CN210108395U - Online hygrometer sampling device - Google Patents
Online hygrometer sampling device Download PDFInfo
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- CN210108395U CN210108395U CN201921011180.8U CN201921011180U CN210108395U CN 210108395 U CN210108395 U CN 210108395U CN 201921011180 U CN201921011180 U CN 201921011180U CN 210108395 U CN210108395 U CN 210108395U
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Abstract
The application discloses online hygrometer sampling device includes: the flow guide part of the sampling mechanism is arranged opposite to the direction of the airflow; the signal processing unit is connected with the sampling mechanism through a probe tube and completes signal conversion, display and output; and the blowback pipe penetrates through the probe pipe and is communicated with the sampling mechanism, wherein compressed air is introduced into the blowback pipe. Humidity transducer and ceramic filter core in this application all are in the heating environment, even the flue gas velocity of flow slows down, form a small amount of scale deposit, but under the effect of regularly blowback, a small amount of deposition and acidizing fluid in ceramic filter core and the draught tube are blown away, and this application can avoid deposition, scale deposit and corrosion sensor's the condition to appear, can realize again that stable, reliable, accurately measure.
Description
Technical Field
The application belongs to the technical field of on-line monitoring equipment, and particularly relates to an on-line hygrometer sampling device.
Background
At present, most of the flue inserted online hygrometers are only applicable to relatively good process environments, such as food, medical treatment, laboratories, atmospheric environment monitoring and the like. When the products are used in the severe flue gas emission process environments of high temperature and high corrosivity, such as electric power, steel, chemical engineering and the like, the common problems of corrosion, aging and short service life of the sensor can occur. Especially, when the flue inserted type online hygrometer is used for the working condition of 'fixed pollution source smoke emission continuous monitoring', the online hygrometer not only has high requirements on the accuracy of the instrument, but also provides great challenges for the timeliness and the reliability of the continuous operation of the online hygrometer.
As the national requirements on the control of pollutant emission are continuously tightened, although the pollutant emission is especially SO2、NOXThe emission limit of corrosive acid gases is very low, but the acid liquid can be formed by mixing the acid gases existing in small amount with water condensed and separated from the flue gas with high humidity, and the serious consequences of increasing the measurement error, shortening the service life of the sensor and the like can be caused by the long-time retention of the acid liquid in the sampling part of the sensor. Even if the flue gas temperature is higher than 90 ℃ (flue gas dew point), acid liquor is not easy to generate, but the sensor is damaged due to overhigh temperature.
The two problems are also common in the existing flue inserted online hygrometers on the market, and can be solved by the following ways: 1) the sensor with higher quality is selected for realization, but the production cost and the sales price are increased to influence the enterprise benefit; 2) through transforming unreasonable sampling device to solve above-mentioned two kinds of problems that exist with lower manufacturing cost, reach the purpose of making a lot of effort doubly.
As shown in FIG. 1, the device of a typical flue insertion type online hygrometer mainly comprises a protective cover 1, a signal acquisition, processing and display output unit 2, a probe 3, an anticorrosion casing 4, a sensor 5 and a metal filter element 6. The hygrometer is arranged on a chimney (flue) through which flue gas flows through a connecting flange, the flue gas flowing in the chimney (flue) firstly passes through a metal filter element 6, and the filter element filters impurities such as particles and plays a role in protecting sensitive elements of a sensor 5 from being polluted. The corrosion-resistant shell 4 is used for fixing the sensor, so that the sensor is convenient to disassemble, assemble and maintain; on the other hand, the acidic gas in the flue gas is prevented from corroding the internal lead and the sensor 5. The sensor 5 transmits the humidity raw signal to the signal acquisition processing display output unit 2, and finally the unit completes all signal conversion, display and output. The sampling device only comprises a filter element and an anticorrosive shell, and is simple. This sampling device only has filter core and anticorrosive shell to constitute, in the flue gas that humidity is big, particulate matter concentration is great, not only easy scale deposit, aqueous vapor forms acidizing fluid at the inside condensation of filter core simultaneously, and long-time operation is corroded easily.
As shown in fig. 2, another type of online hygrometer sampling device, except for the sampling device, has a substantially similar configuration and principle as the first embodiment. The sampling device mainly comprises a flow guide pipe 1 ', a sensor and a filter element fixed support 5'. The draft tube 1 'is composed of draft tube fixing screws 2' (4), draft holes 3 '(5) and draft holes 4'. Wherein the sensor and filter element fixed support 5 ' consists of a ceramic filter element 6 ', a thermistor 7 ', a heating module 8 ' and a sensor 9 '. When the draft tube 1 ' is installed, the draft opening 4 ' needs to be over against the flow direction of flue gas, enough flue gas flows into the sampling device, and the draft holes 3 ' are also used for absorbing the flue gas, so that the flue gas forms airflow in the draft tube, and large particles can be prevented from entering the draft tube. The front half part of the sensor and filter element fixed support 5 ' is used for installing the ceramic filter 6 ', and the rear half part is used for installing and fixing the thermistor 7 ', the heating module 8 ' and the sensor 9 '. The thermistor 7 ', heating module 8' and temperature control circuit part are used to heat the support so that its temperature is close to 100 ℃, heating the water that may condense to gaseous water, avoiding scaling and acid formation at the ceramic filter element. The sensor 9' collects the humidity signal of the gaseous state after passing through the ceramic filter. After the components are installed, the installation holes are sealed by high-temperature-resistant glue, so that the situation that parts such as a lead, a circuit board and the like are corroded due to backward flowing of smoke is avoided. Although the heating mode is adopted to avoid the generation of acid liquor, the smoke with high concentration of particulate matters can deposit ash and scale, so that the ceramic filter is blocked, and the result of inaccurate measurement is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings or drawbacks of the prior art, the present application provides a solution to the above-mentioned technical problem.
In order to solve the technical problem, the application is realized by the following technical scheme:
an online hygrometer sampling device comprising: the flow guide part of the sampling mechanism is arranged opposite to the direction of the airflow; the signal processing unit is connected with the sampling mechanism through a probe tube and completes signal conversion, display and output; and the blowback pipe penetrates through the probe pipe and is communicated with the sampling mechanism, wherein compressed air is introduced into the blowback pipe.
Further, in the sampling device of the online hygrometer, the sampling mechanism includes a flow guide pipe, a ceramic filter element, and a fixing support, wherein the ceramic filter element is installed inside the flow guide pipe and is communicated with the blowback pipe, one end of the fixing support is used for installing the ceramic filter element, and the other end of the fixing support is provided with a humidity sensor, a temperature sensor, a heating module, and a blowback pipe; the temperature sensor, the heating module and the temperature control unit are used for heating the fixed support to enable the temperature of the fixed support to be close to 70-80 ℃; the humidity sensor collects gaseous humidity signals filtered by the ceramic filter element and transmits the gaseous humidity signals to the signal processing unit through a circuit.
Further, in the above online hygrometer sampling device, the sampling mechanism further includes a partition board, the partition board is installed inside the draft tube and divides the draft tube into two parts, the draft tube has a shorter side and a longer side, the shorter side is an air inlet, and the longer side is an air outlet.
Further, foretell online hygrometer sampling device, wherein, the baffle is the structure of buckling, wherein, the front end of baffle is towards the air inlet first contained angle setting of buckling, the buckle point of baffle with the line at air inlet edge with the plane at the rear end place of baffle forms the second contained angle setting.
Further, in the online hygrometer sampling device, the first included angle is 120-140 °, and the second included angle is 25-45 °.
Further, in the above online hygrometer sampling device, the first included angle is 135 °, and the second included angle is 30 °.
Further, in the sampling device for the online hygrometer, an electromagnetic valve is further arranged on the blowback pipe, and the electromagnetic valve is electrically connected with the signal processing unit through a cable.
Further, in the online hygrometer sampling device, the blowback pipe is further provided with a pressure regulating filter.
Further, the online hygrometer sampling device further comprises a protective cover, wherein the protective cover is disposed outside the signal processing unit.
Further, in the sampling device of the online hygrometer, the pressure of the compressed air introduced into the blowback pipe is greater than 0.4MPa, and the flow rate is greater than 100L/min.
Compared with the prior art, the method has the following technical effects:
the humidity sensor and the ceramic filter element are both in a heating environment, even if the flow rate of smoke is reduced to form a small amount of scale, a small amount of dust and acid liquor in the ceramic filter element and the guide pipe are blown away under the action of timed back blowing, so that the conditions of dust deposition, scale formation and sensor corrosion can be avoided, and stable, reliable and accurate measurement can be realized;
this application collects flue gas water conservancy diversion, heating, blowback as an organic whole, is applicable to in comparatively abominable "fixed pollution source fume emission continuous monitoring" operating mode, realizes not having deposition, scale deposit, does not have acid liquor corrosion sensor and stable, reliable, accurately measuring effect.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the structure schematic diagram of the existing flue inserted online hygrometer;
FIG. 2: the structure schematic diagram of the existing on-line hygrometer sampling device;
FIG. 3: the structure of the sampling device of the on-line hygrometer is schematic;
FIG. 4: a cross-sectional view of the sampling mechanism of the present application;
FIG. 5: a cross-sectional view of a fixed bracket in the present application.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
As shown in fig. 3, the sampling device of the online hygrometer of the present embodiment includes: a sampling mechanism 10, the flow guide part of which is arranged opposite to the direction of the airflow; the signal processing unit 30 is connected with the sampling mechanism 10 through a probe 20, and the signal processing unit 30 completes signal conversion, display and output; and a blowback pipe 40 passing through the probe 20 and communicating with the sampling mechanism 10, wherein the blowback pipe 40 is filled with compressed air.
The flow guiding part of the sampling mechanism 10 should be aligned with the air flow direction in front, and compressed air with pressure greater than 0.4MPa and flow greater than 100L/min needs to be introduced into the blowback pipe 40.
The sampling mechanism 10 comprises a guide pipe 11, a ceramic filter element 12 and a fixed support 50, wherein the ceramic filter element 12 is installed inside the guide pipe 11 and communicated with the blowback pipe 40, one end of the fixed support 50 is used for installing the ceramic filter element 12, and the other end of the fixed support 50 is provided with a humidity sensor 51, a temperature sensor 52, a heating module 53 and the blowback pipe 40; the temperature sensor 52, the heating module 53 and the temperature control unit are used for heating the fixed support 50 and the environment nearby the fixed support 50 to enable the temperature of the fixed support to be close to 70-80 ℃; the humidity sensor 51 collects a gaseous humidity signal filtered by the ceramic filter element 12 and transmits the gaseous humidity signal to the signal processing unit 30 through a line.
The heating module 53 is used for heating the humidity sensor 51 to 70-80 ℃, and the reason is that: 1) the maximum limit working temperature of most chips or sensors is 70-85 ℃; 2) when regular back-blowing air flows through the area, the heating module 53 can also heat the back-blowing air, so that the ceramic filter element 12 is not blocked or scaled; 3) Although the heating temperature can not reach 100 ℃, a large amount of condensed water can be avoided, and a large amount of acid liquor can not be generated to corrode the sensor.
The blowback pipe 40 is further provided with an electromagnetic valve 41, and the electromagnetic valve 41 is electrically connected with the signal processing unit 30 through a cable. The signal processing unit 30 can be set with an automatic back-flushing interval time, wherein the general interval time is 1-3 days. If the user needs to test the back-blowing function, the user can also manually control the solenoid valve 41, at which time the compressed air filters the impurities (water and oil) in the gas through the pressure-regulating filter 42 described below, and then back-blows along the back-blowing pipe 40 all the way to the ceramic filter element 12 in the sampling mechanism 10, and at the same time, the deposited dust and scale in the draft tube 11 are also blown back to the flue or chimney together.
Further, in this embodiment, the blowback pipe 40 is further provided with a pressure-regulating filter 42, and the pressure-regulating filter 42 can filter impurities (water and oil) in the gas.
This embodiment still includes protection casing 60, protection casing 60 sets up the outside of signal processing unit 30, protection casing 60 can prevent effectively that signal processing unit 30 from receiving flue gas, dust etc.
In addition to the above-mentioned back blowing and heating part, the present embodiment further includes a partition plate 13, the partition plate 13 is installed inside the flow guiding tube 11 and divides the flow guiding tube 11 into two parts, the flow guiding tube 11 has a shorter side and a longer side, wherein the shorter side is an air inlet, and the longer side is an air outlet, the partition plate 13 is of a bent structure, wherein the front end of the partition plate 13 is bent towards the air inlet by a first included angle α, and a line connecting the bent point of the partition plate 13 and the edge of the air inlet and a plane where the rear end of the partition plate 13 is located form a second included angle β, and further, the partition plate 13 is welded to the wall of the flow guiding tube 11.
The first included angle α is 120-140 degrees, the first included angle α is preferably 135 degrees, the second included angle β is 25-45 degrees, and the second included angle β is preferably 30 degrees.
Because the moisture in the flue gas is in a diffused and flowing state, the humidity sensor 51 does not need to contact a large amount of flue gas, and only the diffused moisture content can reach the sensor to measure the humidity signal. When the flue gas reaches the vicinity of the ceramic filter element 12, since the inner diameter is reduced by half by the partition plate 13, the flow velocity is reduced by 4 times in the vicinity of the ceramic filter element 12 than in the front end partition plate 13 under the flue gas of equal flow, so that the flue gas is sufficiently contacted with the humidity sensor 51. The positions of the sensor and the heating part are blocked by corrosion-resistant and high-temperature-resistant glue, and the tail end of the back flushing pipe 40 is closed by a normally closed electromagnetic valve. Therefore, all the smoke can only return to the flue (chimney) through the exhaust port during measurement.
Humidity transducer and ceramic filter core in this application all are in the heating environment, even the flue gas velocity of flow slows down, form a small amount of scale deposit, but under the effect of regularly blowback, a small amount of deposition and acidizing fluid in ceramic filter core and the draught tube are blown away, consequently, the condition that deposition, scale deposit and corrosion sensor can be avoided to this embodiment to appear, can realize again that stable, reliable, accurately measure. This application collects flue gas water conservancy diversion, heating, blowback as an organic whole, is applicable to in comparatively abominable "fixed pollution source fume emission continuous monitoring" operating mode, realizes not having deposition, scale deposit, does not have acid liquor corrosion sensor and stable, reliable, accurately measuring effect.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (10)
1. An online hygrometer sampling device, comprising:
the flow guide part of the sampling mechanism is arranged opposite to the direction of the airflow;
the signal processing unit is connected with the sampling mechanism through a probe tube and completes signal conversion, display and output;
and the blowback pipe penetrates through the probe pipe and is communicated with the sampling mechanism, wherein compressed air is introduced into the blowback pipe.
2. The on-line hygrometer sampling device of claim 1,
the sampling mechanism comprises a flow guide pipe, a ceramic filter element and a fixed bracket,
the ceramic filter element is arranged inside the flow guide pipe and communicated with the back flushing pipe, one end of the fixed support is used for mounting the ceramic filter element, and the other end of the fixed support is provided with a humidity sensor, a temperature sensor, a heating module and a back flushing pipe;
the temperature sensor, the heating module and the temperature control unit are used for heating the fixed support to enable the temperature of the fixed support to be close to 70-80 ℃;
the humidity sensor collects gaseous humidity signals filtered by the ceramic filter element and transmits the gaseous humidity signals to the signal processing unit through a circuit.
3. The on-line hygrometer sampling device of claim 2, wherein the sampling mechanism further comprises a baffle mounted inside and bisecting the draft tube, the draft tube having a shorter side and a longer side, wherein the shorter side is an air inlet and the longer side is an air outlet.
4. The on-line hygrometer sampling device of claim 3, wherein the baffle is a bent structure, wherein the front end of the baffle is bent toward the air inlet at a first included angle, and a line connecting the bent point of the baffle and the edge of the air inlet forms a second included angle with a plane where the rear end of the baffle is located.
5. The on-line hygrometer sampling device of claim 4, wherein the first included angle is 120-140 ° and the second included angle is 25-45 °.
6. The on-line hygrometer sampling device of claim 5 wherein the first included angle is 135 ° and the second included angle is 30 °.
7. The on-line hygrometer sampling device of any one of claims 1 to 6, wherein a solenoid valve is further disposed on the blowback pipe, and the solenoid valve is electrically connected to the signal processing unit through a cable.
8. The on-line hygrometer sampling device of any one of claims 1 to 6, wherein a pressure regulating filter is further disposed on the blowback pipe.
9. The on-line hygrometer sampling device of any one of claims 1 to 6, further comprising a protective shield disposed outside the signal processing unit.
10. The on-line hygrometer sampling device of any one of claims 1 to 6, wherein the pressure of the compressed air introduced into the blowback pipe is greater than 0.4MPa, and the flow rate is greater than 100L/min.
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| CN201921011180.8U CN210108395U (en) | 2019-06-28 | 2019-06-28 | Online hygrometer sampling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110220544A (en) * | 2019-06-28 | 2019-09-10 | 上海华川环保科技有限公司 | A kind of online hygrometer sampler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110220544A (en) * | 2019-06-28 | 2019-09-10 | 上海华川环保科技有限公司 | A kind of online hygrometer sampler |
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