CN212808040U - On-line detection device for ammonia in flue gas by using continuous sample injection analysis technology - Google Patents
On-line detection device for ammonia in flue gas by using continuous sample injection analysis technology Download PDFInfo
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Abstract
The utility model discloses an utilize ammonia on-line measuring device in flue gas of continuous sampling analytical technique, include: a gas production device, an absorption quantitative device, a continuous analysis device, an ammonia absorption efficiency check device and a gas flow rate control device; the gas production device and the absorption quantitative device are connected through an absorption liquid conveying pipe and a turbulence absorption pipe, the absorption quantitative device is connected with the gas flow control device through a gas conveying pipe, the absorption quantitative device is connected with the continuous analysis device through an absorption liquid discharging pipe, and the absorption liquid discharging pipe is connected with an ammonia absorption efficiency checking device in parallel. The utility model discloses an ammonia on-line measuring device in flue gas utilizes and advances a kind analytical technique in succession and adopts front end atomizing absorption to combine the secondary absorption to realize the continuous short-term test of ammonia high absorption rate in flue gas.
Description
Technical Field
The utility model relates to an environmental protection monitoring technology field, concretely relates to utilize ammonia on-line measuring device in flue gas of continuous sampling analytical technique.
Background
At present, 86% of units of coal-fired power plants in China realize ultralow emission of smoke pollutants, and a Selective Catalytic Reduction (SCR) technology is a mainstream technology in the ultralow emission technology of nitrogen oxides, and the technology needs to add reducing agent ammonia or urea into smoke to reduce the nitrogen oxides in the smoke into nitrogen. However, increased ammonia slip can result from operating conditions, stratification of gas flow, maldistribution of ammonia or NOx, or long catalyst operation. The problems of environmental pollution, shortened service life of the catalyst, corrosion of equipment and the like can be caused by the escaping ammonia, so that the monitoring of the escaping ammonia has very important significance. In the field of online monitoring and analysis of ammonia escape, the main monitoring and analysis technologies at home and abroad at present comprise a laser in-situ measurement method, a laser extraction measurement method, an ammonia gas sensitive electrode method and a spectrophotometry method.
The laser in-situ measurement method can monitor the concentration of NH3 in real time, and has the following disadvantages: firstly, the measurement result is greatly influenced by factors such as smoke concentration in a flue, flue vibration, flue temperature, pressure fluctuation and the like, and the method cannot carry out online calibration, so that the accuracy of the measurement result cannot be verified; secondly, due to the adoption of a direct measurement method, a plurality of factors influencing the measurement result are provided, and the stability of the measurement data cannot be ensured. And the optical device is easy to pollute and is influenced by factors such as flue vibration, thermal expansion, cold contraction and the like, so that the optical path is often required to be adjusted and maintained. Chinese patent application No. 201610313560.1 discloses an escape ammonia concentration detection device and method based on TDLAS technique, and this utility model omits the reference air chamber, has saved escape ammonia monitoring devices's development cost. The laser extraction measurement method is improved on the basis of a laser in-situ measurement method, and the system is regularly calibrated, so that the influences of factors such as smoke concentration in a flue, flue vibration, flue temperature, pressure fluctuation and the like are eliminated. Chinese patent application No. 201610207209.4 discloses a denitration ammonia escape integration on-line monitoring appearance, and this utility model provides a but the defect that exists in the laser extraction technique, provide one kind simultaneous measurement multiple gas, effectively avoid each component mutual interference's denitration ammonia escape integration on-line monitoring appearance. However, the laser measurement method has the problems that the smoke concentration in the flue is high, the lenses of the transmitting end and the receiving end of the system are easily blocked, the instrument has no reading or data jumping, the system structure is complex, the use and maintenance cost is high, and the like, and still cannot be solved. According to the research on the online prediction method for the ammonia escape concentration of the SCR flue gas denitration system, the cross section area of a flue at the outlet of an SCR reactor is large, the ammonia nitrogen molar ratio distribution is uneven after ammonia spraying, and the representativeness of the online detection value of the ammonia escape is low. The problem of distortion of the result of measuring ammonia in the smoke by using a laser method is also proved.
The ammonia gas sensitive electrode method has the advantages of high detection speed, easy operation and the like. US 7771654B 1 discloses a gas device for monitoring the composition of flue gases, using an ammonia sensor to measure the ammonia concentration. Chinese patent application No. 201410626972.1 discloses an online monitoring and analyzing method and apparatus for ammonia escape, which provides an extraction type sampling method after the defect of the in-situ laser method is studied, and uses ammonia gas sensitive electrode method to detect the escaped ammonia. Chinese patent application No. 201510363313.8 discloses a device and a method for on-line continuous monitoring of escaped ammonia in a denitration system, which realize the on-line continuous monitoring of escaped ammonia through an ammonium ion electrode and a pH meter. Chinese patent application No. 201510201370.6 discloses an online detection device and method for ammonia escaping by a gas-liquid transfer method, in which ammonia gas enters into an absorption liquid after being dried and separated from gas-liquid, and the mass concentration of ammonia nitrogen is measured by a water quality ammonia nitrogen sensor. Meanwhile, the water quality ammonia nitrogen sensor is a multi-parameter chemical sensor and consists of a temperature sensor, a pH electrode and an ammonia gas sensitive electrode, and the defects of the ammonia gas sensitive electrode are analyzed in documents of escape ammonia detection system research based on tunable laser absorption spectroscopy and escape ammonia detection system research based on tuned laser absorption spectroscopy: the selectivity and stability are poor, the influence of the environment is large, and the requirements of the electrode method on the sample environment, the electrode state and the maintenance are high.
The manual ammonia gas detection method is mainly a spectrophotometry method which has the advantages of high sensitivity, good selectivity and the like. Chinese patent application No. 200910303619.9 discloses an absorption cuvette and an ammonia nitrogen online monitoring titration method, and provides a novel device integrating a reaction container and the cuvette and an online titration method. Chinese patent application No. 201510638435.3 discloses an online ammonia slip concentration measuring device and measuring method based on a liquid absorption method, which analyzes the defects of a laser measuring method and does not describe in detail how to efficiently and accurately detect the slip ammonia.
Chinese patent application No. 201510953799.0 discloses a device and method for measuring ammonia content in flue gas by colorimetry, the utility model provides an utilize the colorimetry principle to carry out measuring method and device to escaping ammonia in the flue gas, can transfer the ammonia in the flue gas to liquid in the gaseous state after handling to carry out accurate ration to the absorption liquid, add the chemical reagent of accurate measurement, then the colour development in the absorption liquid ratio look device, then measure the absorbance of colour development liquid. And (4) converting ammonia in the flue gas according to the absorbance of the absorption liquid. The patent adopts a nano-grade reagent spectrophotometry, the method has high requirement on the stability of working conditions, is long in time consumption and is not suitable for continuous monitoring, and the nano-grade reagent used by the method contains toxic substances mercury iodide or mercuric chloride which are harmful to human health. In the document "method for measuring ammonia escape concentration of flue gas denitration device in coal-fired power plant", different methods for measuring ammonia are compared, and the result shows that the method for measuring ammonia escape concentration in flue gas is preferably an indophenol blue spectrophotometry, which is also an arbitration method for measuring ammonia in air. Indophenol blue spectrophotometry is prescribed as a method for analyzing ammonia in flue gas in Japanese Industrial Standard "method for analyzing ammonia in flue gas" (JISK 0099-2004).
In summary, the existing ammonia on-line analyzer can not solve the problem of monitoring ammonia in flue gas well, and a new detection method and device are urgently needed to be developed for accurately and rapidly monitoring escaped ammonia.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize ammonia on-line measuring device in flue gas of advancing kind analytical technique in succession, it can realize the continuous short-term test of ammonia high absorption rate in flue gas.
In order to achieve the above object, the utility model provides an utilize ammonia on-line measuring device in flue gas of continuous sampling analytical technique, include: a gas production device, an absorption quantitative device, a continuous analysis device, an ammonia absorption efficiency check device and a gas flow rate control device; the gas production device and the absorption quantitative device are connected through an absorption liquid conveying pipe and a turbulence absorption pipe, the absorption quantitative device is connected with the gas flow control device through a gas conveying pipe, the absorption quantitative device is connected with the continuous analysis device through an absorption liquid discharging pipe, and the absorption liquid discharging pipe is connected with an ammonia absorption efficiency checking device in parallel.
In a preferred embodiment, the gas production apparatus comprises: the filter is arranged at the flue gas inlet end and is used for filtering flue gas; the gas production pipe is connected with the outlet of the filter through a gas inlet; one end of the purging pipe is connected with the filter, and the other end of the purging pipe is connected with compressed air; the primary absorber is connected with the gas production pipe and is provided with an absorption liquid inlet pipe, a gas inlet and a gas-liquid mixture outlet pipe, wherein the gas-liquid mixture outlet pipe is connected with one end of the turbulent flow absorption pipe; and the heater is sleeved outside the gas production pipe, and the heating temperature range of the heater is 40-350 ℃.
In a preferred embodiment, the absorption dosing device comprises: the outlet of the absorption liquid delivery pump is connected with an absorption liquid inlet pipe of the primary absorber through an absorption liquid delivery pipe; the absorption liquid storage tank is connected with the inlet of the absorption liquid delivery pump through an absorption liquid delivery pipe; the glass sand core filter is characterized in that an air inlet of the glass sand core filter is connected with the other end of the turbulent flow absorption pipe, wherein the filtering efficiency of the glass sand core filter on particles with the kinetic diameter of more than or equal to 0.1 mu m is more than 99.9%; the inlet of the gas inlet pipe of the absorption bottle is connected with the outlet of the glass sand core filter through a turbulent flow absorption pipe, the gas outlet of the absorption bottle is connected with the inlet of the first gas-liquid separator through a gas conveying pipe, and the bottom of the absorption bottle is provided with an absorption liquid outlet; one end of the absorption liquid discharge pipe is connected with the absorption liquid discharge port, the other end of the absorption liquid discharge pipe is connected with the inlet of the absorption liquid discharge pump, the absorption liquid discharge pipe is provided with a liquid flow meter, one path of the outlet of the absorption liquid discharge pump is connected with the continuous analysis device, and the other path of the outlet of the absorption liquid discharge pump is connected with the waste liquid tank.
In a preferred embodiment, the gas flow control device comprises: gas condensing equipment, mass flow meter, gas sampling pump and gas tightness detection device, wherein, gas condensing equipment's entry is connected with first vapour and liquid separator's export through gas delivery pipe, and gas condensing equipment's export is connected with mass flow meter's entry through gas delivery pipe, and mass flow meter's export is connected with gas sampling pump's entry through gas delivery pipe, and gas tightness detection device is oxygen sensor.
In a preferred embodiment, the ammonia absorption efficiency check device includes: the checking bottle is connected with an outlet of the absorption liquid discharge pump, one end of the second gas-liquid separator is connected with the checking bottle, and the other end of the second gas-liquid separator is connected with the conveying pump.
In a preferred embodiment, the online detection device for ammonia in flue gas further comprises a control display device, and the control display device is respectively connected with the control units of the gas production device, the absorption quantitative device, the continuous analysis device, the ammonia absorption efficiency check device and the gas flow control device.
In a preferred embodiment, the gas production pipe is made of Hastelloy materials, and the diameter range of the gas production pipe is 0.5mm-10 mm; the absorption liquid delivery pipe and the turbulent flow absorption pipe are made of one of a silicone tube, a Teflon tube and a PP tube, and the diameter range of the turbulent flow absorption pipe is 0.5mm-10 mm; the volume of the absorption bottle is 3mL-100mL, and the absorption bottle, the first gas-liquid separator and the second gas-liquid separator are made of glass or quartz materials.
In a preferred embodiment, the continuous analysis device is a continuous flow ammonia nitrogen analyzer or a continuous injection ammonia nitrogen analyzer.
In a preferred embodiment, the blowing pipe adopts compressed air to blow and remove dust in the filter in a pulse mode, the pressure of the compressed air is 0.2-1.0MPa, and the blowing interval is 30min-10 h; the purging time is 10s-120 s.
Compared with the prior art, the utility model discloses an utilize ammonia on-line measuring device in flue gas of continuous sampling analysis technique's beneficial effect as follows: the utility model discloses an ammonia on-line measuring device in flue gas is provided with gas production device, absorption proportioning device, continuous analysis device, ammonia absorption efficiency check device, gas flow control device and control display device, adopts the ammonia concentration in the chemical absorption spectrophotometry detects the flue gas, utilizes continuous analysis technique and adopts front end atomizing absorption to combine the secondary absorption to realize the continuous short-term test of ammonia high absorption rate in the flue gas.
Drawings
Fig. 1 is a schematic structural diagram of an ammonia online detection device in flue gas according to a preferred embodiment of the present invention.
Description of reference numerals:
1-gas production device, 11-filter, 12-gas production tube, 13-purging tube, 14-heater, 15-primary absorber, 16-absorption liquid inlet tube, 17-gas-liquid mixture outlet tube, 18-compressed air, 2-absorption quantitative device, 21-absorption liquid storage tank, 22-absorption liquid delivery tube, 23-absorption liquid delivery pump, 24-turbulence absorption tube, 25-glass sand core filter, 26-absorption bottle, 27-first gas-liquid separator, 28-absorption liquid discharge pump, 29-absorption liquid discharge tube, 291-liquid flowmeter, 292-waste liquid tank, 3-gas flow control device, 31-gas delivery tube, 32-gas condensing device, 33-mass flowmeter, 34-gas sampling pump, 35-airtightness detection device, 4-continuous analysis device, 5-ammonia absorption efficiency checking device, 51-checking bottle, 52-second gas-liquid separator, 53-delivery pump and 6-control display device.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, all belong to the protection scope of the present invention.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component. The terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one technical feature from another. The modifier "about" used in connection with a quantity is inclusive of the stated value and the meaning dictated by the context. (e.g., it contains errors in measuring a particular quantity).
As shown in fig. 1, the device for detecting ammonia in flue gas according to a preferred embodiment of the present invention includes: a gas production device 1, an absorption quantitative device 2, a continuous analysis device 4, an ammonia absorption efficiency check device 5, a gas flow rate control device 3, and a control display device 6. The gas production device 1 is connected with the absorption quantitative device 2 through an absorption liquid conveying pipe 22 and a turbulent flow absorption pipe 24, the absorption quantitative device 2 is connected with the gas flow control device 3 through a gas conveying pipe 31, the absorption quantitative device 2 is connected with the continuous analysis device 4 through an absorption liquid discharging pipe 29, the absorption liquid discharging pipe 29 is connected with the ammonia absorption efficiency check device 5 in parallel, and the control display device 6 is respectively connected with the control units of the gas production device 1, the absorption quantitative device 2, the continuous analysis device 4, the ammonia absorption efficiency check device 5 and the gas flow control device 3 so as to control all the control elements and display control parameters.
In a preferred embodiment, the gas production device 1 comprises: filter 11, gas production pipe 12, purge pipe 13, heater 14 and primary absorber 15. The filter 11 is arranged at the flue gas inlet end and used for filtering the flue gas. The filter 11 has a filtering efficiency of more than 99.5% for particles with a kinetic diameter of more than or equal to 0.35 μm. The gas inlet of the gas production pipe 12 is connected with the outlet of the filter 11. The purge pipe 13 is connected to the filter 11 at one end and to the compressed air 18 at the other end. The primary absorber 15 is connected with the gas production pipe 12, an absorption liquid inlet pipe, a gas inlet and a gas-liquid mixture outlet pipe 17 are arranged on the primary absorber 15, wherein the gas-liquid mixture outlet pipe 17 is connected with one end of the turbulent flow absorption pipe 24. The heater 14 is sleeved outside the gas production pipe 12, and the heating temperature range of the heater 14 is 40-350 ℃.
In a preferred embodiment, the absorption dosing device 2 comprises: an absorption liquid storage tank 21, an absorption liquid delivery pipe 22, an absorption liquid delivery pump 23, a turbulent absorption pipe 24, a sand core glass filter 25, an absorption bottle 26, a first gas-liquid separator 27, an absorption liquid discharge pump 28, an absorption liquid discharge pipe 29, a liquid flow meter 291, and a waste liquid tank 292. The outlet of the absorption liquid feed pump 23 is connected to the absorption liquid inlet pipe of the primary absorber 15 through the absorption liquid feed pipe 22. The absorption liquid storage tank 21 is connected to an inlet of an absorption liquid feed pump 23 through an absorption liquid feed pipe 22. The air inlet of the glass sand core filter 25 is connected with the other end of the turbulent absorption pipe 24. Wherein, the filtering efficiency of the glass sand core filter on the particulate matters with the kinetic diameter of more than or equal to 0.1 mu m is more than 99.9 percent. The inlet of the air inlet pipe of the absorption bottle 26 is connected with the outlet of the glass sand core filter through a turbulent absorption pipe 24, the gas outlet of the absorption bottle 26 is connected with the inlet of the first gas-liquid separator 27 through a gas conveying pipe 31, and the bottom of the absorption bottle 26 is provided with an absorption liquid discharge port. One end of the absorption liquid discharge pipe 29 is connected to the absorption liquid discharge port, the other end of the absorption liquid discharge pipe 29 is connected to the inlet of the absorption liquid discharge pump 28, and a liquid flow meter 291 is mounted on the absorption liquid discharge pipe 29. One path of the outlet of the absorption liquid discharge pump 28 is connected to the continuous analyzer 4, and the other path is connected to the waste liquid tank 292.
In a preferred embodiment, the gas flow control device 3 comprises: a gas condensing device 32, a mass flow meter 33, a gas sampling pump 34, and a gas tightness detecting device 35. Wherein, the inlet of the gas condensing device 32 is connected with the outlet of the first gas-liquid separator 27 through the gas conveying pipe 31, the outlet of the gas condensing device 32 is connected with the inlet of the mass flow meter 33 through the gas conveying pipe 31, and the outlet of the mass flow meter 33 is connected with the inlet of the gas sampling pump 34 through the gas conveying pipe 31. Preferably, the airtightness detecting means 35 is an oxygen sensor.
In a preferred embodiment, the continuous analysis device 4 is a continuous flow ammonia nitrogen analyzer or a continuous injection ammonia nitrogen analyzer.
In a preferred embodiment, the ammonia absorption efficiency check device 5 includes: a check bottle 51, a second gas-liquid separator 52 and a transfer pump 53, wherein the check bottle 51 is connected to the outlet of the absorption liquid discharge pump 28, and one end of the second gas-liquid separator 52 is connected to the check bottle 51 and the other end is connected to the transfer pump 53.
In a preferred embodiment, the gas production tube 12 is hastelloy material, and the diameter of the gas production tube 12 ranges from 0.5mm to 10 mm. The absorption liquid delivery pipe 22 and the turbulent flow absorption pipe 24 are made of one of a silicone tube, a Teflon tube and a PP tube, and the diameter of the turbulent flow absorption pipe 24 is 0.5mm-10 mm. The volume of the absorption bottle 26 is 3mL-100mL, and the absorption bottle 26, the first gas-liquid separator 27 and the second gas-liquid separator 52 are made of glass or quartz.
In another preferred embodiment, the gas production tube 12 is hastelloy material, and the diameter of the gas production tube 12 is 8 mm. The filter 11 is made of Ha-type alloy material, the filtering efficiency of the filter 11 to particulate matters with the kinetic diameter of more than or equal to 0.35 mu m is more than 99.5 percent, the primary absorber 15, the absorption liquid conveying pipe 22 and the turbulent flow absorption pipe 24 are all made of Teflon material, and the absorption bottle and the gas-liquid separator are made of quartz material. The volume of the absorption bottle is 10ml, the pipe diameter of the turbulent absorption pipe is 8mm, and the heating temperature of the heater 14 is 300 ℃. And the continuous analysis device is a 4 continuous flow ammonia nitrogen analyzer.
In a preferred embodiment, the continuous analysis device is a continuous flow ammonia nitrogen analyzer or a continuous injection ammonia nitrogen analyzer.
The utility model discloses a test method of ammonia online device in flue gas, including following step: checking the air tightness of the whole set of device by using an air tightness checking device; continuously collecting flue gas in a flue, wherein the flow rate of the flue gas is 0.01-10L/min; the flue gas enters a primary absorber after passing through a filter and a gas production pipe in sequence, and the gas production pipe and the primary absorber are heated, wherein the heating temperature is 80-350 ℃; the ammonia gas enters a first-stage absorber, is contacted with absorption liquid from an absorption liquid storage tank, then enters an absorption bottle through a turbulent flow absorption pipe and a glass sand core filter, and the residual ammonia in the smoke gas in the absorption bottle is absorbed; after being separated from the absorption liquid in the absorption bottle, the flue gas is discharged from the top of the absorption bottle and sequentially passes through a gas condensing device, a mass flow meter and a gas sampling pump, wherein the mass flow meter records the volume of the gas; after absorption liquid in the absorption bottle sequentially passes through an absorption liquid discharge pipe, a liquid flowmeter and an absorption liquid discharge pump, part of the absorption liquid enters a continuous analysis device, and the concentration of ammonium ions in the absorption liquid is measured and obtained, wherein the volume of the absorption liquid is obtained through the liquid flowmeter or the absorption liquid discharge pump, the volume of flue gas is obtained through a mass flowmeter, the volume of flue gas is converted into the volume of gas under standard conditions, the ammonia concentration in the flue gas is obtained through calculation, and the ammonia concentration is displayed in a control display device; and discharging part of the absorption liquid and the waste liquid analyzed by the continuous analysis device into a waste liquid tank.
In a preferred embodiment, the absorption liquid is one or more aqueous solutions of sulfuric acid, hydrochloric acid, salicylic acid, phosphoric acid, ammonium sulfate and ammonium chloride, the concentration of the absorption liquid is 0.0001mol/L-0.5mol/L, the pH value of the absorption liquid is 1-7, and the flow rate of the absorption liquid is 0.1ml/min-10 ml/min.
In a preferred embodiment, a part of absorption liquid enters the continuous analysis device, 10% -100% of absorption liquid enters the continuous analysis device, and the absorption liquid enters the continuous analysis device in a continuous fixed flow mode, wherein the continuous analysis device is a continuous flow ammonia nitrogen analyzer, the absorption liquid enters the continuous flow ammonia nitrogen analyzer in a pulse mode, and the time interval is 0.1s-240 s. The display frequency of the ammonia concentration in the control display device is a numerical value from 0.1s to 240 s.
In a preferred embodiment, the detection method further includes: removing dust in the filter by using compressed air pulse type purging through a purging pipe, wherein the pressure of the compressed air is 0.2-1.0MPa, and the purging interval is 30min-10 h; the purging time is 10s-120 s.
In another preferred embodiment, the flue gas flow is 3L/min, and the gas production pipe 12 and the primary absorber 15 are heated to 300 ℃. The absorption solution is sulfuric acid solution, the concentration of the absorption solution is 0.05mol/L, the pH value of the absorption solution is 1, and the flow rate of the absorption solution is 2 ml/min. 20% of absorption liquid enters a continuous analysis device, the absorption liquid enters a continuous analyzer in a pulse mode, and the time interval is 20 s. The ammonia concentration is displayed in the control display device at a frequency of 20 s. Removing dust in the filter by using compressed air pulse type blowing, wherein the pressure of the compressed air is 1.0 MPa; the purging interval is 10 h; the purge time was 20 s.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an utilize ammonia on-line measuring device in flue gas of continuous injection analysis technique which characterized in that: the online detection device for ammonia in flue gas comprises: a gas production device, an absorption quantitative device, a continuous analysis device, an ammonia absorption efficiency check device and a gas flow rate control device; the gas production device is connected with the absorption quantitative device through an absorption liquid conveying pipe and a turbulence absorption pipe, the absorption quantitative device is connected with the gas flow control device through a gas conveying pipe, the absorption quantitative device is connected with the continuous analysis device through an absorption liquid discharging pipe, and the absorption liquid discharging pipe is connected with the ammonia absorption efficiency checking device in parallel.
2. The on-line detection device for ammonia in flue gas according to claim 1, characterized in that: the gas production device comprises:
the filter is arranged at the smoke inlet end and is used for filtering smoke;
the gas production pipe is connected with the outlet of the filter through a gas inlet;
one end of the purging pipe is connected with the filter, and the other end of the purging pipe is connected with compressed air;
the primary absorber is connected with the gas production pipe and is provided with an absorption liquid inlet pipe, a gas inlet and a gas-liquid mixture outlet pipe, and the gas-liquid mixture outlet pipe is connected with one end of the turbulent flow absorption pipe; and
the heater is sleeved outside the gas production pipe, and the heating temperature range of the heater is 40-350 ℃.
3. The on-line detection device for ammonia in flue gas according to claim 2, characterized in that: the absorption dosing device includes:
an outlet of the absorption liquid delivery pump is connected with the absorption liquid inlet pipe of the primary absorber through an absorption liquid delivery pipe;
the absorption liquid storage tank is connected with the inlet of the absorption liquid delivery pump through an absorption liquid delivery pipe;
the air inlet of the glass sand core filter is connected with the other end of the turbulent flow absorption pipe, wherein the filtering efficiency of the glass sand core filter on particulate matters with the kinetic diameter of more than or equal to 0.1 mu m is more than 99.9 percent,
the inlet of the gas inlet pipe of the absorption bottle is connected with the outlet of the glass sand core filter through a turbulence absorption pipe, the gas outlet of the absorption bottle is connected with the inlet of the first gas-liquid separator through a gas conveying pipe, and the bottom of the absorption bottle is provided with an absorption liquid outlet;
and one end of the absorption liquid discharge pipe is connected with the absorption liquid discharge port, the other end of the absorption liquid discharge pipe is connected with an inlet of an absorption liquid discharge pump, and the absorption liquid discharge pipe is provided with a liquid flow meter, wherein one path of an outlet of the absorption liquid discharge pump is connected with the continuous analysis device, and the other path of the outlet of the absorption liquid discharge pump is connected with the waste liquid tank.
4. The on-line detection device for ammonia in flue gas according to claim 3, characterized in that: the gas flow control device includes: the gas sampling device comprises a gas condensing device, a mass flow meter, a gas sampling pump and an air tightness detection device, wherein an inlet of the gas condensing device is connected with an outlet of the first gas-liquid separator through a gas conveying pipe, an outlet of the gas condensing device is connected with an inlet of the mass flow meter through a gas conveying pipe, an outlet of the mass flow meter is connected with an inlet of the gas sampling pump through a gas conveying pipe, and the air tightness detection device is an oxygen sensor.
5. The on-line detection device for ammonia in flue gas according to claim 3, characterized in that: the ammonia absorption efficiency check device includes: the checking device comprises a checking bottle, a second gas-liquid separator and a conveying pump, wherein the checking bottle is connected with an outlet of an absorption liquid discharge pump, one end of the second gas-liquid separator is connected with the checking bottle, and the other end of the second gas-liquid separator is connected with the conveying pump.
6. The on-line detection device for ammonia in flue gas according to claim 1, characterized in that: the on-line detection device for ammonia in flue gas further comprises a control display device, and the control display device is respectively connected with the control units of the gas production device, the absorption quantitative device, the continuous analysis device, the ammonia absorption efficiency check device and the gas flow control device.
7. The on-line detection device for ammonia in flue gas according to claim 3, characterized in that: the gas production pipe is made of Hastelloy materials, and the diameter range of the gas production pipe is 0.5mm-10 mm; the absorption liquid conveying pipe and the turbulent flow absorption pipe are made of one of a silicone tube, a Teflon tube and a PP tube, and the diameter range of the turbulent flow absorption pipe is 0.5-10 mm; the volume of the absorption bottle is 3-100 mL, and the absorption bottle, the first gas-liquid separator and the second gas-liquid separator are made of glass or quartz materials.
8. The on-line detection device for ammonia in flue gas according to claim 1, characterized in that: the continuous analysis device is a continuous flow ammonia nitrogen analyzer or a continuous injection ammonia nitrogen analyzer.
9. The on-line detection device for ammonia in flue gas according to claim 2, characterized in that: the blowing pipe blows and removes dust in the filter by adopting compressed air in a pulse mode, the pressure of the compressed air is 0.2-1.0MPa, and the blowing interval is 30min-10 h; the purging time is 10s-120 s.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116381153A (en) * | 2023-04-11 | 2023-07-04 | 安徽华西稀有金属材料有限公司 | Method and device for detecting pH value of molybdenum concentrate by continuously adding ammonia through oxygen pressure ammonia leaching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116381153A (en) * | 2023-04-11 | 2023-07-04 | 安徽华西稀有金属材料有限公司 | Method and device for detecting pH value of molybdenum concentrate by continuously adding ammonia through oxygen pressure ammonia leaching |
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