阅读说明：本技术 一种尿素溶液中的碎片收集装置、系统及方法 (Device, system and method for collecting fragments in urea solution ) 是由 尚桐 朱建宏 罗代强 王玉荣 邓春 郝延涛 毕凯 牟思武 潘文兴 王玉洪 刘斌 于 2021-10-27 设计创作，主要内容包括：本发明提供一种尿素溶液中的碎片收集装置、系统及方法,能够有效祛除尿素溶液中的碎片杂物,提高收集效率,实现自动清理且不会对通流面积造成过大负面影响。捕集装置包括轴向依次设置的多级捕集抓手；每级捕集抓手包括圆柱形的连接段和呈弧形设置的捕集段；捕集段的一端垂直设置在连接段末端侧壁上,另一端平行于连接段轴线并向末端延伸；每级捕集抓手的捕集段的末端分别一一对应连接下一级捕集抓手的连接段；第一级捕集抓手的连接段前端与尿素溶液管道固定连接,捕集装置中多级捕集抓手的级连方向与尿素溶液的流向相反。(The invention provides a device, a system and a method for collecting fragments in a urea solution, which can effectively remove the fragments and impurities in the urea solution, improve the collection efficiency, realize automatic cleaning and have no great negative influence on the flow area. The trapping device comprises a plurality of stages of trapping grippers which are axially and sequentially arranged; each stage of trapping gripper comprises a cylindrical connecting section and a trapping section which is arranged in an arc shape; one end of the trapping section is vertically arranged on the side wall of the tail end of the connecting section, and the other end of the trapping section is parallel to the axis of the connecting section and extends towards the tail end; the tail end of the trapping section of each stage of trapping hand grip is respectively connected with the connecting section of the next stage of trapping hand grip in a one-to-one correspondence manner; the front end of the connecting section of the first-stage trapping gripper is fixedly connected with the urea solution pipeline, and the cascade direction of the multistage trapping gripper in the trapping device is opposite to the flow direction of the urea solution.)

1. A device for collecting debris in a urea solution, characterized by comprising a trap device (4) arranged inside a urea solution conduit (9);

the trapping device (4) comprises a plurality of stages of trapping grippers which are axially and sequentially arranged; each stage of trapping gripper comprises a cylindrical connecting section and a trapping section which is arranged in an arc shape; one end of the trapping section is vertically arranged on the side wall of the tail end of the connecting section, and the other end of the trapping section is parallel to the axis of the connecting section and extends towards the tail end; the tail end of the trapping section of each stage of trapping hand grip is respectively connected with the connecting section of the next stage of trapping hand grip in a one-to-one correspondence manner;

the front end of the connecting section of the first-stage trapping hand grip is fixedly connected with a urea solution pipeline (9), and the cascade direction of the multi-stage trapping hand grip in the trapping device (4) is opposite to the flow direction of the urea solution.

2. The apparatus for collecting the debris in the urea solution as claimed in claim 1, wherein the number of the collecting sections of the collecting hand of the same stage is 4-6 times that of the connecting section, and the diameter of the collecting section of the collecting hand of the same stage is 1/2-1/6 of the connecting section.

3. The system of claim 1 wherein the diameter of the collection section of the last stage of collection fingers is in the range of 1-3 mm.

4. A system for collecting debris from a urea solution according to claim 1, characterized in that the number of trapping segments of each stage of trapping fingers is the same as the number of connecting segments of the next stage of trapping fingers.

5. A system for collecting debris from a urea solution according to claim 1, wherein the connection section of the first catching hand is a hollow pipe and extends outwards outside the urea solution pipe (9), the top end of the outer part is provided with a top cover, and the remaining catching hands of the catching device (4) are solid pipes.

6. The system of claim 1 wherein the collection sections of each stage of collection fingers are located in the circumferential direction of the same cross-section at the connection locations of the connection sections, and the end faces of the collection sections of each stage of collection fingers and the end faces of the connection sections are in the same plane.

7. A system for collecting debris in a urea solution, characterized in that two parallel branches are arranged on the urea solution pipeline, and each branch comprises a first switch control device, a debris collection device according to any one of claims 1-6 and a second switch control device which are arranged in sequence; and the inlet and the outlet of the debris collecting device are provided with pressure monitoring devices.

8. A system for collecting debris in a urea solution according to claim 7, characterized by further comprising a drain switch control device, a cleaning fluid switch control device and a drain collecting device (6);

the liquid discharge switch control device is arranged on a liquid discharge pipeline between the first switch control device and the debris collection device, and one end of the liquid discharge pipeline is connected with the liquid discharge collection device (6);

the cleaning liquid switch control device is arranged on a liquid inlet pipeline connected with the debris collecting device.

9. A method for collecting debris in a urea solution, comprising the steps of, in a debris collection system according to any one of the above 7 to 8:

starting a first switch control device and a second switch control device of a branch, and starting the fragment collection devices on the branch to collect the fragments;

the pressure monitoring device detects the pressure value of an inlet and an outlet of the fragment collecting device in real time, if the pressure difference value exceeds a preset threshold value, the first switch control device of the branch is closed, and the first switch control device and the second switch control device of the other branch are opened to complete branch switching;

the debris collecting means of the other branch continues to collect debris.

10. The method according to claim 9, further comprising an automatic cleaning step of turning off the second on/off control device of the original operating branch and turning on the cleaning solution on/off control device of the original operating branch after the branch switching is completed, and injecting the cleaning solution to start cleaning.

Technical Field

The invention belongs to the technical field of flue gas denitration treatment, and particularly relates to a device, a system and a method for collecting fragments in a urea solution.

Background

The SCR technology is widely used in the industries of thermal power, steel, coking and the like to remove nitrogen oxides in flue gas. The principle is to add a reducing agent NH₃Is introduced into the flue gas and reacts with NO in the flue gas under the action of a catalyst_xReaction to form N₂And H₂O。

The commonly used reducing agents are mainly liquid ammonia and urea, and the liquid ammonia belongs to a major hazard source, so that great hidden dangers exist in transportation, storage and use. Most power plants currently use urea as a reductant source and employ urea hydrolysis or pyrolysis techniques to produce NH₃However, in any process, urea granules are first dissolved in water to prepare a urea solution of about 50%. In the process of removing the urea granules, part of the urea woven bag fragments and the film fragments in the urea bags inevitably enter the urea dissolving tank along with the urea granules. The fragments enter downstream equipment along with the urea solution and easily block urea solution pipelines, so that great negative effects are caused on the flow area, the urea pyrolysis is particularly serious, and the denitration system is not stopped due to the blockage of the fragments in the metering module and the spray nozzle of the spray gun of the pyrolysis furnace.

The fragment material is mostly polypropylene and polyethylene, has good corrosion resistance, and can not be removed by chemical means. Although a filter screen is usually arranged in front of the urea dissolving pump, the filter screen faces the urea solution in a plane, so that the filter screen is easily blocked by fragments, impurities and the like, and in order to reduce the negative influence of the filter screen, the filter screen can only be manually adjusted to be larger or removed, and the filter screen cannot be automatically cleaned.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a device, a system and a method for collecting fragments in a urea solution, which can effectively remove the fragments and impurities in the urea solution, improve the collection efficiency, realize automatic cleaning and have no great negative influence on the flow area.

In order to achieve the purpose, the invention provides the following technical scheme:

a debris collecting device in urea solution comprises a trapping device arranged inside a urea solution pipeline;

the trapping device comprises a plurality of stages of trapping grippers which are axially and sequentially arranged; each stage of trapping gripper comprises a cylindrical connecting section and a trapping section which is arranged in an arc shape; one end of the trapping section is vertically arranged on the side wall of the tail end of the connecting section, and the other end of the trapping section is parallel to the axis of the connecting section and extends towards the tail end; the tail end of the trapping section of each stage of trapping hand grip is respectively connected with the connecting section of the next stage of trapping hand grip in a one-to-one correspondence manner;

the front end of the connecting section of the first-stage catching hand grip is fixedly connected with a urea solution pipeline, and the cascading direction of the multistage catching hand grips in the catching device is opposite to the flow direction of the urea solution.

Preferably, the number of the collecting sections of the collecting hand of the same stage is 4-6 times of that of the connecting section, and the diameter of the collecting section of the collecting hand of the same stage is 1/2-1/6 of the connecting section.

Preferably, the diameter range of the trapping section of the last stage of trapping hand is 1-3 mm.

Preferably, the connecting section of the first-stage catching hand is a hollow pipeline and extends outwards to the outside of the urea solution pipeline, a top cover is arranged at the top end of the outside, and the other catching hand of the catching device is a solid pipeline.

Preferably, the number of trapping segments of each stage of trapping fingers is the same as the number of connecting segments of the next stage of trapping fingers.

Preferably, the catching segments of each stage of catching fingers are located in the circumferential direction of the same cross section at the connecting location of the connecting segments.

Preferably, the terminal end face of the trapping section and the terminal end face of the connecting section of each stage of trapping fingers are in the same plane.

A system for collecting fragments in a urea solution is characterized in that two parallel branches are arranged on a urea solution pipeline, and each branch comprises a first switch control device, a fragment collecting device and a second switch control device which are sequentially arranged; and the inlet and the outlet of the debris collecting device are provided with pressure monitoring devices.

Preferably, the device also comprises a liquid discharge switch control device, a cleaning liquid switch control device and a liquid discharge collecting device;

the liquid discharge switch control device is arranged on a liquid discharge pipeline between the first switch control device and the fragment collecting device, and one end of the liquid discharge pipeline is connected with the liquid discharge collecting device;

the cleaning liquid switch control device is arranged on a liquid inlet pipeline connected with the debris collecting device.

A method of collecting debris in a urea solution comprising the steps of:

starting a first switch control device and a second switch control device of a branch, and starting the fragment collection devices on the branch to collect the fragments;

the pressure monitoring device detects the pressure value of an inlet and an outlet of the fragment collecting device in real time, if the pressure difference value exceeds a preset threshold value, the first switch control device of the branch is closed, and the first switch control device and the second switch control device of the other branch are opened to complete branch switching;

the debris collecting means of the other branch continues to collect debris.

Preferably, the method further comprises an automatic cleaning step, wherein after the branch switching is completed, the second switch control device of the original operation branch is closed, the cleaning liquid switch control device of the original operation branch is opened, and cleaning liquid is injected to start cleaning.

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

the invention arranges a fragment collecting device on a urea solution pipeline, which comprises a plurality of stages of trapping grippers axially and sequentially arranged, wherein the trapping structure is fixedly connected with the urea solution pipeline through the front end of a connecting section of a first stage of trapping gripper, the trapping structures are arranged step by step to form a trapping structure similar to an umbrella-shaped structure, fragments such as woven bags and the like can be trapped and hung by the trapping grippers in an umbrella-shaped manner, the arrangement direction of a trapping device 4 of the umbrella-shaped structure and the flow direction of the urea solution are reversely arranged, so that the influence of the fragments on the system resistance can be reduced, the fragment collecting device arranged in the invention is different from the traditional fragment collecting device which collects the fragments on a filter screen in a flat-laying manner, the trapping grippers of the umbrella-shaped structure can trap the fragments in a concentrated manner, the trapping rate of the fragments is obviously improved, the reverse arrangement manner has little influence on the system resistance and the urea solution, and the influence of the distribution of the fragment collecting device on the flow resistance on the urea solution pipeline can be reduced as much as possible, and effectively dispel the piece debris in the urea solution, reduce the negative effect to the open area, reduce the risk that downstream equipment blockked up.

The invention provides a fragment collecting system in a urea solution, which is characterized in that two parallel branches are arranged, the two branches can be switched at will, one branch runs, the other branch serves as an alternative scheme, when the amount of fragments carried in the urea solution is less, a single-path mode can be selected only, and the alternative branch is in a closed state; when the pressure monitoring devices arranged at the inlet and the outlet of the fragment collecting device detect that the pressure difference is overlarge, the fragment content collected by the branch fragment collecting device is large, and the branch fragment collecting device can be automatically switched to another alternative branch. Pressure monitoring devices can real-time detection move the differential pressure value around the branch road is collected, carries out the branch road at any time and switches, realizes changing on line, and the collection that carries out the piece that lasts stable need not artificially to change midway, and deNOx systems need not midway stop work, guarantees deNOx systems's continuous steady operation when improving piece collection efficiency.

The invention provides a debris collecting system, which also comprises a related device for cleaning, wherein the front pipeline and the rear pipeline of the debris collecting system are provided with a switch control device, and the state of the system between a collecting operation mode and an automatic cleaning mode is freely switched through program automatic control. And be provided with clearance liquid on-off control device, when the system was in automatic clearance mode, clearance liquid on-off control device opened the function that realizes the automatic return circuit that washes, and after the clearance was accomplished, impurity such as piece got into collection device to clearance liquid, can not influence deNOx systems's normal operating.

Further, during the clearance, earlier with the reverse spout of cleaning solution, also easily drop by the piece of hanging, adopt the mode of firing to carry out the degree of depth clearance to the braided bag piece that adheres to in the depths.

Drawings

FIG. 1 is a schematic view of the debris collection system of the present invention;

FIG. 2 is a schematic view of a debris collecting device according to an embodiment of the present invention;

FIG. 3 is a schematic view of the connection of the debris collecting device to the urea solution pipe according to the embodiment of the present invention.

In the figure, a first on-off control device 1, an upper arm first on-off control device 11, a lower arm first on-off control device 12, a liquid discharge on-off control device 2, an upper arm liquid discharge on-off control device 21, a lower arm liquid discharge on-off control device 22, a cleaning liquid on-off control device 3, an upper arm cleaning liquid on-off control device 31, a lower arm cleaning liquid on-off control device 32, a trap device 4, a 1 st stage trap gripper 401, a 2 nd stage trap gripper 402, a 3 rd stage trap gripper 403, a 4 th stage trap gripper 404, an upper arm debris collection device 41, a lower arm debris collection device 42, a second on-off control device 5, an upper arm second on-off control device 51, a lower arm second on-off control device 52, a liquid discharge collection device 6, a urea dissolving pump 7, a urea solution storage tank 8, and a urea solution pipeline 9.

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.

As shown in FIG. 2, the present invention provides a debris collecting device in urea solution, comprising

A trap device 4 disposed inside the urea solution pipe 9;

the trapping device 4 comprises a plurality of stages of trapping grippers which are sequentially arranged in the axial direction; each stage of trapping gripper comprises a cylindrical connecting section and a trapping section which is arranged in an arc shape; one end of the trapping section is vertically arranged on the side wall of the tail end of the connecting section, and the other end of the trapping section is parallel to the axis of the connecting section and extends towards the tail end; the tail end of the trapping section of each stage of trapping hand grip is respectively connected with the connecting section of the next stage of trapping hand grip in a one-to-one correspondence mode.

The front end of the connecting section of the first-stage trapping hand grip is fixedly connected with a urea solution pipeline 9, and the cascade direction of the multi-stage trapping hand grip in the trapping device 4 is opposite to the flow direction of the urea solution.

The cascade direction is a direction in which the first-stage catching hand grips are sequentially arranged in a cascade mode from the axial direction, the flow direction of the urea solution is the flow direction of the urea solution in the pipeline, and the urea solution flows to the urea solution storage tank 8 from the urea dissolving pump 7.

The invention arranges a fragment collecting device on a urea solution pipeline, as shown in figure 3, the fragment collecting device comprises a plurality of stages of trapping grippers which are sequentially arranged in the axial direction, the trapping structure is fixedly connected with the urea solution pipeline through the front end of a connecting section of a first stage of trapping gripper, the trapping structures are arranged step by step to form a trapping structure similar to an umbrella structure, fragments such as woven bags and the like can be trapped and hung by the trapping grippers in an umbrella shape, the arrangement direction of a trapping device 4 of the umbrella structure and the flow direction of the urea solution are reversely arranged, the influence of the fragments on the system resistance can be reduced, the fragment collecting device arranged in the invention is different from the traditional fragment collecting device that the fragments are collected on a filter screen in a flat spreading mode, the trapping grippers of the umbrella structure can trap in a concentrated mode, the trapping rate of the fragments is obviously improved, and the reverse arrangement mode has little influence on the system resistance and the urea solution, the influence of arranging the debris collecting device on the urea solution pipeline on the flow resistance can be reduced as much as possible, debris in the urea solution can be effectively removed, the negative influence on the flow area is reduced, and the risk of blocking downstream equipment is reduced.

The connecting section of the first-stage trapping gripper is a hollow pipeline, the dead weight of the trapping device 4 is reduced as far as possible, the trapping device extends out of the urea solution pipeline 9, a top cover is arranged at the top end of the outer part of the trapping device to prevent the urea solution from overflowing, and the rest part of the trapping device 4 is a solid pipeline.

In this embodiment, a total of 4-stage trapping grips, which are a first-stage trapping grip 401, a second-stage trapping grip 401, a third-stage trapping grip 401, and a fourth-stage trapping grip 401, are provided.

In the embodiment, the number of the collecting sections of the same-stage collecting hand grip is 4-6 times of that of the connecting section, and the diameter of the collecting section of the same-stage collecting hand grip is 1/2-1/6 of that of the connecting section.

Preferably, the catching device 4 is fixedly connected with the urea solution pipe 9 by a flange as a one-piece.

Preferably, the trapping fingers are stainless steel.

In the embodiment, the diameter range of the trapping section of the last stage of trapping hand grip is 1-3 mm.

In this embodiment, the number of trapping segments of each stage of trapping fingers is the same as the number of connecting segments of the next stage of trapping fingers.

In this embodiment, the trapping segments of each stage of trapping fingers are located in the circumferential direction of the same cross section at the connecting position of the connecting segment.

In this embodiment, the end face of the capturing section of each stage of capturing fingers and the end face of the connecting section are in the same plane.

As shown in fig. 1, a system for collecting debris in urea solution comprises two parallel branches arranged on a urea solution pipeline, wherein each branch comprises a first switch control device 11,12, a debris collection device 41,42 and a second switch control device 51, 52 which are arranged in sequence; the inlet and outlet of the fragment collecting device are provided with pressure monitoring devices, and the inlet and outlet of the fragment collecting device are provided with pressure monitoring devices.

The invention provides a fragment collecting system in a urea solution, which is characterized in that two parallel branches are arranged, the two branches can be switched at will, one branch runs, the other branch serves as an alternative scheme, when the amount of fragments carried in the urea solution is less, a single-path mode can be selected only, and the alternative branch is in a closed state; when the pressure monitoring devices arranged at the inlet and the outlet of the fragment collecting device detect that the pressure difference is overlarge, the fragment content collected by the branch fragment collecting device is large, and the branch fragment collecting device can be automatically switched to another alternative branch. Pressure monitoring devices can real-time detection move the differential pressure value around the branch road is collected, carries out the branch road at any time and switches, realizes changing on line, and the collection that carries out the piece that lasts stable need not artificially to change midway, and deNOx systems need not midway stop work, guarantees deNOx systems's continuous steady operation when improving piece collection efficiency.

In this embodiment, the debris collection device 4 is detachably connected to the urea solution pipeline.

In this embodiment, the device further comprises liquid drainage switch control devices 21 and 22, cleaning liquid switch control devices 31 and 32 and a liquid drainage collecting device 6; the liquid discharge switch control devices 21 and 22 are arranged on a liquid discharge pipeline between the first switch control devices 11 and 12 and the fragment collecting devices 41 and 42, and one end of the liquid discharge pipeline is connected with the liquid discharge collecting device 6; the cleaning fluid on-off control means 31,32 are arranged on the fluid inlet line connected to the debris collecting means 41, 42.

The fragment collecting system is provided with the automatic cleaning device on the basis of ensuring continuous and normal work of fragment collection by switching the two paths, the fragment collecting device does not need to be replaced under the condition that the blockage of the fragment collecting device is not serious or the fragment collecting function is normal, the flushing mode is adopted, the automatic cleaning is started for the originally running branch to automatically clean the trapped fragments, the operation is simple, the replacement frequency of the fragment collecting device is reduced, the cost is reduced, and the economy is higher.

The invention provides a debris collecting system, which also comprises a related device for cleaning, wherein the front pipeline and the rear pipeline of the debris collecting device 4 are provided with switch control devices 1 and 5, and the state of the system between a collecting operation mode and an automatic cleaning mode is freely switched through program automatic control. And be provided with clearance liquid on-off control device 3, when the system was in automatic clearance mode, clearance liquid on-off control device 3 opened the function that realizes the automatic return circuit that washes, and after the clearance was accomplished, impurity such as piece got into collection device to clearance liquid, can not influence deNOx systems's normal operating.

Preferably, the catching device 4 is flanged onto the urea solution line, facilitating manual removal if necessary.

A method of collecting debris in a urea solution comprising the steps of:

the first switching control means 11 and the second switching control means 51 of a branch on which the debris collecting means 41 start collecting debris are turned on;

the pressure monitoring device detects the pressure value of the inlet and outlet of the fragment collecting device 41 in real time, if the pressure difference value exceeds a preset threshold value, the first switch control device 11 of the branch is closed, and the first switch control device 12 and the second switch control device 52 of the other branch are opened to complete branch switching;

the debris collecting means 42 of the other branch continues to collect debris.

If the differential pressure value does not exceed the preset threshold value, branch switching is not needed, a one-way mode is adopted for collection, the fragment collection device 4 is cleaned after the urea dissolving pump is stopped, and normal operation of the system for releasing the pins cannot be influenced.

In this embodiment, an automatic cleaning step is further included, after the branch switching is completed, the second switch control device 52 of the original operating branch is turned off, the cleaning liquid switch control device 31 of the original operating branch is turned on, and cleaning liquid is injected to start cleaning.

In this embodiment, after the cleaning is completed, the liquid discharge switch control device 2 is turned on, and the debris collected in the debris collection device 4 is recovered to the liquid discharge collection device 6 along with the cleaning liquid.

Preferably, when cleaning, usually, cleaning fluid, such as high-pressure demineralized water, is sprayed in a reverse direction, the suspended fragments are easy to fall off, and deep cleaning is performed on the woven bag fragments attached to the deep part by adopting a burning mode.

The present invention is not limited to the preferred embodiments described above, and various other forms of debris collection devices, systems and methods can be devised by anyone in light of the present invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.