CN102944450A

CN102944450A - System and method for absorbing heavy metal particles in flue gas

Info

Publication number: CN102944450A
Application number: CN2012104874903A
Authority: CN
Inventors: 刘德华; 邹雄伟; 陈星�; 严浩; 王本腊; 李军; 杨军
Original assignee: Lihe Technology Hunan Co Ltd
Current assignee: Lihe Technology Hunan Co Ltd
Priority date: 2012-11-26
Filing date: 2012-11-26
Publication date: 2013-02-27

Abstract

The invention relates to the field of environment detection, in particular to a system and a method for absorbing heavy metal particles in flue gas. The system for absorbing the heavy metal particles in the flue gas comprises a processor, a sampling device and an absorbing device. The sampling device collects flue gas emitted by a flue gas emission pipeline after receiving a sampling starting instruction transmitted by the processor, the flue gas is transmitted to the absorbing device, the absorbing device comprises an absorbing bottle containing absorbing liquid, the absorbing liquid and the heavy metal particles in the flue gas are physically adsorbed and chemically digested after the absorbing device receives the flue gas, so that the heavy metal particles can be sufficiently absorbed, collecting effects of the heavy metal particles are improved, and precision of subsequently detecting the concentration of the heavy metal particles in the flue gas is correspondingly improved.

Description

System and method for absorbing heavy metal particles in flue gas

Technical Field

The invention relates to the field of environmental detection, in particular to a system and a method for absorbing heavy metal particles in flue gas.

Background

The industrial flue gas is a mixture of gas and smoke dust, is the main reason for polluting the atmosphere of residential areas, has complex components and comprises SO₂、CO、CO₂And hydrocarbons, nitrogen oxides, heavy metal particles, and the like. The heavy metal is a metal having a relative density of 5 or more, and includes copper, lead, zinc, tin, and the like.

In order to purify the environment and treat the industrial flue gas, the content and the type of heavy metal particles in the industrial flue gas need to be known, and therefore, the heavy metals in the industrial flue gas need to be collected. When the existing flue gas heavy metal particulate matter collecting device collects heavy metal particulate matters, most of the devices in the figure 1 are adopted, and the collection of the heavy metal particulate matters is realized by a method of filter membrane enrichment. The heavy metal particulate collection device in fig. 1 includes: a flue gas transmission pipeline 101, a filter membrane rotating shaft 102, a filter membrane 103 and an XRF (X ray fluorescence spectroscopy) analyzer 104. When heavy metal particles are collected, under the power action of a sampling pump, smoke containing the heavy metal particles is transmitted through the smoke transmission pipeline 101, and the filter membrane rotating shaft 102 moves from left to right, so that the filter membrane 3 is driven to move along with the movement. When the smoke passes through the filter membrane 103, the particles with the diameter larger than the pore size of the filter membrane are intercepted and attached to the filter membrane. After a single sampling period is completed, the filter membrane shaft 102 rotates, so that the part of the filter membrane, which adsorbs large-aperture particulate matters, moves to the XRF analyzer 104, the XRF analyzer 104 analyzes the large-aperture particulate matters, and information such as the types of heavy metals contained in the large-aperture particulate matters is acquired.

However, the inventor finds that the heavy metal particulate matter collecting device used in the prior art absorbs heavy metal in a manner of enrichment by using a filter membrane, but the limitation of the aperture of the filter membrane is large, so that the gas in the flue gas can pass through the filter membrane well and can completely absorb the heavy metal particulate matter, and the existing filter membrane can hardly meet the requirement. For example, most of the existing collecting devices adopt a filter membrane with a pore size of 0.5um, and particulate matters with the diameter less than 0.5un are difficult to absorb, so that a large absorption error is caused, but if the filter membrane with a small pore size is adopted, the filter membrane is easy to block and cannot be collected, so that the collection of heavy metal particulate matters is influenced; in addition, when the heavy metal particles are collected by adopting a filter membrane enrichment method, the particles attached to the filter membrane are gradually increased along with the increase of time, so that the resistance of the gas passing through the filter membrane is increased, and the system is difficult to achieve equal-flow-rate sampling; moreover, after each sampling period, the filter membrane is shifted to the XRF analyzer in a mechanical transmission mode to be detected, and in the moving process, the filter membrane is easy to cause the falling of particles on the filter membrane due to the vibration or the influence of unstable airflow, so that sampling errors are caused, and the subsequent detection precision is influenced. Therefore, the heavy metal particulate matter collection device among the prior art has the problem that the collection effect is poor, the detection precision is low.

Disclosure of Invention

In view of this, the invention aims to provide a flue gas heavy metal particulate matter absorption system, so as to solve the problems of poor collection effect and low detection precision when absorbing heavy metal particulate matters in flue gas in the prior art, and the specific implementation scheme is as follows:

a flue gas heavy metal particulate matter absorption system includes:

a processor including a first sub-processor that translates into corresponding control instructions based on received input operations, the control instructions including at least: starting a sampling instruction;

the sampling device is connected with the processor, is inserted in the smoke discharge pipeline, and collects smoke discharged by the smoke discharge pipeline after receiving a sampling starting instruction transmitted by the processor;

the absorption device comprises absorption liquid, is connected with the sampling device, receives the smoke transmitted by the sampling device, and absorbs the heavy metal particles in the smoke through the absorption liquid.

Preferably, the first and second liquid crystal materials are,

the processor further comprises: the second sub-processor is used for generating a back purging instruction every preset time period after the sampling starting instruction is generated;

flue gas heavy metal particulate matter absorption system still includes:

and the back flushing device is connected with the processor, arranged between the sampling device and the absorption device, respectively connected with the sampling device and the absorption device, and used for blowing compressed air into the absorption device from the position of the sampling device after receiving the back flushing instruction.

Preferably, the flue gas heavy metal particulate matter absorption system further includes:

the sampling temperature and pressure flow detection device is connected with the flue gas discharge pipeline in parallel in an inserted mode and used for detecting a differential pressure value and a temperature value;

the temperature and pressure detection device is connected with the absorption device and used for detecting the temperature value, the pressure value and the flow velocity value of the waste gas flowing through the absorption device;

the single chip microcomputer is connected with the sampling site temperature and pressure flow detection device and the absorbed temperature and pressure flow detection device, acquires constant-speed tracking flow at the sampling device according to the differential pressure value and the temperature value obtained from the sampling site temperature and pressure flow detection device, acquires the sampling speed of the waste gas flowing through the absorption device according to the temperature value, the pressure value and the flow speed value obtained from the absorbed temperature and pressure flow detection device, and generates a corresponding air pump control instruction according to the comparison result of the constant-speed tracking flow and the sampling flow corresponding to the sampling speed;

the air pump is connected with the single chip microcomputer and the absorbed temperature and pressure flow detection device and discharges waste gas passing through the absorbed temperature and pressure flow detection device, and after receiving the air pump control instruction transmitted by the single chip microcomputer, the air pump correspondingly adjusts the air pumping flow according to the air pump control instruction so as to enable the constant-speed tracking flow to be equal to the sampling flow corresponding to the sampling speed.

Preferably, the processor further comprises:

a third sub-processor for generating an absorption liquid addition instruction and an absorption liquid discharge instruction every a preset time period;

flue gas heavy metal particulate matter absorption system still includes:

an absorption liquid adding pump for extracting the pre-stored absorption liquid and adding the absorption liquid to the absorption bottle after receiving the absorption liquid adding instruction;

and the absorption liquid discharge valve is connected with the bottom of the absorption bottle, is in a closed state after receiving the absorption liquid adding instruction, so that the absorption bottle receives the absorption liquid added by the absorption liquid adding pump, and is in an open state after receiving the absorption liquid discharging instruction, so that the absorption liquid in the absorption bottle is discharged.

the constant volume bottle sample injection valve is connected with the absorption liquid discharge valve and is in an open state after receiving the absorption liquid discharge instruction;

and the constant volume device is connected with the constant volume bottle sample injection valve, receives the absorption liquid discharged by the absorption bottle, detects the liquid level of the absorption liquid and performs corresponding constant volume operation on the received absorption liquid.

Preferably, the processor further comprises:

a fourth sub-processor which generates a titration starting instruction when the liquid level is lower than a preset value according to the detection result of the constant volume device, and generates a titration ending instruction when the liquid level reaches the preset value;

the constant volume device comprises:

the constant volume bottle is connected with the constant volume bottle sample injection valve and is used for receiving the absorption liquid discharged by the absorption bottle;

the liquid level detector is arranged on the bottle wall of the constant volume bottle, generates a liquid level signal when the absorption liquid in the constant volume bottle reaches a preset liquid level, and transmits the liquid level signal to the fourth subprocessor so that the fourth subprocessor can obtain that the liquid level reaches the preset value according to the liquid level signal;

the titration pump is arranged above the constant volume bottle, titrates the purified water into the constant volume bottle after receiving the titration starting instruction, and finishes the titration operation after receiving the titration finishing instruction.

Preferably, the processor further comprises:

a fifth sub-processor for generating a waste liquid discharge command after a preset time period has elapsed after the generation of the titration end command;

flue gas heavy metal particulate matter absorption system still includes:

and the constant volume bottle discharge valve is connected with the bottom of the constant volume bottle, and is in an open state after receiving the waste liquid discharge instruction transmitted by the fifth sub-processor so as to discharge the absorption liquid in the constant volume bottle.

Preferably, the processor further comprises:

a sixth sub-processor for generating an absorption bottle cleaning instruction after a preset time period after the waste liquid discharge instruction is generated;

flue gas heavy metal particulate matter absorption system still includes:

and the cleaning liquid adding pump is connected with the absorption bottle, extracts the pre-stored cleaning liquid after receiving the cleaning instruction of the absorption bottle, and adds the cleaning liquid to the absorption bottle.

a cooling tank for placing the absorption device;

the temperature sensor is arranged on the inner wall of the cooling tank, senses the temperature in the cooling tank and generates a corresponding temperature value according to the temperature;

the temperature controller is connected with the temperature sensor, receives the temperature value transmitted by the temperature sensor and generates a corresponding temperature adjusting instruction when the temperature value does not meet a preset value;

and the temperature regulator is connected with the temperature controller and the cooling tank, and executes corresponding temperature regulation operation after receiving the temperature regulation instruction transmitted by the temperature controller.

with the treater is connected, produces host computer control command's host computer, the host computer will host computer control command transmits to the treater, by the treater will host computer control command transmits to corresponding device to make receive the device execution of host computer control command with the operation that host computer control command corresponds, host computer control command includes at least: the sample instruction is started.

Correspondingly, the invention also discloses a method for absorbing heavy metal particles in flue gas, which comprises the following steps:

generating a corresponding sampling starting instruction according to the received sampling starting operation;

after the sampling starting instruction is generated, collecting the flue gas discharged by a flue gas discharge pipeline;

and transmitting the collected flue gas to an absorption device, and absorbing heavy metal particles in the flue gas by absorption liquid in the absorption device.

Above-mentioned disclosed flue gas heavy metal particulate matter absorption system, including treater, sampling device and absorbing device, receiving behind the beginning sampling instruction of treater transmission, sampling device can gather the flue gas that the fume emission pipeline discharged, and with the flue gas transmission extremely absorbing device, absorbing device is including containing the absorption liquid absorption bottle, receiving behind the flue gas, the heavy metal particulate matter in absorption liquid and the flue gas carries out physical adsorption and chemical digestion to absorption that can be abundant the heavy metal particulate matter has improved the collection effect of heavy metal particulate matter, corresponding improvement follow-up detection precision that detects to heavy metal particulate matter concentration in the flue gas.

On the other hand, the disclosed flue gas heavy metal particulate matter absorption system of this scheme includes that absorption liquid adds pump and absorption liquid discharge valve to the treater can produce absorption liquid respectively at every predetermined time quantum and add instruction and absorption liquid discharge instruction, absorption liquid adds the pump and is receiving absorption liquid adds the instruction back, extracts the absorption liquid, and transmit extremely in the absorption bottle, so that the absorption bottle absorbs the heavy metal granule in the flue gas. And after receiving the absorption liquid discharging instruction, the absorption liquid discharging valve is opened to discharge the absorption liquid in the absorption device, so that the absorption liquid in the absorption device is automatically replaced. Through the flue gas heavy metal particulate matter absorption system disclosed by the scheme, only a worker needs to operate the processor, so that the absorption liquid in the absorption device can be added and discharged, the automation degree of the absorption liquid replacement is improved, and the absorption process of the heavy metal particulate matter is simpler and more convenient.

In addition, the flue gas heavy metal particulate matter absorption system disclosed by the invention can sense the temperature in the cooling tank through the temperature sensor, and when the temperature value in the cooling tank does not accord with a preset value, the temperature regulator is used for executing the temperature regulation operation, so that the cooling tank can keep constant temperature. In the process, manual operation is not needed, the temperature control mode is simple, the temperature control effect is stable, and the absorption effect of heavy metal particles in the flue gas is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a device for collecting heavy metal particles in flue gas in the prior art;

FIG. 2 is a flue gas heavy metal particulate absorption system disclosed in an embodiment of the present invention;

FIG. 3 is a schematic view of another system for absorbing heavy metal particles in flue gas, according to an embodiment of the present invention;

FIG. 4 is a schematic view of another system for absorbing heavy metal particles in flue gas, according to an embodiment of the present invention;

FIG. 5 is a schematic view of another embodiment of a system for absorbing heavy metal particles from flue gas;

FIG. 6 is a schematic view of another system for absorbing heavy metal particles in flue gas, according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another system for absorbing heavy metal particles in flue gas according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

the invention discloses a flue gas heavy metal particulate matter absorption system, which is shown in a schematic structural diagram of fig. 2 and comprises: a processor 1, a sampling device 2 and an absorption device 3, wherein,

the processor 1 comprises a first sub-processor, which is used for converting a received input operation into a corresponding control instruction, wherein the control instruction at least comprises: starting a sampling instruction; in addition, the processor can also generate a sampling ending instruction according to the operation of a worker so as to control the operation of ending the sampling. The processor 1 is usually a Programmable Logic Controller (PLC), but may be other types of processors, and the invention is not limited thereto. The worker can set a certain sampling period by operating the processor 1, so that the processor 1 generates a sampling start instruction every other preset time, or generates a corresponding sampling start instruction after receiving input operation of the worker every time.

The sampling device 2 is connected with the processor 1 and is inserted into the flue gas discharge pipeline, and the sampling device 1 is used for collecting the flue gas discharged by the flue gas discharge pipeline after receiving a sampling starting instruction transmitted by the processor 1. The sampling device 2 generally comprises a sampling head, which, after absorbing the flue gas emitted by the flue gas emission pipeline, transmits the flue gas into the absorption device 3. In the flue gas, a large amount of impurities are generally mixed, so that the sampling head adopted by the invention is provided with a plurality of filter holes to filter out large-particle impurities in the flue gas, and when the sampling head is specifically applied, the diameter of each filter hole is generally 50um, or the sampling head with filter holes of other sizes is selected according to different situations.

The absorption device 3 comprises an absorption bottle containing absorption liquid, and the absorption bottle is connected with the sampling device 2 and used for receiving the flue gas transmitted by the sampling device 2 and absorbing heavy metal particles in the flue gas through the absorption liquid. In order to be able to sufficiently absorb the heavy metal particles, the absorption bottle generally comprises at least a primary absorption bottle and a secondary absorption bottle connected with the primary absorption bottle. After the flue gas passes through sampling device 2, at first get into the first order absorption bottle, after the flue gas flows through the first order absorption bottle, flow into the second grade absorption bottle again, carry out the absorption of second time, the absorption liquid in the absorption bottle generally chooses for use acidic solution, can take place physical adsorption and chemical digestion reaction with the heavy metal particulate matter in the flue gas to the heavy metal particulate matter in the absorption flue gas that can be fine.

In a specific application, if the content of the heavy metal particles in the flue gas is high, the number of the absorption bottles can be increased properly, for example, a third-stage absorption bottle or more absorption bottles connected with the second-stage absorption bottle are arranged behind the second-stage absorption bottle. Heavy metal particles in the flue gas pass through the absorption device 3, obtain the suspension solution that contains heavy metal particles and metal cations to when subsequently detecting this solution, with the solution transmits to the heavy metal analyzer in, can accomplish the detection to the heavy metal type in the flue gas, concentration. And after passing through the absorption device 3, the heavy metal particles in the flue gas are absorbed, and the residual waste gas is discharged.

Sampling device 2 with between the absorbing device 3, generally adopt the heat tracing pipe to realize connecting, avoid the flue gas in the transmission extremely absorbing device 3's in-process, because the temperature is lower, flue gas liquefaction adsorbs on the pipeline wall after combining with the particulate matter that contains the heavy metal, influences follow-up measuring precision.

In addition, can also be provided with the filter core in the absorption bottle, the absorption bottle pass through the admission pipe with sampling device 2 realizes being connected sampling device 2 gathers behind the flue gas, through the admission pipe gets into during the absorption bottle, under the effect of filter core, the flue gas can be changed into the microbubble, has increased the area of contact with the absorption liquid to the heavy metal granule in the flue gas that makes to get into the absorption bottle can be by absorption of bigger degree. In order to protect the filter element from the corrosion of the absorption liquid, the filter element is generally made of ceramic.

Above-mentioned disclosed flue gas heavy metal particulate matter absorption system, including treater, sampling device and absorbing device, receiving behind the beginning sampling instruction of treater transmission, sampling device can gather the flue gas that the flue gas emission pipeline discharged, and with the flue gas transmission extremely absorbing device, absorbing device is including the absorption bottle that contains the absorption liquid, receiving behind the flue gas, the heavy metal particulate matter in absorption liquid and the flue gas carries out physical adsorption and chemical digestion to absorption that can be abundant the heavy metal particulate matter has improved the collection effect of heavy metal particulate matter, corresponding improvement follow-up detection precision that detects to heavy metal particulate matter concentration in the flue gas.

In addition, in the flue gas heavy metal particulate matter absorption system disclosed by the invention, the processor 1 further comprises a second sub-processor, and the second sub-processor is used for generating a back flushing instruction every other preset time period after generating a sampling starting instruction. The preset time period may be set by a worker through the processor 1, or the worker may perform an input operation of back purging on the processor 1 every other preset time period, so that the processor 1 generates a corresponding back purging instruction according to the input operation.

Referring to the schematic structural diagram shown in fig. 3, the flue gas heavy metal particulate absorption system further includes: and the reverse purging device 4 is connected with the processor 1, is arranged between the sampling device 2 and the absorption device 3, and is respectively connected with the sampling device 2 and the absorption device 3, and the reverse purging device 4 is used for blowing compressed air into the absorption device 3 from the position of the sampling device 2 after receiving a reverse purging command transmitted by the processor 1. The anti-purging device 4 utilizes clean air to connect the heavy metal particles in the connecting part of the sampling device 2 and the absorption device 3, and the heavy metal particles are back-purged to the absorption device 3 and absorbed by the absorption bottle, so that the influence on the collection effect caused by the residual heavy metal particles in the connecting part is avoided.

Wherein the back purge device 4 generally comprises: the first port of the first three-way valve is connected with the second port of the third three-way valve and is connected with a device for providing compressed air so as to lead the compressed air to enter; the second port of the first three-way valve is connected with the first port of the second three-way valve, and is connected with the sampling device 2, and is used for receiving the flue gas collected by the sampling device 2; the second port of the second three-way valve is connected with the first port of the third three-way valve and is simultaneously connected with the heat tracing pipe; the heat tracing pipe is connected with a first port of a fourth three-way valve, and a second port of the fourth three-way valve is connected with the absorption device 3. After receiving the back-flushing command transmitted by the processor 1, the back-flushing device 4 disclosed by the invention blows compressed air into the processor so as to enable residual heavy metal particles to enter the absorption device 3.

In the scheme disclosed by the invention, the connection between the reverse purging device 4 and the absorption device 3 can be realized by adopting a heat tracing pipe, and the heat tracing pipe usually keeps the temperature of about 120 ℃, so that the flue gas can keep a proper temperature and is transmitted to the absorption device 3, and the phenomenon that the absorption effect of the absorption device 3 is influenced because the flue gas is converted into liquid in the transmission process due to too low temperature is avoided.

According to the flue gas heavy metal particulate matter absorption system disclosed by the invention, after heavy metal particulate matters are collected, the concentration of the heavy metal particulate matters is detected, and the total amount of flue gas passing through the flue gas heavy metal particulate matter absorption system is required to be obtained, so that equal-flow-rate sampling is required to be realized when the heavy metal particulate matters are collected. Accordingly, the flue gas heavy metal particulate matter absorption system disclosed by the invention further comprises: a sampling temperature and pressure flow detection device 5, an absorbed temperature and pressure flow detection device 6, a singlechip (not shown in the figure) and an air pump 7, wherein,

and the sampling temperature and pressure flow detection device 5 is inserted in the flue gas discharge pipeline in parallel with the sampling device 2 and is used for detecting a differential pressure value and a temperature value. Wherein, the temperature and pressure flow detection device 5 at the sampling position comprises a thermometer, a pressure gauge and a differential pressure gauge. In the sampling temperature and pressure detecting device 5, after long-term use, the air duct of the differential pressure gauge may be blocked by smoke, so as to affect the measurement result, therefore, the differential pressure gauge is usually required to be subjected to back blowing.

And the post-absorption temperature and pressure flow detection device 6 is connected with the absorption device 3 and is used for detecting the temperature value, the pressure value and the flow velocity value of the waste gas flowing through the absorption device 3.

The single chip microcomputer is connected with the sampling device temperature and pressure flow detection device 5 and the post-absorption temperature and pressure flow detection device 6, and is configured to acquire a constant-speed tracking flow at the sampling device according to the differential pressure value and the temperature value acquired from the sampling device temperature and pressure flow detection device 5, acquire a sampling speed of the exhaust gas flowing through the absorption device 3 according to the temperature value, the pressure value, and the flow speed value acquired from the post-absorption temperature and pressure flow detection device 6, and generate a corresponding air pump control instruction according to a comparison result of the constant-speed tracking flow and the sampling flow corresponding to the sampling speed. Specifically, the single chip calculates the flow velocity of the flue gas on the sampling device 2 side according to the temperature value and the differential pressure value read from the sampling device temperature and pressure flow detection device 5, and then the single chip converts the flow velocity of the flue gas according to the cross section area of the sampling nozzle of the sampling device 2 and the flow velocity of the flue gas to obtain constant-velocity tracking flow; the single chip microcomputer obtains a sampling speed of the exhaust gas flowing through the absorption device 3 from the temperature value, the pressure value and the flow speed value obtained from the absorbed temperature and pressure flow detection device 6, compares the constant-speed tracking flow with the sampling flow corresponding to the sampling speed, and generates an air pump control instruction to control the air pumping flow of the air pump 7 when the constant-speed tracking flow is not equal to the sampling flow corresponding to the sampling speed.

The air pump 7 is connected with the single chip microcomputer and the post-absorption temperature and pressure flow detection device 6 and used for discharging waste gas passing through the post-absorption temperature and pressure flow detection device 6, and adjusting air pumping flow correspondingly according to the air pump control instruction after receiving the air pump control instruction transmitted by the single chip microcomputer so that the constant-speed tracking flow is equal to the sampling flow corresponding to the sampling speed, and therefore equal-flow-rate sampling is achieved.

In the flue gas heavy metal particulate matter absorption system, can also include humidity detection device, humidity detection device includes: humidity sensing probe and flue gas moisture meter, humidity detection device set up with the position that the warm pressure of sampling department flows detection device looks parallel, wherein humidity sensing probe inserts to in the flue gas emission pipeline for detect humidity in the flue gas emission pipeline to transmit the humidity value that detects to the flue gas moisture meter in.

In addition, in order to improve and detect the precision, flue gas heavy metal particulate matter absorption system still includes: first filter and heating box, first filter with sampling device 2 is connected, works as be provided with the blowback among the flue gas heavy metal particulate matter absorption system and sweep device 4 when, first filter can set up sampling device 2 with the blowback is swept between the device 4, is used for filtering the flue gas of 1 transmission of sampling device, generally speaking, first filter adopts 50um filter core, can not influence the sampling collection of heavy metal yet when preventing to block up the pipeline. Of course, filter elements of other specifications can be adopted, and the invention is not limited.

The first filter is mounted in a heating cartridge in which the first filter is placed to maintain the first filter at a constant temperature.

In addition, flue gas heavy metal particulate matter absorption system still includes: a drying pipe 8 and a second filter 9, wherein the drying pipe 8 is connected with the absorption device 3 and is used for drying the waste gas flowing through the absorption device 3; the second filter 9 is connected to the drying pipe 8 and the post-absorption warm-pressure flow detection device 6, and is configured to filter the exhaust gas flowing through the drying pipe, and transmit the filtered exhaust gas to the post-absorption warm-pressure flow detection device 6.

The drying tube 8 with the second filter 9 is right respectively the waste gas behind the absorbing device 3 is dried and is filtered, is favorable to warm pressure flows detection device 6 detects waste gas, improves warm pressure flows detection device 6's life.

In addition, in the scheme disclosed by the invention, the flue gas heavy metal particulate matter absorption system further comprises: and the liquid level detector is arranged on the bottle side of the last-stage absorption bottle and used for detecting the liquid level of the absorption liquid in the last-stage absorption bottle and transmitting the liquid level value to the processor 1. The liquid level detector is generally an infrared liquid level detector, and of course, other liquid level detectors may be used, which is not limited in the present invention.

After receiving the level value transmitted by the level detector, the processor 1 compares the level value with a preset value, and when the level value reaches the preset value, the processor 1 generates a sampling ending instruction and transmits the sampling ending instruction to the sampling device 2, so that the sampling device 2 ends sampling.

Through setting up the liquid level detector, can make treater 1 according to the liquid level value, in time produces and ends the instruction of sampling to prevent that the liquid level of last one-level absorption bottle is too high, and the absorption liquid overflows. In addition, the processor 1 may also convert the received end input operation of the worker into a corresponding end sampling instruction.

Further, referring to the schematic structural diagram shown in fig. 4, in the flue gas heavy metal particulate absorption system disclosed by the present invention, the processor further includes a third sub-processor, and the flue gas heavy metal particulate absorption system further includes: an absorption liquid addition pump 10 and an absorption liquid discharge valve 11. Wherein,

the third sub-processor is used for generating an absorption liquid adding instruction and an absorption liquid discharging instruction every preset time period. Through the third sub-processor, a plurality of time periods can be preset by a worker, so that the third sub-processor generates a control command, for example, after the first sub-processor generates an absorption liquid adding command, an absorption liquid discharging command is generated after a preset first time period, and after the absorption liquid discharging command is generated, an absorption liquid adding command is generated by the third sub-processor after a preset second time period, so that circulation of the absorption liquid is realized.

The absorption liquid adding pump 10 is connected to the processor 1, and is configured to, upon receiving the absorption liquid adding instruction transmitted by the third sub-processor, extract the absorption liquid stored in advance and add the absorption liquid to the absorption bottle in the absorption apparatus 3. The absorbing liquid add pump 10 with between the absorption bottle, can also include the sampling valve, for example, at one-level absorption bottle with set up one-level sampling valve between the pipeline that the absorbing liquid adds pump 10 and connects, at second grade absorption bottle with set up second grade sampling valve between the pipeline that the absorbing liquid adds pump 1 and connects, receiving absorbing liquid adds the instruction after, the sampling valve is opened, is convenient for absorbing liquid add pump 10 to transmit the absorbing liquid in the absorption bottle.

The absorption liquid discharge valve 11 is connected to the processor 1, connected to the bottom of the absorption bottle, and configured to assume a closed state after receiving the absorption liquid addition instruction transmitted by the third sub-processor, so that the absorption bottle receives the absorption liquid added by the absorption liquid addition pump 10, and assume an open state after receiving the absorption liquid discharge instruction, so as to discharge the absorption liquid in the absorption bottle. The absorption liquid discharge valve 11 may correspond to the absorption bottle, that is, when the absorption device 3 includes two absorption bottles, one absorption liquid discharge valve is provided at each of the bottoms of the primary absorption bottle and the secondary absorption bottle, or the bottoms of the plurality of absorption bottles are connected by a connecting member at which one absorption liquid discharge valve is provided.

Above-mentioned disclosed flue gas heavy metal particulate matter absorption system still is provided with absorption liquid and adds pump and absorption liquid discharge valve, and the treater can produce absorption liquid respectively and add instruction and absorption liquid discharge instruction every predetermined time quantum, absorption liquid adds the pump and is receiving absorption liquid adds the instruction back, extracts the absorption liquid, and transmit extremely in the absorption bottle, so that the absorption bottle absorbs the heavy metal granule in the flue gas. And after receiving the absorption liquid discharge instruction, the absorption liquid discharge valve is opened to discharge the absorption liquid in the absorption device, so that the absorption liquid in the absorption device is replaced. Through the flue gas heavy metal particulate matter absorption system disclosed by the scheme, only a worker needs to operate the processor, so that the absorption liquid in the absorption device can be added and discharged, the automation degree of the absorption liquid replacement is improved, and the absorption process of the heavy metal particulate matter is simpler and more convenient.

Further, the flue gas heavy metal particulate matter absorption system that this scheme disclosed still includes: a constant volume bottle sample injection valve 12 and a constant volume device, wherein

The constant volume bottle sample injection valve 12 is connected with the absorption liquid discharge valve 11, and is in an open state after receiving the absorption liquid discharge instruction, so that the absorption liquid in the absorption device 3 flows into the constant volume device after flowing through the absorption liquid discharge valve 11;

the constant volume device is connected with the constant volume bottle sample injection valve 10 and used for receiving the absorption liquid discharged by the absorption bottle, detecting the liquid level of the absorption liquid and carrying out corresponding constant volume operation on the received absorption liquid according to the detected liquid level value.

Through setting up the appearance bottle sampling valve 12 of deciding to hold with the constant volume device can receive absorbing device 3 is in the absorption liquid of discharging behind the through-flow flue gas to carry out the constant volume to it, so that follow-up heavy metal particulate matter's kind and concentration detect.

In this case, the processor further includes a fourth sub-processor configured to generate a start titration instruction when the liquid level is known to be lower than a preset value according to the detection result of the constant volume device, and generate an end titration instruction when the liquid level reaches the preset value.

When the absorption liquid is added into the absorption bottle by the absorption liquid adding pump 10, the capacity of the absorption liquid added by the absorption liquid adding pump each time can be determined according to the setting of the fourth sub-processor, generally, the capacity of the absorption capacity is slightly smaller than a preset value for facilitating subsequent titration and detection of the concentration of the heavy metal particulate matters, and the preset value is the capacity of the absorption liquid in the constant volume device after constant volume operation.

The constant volume device comprises: a volumetric flask 131, a liquid level detector (not shown), and a titration pump 132, wherein

The constant volume bottle 131 is connected with the constant volume bottle sample injection valve 12 and is used for receiving the absorption liquid discharged by the absorption bottle;

the liquid level detector is arranged on the bottle wall of the holding bottle 131, generates a liquid level signal when the absorption liquid in the holding bottle 131 reaches a preset liquid level, and transmits the liquid level signal to the fourth sub-processor, so that the fourth sub-processor can know that the liquid level reaches the preset value according to the liquid level signal;

the titration pump 132 is disposed above the fixed-volume bottle 131, and is configured to titrate purified water into the fixed-volume bottle after receiving the titration start instruction, and end the titration operation after receiving the titration end instruction.

Specifically, when the absorption liquid in the absorption bottle is transferred to the holding bottle 131, the liquid level of the absorption liquid in the holding bottle 131 does not reach a preset value, in this case, the liquid level detector does not generate a liquid level signal, the fourth sub-processor generates a titration start instruction, and the titration pump 132 starts to perform a titration operation. When the titration is performed to a certain stage, the absorption liquid in the constant volume bottle 131 reaches a preset liquid level, the liquid level detector generates a liquid level signal after detecting the absorption liquid, and the fourth sub-processor generates a titration ending instruction after receiving the liquid level signal and transmits the instruction to the titration pump 132. After receiving the titration ending instruction, the titration pump 132 ends titration, thereby completing the constant volume operation.

Through the constant volume device can acquire the absorption liquid of certain capacity after, absorbing the heavy metal particulate matter, is convenient for follow-up kind and the concentration to heavy metal particulate matter in the flue gas detect.

In order to detect the absorption liquid in the constant volume bottle 131 to obtain the type and concentration value of the heavy metal particulate matters in the flue gas, after the constant volume device completes the constant volume operation, the absorption liquid in the constant volume bottle needs to be sent to a heavy metal analyzer for detection. This step can be performed manually by a worker, and the absorption liquid in the constant volume bottle 131 is sent to the heavy metal analyzer. Alternatively, the processor may generate the absorption liquid extraction instruction after a predetermined period of time elapses after the generation of the end titration instruction. Under the circumstance, the flue gas heavy metal particulate absorption system disclosed by the scheme further needs to be provided with an absorption liquid extraction pump, wherein the absorption liquid extraction pump is connected with the bottom of the fixed-volume bottle 131 and used for extracting the absorption liquid in the fixed-volume bottle 131 and transmitting the absorption liquid to the heavy metal analyzer after receiving the absorption liquid extraction instruction, so that the heavy metal analyzer can detect the absorption liquid and obtain the type and concentration value of the heavy metal particulate in the flue gas.

Further, in order to discharge the waste liquid in the fixed-volume bottle 131, the processor further includes: a fifth sub-processor for generating a waste liquid discharge command after a preset period of time has elapsed after the generation of the end titration command.

In this case, the flue gas heavy metal particulate matter absorption system still includes: and the fixed-volume bottle discharge valve 14 is connected with the bottom of the fixed-volume bottle 131, and is used for being in an open state after receiving the waste liquid discharge instruction transmitted by the fifth sub-processor, so as to discharge the absorption liquid in the fixed-volume bottle 131, so as to perform the next absorption operation on the heavy metal particles.

In addition, in order to be able to clean the absorption bottle, the processor further includes: a sixth sub-processor that generates an absorber bottle cleaning instruction after a preset period of time has elapsed after generating the waste liquid discharge instruction.

Correspondingly, flue gas heavy metal particulate matter absorption system still includes: and the cleaning liquid adding pump is connected with the absorption bottle and is used for extracting the pre-stored cleaning liquid and adding the cleaning liquid into the absorption bottle after receiving the absorption bottle cleaning instruction transmitted by the sixth sub-processor. Generally, the cleaning liquid is purified water, the purified water is pumped into the absorption bottle, impurities remained on the absorption bottle can be absorbed, and the absorption bottle is cleaned.

In addition, among the flue gas heavy metal particulate matter absorption system that this scheme disclosed, still include: first stirring air pump, first stirring air pump sets up between absorption liquid discharge valve 11 and constant volume bottle injection valve 12, be used for receiving after the absorption bottle washs the instruction, extract pure air, and will extract pure air transmits extremely in the absorption bottle, so that washing liquid in the absorption bottle rolls to make the pipe wall attachment drop more easily, dissolve, and accelerate the mixing velocity of particulate matter and washing liquid, and guarantee that some particulate matters that are not dissolved in water do not deposit in the absorption bottle, guarantee abluent effect.

Simultaneously, in order to make to improve the cleaning performance, this scheme discloses flue gas heavy metal particulate matter absorption system still includes: second stirring air pump, second stirring air pump with surely hold bottle 131 bottom and be connected for receiving behind the absorption bottle cleaning instruction, extract pure air, and will pure air transmits extremely surely hold in the bottle 131, make the washing liquid roll, be favorable to absorbing the impurity of attaching on constant volume bottle 131 bottle wall. In this case, the absorption liquid discharge valve 11 and the constant volume bottle injection valve 12 are required to be in an open state after receiving the absorption bottle cleaning instruction transmitted by the processor, so that the cleaning liquid enters the constant volume bottle 131 after flowing through the absorption bottle, and the constant volume bottle 131 is cleaned.

The first stirring air pump and the second stirring air pump can start to execute operation after receiving the stirring instruction transmitted by the processor, and can also be manually controlled by workers according to actual needs.

In addition, a back-blowing valve can be arranged between the first stirring air pump and the second stirring air pump, the back-blowing valve is opened when the first stirring air pump and the second stirring air pump transmit pure air, and the back-blowing valve is closed under other conditions.

First stirring air pump and second stirring air pump can be for carrying out two independent stirring air pumps of different functions, in addition, also can be as shown in fig. 5, for a single stirring air pump 15, the stirring air pump has two or more delivery outlets, wherein first delivery outlet with absorption liquid discharge valve 11 is connected with constant volume bottle injection valve 12, the second delivery outlet with the bottom of constant volume bottle 131 is connected.

In addition, in this scheme, heavy metal particulate matter absorption system can also include: and a third stirring air pump, which is arranged between the fixed bottle discharge valve 14 and the heavy metal analyzer and used for extracting pure air, and transmitting the pure air to the fixed bottle 131 so as to ensure that the absorption liquid in the fixed bottle 131 is uniformly stirred and is convenient for subsequent detection. The pure air can also be compressed air. The third stirring air pump can start to execute operation after receiving the stirring instruction transmitted by the processor, and can also be used for manually controlling the air pump according to actual needs by workers. When the processor controls the third stirring air pump to work, a worker can preset a time period through the processor, so that after the processor generates an absorption liquid adding instruction, a third air pump stirring instruction is generated at preset time intervals.

In practical applications, the first sub-processor, the second sub-processor, the third sub-processor, the fourth sub-processor, the fifth sub-processor, and the sixth sub-processor may be different modules in a processor, or may be an independent processor capable of executing multiple functions.

In addition, the absorption liquid adding pump 10 and the cleaning liquid adding pump may be two different air pumps connected to the absorption bottle, or may be the same adding pump capable of performing multiple operations, the adding pump includes two pipelines respectively connected to a pre-stored absorption liquid container and a pre-stored cleaning liquid container, and after receiving an absorption liquid adding instruction, the adding pump extracts the absorption liquid and transfers the absorption liquid to the absorption bottle; and after receiving a cleaning liquid adding instruction, the adding pump extracts the cleaning liquid and transmits the cleaning liquid to the absorption bottle.

In addition, referring to the schematic structural diagram shown in fig. 6, in order to enable the absorption device 3 to be kept at a constant temperature, the flue gas heavy metal particulate absorption system further comprises: a cooling tank 16, a temperature sensor 17, a temperature controller 18 and a temperature regulator 19, wherein

The cooling tank 16 is used for placing the absorption device 3;

the temperature sensor 17 is arranged on the inner wall of the cooling tank 16 and used for sensing the temperature in the cooling tank 16 and generating a corresponding temperature value according to the temperature;

the temperature controller 18 is connected with the temperature sensor 17, and is configured to receive the temperature value transmitted by the temperature sensor 17, and generate a corresponding temperature adjustment instruction when the temperature value does not meet a preset value;

the temperature regulator 19 is connected to the temperature controller 18 and the cooling tank 16, and is configured to receive the temperature regulation instruction transmitted by the temperature controller 18 and then perform a corresponding temperature regulation operation.

In the flue gas heavy metal particulate matter absorption system disclosed by the invention, an absorption device for absorbing heavy metal particulate matters is placed in a cooling tank, a temperature sensor is arranged on the inner wall of the cooling tank, and the temperature sensor transmits the sensed temperature value to a temperature regulator. With the progress of the absorption process, the temperature of the absorption device gradually increases due to the absorption of the flue gas with higher temperature, when the temperature value of the cooling tank received by the temperature regulator does not meet a preset value, the temperature regulation operation is executed, and when the temperature value is regulated to meet the preset value, the temperature regulation operation is ended, so that the temperature of the absorption device is kept at a constant temperature. In the process, manual operation is not needed, the temperature control mode is simple, the temperature control effect is stable, and the absorption effect of heavy metal particles in the flue gas is improved.

In addition, the temperature controller is a PID (proportional integral derivative) temperature controller, which includes a mechanical controller and a semiconductor controller, and when the temperature controller is a mechanical controller, the mechanical controller includes: a cooling tube and a compressor.

The cooling pipe is connected with the cooling tank 15 and is used for transmitting a refrigerant absorbing heat of the cooling tank 15, and the refrigerant is used for cooling the cooling tank 15;

the compressor is connected with the cooling pipe and the temperature controller 17, and is used for receiving the refrigerant transmitted by the cooling pipe and compressing the refrigerant after receiving the temperature adjusting instruction.

When the temperature regulator is a semiconductor type regulator, the semiconductor type regulator includes: an evaporator, a compressor, a condenser, and a throttle valve, wherein,

the evaporator is connected with the cooling tank 15, and the evaporator contains liquid refrigerant and is used for enabling the liquid refrigerant to absorb heat and vaporize into low-temperature and low-pressure steam after receiving the temperature adjusting instruction;

the compressor is used for receiving the steam transmitted by the evaporator after receiving the temperature adjusting instruction, compressing the steam and converting the steam into high-pressure high-temperature steam;

the condenser is used for receiving the steam transmitted by the compressor after receiving the temperature adjusting instruction, condensing the steam and converting the steam into high-pressure liquid;

the throttle valve is used for receiving the high-pressure liquid transmitted by the condenser after receiving the temperature adjusting instruction, throttling the high-pressure liquid into low-pressure low-temperature refrigerant, and transmitting the low-pressure low-temperature refrigerant to the evaporator.

In the semiconductor type regulator, the cooling tank 15 is connected with the evaporator, and the heat of the cooling tank 15 can be taken away by the cooling agent, so that the temperature control purpose is achieved.

Further, in order to facilitate the realization of remote control of the absorption process of the flue gas heavy metal particulate matter, the flue gas heavy metal particulate matter absorption system disclosed by the invention further comprises: the host computer, the host computer with treater 1 is connected for produce upper computer control instruction, and will produce upper computer control instruction transmit to treater 1, by treater 1 will upper computer control instruction transmits to corresponding device, so that receive upper computer control instruction's device execution with the operation that upper computer control instruction corresponds, upper computer control instruction includes at least: the sample instruction is started.

The setting of host computer is convenient for remote staff to realize the control to flue gas heavy metal particulate matter absorption process. For example, a remote worker may operate the remotely-arranged upper computer to enable the upper computer to generate a sampling starting instruction, transmit the sampling starting instruction to the processor 1, and transmit the sampling starting instruction to the sampling device 2 by the processor 1, so that the sampling device 2 performs a sampling starting operation.

Certainly, the upper computer control instruction may further include other instructions, such as a sampling ending instruction, a back flushing instruction, and the like, and when the sampling ending instruction is received, the upper computer transmits the sampling ending instruction to the processor 1, and the processor 1 transmits the sampling ending instruction to the sampling device 2, so that the sampling is ended; when the instruction is a back flushing instruction, the upper computer transmits the back flushing instruction to the processor 1, and the processor 1 transmits the back flushing instruction to the back flushing device 4 so as to execute back flushing operation.

Referring to the structural schematic diagram of the flue gas heavy metal particulate matter absorption system disclosed in fig. 7, the flue gas heavy metal particulate matter absorption system disclosed in the present invention can generate a sampling start instruction by a processor when the flue gas heavy metal particulate matter needs to be absorbed, a sampling device receiving the sampling start instruction executes sampling operation, and transmits the collected flue gas to an absorption device, and the absorption device includes an absorption bottle containing absorption liquid, and after the absorption bottle receives the flue gas, the absorption liquid can sufficiently absorb the heavy metal particulate matter therein. The absorption liquid absorbs the heavy metal particles, so that the problem of low collection efficiency in the conventional technology when the particles are absorbed is solved, and the subsequent detection precision is improved.

Moreover, the back-blowing device in the flue gas heavy metal particulate matter absorption system utilizes compressed air to realize back-blowing, blows the heavy metal particulate matter remaining between the sampling device and the absorption device to the absorption bottle, and fully absorbs the heavy metal particulate matter in the flue gas. The temperature and pressure flow detection device at the sampling position in the flue gas heavy metal particle absorption system, the temperature and pressure flow detection device after absorption and the single chip microcomputer are arranged, so that the system can achieve sampling with equal flow velocity when absorbing the flue gas heavy metal particles, and the type and the content of the heavy metal particles in the flue gas can be conveniently detected.

In addition, the flue gas heavy metal particulate matter absorption system disclosed by the invention can filter out large-particle impurities in the flue gas due to the proper addition of the filter, the drying pipe and the like, is convenient for subsequent detection of the concentration of various heavy metals in the flue gas, and prolongs the service life of each device.

In addition, in this scheme, constant volume bottle sampling valve and constant volume device have still been set up after absorbing the heavy metal particulate matter in the flue gas, carry out the constant volume to the absorption liquid automatically to obtain the absorption liquid of certain capacity, it is right to be convenient for follow-up heavy metal analyzer the absorption liquid detects, has improved the degree of automation that carries out the detection to heavy metal particulate matter in the flue gas, makes whole testing process more high-efficient.

Moreover, in the flue gas heavy metal particulate matter absorption system disclosed in this scheme, still include the washing liquid and add the pump to after the absorption liquid evacuation in the absorption bottle, extract the washing liquid, for example the pure water, and will the washing liquid transmit to in the absorption bottle, realized the self-cleaning to the absorption bottle, improved the detection precision to heavy metal particulate matter.

In addition, the invention also discloses a flue gas heavy metal particulate absorption method, which comprises the following steps:

step S1, generating a corresponding sampling starting instruction according to the received sampling starting operation;

step S2, collecting the smoke discharged by the smoke discharge pipeline after the sampling start instruction is generated;

and S3, transmitting the collected flue gas to an absorption device, and absorbing heavy metal particles in the flue gas by absorption liquid in the absorption device.

According to the method provided by steps S1 to S3, when the heavy metal particles in the flue gas need to be absorbed, a sampling start instruction is generated to start the sampling operation, and the collected flue gas is transmitted to the absorption bottle containing the absorption liquid, so that the absorption liquid therein can sufficiently absorb the heavy metal particles therein. The absorption liquid absorbs the heavy metal particles, so that the problem of low collection efficiency in the conventional technology when the particles are absorbed is solved, and the subsequent detection precision is improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a flue gas heavy metal particulate matter absorption system which characterized in that includes:

2. The system of claim 1,

flue gas heavy metal particulate matter absorption system still includes:

3. The system of claim 1, wherein the flue gas heavy metal particulate absorption system further comprises:

4. The system of claim 1,

the processor further comprises:

flue gas heavy metal particulate matter absorption system still includes:

5. The system of claim 4, wherein the flue gas heavy metal particulate absorption system further comprises:

6. The system of claim 5, wherein the processor further comprises:

the constant volume device comprises:

7. The system of claim 6,

the processor further comprises:

flue gas heavy metal particulate matter absorption system still includes:

8. The system of claim 7,

the processor further comprises:

flue gas heavy metal particulate matter absorption system still includes:

9. The system of claim 1, wherein the flue gas heavy metal particulate absorption system further comprises:

a cooling tank for placing the absorption device;

10. The system of claim 1, wherein the flue gas heavy metal particulate absorption system further comprises:

11. A method for absorbing heavy metal particles in flue gas is characterized by comprising the following steps: