CN210533944U - Portable β ray smoke concentration meter - Google Patents
Portable β ray smoke concentration meter Download PDFInfo
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- CN210533944U CN210533944U CN201921044312.7U CN201921044312U CN210533944U CN 210533944 U CN210533944 U CN 210533944U CN 201921044312 U CN201921044312 U CN 201921044312U CN 210533944 U CN210533944 U CN 210533944U
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Abstract
The utility model discloses a portable β ray smoke and dust concentration appearance comprises sampling rifle and control box two parts, the sampling rifle constitute sampling system by sampling mouth, sampling pipe, filter membrane clamp, pitot tube, smoke temperature sensor, the cover is equipped with the outer tube apron in one end of outer tube, the pipe inside of outer tube apron is fixed with sampling briquetting, sampling briquetting down, be provided with the removal membrane frame between sampling briquetting and the sampling briquetting down, this novel adoption removes the sampling filter membrane to the pipe front end, and furthest has reduced the absorption laying dust phenomenon of sampling pipeline, has effectively solved the pipeline laying dust problem of extraction smoke and dust detector, has guaranteed the reliability and the authenticity of smoke and dust concentration appearance data.
Description
Technical Field
The utility model relates to a power plant, steel plant, glass factory and cement plant etc. are by duct flue, to the detection technology field of emission particulate matter in the atmosphere, concretely relates to portable β ray smoke and dust concentration meter.
Background
Environmental monitoring departments or enterprises need to detect the emission concentration of flue particles irregularly and sometimes compare the emission concentration with on-line smoke dust instruments installed on the site. The conventional smoke concentration detection is a manual sampling method, firstly, a filter membrane for sampling is baked for 1 hour in a drying oven with the temperature of 105-fold in a laboratory for 110 ℃, taken out and put into a dryer for cooling to the room temperature, a balance with the sensing quantity of 0.1mg is used for weighing, then a smoke gun is used for extracting a sample in a smoke flue on the filter membrane on site, after sampling is finished, the filter membrane is baked for 1 hour in the drying oven with the temperature of 105-fold in the laboratory for 110 ℃, taken out and put into the dryer for cooling to the room temperature, the balance with the sensing quantity of 0.1mg is used for weighing, and the mass difference value of two times of sampling is used for calculating the concentration of.
The manual method is time-consuming and labor-consuming, the waiting time from sampling to data outputting is too long, the detected data cannot be given on site at that time, the data given later can be questioned, and the sample filter membrane is easy to be distorted by multiple middle transportation and operation links, so that the data is greatly influenced. Particularly, the national standard for the emission concentration of the flue is lower and lower, and the distorted filter membrane has larger influence on the low sampling concentration ratio.
Disclosure of Invention
In order to solve the existing problems, the utility model provides a portable β ray smoke concentration meter.
The utility model discloses a realize through following technical scheme:
a portable β ray smoke concentration instrument comprises a sampling gun and a control box, wherein the sampling gun comprises a sampling nozzle, a sampling pipe, a filter membrane clamp, a pitot tube and a smoke temperature sensor, a sampling system is formed by the sampling nozzle, the sampling pipe, the filter membrane clamp, the pitot tube and the smoke temperature sensor, an outer tube cover plate is sleeved on one end of an outer tube, a sampling upper pressing block and a sampling lower pressing block are fixed on the inner side of the smoke gun of the outer tube cover plate, a movable membrane frame is arranged between the sampling upper pressing block and the sampling lower pressing block, the filter membrane clamp is arranged in a step circle of the movable membrane frame, the filter membrane clamp is arranged on a copper bush and fixed through a screw rod nut, a screw rod bearing is arranged at the end of the screw rod, the movable membrane frame moves on a guide rail, a smoke temperature sensor is arranged on the outer side of the outer tube cover plate, a through hole is formed in the outer tube cover plate, the through hole and the pitot tube, a sampling nozzle is connected to the end of the sampling pipe, the sampling nozzle is connected to the outer tube, the other end of the sampling pipe, the sampling pipe is connected to the filter membrane clamp, the filter membrane clamp is connected to a sealing ring at the connection of the filter membrane clamp, a sampling pipe clamp is arranged at the bottom of the filter membrane clamp, a sampling pipe clamp, a sampling nozzle is connected to the bottom of the sampling pipe clamp, a sampling lower pressing block, a sampling box, a fan pump module is arranged on a fan pump, a fan pump module is connected to a fan pump, a fan pump motor pump, a fan pump, a.
As a further optimization scheme of the utility model, a sampling pressure head is arranged below the filter membrane clamp at the front end of the sampling gun; the sampling pressure head consists of a pressure spring and a pressure spring plate; a step is arranged below the sampling pressure head, and a cam is arranged in the step; the cams are connected by a cam drive shaft.
As a further optimization scheme of the utility model, the filter membrane mechanism of sampling rifle change sampling constitute by removing membrane frame, screw-nut, guide rail, lead screw motor, lead screw synchronizing wheel, hold-in range, motor synchronizing wheel.
As a further optimization scheme of the utility model, the sampling rifle constitute by sampling control panel, β source, lid check detector, dry module.
As a further optimization scheme of the utility model, the sampling rifle length be not limited to 1 meter to 3 meters, the control box by pump case control panel, fan, pump controller, orifice plate, pump case shell, operation screen, dehydrator, fan housing, aspiration pump constitute, the control box external connection by USB interface, RS232 interface, connection air cock, connection socket constitute, portable β ray smoke and dust concentration appearance by trachea and cable junction smoke rifle and control box two parts.
Compared with the prior art, the beneficial effects of the utility model are that: this novel adoption will sample the filter membrane and remove the opium pipe front end, furthest has reduced the absorption laying dust phenomenon of sampling pipeline, has effectively solved the pipeline laying dust problem of extraction formula smoke and dust detector, has guaranteed the reliability and the authenticity of smoke and dust concentration appearance data. The situation that the data report can not be directly output in field detection is solved, the technical requirements of personnel are reduced, the workload is reduced, and a manual method is completed through automation.
Drawings
FIG. 1 is a flow chart of the operation of a portable β ray smoke concentration meter;
FIG. 2 is a structural diagram of a portable β ray smoke concentration instrument;
fig. 3 is a diagram of a sampling filter-pressing membrane clamp of a sampling gun of a portable β ray smoke dust concentration instrument.
In the figure, the sampling device comprises 1 sampling nozzle, 2 sampling pipe, 3 pitot tube, 4 smoke temperature sensor, 5 lead screw bearing, 6 outer pipe cover plate, 7 sampling upper pressing block, 8 sealing ring, 9 filter membrane clamp, 10 mobile membrane frame, 11 copper sleeve, 12 lead screw nut, 13 outer pipe, 14 guide rail, 15 lead screw, 16 air nozzle, 17 outer pipe flange, 18 handle, 19 sampling control plate, 20 drying upper pressing block, 21 drying lower pressing block, 22 drying module, 23 measuring upper block, 24, β source, 25 cover grid detector, 26 measuring lower block, 27 film taking window, 28 film taking baffle, 29 lead screw motor, 30 lead screw synchronous wheel, 31 synchronous wheel bearing, 32, synchronous wheel 33, motor synchronous wheel, 34, motor fixing plate, 35 sampling box shell, 36 connecting air nozzle 37, connecting socket, 38 air pipe, 39, cable control plate, 40 pump box, 41 fan pump controller, 42, motor synchronous wheel, 34, motor fixing plate, 35 fan, sampling box shell, 36, connecting air nozzle, connecting socket, 38 air pipe, 39, cable control plate, 40 pump controller, 41, fan controller, pump controller, 43, pump driving shaft, pump driving wheel, pump 53, pressure plate, USB pressure plate, pressure head, pressure gauge, 50, pressure gauge, pressure.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
the portable β ray smoke concentration instrument is composed of a sampling gun and a control box, as shown in fig. 1-3, the sampling gun is composed of a sampling nozzle (1), a sampling tube (2), a filter membrane clamp (9), a pitot tube (3) and a smoke temperature sensor (4), a sampling system is composed of a sampling motor (22) and a control plate, the sampling gun is composed of a screw rod (35), a synchronous sampling motor (35) and a synchronous sampling motor (35), a synchronous sampling motor (35) is arranged at the top of the sampling box, a synchronous sampling motor (35) is arranged at the bottom of the sampling box, a synchronous sampling motor (35) is arranged at the top of the sampling box, a synchronous sampling motor control plate (35) is arranged at the top of the sampling box, a sampling nozzle (35), a synchronous sampling motor (35) is arranged at the bottom of the sampling nozzle (35), a screw rod clamp (35), a sampling motor (35) is arranged at the top of the sampling nozzle (35), a screw rod clamp (35), a sampling motor (35) is arranged at the top of the sampling box, a screw rod clamp (35), a screw rod (4), a screw rod (35) is arranged at the top of the sampling motor, a screw rod clamp (35), a screw rod clamp (35) is arranged at the top of the sampling motor, a screw rod (35), a screw rod clamp (35), a screw rod (35) is arranged at the sampling motor, a screw rod (35), a screw rod clamp (35) is arranged at the sampling motor, a screw rod clamp (35), a screw rod (35) and a screw rod (35), a screw rod (35) is arranged at the sampling motor, a screw rod clamp (35), a screw rod (35) is arranged at the top of a screw rod (35), a screw rod is arranged at the sampling motor, a screw rod (35), a screw rod is arranged at the top of a screw rod (35), a screw rod is arranged at the sampling motor, a screw rod is connected with a screw rod is arranged at the screw rod is connected with a screw rod (35), a screw rod is connected with a screw rod (35), a screw rod is connected with a screw rod, a screw rod is connected with a screw rod (35), a screw rod is connected with a screw rod, a screw rod is connected with a screw rod, a screw rod (35), a screw rod is connected with a screw rod, a screw rod is connected with a screw rod, a screw rod is connected with a screw rod, a screw rod.
In the embodiment of the novel device, the operation flow of the portable β ray smoke concentration instrument comprises the steps of placing a filter membrane clamp into a membrane loading position of the smoke concentration instrument before sampling, automatically moving the smoke concentration instrument to a drying position for membrane heating and drying, automatically moving the smoke concentration instrument to the measuring position for measurement of a blank membrane after drying is finished, automatically moving the smoke concentration instrument to the foremost end of a smoke gun to start sampling after measurement is finished, automatically moving the smoke concentration instrument back to the drying position for heating and drying after sampling is finished, automatically moving the smoke concentration instrument to the measuring position for membrane measurement after sampling after drying is finished, automatically calculating the concentration value of smoke through the values measured twice, and finally automatically moving the sampling membrane back to the membrane loading position to take out, thereby completing the whole sampling period.
The operation process of the portable β ray smoke concentration instrument is not limited to the manual operation of moving the filter membrane to the sampling position at the front end of the smoke gun.
The principle of the patent is that the portable β ray smoke density meter is designed according to β ray absorption principle, β ray is a high-speed electron flow, when the ray passes through a substance, the ray and electrons in the substance generate inelastic collision, and the energy of the electron flow is partially absorbed, when the maximum energy of a β ray source is less than 1Mev, the mass of the penetrating substance is small, and the intensity of the β ray source is constant, the absorbed quantity is only related to the mass of the absorbing substance and is not related to the physical and chemical characteristics (such as components, particle sizes, dispersion degrees, shapes, colors and the like) of the absorbing substance, so the smoke density meter can directly measure the mass density without any conversion.
In the sampling channel, the sampling flow of the pump is controlled to ensure that the flow speed at the sampling nozzle is constant with the flow speed in the flue, and the particulate matters in the flue are collected on the filter membrane.
This patent is when the instrument sampling, puts into the filter membrane by rear end dress membrane position earlier, moves to the measurement position and surveys the blank membrane initial value earlier, conveys the filter membrane to front end sampling position through the lead screw again, advances to cross the briquetting down and presses and closely seal the back and begin the sampling, moves back to dry position through the lead screw after the sampling is accomplished and dries, moves to the measurement position after the drying is accomplished and carries out the final value measurement of filter membrane, moves to dress membrane position at last and takes out, accomplishes whole sampling test cycle. Through removing the filter membrane to the smoke gun foremost, avoided the sampling filter membrane to place the rear end, the pipeline laying dust problem that needs to bring with nearly 2 meters sampling pipe connection has effectively solved extraction formula dust measuring detecting instrument pipeline laying dust drawback.
The whole system is characterized in that a constant β ray source sequentially passes through a blank filter membrane and a filter membrane collected with particle samples, the change of the absorption amount of the filter membrane is compared, and the mass (Delta m) of the particle samples can be obtained1And N2。
β the attenuation of the intensity of a ray passing through an absorbing material can be calculated by equation (1):
in the formula:
i-intensity of β source radiation after passing through a substance;
I0β intensity of radiation from the source;
ΔmT-total mass per unit area of absorbent material (mg/cm 2);
k is the mass absorption coefficient.
The geiger is used to count β ray flux, and the change in the count frequency can be used to characterize β ray intensity change, as calculated by equation (2):
when β rays pass through the mass per unit area of the film as Δ m0The counting frequency of the membrane is calculated by the formula (3):
starting the collection of the particles, and setting the weight of the particles collected on the filter membrane as Deltam, the total mass of the absorbing material as DeltamT＝Δm0+ Δ m, the counting frequency at this time is calculated by equation (4):
counting by using a Geiger, and the time of counting twice before and after sampling is equal, the total number of counting twice is calculated by the following formulas (5) and (6) respectively:
N1＝f1Ts..................................(5)
N2＝f2Ts..................................(6)
in the formula:
N1，N2-the accumulated count values for the case where the filter membrane is cleaned and the filter membrane with collected particulate matter are respectively identified by the cover;
f1，f2-the counting frequency of the counting tubes determined by equations (3) and (4);
TSthe count time of the counting tube is set to 120 seconds.
The mass of the particulate matter is calculated by equation (7):
in the formula:
s-sample spot area, cm2, other parameters are described above.
During sampling, the flow rate of a flue is measured according to a smoke gun pitot tube, the flow rate of a sampling pipeline and the flow rate of flue gas are controlled to be constant, smoke enters from a sampling nozzle, particulate matters are deposited when the smoke flows through a filter membrane, and a sample dust spot with the area of 1cm2 is formed on the filter membrane. The sample standard volume is calculated by equation (8):
in the formula:
Vnd-gas production standard condition volume, L;
q is the gas production flow of the sampling pump, L/min;
t-gas production time, min;
Tr-pre-gauge temperature, ° c;
Ba-ambient atmospheric pressure in situ, kPa.
The particulate matter concentration is calculated by equation (9):
in the formula:
c-particulate matter concentration, mg/m 3; other parameters are as described above.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A portable β ray smoke concentration instrument comprises a sampling gun and a control box, and is characterized in that the sampling gun comprises a sampling nozzle, a sampling tube, a filter membrane clamp, a pitot tube and a smoke temperature sensor, an outer tube cover plate is sleeved on one end of an outer tube, a sampling upper pressing block and a sampling lower pressing block are fixed on the inner side of the smoke gun of the outer tube cover plate, a movable membrane frame is arranged between the sampling upper pressing block and the sampling lower pressing block, the filter membrane clamp is arranged in a step circle of the movable membrane frame, the filter membrane clamp is arranged on a copper bush, the movable membrane frame is driven by a lead screw and fixed through a lead screw nut, a screw rod bearing is arranged at the end of the lead screw, the movable membrane frame moves on a guide rail, the smoke temperature sensor is arranged on the outer side of the outer tube cover plate, a through hole is formed in the outer tube cover plate, a sampling tube and a pitot tube are arranged in the through hole, the sampling tube and the pitot tube support tube are connected with the sampling nozzle on the exposed end of the sampling tube, the other end of the sampling tube, the sampling tube is connected with the sampling nozzle, the other end of the sampling tube, the sampling tube clamp is connected with a corresponding sampling tube, a control plate of a fan, a fan is arranged on the sampling box, a fan pump, a fan is arranged on the fan, a fan pump, a fan is arranged on a fan, a fan pump, a pump control plate is arranged on a fan, a fan is arranged on a pump, a fan, a pump.
2. The portable β ray smoke dust concentration instrument as claimed in claim 1, wherein a sampling pressure head is arranged below a filter membrane clamp at the front end of the sampling gun, the sampling pressure head is composed of a pressure spring and a pressure spring plate, a step is arranged below the sampling pressure head, a cam is arranged in the step, and the cam is connected with the cam through a cam transmission shaft.
3. The portable β ray smoke concentration meter as defined in claim 1, wherein the filter membrane mechanism for replacing the sampling gun comprises a movable membrane frame, a screw nut, a guide rail, a screw motor, a screw synchronizing wheel, a synchronous belt, and a motor synchronizing wheel.
4. The portable β ray smoke concentration meter as defined in claim 1, wherein the sampling gun comprises a sampling control board, a β source, a Geiger detector and a drying module.
5. The portable β ray smoke concentration meter according to claim 1, wherein the sampling gun is not limited to 1-3 m in length, the control box comprises a pump box control panel, a fan, a pump controller, an orifice plate, a pump box casing, an operation panel, a dehydrator, a fan housing, and an air suction pump, the external interface of the control box comprises a USB interface, an RS232 interface, a connection nozzle, and a connection socket, and the portable β ray smoke concentration meter comprises an air pipe and a cable connecting the smoke gun and the control box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044312.7U CN210533944U (en) | 2019-07-05 | 2019-07-05 | Portable β ray smoke concentration meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044312.7U CN210533944U (en) | 2019-07-05 | 2019-07-05 | Portable β ray smoke concentration meter |
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| CN210533944U true CN210533944U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372220A (en) * | 2022-10-26 | 2022-11-22 | 杭州泽天春来科技有限公司 | Particulate matter concentration detection device |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115372220A (en) * | 2022-10-26 | 2022-11-22 | 杭州泽天春来科技有限公司 | Particulate matter concentration detection device |
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Address after: 430000, Hubei Wuhan New Technology Development Zone, East Lake, 40 hi tech four, No. 02, Gezhouba Dam sun town 8, room 2 Patentee after: WUHAN CHENKE OPTICAL INSTRUMENTATION Co.,Ltd. Address before: 430000 room 02, 2 / F, building 8, taiyangcheng, Gezhouba, No. 40, Gaoxin 4th Road, Donghu New Technology Development Zone, Hongshan District, Wuhan City, Hubei Province Patentee before: WUHAN CHENKE OPTICAL INSTRUMENTATION Co.,Ltd. |