A combined multi-depth sand removal device and process for organic garbage slurry

Abstract

The invention discloses a combined multi-depth sand removal device for organic garbage slurry and a process thereof, the device comprises a combined bin body, which is divided into a left bin and a right bin; an overflow weir plate is provided in the left bin to separate it into chamber A and chamber B; an overflow weir plate is provided in the right bin to separate it into chamber C and chamber D; a primary cyclone and a secondary cyclone are provided above the combined bin body, and the lower outlets of the two are connected to the top of chamber A through a primary cyclone slag liquid pipeline and a secondary cyclone slag liquid pipeline respectively; the overflow outlet at the top of the primary cyclone is connected to the top of chamber B through a primary cyclone light liquid pipeline, and the overflow outlet at the top of the secondary cyclone is connected to the top of chamber C through a secondary cyclone light liquid pipeline; the upper side feed port of the primary cyclone is connected to the slag slurry feed pipeline, and the upper side feed port of the secondary cyclone is connected to the primary liquid discharge pipeline at the bottom of chamber B. The device has a compact structure, small footprint, continuous and automated processing process, and does not cause secondary pollution to the environment.

Description

Technical Field

[0001] The invention relates to the field of deep sand removal of organic garbage slurry, and in particular to a deep sand removal device and process for organic garbage slurry. Background Art

[0002] Organic waste, i.e. wet waste (kitchen waste, kitchen waste, waste vegetables, fruit and vegetable waste, livestock and poultry manure, etc.), is usually treated by anaerobic fermentation. Anaerobic fermentation is a process of biodegrading organic matter by relying on the biochemical action of facultative anaerobes and obligate anaerobes under the condition of isolation from air. Improving the quality of anaerobic fermentation slurry and ensuring that impurities in the slurry, especially impurities with a density greater than water such as gravel, are thoroughly removed can ensure the long-term stable operation of the anaerobic fermentation reactor, reduce the damage to the anti-corrosion in the reactor tank, reduce the reduction of the effective volume of the tank and the blockage of the pipeline, and extend the service life of the anaerobic fermentation reactor and its supporting pipelines, pumps and valves.

[0003] Therefore, before anaerobic fermentation, preliminary pretreatment processes such as removal of large debris, separation, and crushing are required, and the organic wastewater with high concentration, high oil content, and high sand content generated by the pretreatment process is made into organic slurry before anaerobic fermentation treatment. However, due to the complex and diverse composition of organic waste, the organic slurry produced by its pretreatment is a high-concentration sand-containing organic wastewater, which contains a large amount of fine gravel, broken eggshells, broken glass, bone slag and other high-density substances. In the subsequent treatment process, it will cause great wear and tear on the treatment equipment, oil-water separation equipment, pumps, valves, pipelines, etc., and easily cause pipeline blockage and other problems; at the same time, too many and too large organic matter particles will cause impurities to accumulate and reduce the volume in the anaerobic fermentation tank, and the risk of a decrease in the anaerobic biogas production rate at the back end or a risk of tank cleaning and shutdown.

[0004] However, the general sand removal equipment currently used for sand removal of such organic slurry is not effective, and the sand and gravel separation is not complete, which often leads to damage to equipment and pipelines, and the workload of maintenance, repair and replacement is large, resulting in accidents such as production suspension and maintenance.

[0005] For example, the Beijing Dagongcun Food Waste Treatment Plant uses a sand-water separator to separate food waste leachate, which uses a conical box with liquid discharge at the top and sand discharge at the bottom in a spiral tilt. It was found that the device did not remove sand thoroughly, and a large amount of water was also discharged when the sand was discharged. The sand content of the discharged liquid was too high, which easily caused subsequent separation equipment to be blocked and worn, and often stopped for maintenance.

[0006] For example, the Chengdu Shuangliu food waste treatment plant uses a sand removal device that combines a cyclone separator and a sand-water separator. In actual use, this device also has problems such as excessive sand content in the effluent, which easily causes blockage and wear of subsequent separation equipment.

[0007] In summary, in the field of deep sand removal treatment of organic waste slurry, there is currently a lack of an integrated multiple sand removal device and process that can effectively separate inorganic impurities from the slurry and has deep and detailed sand removal (fine sand removal) functions. Summary of the invention

[0008] The purpose of the present invention is to provide a combined multi-depth sand removal device and process for organic waste slurry, especially for organic waste, i.e. wet waste (kitchen waste, kitchen waste, waste vegetables, fruit and vegetable waste, livestock and poultry feces, etc.), high-concentration and high-fat organic wastewater and other raw materials, after pulping, before anaerobic fermentation, the slurry is deeply sanded.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0010] A combined multi-depth sand removal device for organic garbage slurry, comprising a combined bin body, wherein the interior of the combined bin body is divided into a left bin and a right bin by a bin partition plate, and the left bin and the right bin are completely separated;

[0011] An overflow weir is provided in the left bin, and the overflow weir separates the left bin into chamber A and chamber B; an overflow weir is provided in the right bin, and the overflow weir separates the right bin into chamber C and chamber D;

[0012] A primary cyclone and a secondary cyclone are provided above the combined bin body, the lower outlet of the primary cyclone is connected to a primary cyclone slag liquid pipeline, the lower outlet of the secondary cyclone is connected to a secondary cyclone slag liquid pipeline, and the primary cyclone slag liquid pipeline and the secondary cyclone slag liquid pipeline are both connected to one side of the top of chamber A;

[0013] The overflow outlet at the top of the first-stage cyclone is connected to the first-stage cyclone light liquid pipeline, which is connected to the top of chamber B of the combined warehouse body; the overflow outlet at the top of the second-stage cyclone is connected to the second-stage cyclone light liquid pipeline, which is connected to one side of the top of chamber C of the combined warehouse body;

[0014] The upper side feed port of the first-stage cyclone is connected to the slag slurry feed pipeline, and the upper side feed port of the second-stage cyclone is connected to the first-stage liquid discharge pipeline at the bottom of the B chamber of the combined bin body.

[0015] Wherein, the front end of the upper side feed port of the first-stage cyclone and the front end of the upper side feed port of the second-stage cyclone are both provided with a regulating valve and a pressure gauge.

[0016] Among them, the partition plate completely isolates chamber B from chamber C; chamber A and chamber B are connected to each other through the space above the overflow weir plate in the left chamber; chamber C and chamber D are connected to each other through the space above the overflow weir plate in the right chamber.

[0017] Among them, the A room is provided with a slow flow settling inclined plate 1 and a slow flow settling inclined plate 2; the C room is also provided with a slow flow settling inclined plate 1 and a slow flow settling inclined plate 2.

[0018] Wherein, the lower parts of the chambers A, B, C and D are all in a conical shape;

[0019] The lower outlet of the A chamber is connected to the primary slag discharge pipeline through a manual valve, and the lower outlet of the B chamber is connected to the primary liquid discharge pipeline;

[0020] The lower outlet of the C chamber is connected to the secondary slag discharge pipeline through a manual valve, and the lower outlet of the D chamber is connected to the slurry discharge pipeline;

[0021] The ends of the primary slag discharge pipeline and the secondary slag discharge pipeline are both connected to the main slag discharge pipeline.

[0022] Wherein, a liquid level controller is provided at the lower part of each of the chambers A and C; and a liquid level controller is provided at the upper part and the lower part of each of the chambers B and D.

[0023] Wherein, the left bin and the right bin are both provided with odor exhaust interfaces.

[0024] Among them, the slag slurry feed pipeline, the first-level liquid discharge pipeline, the slag discharge main pipeline, and the slurry discharge pipeline are all equipped with a delivery pump, and the front end pipeline and the rear end pipeline of the delivery pump are respectively provided with a pipeline sight glass and a manual valve.

[0025] Among them, electric valves are provided on the slag slurry feeding pipeline, the first-level slag discharge pipeline and the second-level slag discharge pipeline.

[0026] The device is connected with the delivery pump, electric valve and liquid level controller by PLC control system and performs signal feedback and control.

[0027] The desanding process using the combined multi-depth desanding device is as follows: the organic waste slurry (including slag) raw material enters the upper side feed port of the primary cyclone from the slag slurry feed pipeline through a delivery pump, and a regulating valve can adjust its opening to control the inlet pressure, which is displayed on the pressure gauge, so that the slurry is fed at a certain pressure;

[0028] After the slurry enters the side feed port in the tangential direction of the cylindrical cavity at the upper part of the first-stage cyclone, the slurry rotates in tangentially, generating a high-speed rotating flow field in the cylindrical cavity. The particles with higher density in the slurry mixture move downward along the axial direction of the cyclone under the action of the cyclone field, and move outward along the radial direction of the cyclone at the same time. When reaching the cone section of the cyclone, they move downward along the wall of the device, and are discharged from the outlet at the lower part of the cyclone to the A chamber of the combined bin body, forming an outer vortex flow field in the cyclone. The particles with lower density in the slurry mixture move toward the central axis of the cyclone, and form an upward inner vortex at the center of the axis, and then are discharged from the overflow outlet at the top of the cyclone to the B chamber of the combined bin body.

[0029] The slurry mixture containing high-density particles enters chamber A of the combined silo. Under the slow flow, blocking and guiding effects formed by the combination of the slow flow settling inclined plate 1 and the slow flow settling inclined plate 2, most of the particles settle to the lower part of chamber A of the combined silo and are discharged through the primary slag discharge pipeline.

[0030] Another part of the slurry containing smaller particles overflows into chamber B of the combined bin through the overflow weir plate. The slurry entering chamber B after overflowing enters the upper side feed port of the secondary cyclone from the primary discharge pipeline through the delivery pump;

[0031] The slurry entering the secondary cyclone undergoes centrifugal cyclone sedimentation. Most of the smaller particles separated by the secondary cyclone are returned to chamber A of the combined bin through the outlet at the bottom of the cyclone and enter the sedimentation and separation process again.

[0032] The slurry containing a small amount of fine particles separated by the secondary cyclone is discharged from the overflow outlet at the top of the cyclone to the C chamber of the combined bin body;

[0033] The process of the slurry containing a small amount of fine particles in the C chamber and the D chamber of the combined silo is the same as the sedimentation and overflow principle of the slurry mixture containing large-density particles entering the A chamber and the B chamber of the combined silo. The particles settle to the lower part of the C chamber of the combined silo, and the slag is discharged through the discharge pipeline, that is, the secondary slag discharge pipeline, and is collected with the primary slag discharge pipeline to the main slag discharge pipeline for slag discharge; the slurry after sedimentation and overflow enters the D chamber, and the treated slurry is finally discharged from the slag discharge pipeline at the bottom of the D chamber through the delivery pump;

[0034] The odor discharge interface on the upper part of chamber A and chamber B and chamber C and chamber D of the combined bin body can discharge the odor generated during the treatment process and lead to an external odor removal device, while eliminating air blockage in the combined bin body;

[0035] The processing process is connected by a PLC control system with a delivery pump, electric valve, and liquid level controller for signal feedback and control, so as to maintain the liquid level of each chamber in the combined bin within a reasonable range, set the start and stop and timing of slag and liquid discharge, and make the processing process continuous and automated.

[0036] Compared with the prior art, the outstanding effects of the present invention are:

[0037] (1) The combined multi-depth sand removal device for organic waste slurry of the present invention can effectively overcome the problems of poor effect of existing sand removal equipment in removing sand from organic slurry and incomplete separation of sand and gravel. In the subsequent treatment process, it causes great wear and tear on the treatment equipment, oil-water separation equipment, pumps, valves, pipelines, etc., causing the pipeline to be easily blocked. At the same time, if the particle size of organic matter is too large or too large, it will cause impurities to accumulate and reduce the volume in the anaerobic fermentation tank, resulting in a risk of reduced anaerobic biogas production rate at the back end or tank cleaning and shutdown.

[0038] (2) This device can effectively ensure the long-term stable operation of the anaerobic fermentation reactor, improve the biogas production efficiency of anaerobic fermentation, reduce the damage of corrosion protection in the reactor tank, reduce the reduction of the effective volume of the tank and the blockage of the pipeline, extend the service life of the anaerobic fermentation reactor and its supporting pipelines, pumps and valves, protect subsequent processing equipment, pumps, valves, pipelines, etc., reduce maintenance, repairs, shutdowns and other failures and accidents, and ensure production.

[0039] (3) This device adopts a combined multiple deep sand removal process, which can be used to deeply remove sand from the pulp after pulping of raw materials such as organic waste (i.e., wet waste, including restaurant waste, kitchen waste, waste vegetables, fruit and vegetable waste, livestock and poultry manure, etc.) and high-concentration and high-fat organic wastewater, and before anaerobic fermentation.

[0040] (4) This device is a relatively closed integrated combined integrated device with a compact structure, small footprint, continuous and automated processing process, and no secondary pollution to the environment.

[0041] (5) This device can be used alone or connected to the rear end of a general desander, pulp crusher, homogenizer, etc. to perform deep and fine sand removal; multiple devices can also be connected in series to achieve more multiple and deeper fine sand removal.

[0042] The combined multi-depth sand removal device and process for organic waste slurry described in the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of a combined multi-depth sand removal device for organic garbage slurry according to the present invention;

[0044] Figure 2 This is the front view of the slow flow settling inclined plate 1;

[0045] Figure 3 It is a side view of the slow flow settling inclined plate 1;

[0046] Figure 4 This is the main view of the second slow flow settling inclined plate;

[0047] Figure 5 It is the side view of the second slow flow settling inclined plate.

[0048] Among them, 1-combined bin body, 2-first-stage cyclone, 3-second-stage cyclone, 4-partition plate, 5-slow flow sedimentation inclined plate 1, 6-slow flow sedimentation inclined plate 2, 7-overflow weir plate, 8-regulating valve, 9-conveyance pump, 10-electric valve, 11-pipeline sight glass, 12-manual valve, 13-liquid level controller, 14-pressure gauge, 15-odor discharge interface, 16-PLC control system, 17-slag slurry feeding pipeline, 18-first-stage cyclone slag liquid pipeline, 19-first-stage cyclone light liquid pipeline, 20-first-stage slag discharge pipeline, 21-first-stage liquid discharge pipeline, 22-second-stage cyclone slag liquid pipeline, 23-second-stage cyclone light liquid pipeline, 24-second-stage slag discharge pipeline, 25-slag discharge main pipeline, 26-slurry discharge pipeline. DETAILED DESCRIPTION

[0049] like Figure 1 As shown, a combined multiple-depth sand removal device for organic garbage slurry is composed of a combined bin body 1, a primary cyclone 2, a secondary cyclone 3, a partition plate 4, a slow flow settling inclined plate 1 5, a slow flow settling inclined plate 2 6, an overflow weir plate 7, a regulating valve 8, a delivery pump 9, an electric valve 10, a pipeline sight glass 11, a manual valve 12, a liquid level controller 13, a pressure gauge 14, an odor discharge interface 15, a PLC control system 16, a slag slurry feeding pipeline 17, a primary cyclone slag liquid pipeline 18, a primary cyclone light liquid pipeline 19, a primary slag discharge pipeline 20, a primary liquid discharge pipeline 21, a secondary cyclone slag liquid pipeline 22, a secondary cyclone light liquid pipeline 23, a secondary slag discharge pipeline 24, a slag discharge main pipeline 25, and a slurry discharge pipeline 26, which are relatively closed, integrated combined multiple-depth sand removal and separation devices.

[0050] The interior of the combined warehouse body 1 is divided into a left warehouse and a right warehouse by a partition board 4, and the left warehouse and the right warehouse are completely separated;

[0051] An overflow weir plate 7 is provided in the left bin, and the overflow weir plate 7 divides the left bin into chamber A and chamber B; an overflow weir plate is also provided in the right bin, and the overflow weir plate divides the right bin into chamber C and chamber D;

[0052] A primary cyclone 2 and a secondary cyclone 3 are provided above the combined bin body 1. The lower outlet of the primary cyclone 2 is connected to a primary cyclone slag liquid pipeline 18, and the lower outlet of the secondary cyclone 3 is connected to a secondary cyclone slag liquid pipeline 22. The primary cyclone slag liquid pipeline 18 and the secondary cyclone slag liquid pipeline 22 are both connected to one side of the top of chamber A.

[0053] The overflow outlet at the top of the primary cyclone 2 is connected to the primary cyclone light liquid pipeline 19, and the primary cyclone light liquid pipeline 19 is connected to the top of the B chamber of the combined silo body 1. The overflow outlet at the top of the secondary cyclone 3 is connected to the secondary cyclone light liquid pipeline 23, and the secondary cyclone light liquid pipeline 23 is connected to one side of the top of the C chamber of the combined silo body 1.

[0054] The upper side feed port of the primary cyclone 2 is connected to the slag slurry feed pipeline 17 , and the upper side feed port of the secondary cyclone 3 is connected to the primary liquid discharge pipeline 21 at the bottom of chamber B of the combined bin body 1 .

[0055] A regulating valve 8 and a pressure gauge 14 are provided at the front end of the upper side feed port of the first-stage cyclone 2 and the front end of the upper side feed port of the second-stage cyclone 3 .

[0056] The partition plate 4 completely isolates chamber B from chamber C; the chambers A and B are connected to each other through the space above the overflow weir plate 7 in the left chamber; the chambers C and D are connected to each other through the space above the overflow weir plate in the right chamber.

[0057] A slow flow settling inclined plate 1 5 and a slow flow settling inclined plate 2 6 are arranged in the A chamber; a slow flow settling inclined plate 1 and a slow flow settling inclined plate 2 are also arranged in the C chamber.

[0058] like Figure 2-5 As shown, the slow-flow sedimentation inclined plate 1 5 is a partition composed of two plates with an upright upper portion and a lower portion inclined to both sides, and a width consistent with the inner width of the combined warehouse body 1; the slow-flow sedimentation inclined plate 2 6 is a partition placed at an angle and with a width consistent with the inner width of the combined warehouse body 1.

[0059] The lower parts of chambers A, B, C and D are all tapered;

[0060] The lower outlet of chamber A is connected to the primary slag discharge pipeline 20 through a manual valve 12, and the lower outlet of chamber B is connected to the primary liquid discharge pipeline 21;

[0061] The lower outlet of chamber C is connected to the secondary slag discharge pipeline 24 through a manual valve 12, and the lower outlet of chamber D is connected to the slurry discharge pipeline 26;

[0062] The ends of the primary slag discharge pipeline 20 and the secondary slag discharge pipeline 24 are both connected to the main slag discharge pipeline 25 .

[0063] A liquid level controller 13 is provided at the lower part of each of the A chamber and the C chamber; a liquid level controller 13 is provided at the upper part and the lower part of each of the B chamber and the D chamber.

[0064] The left bin and the right bin are both provided with odor discharge interfaces 15.

[0065] A conveying pump 9 is provided on the slag slurry feed pipeline 17, the primary liquid discharge pipeline 21, the slag discharge main pipeline 25, and the slurry discharge pipeline 26, and a pipeline sight glass 11 is provided on the front end pipeline of the conveying pump 9, and manual valves 12 are provided on the front and rear end pipelines of the conveying pump 9.

[0066] Electric valves 10 are provided on the slag slurry feeding pipeline 17 , the primary slag discharge pipeline 20 and the secondary slag discharge pipeline 24 .

[0067] The device is connected with the delivery pump 9, the electric valve 10 and the liquid level controller 13 by a PLC control system 16 for signal feedback and control.

[0068] The primary cyclone 2, the secondary cyclone 3, the delivery pump 9, the liquid level controller 13, and the PLC control system 16 used in the device are all mature equipment in the market.

[0069] Cyclone: ​​also known as hydrocyclone, cyclone desander, cyclone, etc., is a common separation and classification (light and heavy separation) equipment. It is a mature equipment in the market and has many manufacturers, such as the FX hydrocyclone produced by Weihai Haiwang Cyclone Co., Ltd.

[0070] Delivery pump: a machine for conveying fluid or pressurizing fluid, such as screw pumps, centrifugal pumps, etc. It is a mature equipment in the market with many manufacturers, such as the G40-1 screw pump produced by Shanghai Changshen Pump Manufacturing Co., Ltd.

[0071] Liquid level controller: refers to the detection of high and low liquid levels and transmission of signals through mechanical or electronic methods. The control system can control the solenoid valve, water pump, etc. to start or stop at the liquid level, thereby realizing semi-automation or full automation of the system. It is a mature equipment in the market with many manufacturers, such as the PGT3100 liquid level controller produced by Beijing Guancheng Measurement Technology Co., Ltd.

[0072] PLC control system: a system composed of programmable logic controllers, an electronic device for digital computing designed for industrial production. It is a computer dedicated to industrial control and installed in a control cabinet. It is a mature market device with many manufacturers, such as the S7-200 PLC produced by Siemens.

[0073] The device can be used alone or connected to the rear end of a general desander, pulp crusher, homogenizer and other devices for deep and fine sand removal; multiple devices can also be connected in series to achieve more multiple and deeper fine sand removal.

[0074] This device is used to carry out combined multi-depth sand removal of organic garbage slurry, and its specific process method is as follows:

[0075] The organic waste slurry (including slag) raw material enters the upper side feed port of the primary cyclone 2 from the slag slurry feed pipeline 17 through a delivery pump, and a regulating valve 8 can adjust its opening to control the inlet pressure, which is displayed on the pressure gauge 14, so that the slurry is fed at a certain pressure;

[0076] After the slurry enters the side feed port in the tangential direction of the cylindrical cavity at the upper part of the first-stage cyclone 2, the slurry is tangentially rotated in by utilizing the centrifugal cyclone sedimentation principle of the cyclone, and a high-speed rotating flow field is generated in the cylindrical cavity. The particles with higher density in the slurry mixture move downward along the axial direction of the cyclone under the action of the cyclone field, and move outward along the radial direction of the cyclone at the same time. When reaching the cone section of the cyclone, they move downward along the wall of the device, and are discharged from the outlet at the lower part of the cyclone, i.e., the first-stage cyclone slag liquid pipeline 18 to the A chamber of the combined bin body 1. In this way, an outer vortex flow field is formed in the cyclone, and the particles with lower density in the slurry mixture move toward the central axis of the cyclone, and form an upwardly moving inner vortex at the center of the axis, and then are discharged from the overflow outlet at the top of the cyclone through the first-stage cyclone light liquid pipeline 19 to the B chamber of the combined bin body 1;

[0077] The slurry mixture containing high-density particles enters the chamber A of the combined silo body 1. Under the slow flow, flow blocking and guiding effects formed by the combination of the slow flow settling inclined plate 1 5 and the slow flow settling inclined plate 2 6, the settling time can be shortened, the settling area can be relatively increased, and the settling efficiency can be improved, so that most of the particles can be settled to the lower part of the chamber A of the combined silo body 1, and the slag can be discharged through the discharge pipeline, that is, the primary slag discharge pipeline 20;

[0078] Another part of the slurry containing smaller particles overflows to the B chamber of the combined bin body 1 through the overflow weir plate 7. The overflow weir plate 7 also plays a partial role in blocking the sedimentation of the slurry when it overflows. The slurry entering the B chamber after overflowing enters the upper side feed port of the secondary cyclone 3 from the primary discharge pipeline 21 through the delivery pump 9;

[0079] The slurry entering the secondary cyclone 3 has the same working principle as the primary cyclone 2, which is to further realize the centrifugal cyclone sedimentation. Most of the smaller particles separated by the secondary cyclone 3 enter the secondary cyclone slag liquid pipeline 22 through the outlet at the bottom of the cyclone and are returned to the A chamber of the combined bin body 1 to enter the secondary sedimentation separation process.

[0080] The slurry containing a small amount of fine particles separated by the secondary cyclone 3 is discharged from the overflow outlet at the top of the cyclone through the secondary cyclone light liquid pipeline 23 to the C chamber of the combined bin body 1;

[0081] The process of this part of slurry containing a small part of fine particles in chamber C and chamber D of the combined silo 1 is the same as the principle of the aforementioned "slurry mixture containing large-density particles entering chamber A and chamber B of the combined silo", the particles settle to the lower part of chamber C of the combined silo 1, slag is discharged through the secondary slag discharge pipeline 24, and is collected with the primary slag discharge pipeline 20 to the main slag discharge pipeline 25 for slag discharge; the slurry after sedimentation and overflow enters chamber D, and the treated slurry is finally discharged from the slag discharge pipeline 26 at the bottom of chamber D through the delivery pump 9;

[0082] The upper parts of chambers A and B and chambers C and D of the combined bin body 1 are provided with odor discharge interfaces 15, which can discharge the odor generated during the treatment process and pass it to an external odor removal device, while eliminating air resistance in the combined bin body 1 and maintaining smooth and stable liquid flow;

[0083] A manual valve 12 and a pipeline sight glass 11 are provided at the front and rear ends of the delivery pump 9. The manual valve 12 facilitates the inspection, maintenance and adjustment of the pump, and the pipeline sight glass 11 facilitates the observation of the material flow in the pipeline.

[0084] The processing process is connected by a PLC control system 16 with a delivery pump 9, an electric valve 10, and a liquid level controller 13 for signal feedback and control, so as to maintain the liquid level of each chamber in the combined bin body within a reasonable range, set the start and stop and timing of slag and liquid discharge, and make the processing process continuous and automated.

[0085] When the device is started, the electric valve 10 and the conveying pump 9 on the slag slurry feeding pipeline are opened, and the slag slurry enters the device to start the above-mentioned process; the conveying pumps 9 of the primary liquid discharge pipeline 21 and the slurry discharge pipeline 26 are opened successively to realize continuous slurry discharge; the electric valves 10 of the primary slag discharge pipeline 20 and the secondary slag discharge pipeline 24 are opened at regular intervals, and the conveying pump 9 of the slag discharge main pipeline 25 is also opened at regular intervals to realize regular slag discharge; the liquid level controller 13 on the upper part of the B chamber and the D chamber of the combined silo 1 transmits a signal to the PLC control system 16 when the liquid level is high, and the system controls the conveying pump 9 to start slurry discharge; the liquid level controller 13 on the lower part of the A chamber, the B chamber, the C chamber, and the D chamber of the combined silo 1 transmits a signal to the PLC control system 16 when the liquid level is low, and the system controls to stop the operation of the conveying pump 9 to avoid the combined silo 1 being empty and the conveying pump 9 idling.

[0086] Application examples:

[0087] This device was tried out in the Wanzhou food waste plant. The physical prototype of the device was installed on-site in the workshop of the Wanzhou food waste plant, and a comparative experiment was carried out with the original old sand removal device of the waste plant (a sand removal device using a combination of a primary cyclone separator and a sand-water separator) (the experimental time was September 12-14, 2022), see Tables 1 and 2 below.

[0088] Table 1 Sand removal test of the combined multi-depth sand removal device of the present invention

[0089]

[0090]

[0091] Table 2 Sand removal test of the original old sand removal device

[0092]

[0093] According to the experimental comparison results, the combined multi-depth sand removal device and process of the present invention can achieve a sand removal rate of about 98%, with a significant effect; while the sand removal rate of the original old sand removal device is only about 75%.

[0094] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A combined multi-depth sand removal device for organic waste slurry, characterized in that: It comprises a combined warehouse body (1), wherein the interior of the combined warehouse body (1) is divided into a left warehouse and a right warehouse by a partition board (4), and the left warehouse and the right warehouse are completely separated; An overflow weir plate (7) is provided in the left bin, and the overflow weir plate (7) divides the left bin into chamber A and chamber B; an overflow weir plate is provided in the right bin, and the overflow weir plate divides the right bin into chamber C and chamber D; the partition plate (4) completely isolates chamber B from chamber C; chamber A and chamber B are interconnected through the space above the overflow weir plate (7) in the left bin; chamber C and chamber D are interconnected through the space above the overflow weir plate in the right bin; A primary cyclone (2) and a secondary cyclone (3) are provided above the combined bin body (1); a lower outlet of the primary cyclone (2) is connected to a primary cyclone slag liquid pipeline (18); a lower outlet of the secondary cyclone (3) is connected to a secondary cyclone slag liquid pipeline (22); and both the primary cyclone slag liquid pipeline (18) and the secondary cyclone slag liquid pipeline (22) are connected to one side of the top of chamber A; The overflow outlet at the top of the primary cyclone (2) is connected to a primary cyclone light liquid pipeline (19), and the primary cyclone light liquid pipeline (19) is connected to the top of chamber B of the combined silo (1); the overflow outlet at the top of the secondary cyclone (3) is connected to a secondary cyclone light liquid pipeline (23), and the secondary cyclone light liquid pipeline (23) is connected to one side of the top of chamber C of the combined silo (1); The upper side feed port of the primary cyclone (2) is connected to a slag slurry feed pipeline (17), and the upper side feed port of the secondary cyclone (3) is connected to a primary liquid discharge pipeline (21) at the bottom of chamber B of the combined bin body (1); The lower outlet of the A chamber is connected to the primary slag discharge pipeline (20) through a manual valve (12), and the lower outlet of the B chamber is connected to the primary liquid discharge pipeline (21); The lower outlet of the C chamber is connected to the secondary slag discharge pipeline (24) through a manual valve (12), and the lower outlet of the D chamber is connected to the slurry discharge pipeline (26).

2. The combined multi-depth sand removal device for organic waste slurry according to claim 1 is characterized in that: A regulating valve (8) and a pressure gauge (14) are provided at the front end of the upper side feed port of the first-stage cyclone (2) and the front end of the upper side feed port of the second-stage cyclone (3).

3. The combined multi-depth sand removal device for organic waste slurry according to claim 1, characterized in that: The A chamber is provided with a slow flow settling inclined plate 1 (5) and a slow flow settling inclined plate 2 (6); the C chamber is also provided with a slow flow settling inclined plate 1 and a slow flow settling inclined plate 2.

4. The combined multi-depth sand removal device for organic waste slurry according to claim 1, characterized in that: The lower parts of the chambers A, B, C and D are all in a conical shape; The ends of the primary slag discharge pipeline (20) and the secondary slag discharge pipeline (24) are both connected to the main slag discharge pipeline (25).

5. The combined multi-depth sand removal device for organic waste slurry according to claim 1, characterized in that: A liquid level controller (13) is provided at the lower part of each of the A chamber and the C chamber; and a liquid level controller (13) is provided at the upper part and the lower part of each of the B chamber and the D chamber.

6. The combined multi-depth sand removal device for organic waste slurry according to claim 1, characterized in that: The left bin and the right bin are both provided with odor discharge interfaces (15).

7. The combined multi-depth sand removal device for organic waste slurry according to any one of claims 1 to 6, characterized in that: The slag slurry feed pipeline (17), the primary liquid discharge pipeline (21), the slag discharge main pipeline (25), and the slurry discharge pipeline (26) are all provided with a delivery pump (9), and the front end pipeline and the rear end pipeline of the delivery pump (9) are respectively provided with a pipeline sight glass (11) and a manual valve (12).

8. The combined multi-depth sand removal device for organic waste slurry according to claim 7, characterized in that: The slag slurry feed pipeline (17), the first-level slag discharge pipeline (20) and the second-level slag discharge pipeline (24) are all provided with electric valves (10); The device is connected with a delivery pump (9), an electric valve (10) and a liquid level controller (13) by a PLC control system (16) for signal feedback and control.

9. A sand removal process using the combined multi-depth sand removal device according to any one of claims 1 to 8, characterized in that: The organic waste slurry raw material enters the upper side feed port of the primary cyclone (2) from the slag slurry feed pipeline (17) through a delivery pump (9), and a regulating valve (8) is provided to adjust its opening to control the liquid inlet pressure, which is displayed on a pressure gauge (14), so that the slurry is fed at a certain pressure; After the slurry enters the side feed port in the tangential direction of the cylindrical cavity at the upper part of the primary cyclone (2), the slurry rotates in tangentially, generating a high-speed rotating flow field in the cylindrical cavity. Under the action of the rotating flow field, the particles with higher density in the slurry mixture move downward along the axial direction of the cyclone and move outward along the radial direction of the cyclone at the same time. When reaching the cone section of the cyclone, they move downward along the wall of the cyclone and are discharged from the outlet at the lower part of the cyclone to chamber A of the combined bin body (1). An outer vortex flow field is formed in the cyclone. The particles with lower density in the slurry mixture move toward the central axis of the cyclone and form an inner vortex moving upward at the center of the axis. They are then discharged from the overflow outlet at the top of the cyclone to chamber B of the combined bin body (1); The slurry mixture containing high-density particles enters chamber A of the combined silo (1), and under the slow flow, flow blocking and guiding effects formed by the combination of the slow flow settling inclined plate 1 (5) and the slow flow settling inclined plate 2 (6), most of the particles settle to the lower part of chamber A of the combined silo (1), and are discharged through the primary slag discharge pipeline (20); Another part of the slurry containing smaller particles overflows into chamber B of the combined bin body (1) through the overflow weir plate (7). The slurry entering chamber B after overflowing enters the upper side feed port of the secondary cyclone (3) through the primary discharge pipeline (21) through the delivery pump (9); The slurry entering the secondary cyclone (3) undergoes centrifugal cyclone sedimentation, and most of the smaller particles separated by the secondary cyclone (3) are returned to chamber A of the combined bin body (1) through the outlet at the bottom of the cyclone, and enter a second sedimentation separation process; The slurry containing a small portion of fine particles separated by the secondary cyclone (3) is discharged from the overflow outlet at the top of the cyclone to the chamber C of the combined bin body (1); The process of the slurry containing a small amount of fine particles in the chamber C and chamber D of the combined silo (1) is the same as the sedimentation and overflow principle of the slurry mixture containing high-density particles entering the chamber A and chamber B of the combined silo (1). The particles settle to the lower part of the chamber C of the combined silo (1), and the slag is discharged through the discharge pipeline, that is, the secondary slag discharge pipeline (24), and is collected with the primary slag discharge pipeline (20) to the main slag discharge pipeline (25) for slag discharge; the slurry after sedimentation and overflow enters the chamber D, and the treated slurry is finally discharged from the slag discharge pipeline (26) at the bottom of the chamber D through the delivery pump (9); The odor discharge interface (15) at the upper part of chambers A and B and chambers C and D of the combined bin body (1) can discharge the odor generated during the treatment process and pass it to an external odor removal device, while eliminating air blockage in the combined bin body (1); The processing process is connected by a PLC control system (16) with a delivery pump (9), an electric valve (10), and a liquid level controller (13) to perform signal feedback and control, so as to maintain the liquid level of each chamber in the combined bin body (1) within a reasonable range, set the start and stop and timing of slag discharge and liquid discharge, and make the processing process continuous and automated.

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