CN109990848B - Denitration ammonia injection pipeline flow monitoring device with urea as reducing agent and application thereof - Google Patents
Denitration ammonia injection pipeline flow monitoring device with urea as reducing agent and application thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/54—Nitrogen compounds
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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- G01F1/42—Orifices or nozzles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D2251/20—Reductants
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Abstract
The invention discloses a denitration ammonia injection pipeline flow monitoring device with urea as a reducing agent, which comprises a high-temperature measuring pipeline, an upstream pressure-leading coil, an upstream connecting pipe, a downstream pressure-leading coil, a downstream connecting pipe and a differential pressure gauge, wherein the high-temperature measuring pipeline is connected with the upstream pressure-leading coil; the upstream pressure-inducing coil and the downstream pressure-inducing coil are respectively wound on the outer wall of the high-temperature measuring pipeline, and the winding turns of the upstream pressure-inducing coil and the downstream pressure-inducing coil are not less than 2 turns; one end of the upstream pressure guiding coil is communicated with the upstream in the high-temperature measuring pipeline, the other end of the upstream pressure guiding coil is connected with a high-pressure interface of the differential pressure gauge through an upstream connecting pipe, one end of the downstream pressure guiding coil is communicated with the downstream in the high-temperature measuring pipeline, and the other end of the downstream pressure guiding coil is connected with a low-pressure interface of the differential pressure gauge through a downstream connecting pipe. The device is particularly suitable for gas flow measurement of a large-caliber pipeline uneven flow field, has the technical advantages of high sensitivity, high accuracy, wide range ratio, small throttling loss, blockage prevention and the like, and is particularly suitable for occasions with the problems of condensation, crystallization and the like of partial components in a measured gas medium when meeting cold.
Description
Technical Field
The invention relates to a flow monitoring device of a denitration ammonia injection pipeline with urea as a reducing agent and application thereof, belonging to the technical field of gas flow measurement.
Background
The gas flow is an important parameter in industrial production process and scientific experiment measurement, and the flowmeter is a tool for measuring and testing the gas flow. The gas flow measurement is an important component of energy measurement, and has important functions of ensuring product quality, improving production efficiency, saving energy and promoting scientific and technological development.
The gas flow measurement is very dependent on the application conditions, and the influencing factors comprise the gas type, the flow condition, the field application working condition and the like. In a laboratory, the flowmeter can obtain extremely high precision, but in case of large change of gas conditions or environmental conditions in field application, the precision cannot be guaranteed, and even normal use cannot be performed.
Common gas flowmeters are classified according to principles, and can be roughly classified into differential pressure flowmeters, thermal flowmeters, turbine flowmeters, vortex shedding flowmeters, ultrasonic flowmeters, and the like. Among them, the differential pressure type flowmeter is most widely used, and the specific structural types are more.
The orifice plate flowmeter is one of the common differential pressure flowmeters, and uses the static pressure difference generated when fluid flows through the orifice plate as a primary measurement signal, and the primary measurement signal is output by a pressure leading pipe, converted into an electric signal by a differential pressure transducer, and then converted into a corresponding flow value by configuration to be displayed. The throttle orifice plate is generally designed in a single-hole mode and a multi-hole mode, the requirement of the multi-hole throttle orifice plate on the uniformity of measured gas is relatively low, namely the requirement on a straight pipe section at the upstream of a measuring section is relatively short.
Including porous plate gas flowmeter's differential pressure flowmeter in, on the pressure differential gauge must all connect measured differential pressure signal to through the pressure-drawing pipe, when having phenomenons such as condensation, crystallization to measuring gas part composition, cause the pressure-drawing pipe very easily and block up, and then lead to the unable normal use of flowmeter. For example, the conventional differential pressure type flowmeter is applied to a denitration ammonia injection pipeline flow monitoring occasion (in an ammonia production process by urea pyrolysis or hydrolysis, the medium temperature is about 300 ℃ generally after dilution air mixing), when the measured medium temperature is lower than 200 ℃, the phenomenon of urea condensation or even crystallization can exist, and further, the pressure guiding pipe of the differential pressure type flowmeter is blocked. Although the pressure leading pipe can be heated by heat tracing technology to relieve the blockage problem, the traditional heat tracing technology is difficult to reach more than 200 ℃, and the reliability of the traditional heat tracing technology is difficult to ensure.
Disclosure of Invention
In order to solve the difficulty that part of components in the measured gas are condensed and crystallized when cooled in the prior art, such as the flow measurement of a denitration ammonia injection pipeline with common reducing agent urea, the invention provides a special flow monitoring device which simultaneously deals with the technical difficulty.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a denitration ammonia injection pipeline flow monitoring device with urea as a reducing agent comprises a high-temperature measuring pipeline, an upstream pressure-leading coil, an upstream connecting pipe, a downstream pressure-leading coil, a downstream connecting pipe and a differential pressure gauge; the upstream pressure-inducing coil and the downstream pressure-inducing coil are respectively wound on the outer wall of the high-temperature measuring pipeline, and the winding turns of the upstream pressure-inducing coil and the downstream pressure-inducing coil are not less than 2 turns; one end of the upstream pressure guiding coil is communicated with the upstream in the high-temperature measuring pipeline, the other end of the upstream pressure guiding coil is connected with a high-pressure interface of the differential pressure gauge through an upstream connecting pipe, one end of the downstream pressure guiding coil is communicated with the downstream in the high-temperature measuring pipeline, and the other end of the downstream pressure guiding coil is connected with a low-pressure interface of the differential pressure gauge through a downstream connecting pipe.
The upstream and the downstream in the high-temperature measuring pipeline are determined according to the flow direction of a medium in the high-temperature measuring pipeline in use, namely the direction from the upstream to the downstream is consistent with the flow direction of the medium; the high pressure interface and the low pressure interface of the differential pressure gauge are two conventional interfaces, and are divided according to the high pressure and the low pressure of the connected air pressure, and the common knowledge is provided.
The device can be used in a denitration ammonia injection pipeline with urea as a reducing agent, and measures the flow of dilution air containing pyrolysis or hydrolysis urea in a denitration system; of course, the method can also be used for monitoring the flow of other gases prone to condensation.
During the use, install high temperature measurement pipeline in the pipeline that awaits measuring along the pipeline axial that awaits measuring, the differential pressure gauge is installed outside the pipeline that awaits measuring, and concrete mounting means and position are decided according to concrete operating mode, and this application does not have the special limitation to this.
The applicant finds that the upstream pressure guiding coil and the downstream pressure guiding coil are wound on the outer wall of the high-temperature measuring pipeline, the temperature level is high, and the upstream pressure guiding coil and the downstream pressure guiding coil are not easy to be blocked due to condensation, crystallization and the like of gases such as urea and the like, namely the high-temperature state of the upstream pressure guiding coil and the downstream pressure guiding coil is kept by utilizing the heat of a medium in the high-temperature measuring pipeline, which is equivalent to self-heat tracing, and the reduction of the operation reliability of the flow monitoring device caused by the increase of heat tracing equipment is avoided.
In order to further overcome the difficulties of low flow velocity, uneven flow field and the like faced by the measurement of the gas flow in the large-diameter pipeline, improve the sensitivity and accuracy of the measurement and improve the adaptability to the uneven flow field, the flow monitoring device also comprises a throttle orifice plate which is arranged in the high-temperature measurement pipeline, the end of an upstream pressure-inducing coil communicated with the upstream in the high-temperature measurement pipeline is positioned at the upstream of the throttle orifice plate, and the end of a downstream pressure-inducing coil communicated with the downstream in the high-temperature measurement pipeline is positioned at the downstream of the throttle orifice plate. That is, one end of the upstream pressure inducing coil is communicated with the upstream space of the orifice plate in the high-temperature measuring pipeline, the other end of the upstream pressure inducing coil is connected with the high-pressure interface of the differential pressure gauge through the upstream connecting pipe, one end of the downstream pressure inducing coil is communicated with the downstream space of the orifice plate in the high-temperature measuring pipeline, and the other end of the downstream pressure inducing coil is connected with the low-pressure interface of the differential pressure gauge through the downstream connecting pipe.
Preferably, in order to improve the adaptability of the flow monitoring device to a non-uniform flow field, the orifice plate is a porous orifice plate.
In order to prevent condensation and crystallization of urea and the like caused by temperature reduction of the upstream pressure leading coil and the downstream pressure leading coil, the upstream pressure leading coil and the downstream pressure leading coil are both coated with insulating layers, and the temperature of the outer surfaces of the insulating layers is not more than 50 ℃.
In order to prevent the condensation and crystallization of urea in the upstream connecting pipe and the downstream connecting pipe caused by the molecular diffusion effect, the denitration ammonia injection pipeline flow monitoring device with the reducing agent of urea further comprises a back flushing pipeline, and the upstream connecting pipe and the downstream connecting pipe are respectively communicated with the back flushing pipeline. And the upstream connecting pipe and the downstream connecting pipe are subjected to timing purging or purging according to requirements by using a back-flushing pipeline.
Preferably, compressed air is used for respectively carrying out timing back flushing on the upstream connecting pipe and the downstream connecting pipe through a back flushing pipeline; the time interval of the upstream connecting pipe for the timed back flushing is 15 min-180 min; the time interval of the downstream connecting pipe for the timed back flushing is 15 min-180 min.
The applicant has found, through research, that the substance NH which causes the condensation and crystallization of urea3、CO2、H2The O molecules are diffused to the upstream connecting pipe and the downstream connecting pipe from the upstream pressure-inducing coil pipe and the downstream pressure-inducing coil pipe due to the irregular characteristic of molecular diffusionAnd the urea condensation and crystallization phenomena in the upstream connecting pipe and the downstream connecting pipe can be avoided by utilizing compressed air to perform regular back flushing when the urea is not diffused to leave a high-temperature zone. The compressed air back blowing interval time is generally 15-180 min, and is determined according to the coiling length of the upstream pressure-inducing coil and the downstream pressure-inducing coil, wherein the longer the length is, the longer the compressed air back blowing interval time can be set, and the setting principle is to ensure NH3、CO2、H2And the O molecules are not diffused into the upstream connecting pipe and the downstream connecting pipe all the time, and back flushing is carried out before the O molecules are diffused out of the high-temperature area each time.
In order to enhance the maintainability of the flow monitoring device, an upstream inspection cavity is arranged between the upstream pressure-leading coil and the upstream connecting pipe, the upstream inspection cavity is respectively communicated with the upstream pressure-leading coil and the upstream connecting pipe, and an upstream plug is arranged on the upstream inspection cavity; and a downstream inspection cavity is arranged between the downstream pressure-leading coil and the downstream connecting pipe, the downstream inspection cavity is respectively communicated with the downstream pressure-leading coil and the downstream connecting pipe, and a downstream plug is arranged on the downstream inspection cavity. Once NH is described above3、CO2、H2The O molecules diffuse out of the high-temperature area, namely, the O molecules are firstly condensed and crystallized in the upstream and downstream inspection cavities, and the upstream and downstream plugs are opened for inspection and cleaning.
In order to further enhance the maintainability of the flow monitoring device, an upstream isolation valve is arranged on the upstream connecting pipe, and a downstream isolation valve is arranged on the downstream connecting pipe. When the flow monitoring device is in a working state, the upstream isolation valve and the downstream isolation valve need to be opened; when the upstream pressure guiding coil, the upstream inspection cavity, the downstream pressure guiding coil, the downstream inspection cavity and the like need to be inspected and cleaned, the upstream isolation valve and the downstream isolation valve are closed.
In order to facilitate installation and use, mounting flanges are respectively arranged at two ends of the high-temperature measuring pipeline.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The denitration ammonia injection pipeline flow monitoring device with the urea as the reducing agent can effectively prevent blockage, and is particularly suitable for measuring the flow of ammonia-air mixed gas in a denitration ammonia injection pipeline with the urea as the reducing agent in the occasions of measuring the problems of condensation, crystallization and the like of partial components in a gas medium when meeting cold; the gas flowmeter is further suitable for gas flow measurement of a large-caliber pipeline uneven flow field, and has the technical advantages of high sensitivity, high accuracy, wide range ratio, small throttling loss, blockage prevention and the like.
Drawings
FIG. 1 is a front view of a denitration ammonia injection pipeline flow monitoring device with urea as a reducing agent (a differential pressure gauge is omitted);
FIG. 2 is a perspective view of a denitration ammonia injection pipeline flow monitoring device with urea as a reducing agent according to the present invention;
in the figure, 1 is a high-temperature measuring pipeline, 2 is an upstream pressure-leading coil pipe, 3 is a downstream pressure-leading coil pipe, 4 is a differential pressure gauge, 5 is a throttle orifice, 6 is a timing back-blowing pipeline, 7 is an upstream connecting pipe, 8 is a downstream connecting pipe, 9 is an upstream checking cavity, 10 is an upstream plug, 11 is a downstream checking cavity, 12 is a downstream plug, 13 is an upstream isolating valve, 14 is a downstream isolating valve, 15 is a mounting flange, and 16 is a medium flow direction.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
A denitration ammonia injection pipeline flow monitoring device with urea as a reducing agent comprises a high-temperature measuring pipeline, an upstream pressure-leading coil, an upstream connecting pipe, a downstream pressure-leading coil, a downstream connecting pipe and a differential pressure gauge; the upstream pressure-inducing coil and the downstream pressure-inducing coil are respectively coiled on the outer wall of the high-temperature measuring pipeline, and the coiling number of turns of the upstream pressure-inducing coil and the downstream pressure-inducing coil is more than or equal to 2 (for example, 9, 11 or 15 turns can be respectively used); one end of the upstream pressure guiding coil is communicated with the upstream in the high-temperature measuring pipeline, the other end of the upstream pressure guiding coil is connected with a high-pressure interface of the differential pressure gauge through an upstream connecting pipe, one end of the downstream pressure guiding coil is communicated with the downstream in the high-temperature measuring pipeline, and the other end of the downstream pressure guiding coil is connected with a low-pressure interface of the differential pressure gauge through a downstream connecting pipe.
The device can be used in a denitration ammonia injection pipeline with urea as a reducing agent, and measures the flow of dilution air containing pyrolysis or hydrolysis urea in a denitration system; of course, the method can also be used for monitoring the flow of other gases prone to condensation.
Practice proves that the upstream pressure guiding coil and the downstream pressure guiding coil are wound on the outer wall of the high-temperature measuring pipeline, the temperature level is high, and the phenomena of blockage caused by condensation, crystallization and the like of gases such as urea and the like are not easy to occur in the upstream pressure guiding coil and the downstream pressure guiding coil, namely the high-temperature state of the upstream pressure guiding coil and the downstream pressure guiding coil is kept by utilizing the heat of a medium in the high-temperature measuring pipeline, which is equivalent to self-heat tracing, and the reduction of the operation reliability of the flow monitoring device caused by the increase of heat tracing equipment is avoided.
Example 2
On the basis of the embodiment 1, the following improvements are further made: in order to improve the sensitivity and accuracy of measurement and improve the adaptability to uneven flow fields, the flow monitoring device further comprises a throttle orifice plate, the throttle orifice plate is installed in the high-temperature measurement pipeline, the end, communicated with the upstream in the high-temperature measurement pipeline, of the upstream pressure-inducing coil is located at the upstream of the throttle orifice plate, and the end, communicated with the downstream in the high-temperature measurement pipeline, of the downstream pressure-inducing coil is located at the downstream of the throttle orifice plate. That is, one end of the upstream pressure inducing coil is communicated with the upstream space of the orifice plate in the high-temperature measuring pipeline, the other end of the upstream pressure inducing coil is connected with the high-pressure interface of the differential pressure gauge through the upstream connecting pipe, one end of the downstream pressure inducing coil is communicated with the downstream space of the orifice plate in the high-temperature measuring pipeline, and the other end of the downstream pressure inducing coil is connected with the low-pressure interface of the differential pressure gauge through the downstream connecting pipe.
Example 3
On the basis of the embodiment 2, the following improvements are further made: in order to improve the adaptability of the flow monitoring device to uneven flow fields, the throttling orifice plate is a porous throttling orifice plate.
Example 4
On the basis of the embodiment 3, the following improvements are further made: in order to prevent condensation and crystallization of urea and the like caused by temperature reduction of the upstream pressure leading coil and the downstream pressure leading coil, the upstream pressure leading coil and the downstream pressure leading coil are both coated with insulating layers, and the temperature of the outer surfaces of the insulating layers is not more than 50 ℃.
Example 5
On the basis of the embodiment 4, the following improvements are further made: in order to prevent the condensation and crystallization of urea in the upstream connecting pipe and the downstream connecting pipe caused by the molecular diffusion effect, the denitration ammonia injection pipeline flow monitoring device with the reducing agent of urea further comprises a back flushing pipeline, and the upstream connecting pipe and the downstream connecting pipe are respectively communicated with the back flushing pipeline. And the upstream connecting pipe and the downstream connecting pipe are subjected to timing purging or purging according to requirements by using a back-flushing pipeline. Compressed air can be used for respectively carrying out timing back flushing on the upstream connecting pipe and the downstream connecting pipe through a back flushing pipeline; the time interval of the upstream connecting pipe for the timed back flushing is 15 min-180 min; the time interval of the downstream connecting pipe for the timed back flushing is 15 min-180 min.
Practice proves that the substance NH causes condensation and crystallization of urea3、CO2、H2The O molecules are diffused to the upstream connecting pipe and the downstream connecting pipe from the upstream pressure-inducing coil and the downstream pressure-inducing coil, long time is needed due to the irregular characteristic of molecular diffusion, and when the O molecules are not diffused to leave a high-temperature region, the O molecules are regularly blown back by utilizing compressed air, so that the phenomena of urea condensation and crystallization in the upstream connecting pipe and the downstream connecting pipe can be avoided. The compressed air back blowing interval time is generally 15-180 min, and is determined according to the coiling length of the upstream pressure-inducing coil and the downstream pressure-inducing coil, wherein the longer the length is, the longer the compressed air back blowing interval time can be set, and the setting principle is to ensure NH3、CO2、H2And the O molecules are not diffused into the upstream connecting pipe and the downstream connecting pipe all the time, and back flushing is carried out before the O molecules are diffused out of the high-temperature area each time.
Example 6
On the basis of the embodiment 5, the following improvements are further made: in order to enhance the maintainability of the flow monitoring device, an upstream inspection cavity is arranged between the upstream pressure-leading coil and the upstream connecting pipe, the upstream inspection cavity is respectively communicated with the upstream pressure-leading coil and the upstream connecting pipe, and an upstream plug is arranged on the upstream inspection cavity; and a downstream inspection cavity is arranged between the downstream pressure-leading coil and the downstream connecting pipe, the downstream inspection cavity is respectively communicated with the downstream pressure-leading coil and the downstream connecting pipe, and a downstream plug is arranged on the downstream inspection cavity. Once NH is described above3、CO2、H2Diffusion of O moleculesAnd (4) leaving the high-temperature area, namely, firstly condensing and crystallizing in the upstream and downstream inspection cavities, and opening the upstream and downstream plugs for inspection and cleaning.
Example 7
On the basis of the embodiment 6, the following improvements are further made: in order to further enhance the maintainability of the flow monitoring device, an upstream isolation valve is arranged on the upstream connecting pipe, and a downstream isolation valve is arranged on the downstream connecting pipe. When the flow monitoring device is in a working state, the upstream isolation valve and the downstream isolation valve need to be opened; when the upstream pressure guiding coil, the upstream inspection cavity, the downstream pressure guiding coil, the downstream inspection cavity and the like need to be inspected and cleaned, the upstream isolation valve and the downstream isolation valve are closed.
Example 8
On the basis of the embodiment 7, the following improvements are further made: in order to facilitate installation and use, mounting flanges are respectively arranged at two ends of the high-temperature measuring pipeline.
The long-term practice proves that the denitration ammonia injection pipeline flow monitoring device using urea as the reducing agent in each example is particularly suitable for gas flow measurement of a large-diameter pipeline uneven flow field, has the technical advantages of high sensitivity, high accuracy, wide range ratio, small throttling loss, blockage prevention and the like, and is particularly suitable for measuring the flow of ammonia-air mixed gas in a denitration ammonia injection pipeline using urea as the reducing agent in the occasions of measuring the problems of condensation, crystallization and the like of partial components in a gas medium when meeting cold.
Claims (9)
1. The utility model provides a reductant is denitration ammonia injection pipeline flow monitoring device of urea which characterized in that: the device comprises a high-temperature measuring pipeline, an upstream pressure-leading coil, an upstream connecting pipe, a downstream pressure-leading coil, a downstream connecting pipe, a differential pressure gauge and a back-flushing pipeline; the upstream pressure-inducing coil and the downstream pressure-inducing coil are respectively wound on the outer wall of the high-temperature measuring pipeline, and the winding turns of the upstream pressure-inducing coil and the downstream pressure-inducing coil are not less than 2 turns; one end of the upstream pressure guiding coil is communicated with the upstream in the high-temperature measuring pipeline, the other end of the upstream pressure guiding coil is connected with a high-pressure interface of the differential pressure gauge through an upstream connecting pipe, one end of the downstream pressure guiding coil is communicated with the downstream in the high-temperature measuring pipeline, and the other end of the downstream pressure guiding coil is communicated with the downstream in the high-temperature measuring pipeline through a downstreamThe connecting pipe is connected with a low-pressure interface of the differential pressure gauge; the upstream connecting pipe and the downstream connecting pipe are respectively communicated with a back flushing pipeline at NH3、CO2And H2Before the O molecules are diffused to the upstream connecting pipe and the downstream connecting pipe, compressed air is utilized to carry out back flushing on the upstream connecting pipe and the downstream connecting pipe through a back flushing pipeline respectively.
2. The denitration ammonia injection pipeline flow monitoring device with the reducing agent of urea according to claim 1, characterized in that: the high-temperature measuring device also comprises a throttle orifice plate, the throttle orifice plate is arranged in the high-temperature measuring pipeline, the communicated end of the upstream pressure-inducing coil and the upstream in the high-temperature measuring pipeline is positioned at the upstream of the throttle orifice plate, and the communicated end of the downstream pressure-inducing coil and the downstream in the high-temperature measuring pipeline is positioned at the downstream of the throttle orifice plate.
3. The denitration ammonia injection pipeline flow monitoring device with the reducing agent of urea according to claim 2, characterized in that: the throttle orifice is a porous throttle orifice.
4. The denitration ammonia injection pipeline flow rate monitoring device of which the reducing agent is urea according to any one of claims 1 to 3, characterized in that: the upstream pressure guiding coil and the downstream pressure guiding coil are both coated by the heat-insulating layer, and the temperature of the outer surface of the heat-insulating layer is ensured not to exceed 50 ℃.
5. The denitration ammonia injection pipeline flow rate monitoring device of which the reducing agent is urea according to any one of claims 1 to 3, characterized in that: compressed air is utilized to respectively perform timing back flushing on the upstream connecting pipe and the downstream connecting pipe through a back flushing pipeline; the time interval of the upstream connecting pipe for the timed back flushing is 15 min-180 min; the time interval of the downstream connecting pipe for the timed back flushing is 15 min-180 min.
6. The denitration ammonia injection pipeline flow rate monitoring device of which the reducing agent is urea according to any one of claims 1 to 3, characterized in that: an upstream check cavity is arranged between the upstream pressure-inducing coil and the upstream connecting pipe, the upstream check cavity is respectively communicated with the upstream pressure-inducing coil and the upstream connecting pipe, and an upstream plug is arranged on the upstream check cavity; and a downstream inspection cavity is arranged between the downstream pressure-leading coil and the downstream connecting pipe, the downstream inspection cavity is respectively communicated with the downstream pressure-leading coil and the downstream connecting pipe, and a downstream plug is arranged on the downstream inspection cavity.
7. The denitration ammonia injection pipeline flow monitoring device with the reducing agent of urea according to claim 6, characterized in that: the upstream connecting pipe is provided with an upstream isolating valve, and the downstream connecting pipe is provided with a downstream isolating valve.
8. The denitration ammonia injection pipeline flow rate monitoring device of which the reducing agent is urea according to any one of claims 1 to 3, characterized in that: mounting flanges are respectively arranged at two ends of the high-temperature measuring pipeline.
9. The use of a denitration ammonia injection line flow monitoring device with a reducing agent of any one of claims 1 to 8, wherein the denitration ammonia injection line flow monitoring device comprises: a dilute air flow that is used for the reductant to spout the ammonia pipeline for the denitration of urea, measures the denitration system and contains pyrolysis or urea of hydrolysising.
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| CN210570856U (en) * | 2019-11-18 | 2020-05-19 | 南京科远智慧科技集团股份有限公司 | Self-cleaning anti-blocking type differential pressure type ammonia-air mixed gas flow measuring device |
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| CN104132682A (en) * | 2014-08-04 | 2014-11-05 | 张寒军 | Instrument self-heat-tracing temperature adjusting module |
| CN210570856U (en) * | 2019-11-18 | 2020-05-19 | 南京科远智慧科技集团股份有限公司 | Self-cleaning anti-blocking type differential pressure type ammonia-air mixed gas flow measuring device |
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Denomination of invention: A flow monitoring device for denitration ammonia injection pipeline with reducing agent urea and its application Effective date of registration: 20220406 Granted publication date: 20201002 Pledgee: China Construction Bank Corporation Nanjing Gulou sub branch Pledgor: NANJING BOWO SCIENCE & TECHNOLOGY DEVELOPMENT CO.,LTD. Registration number: Y2022980003948 |