阅读说明：本技术 一种用于超临界水氧化处理高粘度物料的连续计量输送系统及控制方法 (Continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials and control method ) 是由 王树众 宋文瀚 崔成超 蒋卓航 张熠姝 李建娜 雷杰 于 2019-10-12 设计创作，主要内容包括：本发明提供一种用于超临界水氧化处理高粘度物料的连续计量输送系统及控制方法,结构巧妙,设计合理,计量精确,能够长期连续输送。所述系统,包括依次连接的物料储罐、进料输送机、一级输料单元、二级输料单元和出料输送机；一级计量输料单元包括依次连接的一级缓冲仓和一级输送机；二级计量输料单元包括并行的多条输送线路,每个输送线路包括依次连接的二级缓冲仓和二级输送机；多个二级缓冲仓进口分别与一级输送机出口相接,多个二级输送机出口分别与出料输送机进口相连；所有二级输送机的额定输送量之和等于超临界水氧化处理需求的输送量。(The invention provides a continuous metering and conveying system and a control method for supercritical water oxidation treatment of high-viscosity materials, which are ingenious in structure, reasonable in design, accurate in metering and capable of being continuously conveyed for a long time. The system comprises a material storage tank, a feeding conveyor, a primary material conveying unit, a secondary material conveying unit and a discharging conveyor which are connected in sequence; the primary metering and conveying unit comprises a primary buffer bin and a primary conveyor which are sequentially connected; the second-stage metering and conveying unit comprises a plurality of parallel conveying lines, and each conveying line comprises a second-stage buffer bin and a second-stage conveyor which are sequentially connected; the inlets of the secondary buffer bins are respectively connected with the outlets of the primary conveyors, and the outlets of the secondary conveyors are respectively connected with the inlets of the discharging conveyors; the sum of rated conveying capacity of all the secondary conveyors is equal to the conveying capacity required by the supercritical water oxidation treatment.)

1. A continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials is characterized by comprising a material storage tank (1), a feeding conveyor (2), a first-stage material conveying unit, a second-stage material conveying unit and a discharging conveyor (11) which are sequentially connected;

the primary metering and conveying unit comprises a primary buffer bin (3) and a primary conveyor (4) which are connected in sequence;

the second-stage metering and conveying unit comprises a plurality of parallel conveying lines, and each conveying line comprises a second-stage buffer bin and a second-stage conveyor which are sequentially connected; the inlets of the secondary buffer bins are respectively connected with the outlet of the primary conveyor (4), and the outlets of the secondary conveyors are respectively connected with the inlet of the discharging conveyor (11); the sum of rated conveying capacity of all the secondary conveyors is equal to the conveying capacity required by the supercritical water oxidation treatment.

2. The continuous metering and conveying system for the supercritical water oxidation treatment of the high-viscosity materials as claimed in claim 1, wherein the inlets of the primary buffer bin (3) and the secondary buffer bin are respectively provided with a feeding valve.

3. The continuous metering and conveying system for the supercritical water oxidation treatment of the high-viscosity materials as claimed in claim 2, wherein the primary buffer bin (3) and the secondary buffer bin are respectively provided with a material level control instrument; the openness of the feeding valve is interlocked with the corresponding material level control instrument respectively and is used for controlling the material level of the corresponding primary buffer bin (3) or the corresponding secondary buffer bin within a set range.

4. The continuous metering and conveying system for the supercritical water oxidation treatment of the high-viscosity materials as claimed in claim 1, wherein the outlets of the secondary buffer bins are respectively provided with a discharge valve.

5. The continuous metering and conveying system for the supercritical water oxidation treatment of the high-viscosity materials as claimed in claim 4, wherein the secondary conveyors are respectively provided with a conveying flow control instrument, and the opening degrees of the discharge valves are respectively interlocked with the corresponding conveying flow control instruments for controlling the conveying amount of the corresponding secondary conveyors within a set range.

6. A continuous metering conveying control method for supercritical water oxidation treatment of high-viscosity materials is characterized in that the system based on any one of claims 1 to 5 comprises the following steps,

step 1, closing the feeding of the second-stage metering and conveying unit, opening the feeding of the first-stage metering and conveying unit, and setting the material level of a first-stage buffer bin (3);

step 2, starting a feeding conveyor (2), conveying the materials in the material storage tank (1) to a primary buffer bin (3), starting feeding of a secondary metering material conveying unit when the material level of the primary buffer bin (3) reaches a set material level, opening corresponding secondary buffer bins in a plurality of conveying lines, and setting the material level of the secondary buffer bins;

step 3, starting a primary conveyor (4), conveying the materials in the primary buffer bin (3) to a plurality of secondary buffer bins, respectively setting the conveying capacity of the plurality of secondary conveyors when the material level of the plurality of secondary buffer bins reaches a set material level, and starting the plurality of secondary conveyors to convey the materials according to the set conveying capacity;

and 4, the materials conveyed by the plurality of secondary conveyors are converged into the discharging conveyor (11) and then output, and the system enters a normal operation state to realize continuous metering conveying of the high-viscosity materials.

7. The continuous metering and conveying control method for the supercritical water oxidation treatment of high-viscosity materials as claimed in claim 6, wherein the opening and closing of the primary metering and conveying unit and the secondary metering and conveying unit are controlled by feeding valves respectively arranged at the inlets of the primary buffer bin (3) and the secondary buffer bin; the material level corresponding to each buffer bin is set and controlled by a material level control instrument interlocked with the opening of the feeding valve.

8. The continuous metering and conveying control method for the supercritical water oxidation treatment of the high-viscosity materials as claimed in claim 6, wherein the conveying capacity of the secondary conveyor is respectively set and controlled by a conveying flow control instrument interlocked with the opening degree of the discharge valve.

9. The method as claimed in claim 6, wherein the high viscosity material is a material with viscosity of 10000-.

Technical Field

The invention belongs to the field of metering and conveying of high-viscosity materials, and particularly relates to a continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials and a control method.

Background

With the rapid development of the economic level of China and the great increase of the population, a lot of high-viscosity materials, such as sludge, silt, organic matters and other various slurries, are generated. Taking town sludge and industrial sludge as examples, according to statistics, the total output of only the two kinds of sludge is more than 7000 ten thousand tons (the water content is 80%) every year in the whole country, and the sludge is characterized by low water content and high viscosity, contains a certain proportion of salt, heavy metal, refractory toxic organic pollutants, bacteria, parasitic ova and other pathogenic organisms, has odor, and can cause serious pollution to air, water and soil at a sludge stacking position. Conventional sludge treatment methods such as concentration, dehydration, landfill, composting and the like can only carry out primary treatment on sludge and cannot realize thorough harmlessness. In addition, although the sludge incineration method can treat the sludge thoroughly, dioxin and SO are generated in the incineration process_X、NO_XAnd harmful substances such as fly ash. With the increasing emphasis on environmental protection in China, the harmless treatment and resource utilization of sludge are urgent.

Domestic and foreign researches and partial industrial practices prove that by utilizing the unique property of supercritical water (water in a special state with the temperature and the pressure respectively higher than 374.15 ℃ and 22.12 MPa), sludge organic matters completely dissolved in the supercritical water and an oxidant generate rapid and thorough homogeneous reaction, carbon elements in the organic matters are converted into carbon dioxide, most of nitrogen elements are converted into nitrogen, and elements such as chlorine, sulfur, phosphorus and the like are converted into corresponding inorganic salts, so that the thorough harmless treatment and resource utilization of the sludge are realized.

However, industrial-grade supercritical water oxidation treatment system is a continuously operated high-temperature high-pressure system, and the metering accuracy and continuity of the feeding materials are closely related to the effect of the supercritical water oxidation treatment, so that a continuous accurate metering delivery system is indispensable. However, the processed materials have high viscosity, generally 10000cp-15000cp and above, and the smooth conveying is difficult to realize by the conventional conveying method, such as pumping, so the materials are generally conveyed by a high-viscosity material conveyor. However, the high viscosity of the material can cause the material to adhere to the storage and conveying equipment such as a material storage tank and a conveyor, so that the metering is extremely inaccurate, and the adhesion time is too long, so that the material is dried, the material is blocked during conveying, and the accurate quantification and long-term continuous conveying are difficult to realize. The problem directly causes that the supercritical water oxidation technology is utilized to treat high-viscosity materials, so that the limitation is great, and the further popularization of the supercritical water oxidation technology is greatly restricted. Therefore, how to establish a continuous metering conveying system and a control method for supercritical water oxidation treatment of high-viscosity materials is very important.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a continuous metering and conveying system and a control method for supercritical water oxidation treatment of high-viscosity materials, which have the advantages of ingenious structure, reasonable design, accurate metering and long-term continuous conveying.

The invention is realized by the following technical scheme:

a continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials comprises a material storage tank, a feeding conveyor, a first-stage material conveying unit, a second-stage material conveying unit and a discharging conveyor which are sequentially connected;

the primary metering and conveying unit comprises a primary buffer bin and a primary conveyor which are sequentially connected;

the second-stage metering and conveying unit comprises a plurality of parallel conveying lines, and each conveying line comprises a second-stage buffer bin and a second-stage conveyor which are sequentially connected; the inlets of the secondary buffer bins are respectively connected with the outlets of the primary conveyors, and the outlets of the secondary conveyors are respectively connected with the inlets of the discharging conveyors; the sum of rated conveying capacity of all the secondary conveyors is equal to the conveying capacity required by the supercritical water oxidation treatment.

Preferably, the inlets of the first-stage buffer bin and the second-stage buffer bin are respectively provided with a feeding valve.

Further, a material level control instrument is respectively arranged on the first-stage buffer bin and the second-stage buffer bin; the openness of the feeding valve is interlocked with the corresponding material level control instrument respectively and is used for controlling the material level of the corresponding first-level buffer bin or the second-level buffer bin within a set range.

Preferably, the outlets of the secondary buffer bins are respectively provided with a discharging valve.

Furthermore, the second-stage conveyors are respectively provided with a conveying flow control instrument, and the opening degree of the discharge valve is respectively interlocked with the corresponding conveying flow control instruments and is used for controlling the conveying amount of the corresponding second-stage conveyors within a set range.

A continuous metering conveying control method for supercritical water oxidation treatment of high-viscosity materials comprises the following steps based on any system,

step 1, closing the feeding of a second-level metering and conveying unit, opening the feeding of a first-level metering and conveying unit, and setting the material level of a first-level buffer bin;

step 2, starting a feeding conveyor, conveying the material in the material storage tank to a primary buffer bin, starting feeding of a secondary metering material conveying unit when the material level of the primary buffer bin reaches a set material level, opening corresponding secondary buffer bins in a plurality of conveying lines, and setting the material level of the secondary buffer bins;

step 3, starting the primary conveyor, conveying the materials in the primary buffer bin to a plurality of secondary buffer bins, respectively setting the conveying capacity of the plurality of secondary conveyors when the material levels of the plurality of secondary buffer bins reach set material levels, and starting the plurality of secondary conveyors to convey according to the set conveying capacity;

and 4, the materials conveyed by the plurality of secondary conveyors are converged into the discharging conveyors and then output, and the system enters a normal operation state to realize the continuous metering conveying of the high-viscosity materials.

Preferably, the opening and closing of the first-stage metering and conveying unit and the second-stage metering and conveying unit are controlled by feeding valves respectively arranged at inlets of the first-stage buffering bin and the second-stage buffering bin; the material level corresponding to each buffer bin is set and controlled by a material level control instrument interlocked with the opening of the feeding valve.

Preferably, the conveying amount of the secondary conveyor is set and controlled by a conveying flow control instrument interlocked with the opening of the discharge valve.

Preferably, the high-viscosity material is a material with the viscosity of 10000-15000cp and above.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the invention, through the arrangement of the plurality of secondary buffer bins and the secondary conveyors, the conveying capacity of each secondary buffer bin and the corresponding secondary conveyor is greatly reduced, but the total conveying capacity is unchanged, so that the material quantity adhered to the secondary buffer bins and the secondary conveyors can be uniformly distributed to each conveyor with higher precision, the material adhering capacity of each secondary buffer bin and the corresponding secondary conveyor is greatly reduced, and even if material drying occurs in the long-term operation process, the conveying jamming is difficult to cause due to the extremely small quantity of the material, the long-term continuous conveying is realized, and the adaptability of the supercritical water oxidation treatment system to high-viscosity materials is greatly improved.

Furthermore, the feeding amount of each level of the buffer bins is controlled within a set range by controlling the opening of each independent valve in front of each buffer bin, so that the material level of each level of the buffer bins and the material level of each level of the buffer bins are always maintained within the set range in the long-term and continuous conveying process, and the problem that the feeding and discharging of each buffer bin are not matched due to different conveying amounts of each conveyor is effectively solved.

Furthermore, the discharge amount of each level of buffer bin is controlled within a set range by controlling the opening degree of each independent valve behind each second-level buffer bin, so that the problems of inaccurate metering and unstable operation of a supercritical water oxidation treatment system caused by the adhesion of materials on equipment are effectively prevented.

Drawings

FIG. 1 is a schematic diagram of the process of the present invention.

In the figure, 1-a material storage tank, 2-a feeding conveyor, 3-a first-level buffer bin, 4-a first-level conveyor, 5-a second-level buffer bin, 6-a second-level buffer bin, 7-a third-level buffer bin, 8-a first-level conveyor, 9-a second-level conveyor, 10-a third-level conveyor, 11-a discharging conveyor and 12-a subsequent processing system; a feeding valve of a V001-first-stage buffer bin 5, a feeding valve of a V002-second-stage buffer bin 6, a feeding valve of a V003-third-stage buffer bin 7, a discharging valve of a V004-first-stage buffer bin 5, a discharging valve of a V005-second-stage buffer bin 6, a discharging valve of a V006-third-stage buffer bin 7 and a feeding valve of a V007-first-stage buffer bin 3.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

According to the invention, through the arrangement of the plurality of secondary buffer bins and the secondary conveyors, under the condition that the total conveying capacity is not changed, the conveying capacity metering error of each conveyor is uniformly distributed to the conveying capacity of each conveyor with higher precision, so that the metering error is greatly reduced, the metering precision of the system is improved, and the adaptability of the supercritical water oxidation treatment system to high-viscosity materials is greatly improved.

As shown in FIG. 1, the invention relates to a continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials, which is illustrated by taking a primary buffer bin connected with three parallel secondary buffer bins in series as an example; the device comprises a material storage tank 1, a feeding conveyor 2, a primary buffer bin 3, a primary conveyor 4, a primary secondary buffer bin 5, a secondary buffer bin 6, a tertiary secondary buffer bin 7, a primary secondary conveyor 8, a secondary conveyor 9, a tertiary secondary conveyor 10 and a discharging conveyor 11; a feeding valve V001 of the first-stage buffer bin 5, a feeding valve V002 of the second-stage buffer bin 6, a feeding valve V003 of the third-stage buffer bin 7, a discharging valve V004 of the first-stage buffer bin 5, a discharging valve V005 of the second-stage buffer bin 6, a discharging valve V006 of the third-stage buffer bin 7 and a feeding valve V007 of the first-stage buffer bin 3; the output end of the discharging conveyor 11 is connected with a subsequent processing system 12.

The export of material storage tank 1 links to each other with the import of feeding conveyor 2, the export of feeding conveyor 2 passes through feed valve V007 and links to each other with 3 inlets in one-level surge bin, 3 exports in one-level surge bin link to each other with 4 imports in one-level conveyer, the export of one-level conveyer is respectively through feed valve V001, V002, V003 and No. 5 in the second grade surge bin, No. two grade surge bin 6, No. three 7 imports in the second grade surge bin link to each other, No. 5 in the second grade surge bin, No. two grade surge bin 6, 7 exports in the second grade surge bin are respectively through discharge valve V004, V005, V006 and No. 8 in the second grade conveyer, No. 9 in the second grade conveyer, No. 10 imports in the third grade conveyer link to each other, No. 8 in the second grade conveyer, No. 9 in the second grade conveyer 10 exports and links to each other with 11 imports in the discharge conveyor, 11 exports and.

The opening degrees of V001, V002 and V003 are respectively interlocked with material level control instruments LIC001, LIC002 and LIC003 of a first secondary buffer bin 5, a second secondary buffer bin 6 and a third secondary buffer bin 7, and the material levels of the first secondary buffer bin 5, the second secondary buffer bin 6 and the third secondary buffer bin 7 are respectively controlled within a set range; v004, V005 and V006 are respectively interlocked with a first-stage conveyor 8, a second-stage conveyor 9 and a third-stage conveyor 10, and conveying flow control instruments FIC004, FIC005 and FIC006 are used for controlling the conveying amount of the first-stage conveyor 8, the second-stage conveyor 9 and the third-stage conveyor 10 to be respectively in a set range; the V007 opening degree is interlocked with a material level control instrument LIC007 of the primary buffer bin 3, and the material level of the primary buffer bin 3 is controlled within a set range.

According to the invention, through the multi-stage secondary buffer and the corresponding secondary conveyor, under the condition that the total conveying amount is not changed, the conveying amount in each secondary system is reduced, so that conveying equipment with smaller rated conveying amount and higher precision can be adopted, the integral error of the system is reduced under the condition of the same required conveying amount, and the conveying precision is improved. Namely, the sum of the rated conveying capacity of all the secondary conveyors is equal to the conveying capacity required by the supercritical water oxidation treatment, and the original conveyor meeting the total rated conveying capacity is replaced to operate, so that the rated conveying capacity of a single secondary conveyor is inevitably smaller than that of the original conveyor, and the precision is higher than that of the original conveyor. For example, if the rated conveying capacity of the original conveyor is 100t/d and the precision is 90%, the loss is about 10 t/d; the rated conveying capacity of the three secondary conveyors is respectively 30t/d, 40t/d and 30t/d, the precision is respectively 94%, 92% and 94%, and then the loss is 6.8 t/d; the overall conveying precision of the system is greatly improved.

The invention relates to a control method of a continuous metering and conveying system for supercritical water oxidation treatment of high-viscosity materials, wherein before the metering and conveying system needs to be started, feeding valves V001, V002 and V003 of a first-stage buffer bin 5, a second-stage buffer bin 6 and a third-stage buffer bin 7 are closed, a feeding valve V007 of a first-stage buffer bin 3 is opened, a material level LIC7 of the first-stage buffer bin 3 is set to be in a set range, and a material level control instrument LIC007 is put into interlocking with the opening degree of the feeding valve V007 of the first-stage buffer bin 3 to control a material level LIC7 to be in the set range.

Then the feeding conveyor 2 is started to convey the materials in the material storage tank to the first-level buffer bin 3. When the material level of the first-stage buffer bin 3 reaches a set material level, the feeding valves V001, V002 and V003 of the first-stage buffer bin 5, the second-stage buffer bin 6 and the third-stage buffer bin 7 are opened, then the material levels LIC1, LIC2 and LIC3 of the first-stage buffer bin 5, the second-stage buffer bin 6 and the third-stage buffer bin 7 are set to be in a required range, and the material level control instruments LIC001, LIC002 and LIC003 are interlocked with the opening degrees of the feeding valves V001, V002 and V003 of the first-stage buffer bin 5, the second-stage buffer bin 6 and the third-stage buffer bin 7 respectively to control the material levels LIC1, LIC2 and LIC3 to be in the set range respectively.

Then starting the first-stage conveyor 4, when the material levels of the first second-stage buffer bin 5, the second-stage buffer bin 6 and the third second-stage buffer bin 7 respectively reach the set material levels, firstly, opening a discharge valve V004 of a first-stage buffer bin 5, a discharge valve V005 of a second-stage buffer bin 6 and a discharge valve V006 of a third-stage buffer bin 7, then, the first-stage conveyor 8, the second-stage conveyor 9 and the third-stage conveyor 10 are set to convey the flow control instruments FIC004, FIC005 and FIC006 to the required ranges, then the first secondary conveyor 8, the second secondary conveyor 9 and the third secondary conveyor 10 are started, the input conveying flow control instruments FIC004, FIC005 and FIC006 are interlocked with the opening degrees of the discharge valves V004, V005 and V006, the corresponding flow rates FIC4, FIC5 and FIC6 are controlled within set ranges, and the conveying amounts of the first-stage conveyor 8, the second-stage conveyor 9 and the third-stage conveyor 10 are controlled within set ranges.

The materials conveyed by the first-stage conveyor 8, the second-stage conveyor 9 and the third-stage conveyor 10 are gathered into the discharging conveyor 11 and then enter the subsequent processing system 12. From this, the system gets into normal operating condition, realizes the accurate measurement and the continuous transportation of high viscosity material. If the material level and the conveying amount are changed, the on-line setting can be realized without stopping the machine.

The primary buffer bin and the secondary buffer bin include, but are not limited to, the number shown in fig. 1, and the devices and systems with buffering and storing functions are within the scope of the patent claims. The first-level buffering bin can be connected in parallel like the second-level buffering bins in the above example, and then is connected in series with the second-level buffering bins in parallel, so that the first-level metering and conveying unit can improve conveying precision like the second-level metering and conveying unit.

The metering delivery system includes, but is not limited to, a flow control system, a weighing system, as long as the device, system for metering is within the scope of the patent claims.

Subsequent treatment systems, including but not limited to primary treatment and/or advanced treatment of supercritical water oxidation treatment systems, such as oxidation, incineration, composting, landfilling, concentration, dewatering, digestion, and the like.

The viscosity of high-viscosity materials, including but not limited to various slurries such as oil sand, oil sludge, organic matters and the like, is generally 10000-15000cp and above.

The types of valves include, but are not limited to, shut-off valves, gate valves, ball valves, and the like.

The metering and conveying system and the control method related by the invention can be reasonably and flexibly selected and configured according to local specific conditions, greatly expand the application range of the invention, ensure higher feasibility and good economy, greatly improve the adaptability of the supercritical water oxidation treatment system to high-viscosity materials, and powerfully promote the popularization and application of high-viscosity materials such as sludge, oil sludge, sand and the like in the technical field of supercritical water oxidation treatment.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention is within the protection scope of the claims of the present invention.