing gypsum slurry flows into the overflow buffer tank. The second hydrocyclone separates the gypsum slurry in the overflow buffer tank by hydrocyclone separation, resulting in underflow gypsum slurry and topflow gypsum slurry. The underflow gypsum slurry flows onto the filter cloth located above the belt of the vacuum belt dewatering machine, while the topflow gypsum slurry flows into the subsequent equipment. The overflow buffer tank is connected to the slurry particle size separation device.

[0022] Furthermore, it also includes: the vacuum belt dewatering machine adjusts the pumping volume and vacuum level of the vacuum pump, as well as the forward speed of the belt, according to the flow rate of the gypsum slurry falling from each buffer tank.

[0023] 3) In a third aspect, the present invention also provides a vacuum belt conveyor dewatering system, including a vacuum belt conveyor dewatering machine and any of the devices for realizing energy-saving operation of the vacuum belt conveyor dewatering machine.

[0024] It should be noted that the beneficial effects of the technical solutions of the second and third aspects of the present invention and their corresponding possible implementations can be found in the above description of the technical effects of the first aspect and its corresponding possible implementations, and will not be repeated here. Attached Figure Description

[0025] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of a device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to an embodiment of the present invention;

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 100. Desulfurization tower slurry tank; 120. Desulfurization tower discharge pump; 130. First hydrocyclone; 131. First pipeline; 132. Fourth pipeline; 133. Second pipeline; 134. Third pipeline; 200. Slurry particle size separation device; 210. Coarse particle size buffer tank; 211. Medium particle size gypsum filter cake; 220. Medium particle size buffer tank; 221. Medium particle size gypsum filter cake; 230. Fine particle size buffer tank; 231. Fine particle size gypsum filter cake; 240. Overflow buffer tank; 250. Hydrocyclone feed pump; 260. Second hydrocyclone; 261. Fifth pipeline; 262. Sixth pipeline; 300. Vacuum belt dewatering machine; 310. Filter cloth; 400. Vacuum pump. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, an embodiment of the present invention provides a device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, comprising a slurry particle size separation device 200 and multiple buffer tanks;

[0031] The slurry particle size separation device 200 separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300, and along the forward direction of the belt of the vacuum belt dewatering machine 300, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially.

[0032] Optionally, the above technical solution also includes a first cyclone separator 130;

[0033] After the first hydrocyclone 130 separates the desulfurization slurry in the desulfurization tower slurry pool 100 by hydrocyclone separation, a portion of the separated gypsum slurry flows into the slurry particle size separation device 200.

[0034] The gypsum slurry received by the slurry particle size separation device 200 is explained as follows:

[0035] 1) First interpretation:

[0036] The desulfurization tower discharge pump 120 transports the desulfurization slurry in the desulfurization tower slurry tank 100 to the first hydrocyclone 130. The first hydrocyclone 130 performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry tank 100 to obtain gypsum slurry containing coarse particles and gypsum slurry other than gypsum slurry containing coarse particles. The gypsum slurry containing coarse particles falls directly onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300. The gypsum slurry other than gypsum slurry containing coarse particles flows into the slurry particle size separation device 200. The gypsum slurry other than gypsum slurry containing coarse particles is the gypsum slurry received by the slurry particle size separation device 200.

[0037] It is understandable that using different specifications of first hydrocyclones will result in different gypsum slurries with coarse particles and gypsum slurries other than those containing coarse particles.

[0038] 2) The desulfurization tower discharge pump 120 transports the desulfurization slurry in the desulfurization tower slurry tank 100 to the first hydrocyclone 130. The first hydrocyclone 130 performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry tank 100 to obtain gypsum slurry containing coarse particles and gypsum slurry other than gypsum slurry containing coarse particles. The gypsum slurry containing coarse particles falls directly onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300. Part of the gypsum slurry other than gypsum slurry containing coarse particles flows into the slurry particle size separation device 200. The remaining part of the gypsum slurry other than gypsum slurry containing coarse particles flows into the downstream equipment. The downstream equipment can be the desulfurization tower slurry tank 100, the desulfurization wastewater system, and the filtrate tank, which can be set according to the actual situation.

[0039] 3) The third explanation:

[0040] A pipeline is installed between the desulfurization tower discharge pump 120 and the slurry particle size separation device 200. The desulfurization tower discharge pump 120 directly transports the desulfurization slurry in the desulfurization tower slurry pool 100 to the slurry particle size separation device 200 through the pipeline. The desulfurization slurry in the desulfurization tower slurry pool 100 drawn by the desulfurization tower discharge pump 120 through the pipeline is the gypsum slurry received by the slurry particle size separation device 200.

[0041] The number of buffer tanks can be set according to actual conditions. In one embodiment, there are three buffer tanks, specifically including a coarse-particle buffer tank 210, a medium-particle buffer tank 220, and a fine-particle buffer tank 230. Along the forward direction of the belt of the vacuum belt dewatering machine 300, the coarse-particle buffer tank 210, the medium-particle buffer tank 220, and the fine-particle buffer tank 230 are arranged in sequence, and the particle size range of gypsum particles in the coarse-particle buffer tank 210, the medium-particle buffer tank 220, and the fine-particle buffer tank 230 decreases in sequence.

[0042] Optionally, the above technical solution also includes an overflow buffer tank 240 and a second hydrocyclone 260. The overflow buffer tank 240 is connected to the slurry particle size separation device 200. When the slurry particle size separation device 200 overflows, the overflowing gypsum slurry flows into the overflow buffer tank 240. The second hydrocyclone 260 performs hydrocyclone separation on the gypsum slurry in the overflow buffer tank 240 to obtain underflow gypsum slurry and topflow gypsum slurry. The underflow gypsum slurry flows onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300, and the topflow gypsum slurry flows into subsequent equipment.

[0043] Optionally, in the above technical solution, the vacuum belt dewatering machine 300 adjusts the pumping volume and vacuum level of the vacuum pump 400, as well as the forward speed of the belt, according to the falling flow rate of the gypsum slurry in each buffer tank.

[0044] The following describes, through another embodiment, a device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to the present invention and its operating principle.

[0045] In this embodiment, there are three buffer tanks: a coarse-particle buffer tank 210, a medium-particle buffer tank 220, and a fine-particle buffer tank 230. These three tanks are arranged sequentially along the forward direction of the vacuum belt dewatering machine 300, with the particle size range of the gypsum particles decreasing sequentially from tank 210 to 230. Therefore:

[0046] 1) The desulfurization tower discharge pump 120 transports the desulfurization slurry in the desulfurization tower slurry pool 100 to the first hydrocyclone 130. After the first hydrocyclone 130 performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry pool 100, it obtains gypsum slurry containing coarse particles and gypsum slurry other than gypsum slurry containing coarse particles.

[0047] In this embodiment, the connection between the first pipe 131 and the second pipe 133 is closed, the connection between the first pipe 131 and the fourth pipe 132 is opened, and the connection between the first pipe 131 and the third pipe 134 is opened. At this time, the gypsum slurry, except for the gypsum slurry containing coarse particles, flows into the slurry particle size separation device 200 through the first pipe 131 and the third pipe 134 in sequence.

[0048] Wherein, the first pipe 131 refers to the pipe connected between the first hydrocyclone 130 and the second pipe 133, the other end of the second pipe 133 is connected to the subsequent equipment, the first pipe 131 is also connected to the third pipe 134, the third pipe 134 is connected to the slurry particle size separation device 200, the first hydrocyclone 130 is also connected to the fourth pipe 132, the other end of the fourth pipe 132 leads to the filter cloth 310 above the belt of the vacuum belt dewatering machine 300.

[0049] In another embodiment, a pipeline is provided between the desulfurization tower discharge pump 120 and the slurry particle size separation device 200, through which the desulfurization tower discharge pump 120 directly transports the desulfurization slurry in the desulfurization tower slurry pool 100 to the slurry particle size separation device 200.

[0050] In another embodiment, the connection between the first pipe 131 and the second pipe 133 is opened, the connection between the first pipe 131 and the fourth pipe 132 is opened, and the connection between the first pipe 131 and the third pipe 134 is opened. At this time, the first hydrocyclone 130 performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry pool 100 to obtain gypsum slurry containing coarse particles and gypsum slurry other than gypsum slurry containing coarse particles. Part of the gypsum slurry other than gypsum slurry containing coarse particles flows into the slurry particle size separation device 200 through the first pipe 131 and the third pipe 134 in sequence. The remaining part of the gypsum slurry other than gypsum slurry containing coarse particles flows into the subsequent equipment through the first pipe 131 and the second pipe 133 in sequence. The gypsum slurry containing coarse particles falls directly onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300.

[0051] 2) The slurry particle size separation device 200 separates the received gypsum slurry according to the particle size of the gypsum particles. The gypsum slurry containing coarse gypsum particles enters the coarse particle size buffer tank 210, the gypsum slurry containing medium gypsum particles enters the medium particle size buffer tank 220, and the gypsum slurry containing fine gypsum particles enters the fine particle size buffer tank 230. The coarse particle size range is [60um, +∞), the medium particle size range is [40um, 70um], and the fine particle size range is [20um, 50um].

[0052] Utilizing the buffer time of each buffer tank, gypsum particles are arranged on filter cloth 310 in the order of coarse, medium and fine, forming coarse-particle gypsum filter cake 211, medium-particle gypsum filter cake 221 and fine-particle gypsum filter cake 231 in sequence.

[0053] In another embodiment, there are four buffer tanks. In addition to the coarse-particle buffer tank 210, medium-particle buffer tank 220 and fine-particle buffer tank 230, there is also an ultra-fine-particle buffer tank. The gypsum slurry containing ultra-fine-particle gypsum particles is fed into the ultra-fine-particle buffer tank. The ultra-fine particle size range is (0, 30 μm). The coarse-particle buffer tank 210, medium-particle buffer tank 220, fine-particle buffer tank 230 and ultra-fine-particle buffer tank are arranged in sequence along the forward direction of the belt of the vacuum belt dewatering machine 300.

[0054] The vacuum belt dewatering machine 300 adjusts the pumping volume and vacuum level of the vacuum pump 400, as well as the forward speed of the belt, according to the falling flow rate of each buffer tank.

[0055] Among them, the vacuum belt dewatering machine 300 is the equipment in the original desulfurization system, and the vacuum pump 400 has the function of adjusting the vacuum degree and the pumping volume. It can be achieved by means of variable frequency motor drive, water ring water volume adjustment or magnetic levitation vacuum pump 400.

[0056] 3) It also includes an overflow buffer tank 240 and a second hydrocyclone 260. The overflow buffer tank 240 is connected to the slurry particle size separation device 200. When the slurry particle size separation device 200 overflows, the overflowing gypsum slurry flows into the overflow buffer tank 240. The hydrocyclone feed pump 250 transports the gypsum slurry flowing into the overflow buffer tank 240 to the second hydrocyclone 260. The second hydrocyclone 260 performs hydrocyclone separation on the gypsum slurry in the overflow buffer tank 240 to obtain bottom flow gypsum slurry and top flow gypsum slurry. The bottom flow gypsum slurry flows through the fifth pipe 261 to the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300. The top flow gypsum slurry flows through the sixth pipe 262 into the second pipe 133 until it flows into the subsequent equipment.

[0057] The second hydrocyclone 260 is connected to the fifth pipe 261, the other end of which leads to the filter cloth 310 above the belt of the vacuum belt dewatering machine 300. The second hydrocyclone 260 is also connected to the sixth pipe 262, which is connected to the second pipe 133.

[0058] This invention separates gypsum particles in desulfurization slurry according to their particle size, arranging the gypsum particles in a coarse, medium, and fine order on filter cloth 310 to form coarse-particle-size gypsum filter cake 211, medium-particle-size gypsum filter cake 221, and fine-particle-size gypsum filter cake 231 in sequence. This achieves an energy-saving filtration process based on the basic principles of filtration hydraulics, reduces filtration resistance, lowers the vacuum level of the desulfurization slurry during vacuum belt dewatering, and reduces the power consumption of the vacuum pump 400, thus achieving energy saving. Moreover, this invention does not change the water balance and material balance of the original desulfurization system.

[0059] An embodiment of the present invention provides a method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, comprising the following steps:

[0060] S1. The slurry particle size separation device 200 separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300, and along the forward direction of the belt of the vacuum belt dewatering machine 300, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially.

[0061] Optionally, the above technical solution also includes:

[0062] After the first hydrocyclone 130 separates the desulfurization slurry in the desulfurization tower slurry pool 100 by hydrocyclone separation, a portion of the separated gypsum slurry flows into the slurry particle size separation device 200.

[0063] Optionally, the above technical solution also includes:

[0064] S2. When the slurry particle size separation device 200 overflows, the overflowing gypsum slurry flows into the overflow buffer tank 240. The second hydrocyclone 260 performs hydrocyclone separation on the gypsum slurry in the overflow buffer tank 240 to obtain bottom flow gypsum slurry and top flow gypsum slurry. The bottom flow gypsum slurry flows onto the filter cloth 310 located above the belt of the vacuum belt dewatering machine 300, and the top flow gypsum slurry flows into the subsequent equipment. The overflow buffer tank 240 is connected to the slurry particle size separation device 200.

[0065] Optionally, the above technical solution also includes:

[0066] S3, the vacuum belt dewatering machine 300 adjusts the pumping volume and vacuum level of the vacuum pump 400, as well as the forward speed of the belt, according to the flow rate of the gypsum slurry falling from each buffer tank.

[0067] Optionally, in the above technical solution, the desulfurization tower discharge pump 120 transports the desulfurization slurry in the desulfurization tower slurry pool 100 to the first hydrocyclone 130.

[0068] The implementation of each step in the above-described method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to the present invention can be referred to the embodiments of the device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine described above, and will not be repeated here.

[0069] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given by the present invention. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0070] An embodiment of the present invention provides a vacuum belt conveyor dewatering system, comprising a vacuum belt conveyor dewatering machine and any device for achieving energy-saving operation of the vacuum belt conveyor dewatering machine.

[0071] An embodiment of the present invention provides a desulfurization system, including the aforementioned vacuum belt conveyor dewatering system.

[0072] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, characterized in that, Includes a slurry particle size separation device and multiple buffer tanks; The slurry particle size separation device separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth located above the belt of the vacuum belt dewatering machine, and along the forward direction of the belt of the vacuum belt dewatering machine, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially. It also includes the first hydrocyclone; After the first hydrocyclone separates the desulfurization slurry in the desulfurization tower slurry pool by hydrocyclone separation, a portion of the separated gypsum slurry flows into the slurry particle size separation device. The desulfurization tower discharge pump transports the desulfurization slurry from the desulfurization tower slurry pool to the first hydrocyclone. The first hydrocyclone performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry pool, obtaining gypsum slurry containing coarse particles and gypsum slurry other than those containing coarse particles. The gypsum slurry containing coarse particles falls directly onto the filter cloth located above the belt of the vacuum belt dewatering machine. The gypsum slurry other than those containing coarse particles flows into the slurry particle size separation device. The gypsum slurry other than those containing coarse particles is the gypsum slurry received by the slurry particle size separation device. Alternatively, the desulfurization tower discharge pump transports the desulfurization slurry from the desulfurization tower slurry pool to the first hydrocyclone, and the first hydrocyclone performs hydrocyclone separation on the desulfurization tower slurry. The desulfurization slurry in the pool undergoes hydrocyclone separation to obtain gypsum slurry containing coarse particles and gypsum slurry other than those containing coarse particles. The gypsum slurry containing coarse particles is directly dropped onto the filter cloth located above the belt of the vacuum belt dewatering machine. A portion of the gypsum slurry other than those containing coarse particles flows into the slurry particle size separation device. Alternatively, a pipeline is installed between the desulfurization tower discharge pump and the slurry particle size separation device. The desulfurization tower discharge pump directly transports the desulfurization slurry in the desulfurization tower slurry pool to the slurry particle size separation device through this pipeline. The desulfurization slurry in the desulfurization tower slurry pool pumped by the desulfurization tower discharge pump through this pipeline is the gypsum slurry received by the slurry particle size separation device.

2. The device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to claim 1, characterized in that, The desulfurization tower discharge pump delivers the desulfurization slurry in the desulfurization tower slurry pool to the first hydrocyclone.

3. The device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to any one of claims 1 to 2, characterized in that, It also includes an overflow buffer tank and a second hydrocyclone. The overflow buffer tank is connected to the slurry particle size separation device. When the slurry particle size separation device overflows, the overflowing gypsum slurry flows into the overflow buffer tank. The second hydrocyclone performs hydrocyclone separation on the gypsum slurry in the overflow buffer tank to obtain bottom flow gypsum slurry and top flow gypsum slurry. The bottom flow gypsum slurry flows onto the filter cloth located above the belt of the vacuum belt dewatering machine, and the top flow gypsum slurry flows into subsequent equipment.

4. A device for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to any one of claims 1 to 2, characterized in that, The vacuum belt dewatering machine adjusts the pumping volume and vacuum level of the vacuum pump, as well as the forward speed of the belt, according to the flow rate of gypsum slurry falling from each buffer tank.

5. A method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine, characterized in that, include: The slurry particle size separation device separates the received gypsum slurry according to the particle size of the gypsum particles, and flows the gypsum slurry containing gypsum particles of different particle size ranges into different buffer tanks, so that the gypsum slurry in each buffer tank falls onto the filter cloth located above the belt of the vacuum belt dewatering machine, and along the forward direction of the belt of the vacuum belt dewatering machine, the particle size range of the gypsum particles contained in the gypsum slurry in the buffer tank decreases sequentially. Also includes: After the first hydrocyclone separates the desulfurization slurry in the desulfurization tower slurry pool, a portion of the separated gypsum slurry flows into the slurry particle size separation device. The desulfurization tower discharge pump transports the desulfurization slurry from the desulfurization tower slurry pool to the first hydrocyclone. The first hydrocyclone performs hydrocyclone separation on the desulfurization slurry in the desulfurization tower slurry pool, obtaining gypsum slurry containing coarse particles and gypsum slurry other than those containing coarse particles. The gypsum slurry containing coarse particles falls directly onto the filter cloth located above the belt of the vacuum belt dewatering machine. The gypsum slurry other than those containing coarse particles flows into the slurry particle size separation device. The gypsum slurry other than those containing coarse particles is the gypsum slurry received by the slurry particle size separation device. Alternatively, the desulfurization tower discharge pump transports the desulfurization slurry from the desulfurization tower slurry pool to the first hydrocyclone, and the first hydrocyclone performs hydrocyclone separation on the desulfurization tower slurry. The desulfurization slurry in the pool undergoes hydrocyclone separation to obtain gypsum slurry containing coarse particles and gypsum slurry other than those containing coarse particles. The gypsum slurry containing coarse particles is directly dropped onto the filter cloth located above the belt of the vacuum belt dewatering machine. A portion of the gypsum slurry other than those containing coarse particles flows into the slurry particle size separation device. Alternatively, a pipeline is installed between the desulfurization tower discharge pump and the slurry particle size separation device. The desulfurization tower discharge pump directly transports the desulfurization slurry in the desulfurization tower slurry pool to the slurry particle size separation device through this pipeline. The desulfurization slurry in the desulfurization tower slurry pool pumped by the desulfurization tower discharge pump through this pipeline is the gypsum slurry received by the slurry particle size separation device.

6. A method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to claim 5, characterized in that, Also includes: When the slurry particle size separation device overflows, the overflowing gypsum slurry flows into the overflow buffer tank. The second hydrocyclone separates the gypsum slurry in the overflow buffer tank by hydrocyclone separation, resulting in underflow gypsum slurry and topflow gypsum slurry. The underflow gypsum slurry flows onto the filter cloth located above the belt of the vacuum belt dewatering machine, and the topflow gypsum slurry flows into subsequent equipment. The overflow buffer tank is connected to the slurry particle size separation device.

7. A method for achieving energy-saving operation of a vacuum belt conveyor dewatering machine according to claim 6, characterized in that, Also includes: The vacuum belt dewatering machine adjusts the pumping volume and vacuum level of the vacuum pump, as well as the forward speed of the belt, according to the flow rate of gypsum slurry falling from each buffer tank.

8. A vacuum belt conveyor dewatering system, characterized in that, It includes a vacuum belt conveyor dewatering machine and a device for achieving energy-saving operation of the vacuum belt conveyor dewatering machine as described in any one of claims 1 to 4.

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