阅读说明：本技术 负荷智能跟踪式除雾器及方法 (Load intelligent tracking type demister and method ) 是由 谢鸿微 张轶 吴敏 韩长民 丁后亮 朱青 陈意 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种负荷智能跟踪式除雾器,包括若干个独立的除雾器单元、封堵装置、控制系统,封堵装置包括安装于除雾器单元下方的至少一个截面调节装置,以及设置于脱硫塔外部的充气装置及充气阀、抽气装置及抽气阀；截面调节装置包括安装座和气囊,安装座固定安装于除雾器支撑梁下部,气囊一端固定在安装座内,另一端能够通过安装座的开口自由伸缩；气囊的固定端通过管路分别与充气装置和抽气装置连通；各充气阀和抽气阀分别与控制系统信号连接,控制系统根据脱硫塔烟气量信息控制各充气阀和抽气阀的启闭,从而对应控制各截面调节装置的气囊体积以调节除雾器截面积。本发明能实现除雾器烟气流通截面与负荷匹配,保障除雾效率,且使用方便。(The invention relates to a load intelligent tracking type demister, which comprises a plurality of independent demister units, a plugging device and a control system, wherein the plugging device comprises at least one section adjusting device arranged below the demister units, and an inflating device, an inflating valve, an air extracting device and an air extracting valve which are arranged outside a desulfurizing tower; the section adjusting device comprises a mounting seat and an air bag, the mounting seat is fixedly mounted at the lower part of the demister supporting beam, one end of the air bag is fixed in the mounting seat, and the other end of the air bag can freely stretch and retract through an opening of the mounting seat; the fixed end of the air bag is respectively communicated with the inflating device and the air extracting device through pipelines; the charging valves and the air extraction valves are respectively in signal connection with a control system, and the control system controls the charging valves and the air extraction valves to be opened and closed according to the flue gas volume information of the desulfurizing tower, so that the air bag volumes of the section adjusting devices are correspondingly controlled to adjust the sectional area of the demister. The invention can realize the matching of the smoke flow cross section and the load of the demister, ensures the demisting efficiency and is convenient to use.)

1. A load intelligent tracking type demister comprises a plurality of independent demister units and is characterized by further comprising a plugging device, wherein the plugging device comprises at least one section adjusting device arranged below the demister units, and an inflating device, an inflating valve, an air extracting device and an air extracting valve which are arranged outside a desulfurizing tower; the section adjusting device comprises a mounting seat and an air bag, the mounting seat is fixedly mounted at the lower part of the demister supporting beam, the mounting seat is hollow, an opening is formed in one end of the mounting seat, one end of the air bag is fixed in the mounting seat, and the other end of the air bag can freely stretch and retract through the opening of the mounting seat; the fixed end of the air bag is respectively communicated with the inflation device and the air extraction device through pipelines;

the demister further comprises a control system, the inflation valves and the air extraction valves of the section adjusting devices are respectively in signal connection with the control system, and the control system controls the opening and closing of the inflation valves and the air extraction valves according to the flue gas volume information of the desulfurizing tower, so that the air bag volumes of the section adjusting devices are correspondingly controlled to adjust the sectional area of the demister.

2. The demister for load intelligent tracking according to claim 1, wherein the number and installation positions of the section adjusting devices are determined according to the simulation result of uniform distribution of gas flow, different flue gas volume working conditions are simulated by a CFD flow field simulation method, positions needing to be blocked under different flue gas volume working conditions are found under the condition that the speed in the demister channel is optimal, and the section adjusting devices are installed at all corresponding positions.

3. The demister as claimed in claim 1, wherein the pipeline comprises an air charging and exhausting main pipe, one end of the air charging and exhausting main pipe is connected to the mounting seat and communicated with the inside of the air bag, and the other end of the air charging and exhausting main pipe penetrates through the wall of the desulfurizing tower and is divided into an air charging branch pipeline and an air exhausting branch pipeline which are respectively connected with the air charging device and the air exhausting device; the inflation valve is arranged on the inflation branch pipeline, and the exhaust valve is arranged on the exhaust branch pipeline.

4. The demister as set forth in claim 1, wherein when said air bag is in an inflated state, a free end extends outside said mounting seat to adjust a fluid passage cross section; when the air bag is in a folded state, the air bag is integrally contracted inside the mounting seat.

5. The load intelligent tracking mist eliminator of claim 1 wherein said maximum area of said bladder in an inflated condition is no greater than the cross-sectional area of the fluid passageway.

6. The demister for intelligent load tracking according to claim 1, wherein the structural style of said air bag is selected from the following three types:

(1) the air bag is made of elastic material with elasticity;

(2) the air bag comprises a flexible material and an elastic material covering the surface of the flexible material;

(3) the gasbag includes flexible material and installs in the elastic component in the flexible material, the stiff end and the free end of gasbag are connected respectively to elastic component both ends.

7. The demister as set forth in claim 1, wherein said air charging device is an air tank or a blower.

8. The load intelligent tracking mist eliminator of claim 1 wherein said air extractor is an air extractor.

9. A defogging method for intelligently tracking a load, which is characterized by using the defogger for intelligently tracking a load according to any one of claims 1 to 8, wherein the defogging method comprises the following steps:

s1, determining a flue gas volume range corresponding to the blocking of the demister unit: according to the flue gas volume entering the desulfurizing tower and the characteristics of a demister unit, determining the number and the positions of regulating devices needing to be blocked corresponding to different flue gas volume ranges by adopting a CFD flow field simulation method under the condition of optimal speed in a demister channel, and writing the rules of a specific regulating device which is opened and closed corresponding to the flue gas volume ranges into a DCS control system;

s2, when the demister works, the DCS control system collects the flue gas volume information entering the desulfurizing tower, and opens or closes the corresponding air bag according to the rule set in S1;

and S3, the DCS control system continuously obtains the amount of the flue gas entering the desulfurizing tower, and determines whether to continuously open or block the air bag according to the amount of the flue gas.

10. The method of claim 9, wherein when a demister unit of a zone needs to be flushed, the demister unit of the zone is plugged for offline flushing.

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a load intelligent tracking type demister and a method.

Background

Coal-fired power generation is the cleanest way of coal resource utilization in China, and the most correct choice is to concentrate the use of coal on electric coal. According to the current technical development situation, the international energy agency sets the pollutant emission targets of coal-fired power plants in 2020 and 2030, wherein the target in 2020 is as follows: the particles are 1-2 mg/m³，NO_xIs 30mg/m³，SO_xIs 25mg/m³(ii) a Target in 2030: smoke dust less than 1mg/m³，NO_x＜10mg/m³，SO_x＜10mg/m³。

Based on the above objects, part of domestic coal-fired power plants have already developed demonstration engineering construction and explored to realize that the particulate matters are less than 1mg/m³，NO_x＜10mg/m³，SO_x＜10mg/m³The process route and the device with ultra-low emission indexes.

Part of the soot is present in the form of dissolved and suspended matter in the droplets contained in the exhaust fumes, so that < 1mg/m of soot is to be achieved³The mist eliminator is a device for reducing the mist in the flue gas.

The demister is a device for removing liquid drops in flue gas passing through a channel of the demister by utilizing inertia force, and the principle is that fog drops in the flue gas impact blades of the demister at a certain speed and then are adhered to the blades of the demister to realize gas-liquid separation, and the fog drops adhered to a certain thickness flow back to a desulfurizing tower in the form of accumulated liquid. The speed of liquid drop comes from the flue gas through the defroster passageway, and flue gas velocity is crossed lowly, does not form the impact to the defroster blade formation, and the liquid drop is followed the flue gas and is escaped the defroster, and flue gas velocity is too high, and the liquid drop is carried the defroster by high-speed flue gas secretly again, forms the secondary and carries, and consequently the flue gas velocity through the defroster has a suitable scope. And the shape and the channel width of the demister are determined once, the clear area of the demister channel is determined, the flue gas speed in the channel is a linear function of the flue gas volume entering the desulfurizing tower, the boiler load is changed once, the flue gas volume entering the desulfurizing tower is changed along with the change, when the boiler load is changed greatly, the optimal performance of the mounted demister is exceeded, the concentration of discharged fog drops is excessive, and finally the concentration of particulate matters discharged from the desulfurizing tower exceeds the standard.

In order to ensure that the performance of the demister is optimal, a device for adjusting the section of the demister is needed, and the flow velocity of flue gas in the demister is adjusted by adopting a baffle at present domestically. Chinese patent CN105056637A discloses a load adjusting method and device for cyclone dust and mist eliminator, which comprises an actuating mechanism, a transmission mechanism, a baffle plate and a zone dividing cylinder. The actuating mechanism drives the baffle plate to rotate through the transmission mechanism, so that the opening and the closing of the area dividing cylinder are controlled. The thinking of above-mentioned patent technique is through adopting the partial flow area of baffle shutoff defroster to change the wind speed in the defroster passageway. This approach can achieve demister flow rate adjustment, but has the following problems:

1) the environment in the desulfurizing tower is bad, and the rotary mechanical structure causes that the maintenance work load is big.

2) The fixed channel of part can only be adjusted, can not arrange below all defroster, cause local air current equipartition in the tower, and then influence the efficiency of defroster and desulfurizing tower.

3) When the diameter of the desulfurizing tower is large, the supporting beam of the mechanism deforms greatly, the concentricity deviation of the rotating shaft is increased, and the failure rate of the rotating baffle is high.

4) Only the cross section of the fixed area can be blocked.

5) The heavy mechanical baffle and the supporting structure thereof increase the bearing load of the demister supporting beam, and the specification of the demister supporting beam needs to be increased, so that the cost is greatly increased.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides a load intelligent tracking type demister and a method.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a load intelligent tracking type demister comprises a plurality of independent demister units and a plugging device, wherein the plugging device comprises at least one section adjusting device arranged below the demister units, and an inflating device, an inflating valve, an air extracting device and an air extracting valve which are arranged outside a desulfurizing tower; the section adjusting device comprises a mounting seat and an air bag, the mounting seat is fixedly mounted at the lower part of the demister supporting beam, the mounting seat is hollow, an opening is formed in one end of the mounting seat, one end of the air bag is fixed in the mounting seat, and the other end of the air bag can freely stretch and retract through the opening of the mounting seat; the fixed end of the air bag is respectively communicated with the inflation device and the air extraction device through pipelines;

the demister further comprises a control system, the inflation valves and the air extraction valves of the section adjusting devices are respectively in signal connection with the control system, and the control system controls the opening and closing of the inflation valves and the air extraction valves according to the flue gas volume information of the desulfurizing tower, so that the air bag volumes of the section adjusting devices are correspondingly controlled to adjust the sectional area of the demister.

In the scheme, the number and the installation positions of the section adjusting devices are determined according to the simulation result of the uniform distribution of the airflow, the CFD flow field simulation method is adopted to simulate different flue gas volume working conditions, the positions needing to be blocked under the different flue gas volume working conditions are found under the condition that the speed in the demister channel is optimal, and the section adjusting devices are installed at all corresponding positions.

In the scheme, the pipeline comprises a charging and exhausting main pipe, one end of the charging and exhausting main pipe is connected to the mounting seat and communicated with the inside of the air bag, and the other end of the charging and exhausting main pipe penetrates through the wall of the desulfurizing tower and is divided into a charging branch pipeline and an exhausting branch pipeline which are respectively connected with the charging device and the exhausting device; the inflation valve is arranged on the inflation branch pipeline, and the exhaust valve is arranged on the exhaust branch pipeline.

In the above scheme, when the air bag is in an inflated state, the free end extends out of the mounting seat to adjust the cross section of the fluid channel; when the air bag is in a folded state, the air bag is integrally contracted inside the mounting seat.

In the above scheme, the maximum area of the inflated state of the air bag is not larger than the sectional area of the fluid channel.

In the above scheme, the structural style of the airbag is selected from the following three types:

(1) the air bag is made of elastic material with elasticity;

(2) the air bag comprises a flexible material and an elastic material covering the surface of the flexible material;

(3) the gasbag includes flexible material and installs in the elastic component in the flexible material, the stiff end and the free end of gasbag are connected respectively to elastic component both ends.

In the above scheme, the inflation device is an air storage tank or an air blower.

In the above scheme, the air extraction device is an air extractor.

Correspondingly, the invention also provides a load intelligent tracking type defogging method, which adopts the load intelligent tracking type defogger and comprises the following steps:

s1, determining a flue gas volume range corresponding to the blocking of the demister unit: according to the flue gas volume entering the desulfurizing tower and the characteristics of a demister unit, determining the number and the positions of regulating devices needing to be blocked corresponding to different flue gas volume ranges by adopting a CFD flow field simulation method under the condition of optimal speed in a demister channel, and writing the rules of a specific regulating device which is opened and closed corresponding to the flue gas volume ranges into a DCS control system;

s2, when the demister works, the DCS control system collects the flue gas volume information entering the desulfurizing tower, and opens or closes the corresponding air bag according to the rule set in S1;

and S3, the DCS control system continuously obtains the amount of the flue gas entering the desulfurizing tower, and determines whether to continuously open or block the air bag according to the amount of the flue gas.

In the method, when the demister unit of a certain area needs to be washed, the demister unit of the area is blocked to carry out off-line washing.

The invention has the beneficial effects that:

1. the invention utilizes the increase and decrease of the volume of the air bag caused by the air bag inflation and exhaust, thereby shielding part of the demister units to adjust the flow section of the flue gas, further adjusting the flow velocity of the flue gas in the demister channel and being convenient to use. The invention can realize the matching of the smoke flow cross section of the demister and the load and ensure the demisting efficiency.

2. The invention has no rotating device, achieves the purpose of adjustment only by the contraction and expansion of the air bag, and has small construction difficulty and very convenient maintenance.

3. The section adjusting device can be arranged at any position below a demister beam in the desulfurizing tower, can cover any place of the desulfurizing tower, can be arranged singly or in a connected manner, and cannot cause poor air flow uniform distribution in the desulfurizing tower.

4. The device has extremely small weight, basically does not increase the bearing capacity of the demister beam, and does not increase the cost of the demister supporting beam.

5. After the device is installed, the demister in a certain area can be blocked, and then the demister in the area is washed off line, so that the increase of fog drop concentration emission during washing is avoided.

6. The device automatically adjusts the closed and blocked demister units according to the amount of flue gas, and realizes intelligent control. The invention can adapt to any load and realize ultra-low emission of flue gas.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of the installation of the intelligent load tracking demister inside a desulfurization tower according to the present invention;

FIG. 2 is a schematic view of the installation of the intelligent load tracking demister outside the desulfurization tower according to the present invention;

FIG. 3 is a schematic view of a first embodiment of a cross-sectional adjustment device in an inflated state;

FIG. 4 is a schematic view of a second embodiment of the cross-sectional adjustment device in an inflated state;

FIG. 5 is a schematic view of a third embodiment of the cross-sectional adjustment device in an inflated state;

fig. 6 is a schematic view of the cross-sectional adjusting apparatus in a folded state.

In the figure: 10. a demister unit; 20. a section adjusting device; 21. a mounting seat; 22. an air bag; 221. an elastic material; 222. a flexible material; 223. an elastic member; 30. an inflator; 40. an air extraction device; 51. a charging and exhausting main pipe; 52. an inflation branch line; 53. branch air-extracting pipelines; 61. an inflation valve; 62. an air extraction valve.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-2, the demister for load intelligent tracking provided by the present invention includes a plurality of independent demister units 10, and further includes a plugging device, where the plugging device includes at least one section adjusting device 20 installed below the demister unit 10, and an air charging device 30 and an air charging valve 61, an air discharging device 40 and an air discharging valve 62 which are arranged outside the desulfurization tower. The section adjusting device 20 comprises an installation seat 21 and an air bag 22, the installation seat 21 is fixedly installed at the lower part of the demister supporting beam, the installation seat 21 is hollow, an opening is formed in one end of the installation seat 21, one end of the air bag 22 is fixed in the installation seat 21, and the other end of the air bag can freely stretch and retract through the opening of the installation seat 21. The fixed end of the air bag 22 is respectively communicated with the inflating device 30 and the air extracting device 40 through pipelines. The demister further comprises a control system, the inflation valve 61 and the extraction valve 62 are respectively in signal connection with the control system, and the control system controls the opening and closing of each inflation valve 61 and the extraction valve 62 according to the flue gas volume information of the desulfurizing tower, so that the volume of the air bag 22 of each section adjusting device 20 is correspondingly controlled to adjust the sectional area of the demister.

The invention utilizes the increase and decrease of the volume of the air bag caused by the air bag inflation and exhaust, thereby shielding part of the demister units to adjust the flow section of the flue gas, further adjusting the flow velocity of the flue gas in the demister channel and being convenient to use. The invention can realize the matching of the smoke flow cross section of the demister and the load and ensure the demisting efficiency.

Further optimizing, the number and the installation positions of the section adjusting devices 20 are determined according to the simulation result of the uniform distribution of the airflow, different flue gas volume working conditions are simulated by adopting a CFD flow field simulation method, under the condition that the speed in the demister channel is optimal, the positions needing to be blocked under the different flue gas volume working conditions are found, and the section adjusting devices 20 are installed at all corresponding positions.

Further preferably, the pipeline comprises an inflation and suction manifold 51, one end of the inflation and suction manifold 51 is connected to the mounting seat 21 and communicated with the interior of the airbag 22, and the other end of the inflation and suction manifold 51 penetrates through the wall of the desulfurization tower and is divided into an inflation branch pipeline 52 and a suction branch pipeline 53 which are respectively connected with the inflation device 30 and the suction device 40; the inflation valve 61 is provided on the inflation branch line 52, and the suction valve 62 is provided on the suction branch line 53.

Further preferably, when the air bag 22 is in an inflated state, the free end extends out of the mounting seat 21 to adjust the cross section of the fluid passage; when the air bag 22 is in a folded state, the air bag 22 is integrally contracted inside the mounting seat 21, so that the flushing of fluid is avoided, and the service life is prolonged. The structural form of the balloon 22 is selected from three types:

(1) the balloon 22 is made of elastic material having elasticity, as shown in fig. 3. When air is pumped out, the air bag automatically contracts under the action of the resilience force of the elastic material.

(2) The balloon 22 includes a flexible material 222 and an elastic material 221 covering the surface of the flexible material 222, as shown in fig. 4. When air is pumped out, the air bag automatically contracts under the action of the resilience force of the elastic material.

(3) The airbag 22 includes a flexible material 222 and an elastic member 223 mounted in the flexible material 222, and both ends of the elastic member 223 are respectively connected to a fixed end and a free end of the airbag 22, as shown in fig. 5. When air is pumped out, the air bag automatically contracts under the action of the resilience force of the elastic piece.

Further preferably, the maximum area of the inflated state of the bladder 22 is no greater than the cross-sectional area of the fluid passageway.

Preferably, the air charging device 30 is an air storage tank or a blower.

Preferably, the air extracting device 40 is an air extractor.

Correspondingly, the invention also provides a load intelligent tracking type defogging method, which comprises the following steps:

s1, determining a flue gas amount range corresponding to the blockage of the demister unit 10: according to the flue gas volume entering the desulfurizing tower and the characteristics of the demister unit 10, the number and the positions of the adjusting devices needing to be blocked corresponding to different flue gas volume ranges are determined by adopting a CFD flow field simulation method under the condition that the speed in a demister channel is optimal, and the rules of the specific adjusting devices which are opened and closed corresponding to the flue gas volume ranges are written into the DCS control system.

And S2, when the demister works, the DCS control system collects the flue gas volume information entering the desulfurizing tower, and opens or closes the corresponding air bags 22 according to the rules set in the S1.

S3, the DCS control system continuously obtains the amount of the flue gas entering the desulfurizing tower, and whether to continuously open or close the air bag 22 is determined according to the amount of the flue gas.

And S4, when the demister units 10 of a certain area need to be washed, plugging the demister units 10 of the area to carry out off-line washing.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.