CN204556600U - A kind of gas-liquid transfer method escape ammonia on-line measuring device - Google Patents
A kind of gas-liquid transfer method escape ammonia on-line measuring device Download PDFInfo
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- CN204556600U CN204556600U CN201520256338.3U CN201520256338U CN204556600U CN 204556600 U CN204556600 U CN 204556600U CN 201520256338 U CN201520256338 U CN 201520256338U CN 204556600 U CN204556600 U CN 204556600U
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Abstract
The utility model discloses a kind of gas-liquid transfer method escape ammonia on-line measuring device, comprise liquid flowmeter, absorbing liquid supply system, smoke filter, liquid film heat exchange absorption tube, gas-liquid primary separator, flow cell, Measurement and Control System, for detecting NH contained by absorbing liquid in flow cell
4 +the Water quality ammonia nitrogen sensor of concentration and the liquid density sensor for the density that detects liquid in flow cell; The utility model can accurately detect escape ammonia concentration online.
Description
Technical field
The utility model relates to a kind of on-line measuring device, is specifically related to a kind of gas-liquid transfer method escape ammonia on-line measuring device.
Background technology
At present, China generally starts to put into operation based on the fuel-burning power plant equipment for denitrifying flue gas of SCR and SNCR technique.The safe operation of size to upstream device of SCR, SNCR device outlet escape ammonia (in flue gas unreacted ammonia concentration) is most important, and SCR device all requires to control within 3 μ L/L usually, and SNCR requires to control within 10 μ L/L usually.Because in operation, the change of flue gas condition and catalyst activity can affect the size of escape ammonia, be ensure upstream device safe operation, online escape ammonia pick-up unit is all equipped with in existing SNCR and SCR device outlet, makes operations staff be able to Real-Time Monitoring.
But existing online escape ammonia monitoring device practical operation situation can not meet detection requirement, also only can reflect trend, cannot provide the accuracy of detection of needs when best.The measuring principle of these devices is local laser method, and problem main contributor is: due to NH
3absorption spectrum and H
2o is close, and the interference of moisture is difficult to eliminate; Original position Method for Installation cannot be avoided by the impact of dustiness size in flue gas; Transmitting and receiving sensor is arranged on flue, because the changes such as temperature can cause expansion or the contraction of flue, cannot avoid the skew of light.But, in power plant's operational process, steam soot blowing and lifting load all can cause the significantly change of flue gas moisture, ash concentration, flue-gas temperature, and therefore, the escape ammonia on-Line Monitor Device based on local laser method generally adopted at present exists the difficulty that cannot overcome from principle.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, and provide a kind of gas-liquid transfer method escape ammonia on-line measuring device, this device can accurately detect escape ammonia concentration online.
For achieving the above object, gas-liquid transfer method escape ammonia on-line measuring device described in the utility model comprise liquid flowmeter, absorbing liquid supply system, smoke filter, liquid film heat exchange absorption tube, gas-liquid primary separator, flow cell, Measurement and Control System, for detecting NH contained by absorbing liquid in flow cell
4 +the Water quality ammonia nitrogen sensor of concentration;
Described smoke filter is positioned at smoke conveying duct to be detected, the outlet of smoke filter is connected with the smoke inlet of liquid film heat exchange absorption tube, the absorbing liquid outlet of absorbing liquid supply system is connected with the absorbing liquid entrance of liquid film heat exchange absorption tube, and the gas liquid outlet of liquid film heat exchange absorption tube is connected with the gas-liquid entrance of gas-liquid primary separator;
The exhanst gas outlet of gas-liquid primary separator is connected by the entrance of gas meter with flue gas sampling pump, and flue gas sampling delivery side of pump place is provided with the oxygen concentration sensor for detecting oxygen concentration in flue gas;
The absorbing liquid outlet of gas-liquid primary separator is connected with the liquid inlet of flow cell, and the liquid outlet of flow cell is connected with the liquid inlet of liquid flowmeter;
The output terminal of the output terminal of the input end of Measurement and Control System and the output terminal of liquid density sensor, oxygen concentration sensor, the output terminal of Water quality ammonia nitrogen sensor, the output terminal of liquid flowmeter and gas meter is connected.
Also comprise circulating water machine, the water inlet of circulating water machine is connected with the coolant outlet of liquid film heat exchange absorption tube, the cooling water inlet of liquid film heat exchange absorption tube is connected with the coolant outlet of gas-liquid primary separator, and the cooling water inlet of gas-liquid primary separator is connected with the water delivering orifice of circulating water machine.
The absorbing liquid outlet of gas-liquid primary separator is connected by gas-liquid draw-off pump with the liquid inlet of flow cell.
Described fluid flow counts uncovered liquid flowmeter;
Described uncovered liquid flowmeter comprises liquid trap, fluid level transmitter, electromagnetic pulse metering pump, controller and the fluid level transmitter for the liquid level information that detects liquid in liquid trap, the output terminal of fluid level transmitter is connected with the input end of controller, the control end that output terminal and the electromagnetic pulse of controller measure pump is connected, the liquid outlet bottom the electromagnetic pulse metering liquid inlet of pump and liquid trap;
The entrance of described liquid trap is connected with the liquid outlet of flow cell.
Described liquid film heat exchange absorption tube comprises absorbing liquid distributor chamber, flue gas transfer tube, liquid circulation room, smoke backflow cooling chamber and deep cooling coil pipe;
Described absorbing liquid distributor chamber is provided with absorbing liquid entrance and absorbing liquid outlet, smoke backflow cooling chamber is positioned at liquid circulation indoor, the outlet of flue gas transfer tube and the absorbing liquid outlet of absorbing liquid distributor chamber are all connected with the entrance at smoke backflow cooling chamber top, the upper end of deep cooling coil pipe is connected with the outlet bottom smoke backflow cooling chamber through the bottom of liquid circulation room, and the side at upper and lower two ends, liquid circulation room is respectively equipped with cooling liquid outlet and liquid coolant entrance;
The described entrance of flue gas transfer tube is connected with the outlet of smoke filter, the absorbing liquid entrance of absorbing liquid distributor chamber exports with the absorbing liquid of absorbing liquid supply system and is connected, the cooling water inlet of liquid circulation room is connected with the coolant outlet of gas-liquid primary separator, the coolant outlet of liquid circulation room is connected with the water inlet of circulating water machine, the gas liquid outlet of deep cooling coil pipe lower end and the gas-liquid entrance of gas-liquid primary separator.
The utility model has following beneficial effect:
Gas-liquid transfer method escape ammonia on-line measuring device described in the utility model is in testing process, the particle in flue gas is first filled into by smoke filter, the ammonia in flue gas is absorbed again by the absorbing liquid in liquid film heat exchange absorption tube, and drying is carried out to flue gas, absorbing liquid and dried flue gas are after gas-liquid primary separator, isolated flue gas and absorbing liquid enter into flue gas sampling pump and flow cell respectively, and according to the density of absorbing liquid in flow cell, the mass concentration of ammonia nitrogen in absorbing liquid in flow cell, the absorbing liquid flow of flow cell liquid outlet, the volumetric flow rate of the flue gas that gas-liquid primary separator is separated, and the volumetric concentration of oxygen obtains the escape ammonia concentration of flue gas in flue gas sampling pump discharge place flue gas, thus realize the on-line checkingi of the escape ammonia concentration of flue gas, the precision detected is high, can be used for the level improving denitrating flue gas equipment, practicality is extremely strong,
Further, the fluid flow in the utility model counts the uncovered liquid flowmeter of the flow that can detect small amount of water, and accuracy of detection is high;
Further, liquid film heat exchange absorption tube in the utility model comprises absorbing liquid distributor chamber, flue gas transfer tube, liquid circulation room, smoke backflow cooling chamber and deep cooling coil pipe, in cooled flue gas and when absorbing in flue gas ammonia, liquid coolant forms one deck liquid film at the inwall of smoke backflow cooling chamber, thus the ammonia in flue gas is all absorbed in absorbing liquid, and then the accuracy of detection of the escape ammonia concentration of raising flue gas.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of liquid flowmeter 10 in the utility model;
Fig. 3 is the structural representation of liquid film heat exchange absorption tube 2 in the utility model.
Wherein, 1 be smoke filter, 2 for liquid film heat exchange absorption tube, 3 for absorbing liquid supply system, 4 for circulating water machine, 5 for gas-liquid primary separator, 6 for gas meter, 7 for flue gas sampling pump, 8 for gas-liquid draw-off pump, 9 for flow cell, 10 for liquid flowmeter, 11 for liquid trap, 12 for fluid level transmitter, 13 for controller, 14 for electromagnetic pulse metering pump, 15 for flue gas transfer tube, 16 for absorbing liquid distributor chamber, 17 for smoke backflow cooling chamber, 18 for liquid circulation room, 19 for liquid film, 20 be deep cooling coil pipe.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to figure 1, gas-liquid transfer method escape ammonia on-line measuring device described in the utility model comprise liquid flowmeter 10, absorbing liquid supply system 3, smoke filter 1, liquid film heat exchange absorption tube 2, gas-liquid primary separator 5, flow cell 9, Measurement and Control System, for detecting NH contained by absorbing liquid in flow cell 9
4 +the Water quality ammonia nitrogen sensor of concentration; Smoke filter 1 is placed in smoke conveying duct to be detected, the outlet of smoke filter 1 is connected with the smoke inlet of liquid film heat exchange absorption tube 2, the absorbing liquid outlet of absorbing liquid supply system 3 is connected with the absorbing liquid entrance of liquid film heat exchange absorption tube 2, and the gas liquid outlet of liquid film heat exchange absorption tube 2 is connected with the gas-liquid entrance of gas-liquid primary separator 5; The exhanst gas outlet of gas-liquid primary separator 5 is connected by the entrance of gas meter 6 with flue gas sampling pump 7, and the exit of flue gas sampling pump 7 is provided with the oxygen concentration sensor for detecting oxygen concentration in flue gas; The absorbing liquid outlet of gas-liquid primary separator 5 is connected with the liquid inlet of flow cell 9, and the liquid outlet of flow cell 9 is connected with the liquid inlet of liquid flowmeter 10; The input end of Measurement and Control System is connected with the output terminal of the output terminal of the output terminal of oxygen concentration sensor, Water quality ammonia nitrogen sensor, the output terminal of liquid flowmeter 10 and gas meter 6.
The utility model also comprises circulating water machine 4, the water inlet of circulating water machine 4 is connected with the coolant outlet of liquid film heat exchange absorption tube 2, the cooling water inlet of liquid film heat exchange absorption tube 2 is connected with the coolant outlet of gas-liquid primary separator 5, and the cooling water inlet of gas-liquid primary separator 5 is connected with the water delivering orifice of circulating water machine 4; The absorbing liquid outlet of gas-liquid primary separator 5 is connected by gas-liquid draw-off pump 8 with the liquid inlet of flow cell 9; Liquid flowmeter 10 is uncovered liquid flowmeter, described uncovered liquid flowmeter comprises liquid trap 11, fluid level transmitter 12, electromagnetic pulse metering pump 14, controller 13 and the fluid level transmitter 12 for the liquid level information that detects liquid in liquid trap 11, the output terminal of fluid level transmitter 12 is connected with the input end of controller 13, the control end that output terminal and the electromagnetic pulse of controller 13 measure pump 14 is connected, the liquid outlet bottom the electromagnetic pulse metering liquid inlet of pump 14 and liquid trap 11; The entrance of liquid trap 11 is connected with the liquid outlet of flow cell 9.
Described liquid film heat exchange absorption tube 2 comprises absorbing liquid distributor chamber 16, flue gas transfer tube 15, liquid circulation room 18, smoke backflow cooling chamber 17 and deep cooling coil pipe 20; Absorbing liquid distributor chamber 16 is provided with absorbing liquid entrance and absorbing liquid outlet, smoke backflow cooling chamber 17 is positioned at liquid circulation room 18, the outlet of flue gas transfer tube 15 and the absorbing liquid outlet of absorbing liquid distributor chamber 16 are all connected with the entrance at smoke backflow cooling chamber 17 top, the upper end of deep cooling coil pipe 20 is connected with the outlet bottom smoke backflow cooling chamber 17 through the bottom of liquid circulation room 18, and the side at two ends, liquid circulation room about 18 is respectively equipped with cooling liquid outlet and liquid coolant entrance; The entrance of flue gas transfer tube 15 is connected with the outlet of smoke filter 1, the absorbing liquid entrance of absorbing liquid distributor chamber 16 exports with the absorbing liquid of absorbing liquid supply system 3 and is connected, the cooling water inlet of liquid circulation room 18 is connected with the coolant outlet of gas-liquid primary separator 5, the coolant outlet of liquid circulation room 18 is connected with the water inlet of circulating water machine 4, the gas liquid outlet of deep cooling coil pipe 20 lower end and the gas-liquid entrance of gas-liquid primary separator 5.
The course of work of the present utility model is:
Flue gas in smoke conveying duct to be detected enters into smoke filter 1, and filter out particle in flue gas by smoke filter 1, enter into liquid film heat exchange absorption tube 2 again, liquid film heat exchange absorption tube 2 sponges the ammonia in flue gas by absorbing liquid, and drying is carried out to flue gas, then absorbing liquid and dried flue gas are transported to gas-liquid primary separator 5 and carry out gas-liquid separation, wherein, the absorbing liquid separated enters into flow cell 9, absorbing liquid in flow cell 9 enters into liquid flowmeter 10, the flue gas separated enters into flue gas sampling pump 7 through gas meter 6, and discharged by flue gas sampling pump 7,
Gas meter 6 detects the volume flow Q of the flue gas that gas-liquid primary separator 5 is separated in real time
v. flue gas, and by the volume flow Q of described flue gas
v. flue gasbe forwarded in Measurement and Control System; The volumetric concentration of oxygen in the flue gas of oxygen concentration sensor Real-Time Monitoring flue gas sampling pump 7 exit
and by the volumetric concentration of oxygen in described flue gas
be forwarded in Measurement and Control System; Water quality ammonia nitrogen sensor detects the mass concentration of ammonia nitrogen in absorbing liquid in flow cell 9 in real time
and by the mass concentration of ammonia nitrogen in described absorbing liquid
be forwarded in Measurement and Control System; Liquid flowmeter 10 detects the flow Q of flow cell 9 liquid outlet absorbing liquid in real time
v liquid, and by the flow Q of described flow cell 9 liquid outlet absorbing liquid
v liquidbe forwarded in Measurement and Control System;
Measurement and Control System is according to the volume flow Q of described flue gas
v. flue gas, the volumetric concentration of oxygen in flue gas
the mass concentration of ammonia nitrogen in absorbing liquid
the density p of absorbing liquid
liquid(the 1000kg/m of water intaking
3) and the flow Q of flow cell 9 liquid outlet absorbing liquid
v liquidobtain the escape ammonia concentration C of flue gas
nH3, flue gas, wherein
In the utility model, the principle of work of liquid film heat exchange absorption tube 2 is:
Absorbing liquid enters in smoke backflow cooling chamber 17 through absorbing liquid distributor chamber 16, and on the inwall of smoke backflow cooling chamber 17, form one deck liquid film 19, the cooling liquid inlet of liquid coolant through liquid circulation room 18 enters into liquid circulation room 18, and discharge from the cooling liquid outlet of liquid circulation room 18, realize the cooling of the wall to deep cooling coil pipe 20 and smoke backflow cooling chamber 17, by realizing the cooling to liquid film 19 to the cooling of smoke backflow cooling chamber 17 wall.High-temperature flue gas filters out after more than 2 microns flue dust through upstream smoke filter 1, smoke backflow cooling chamber 17 is entered into by flue gas transfer tube 15, and formation center is downward in smoke backflow cooling chamber 17, smoke backflow upwards near surrounding liquid film 19, high-temperature flue gas by constantly colliding on liquid film 19, make flue gas cool-down, and the ammonia in flue gas is sponged by liquid film 19, when flue gas and absorbing liquid enter into deep cooling coil pipe 20 entrance, the temperature of flue gas is down to less than 80 DEG C, after flue gas and absorbing liquid enter into deep cooling coil pipe 20, the temperature of flue gas is reduced further, ammonia in flue gas is all transferred in liquid, in flue gas, original water vapor all condenses in absorbing liquid and makes flue gas drying, finally discharge from the outlet of deep cooling coil pipe 20 lower end.
In the utility model, the principle of work of liquid flowmeter 10 is:
The opening of liquid through liquid trap 11 top enters into liquid trap 11, fluid level transmitter 12 detects the liquid level information of liquid in liquid trap 11 in real time, and described liquid level information is forwarded in comparer, whether the liquid level that controller 13 judges in current liquid trap 11 according to described liquid level information is greater than default liquid level threshold values, when the liquid level in current liquid trap 11 is greater than default liquid level threshold values, then accumulate once, send pulsatile once signal again, described pulse signal enters into electromagnetic pulse metering pump 14, making electromagnetic pulse measure pump 14 works once, the a part of liquid in liquid trap 11 discharged by electromagnetic pulse metering pump 14, along with the inflow of liquid, in liquid trap 11, the liquid level of liquid is greater than default liquid level threshold values, then electromagnetic pulse metering pump 14 in work once, controller 13 accumulates once again.After the one-time detection cycle completes, the accumulated value A that controller 13 is cumulative, and obtain the flow Q of absorbing liquid according to described accumulated value A, the electromagnetic pulse metering pump 14 liquid volume B that once discharges and sense cycle C that works
v liquid, wherein, Q
v liquid=A.B/C.
Claims (5)
1. a gas-liquid transfer method escape ammonia on-line measuring device, it is characterized in that, comprise liquid flowmeter (10), absorbing liquid supply system (3), smoke filter (1), liquid film heat exchange absorption tube (2), gas-liquid primary separator (5), flow cell (9), Measurement and Control System, for detecting NH contained by flow cell (9) interior absorbing liquid
4 +the Water quality ammonia nitrogen sensor of concentration;
Described smoke filter (1) is positioned at smoke conveying duct to be detected, the outlet of smoke filter (1) is connected with the smoke inlet of liquid film heat exchange absorption tube (2), the absorbing liquid outlet of absorbing liquid supply system (3) is connected with the absorbing liquid entrance of liquid film heat exchange absorption tube (2), and the gas liquid outlet of liquid film heat exchange absorption tube (2) is connected with the gas-liquid entrance of gas-liquid primary separator (5);
The exhanst gas outlet of gas-liquid primary separator (5) is connected by the entrance of gas meter (6) with flue gas sampling pump (7), and the exit of flue gas sampling pump (7) is provided with the oxygen concentration sensor for detecting oxygen concentration in flue gas;
The absorbing liquid outlet of gas-liquid primary separator (5) is connected with the liquid inlet of flow cell (9), and the liquid outlet of flow cell (9) is connected with the liquid inlet of liquid flowmeter (10);
The input end of Measurement and Control System is connected with the output terminal of the output terminal of the output terminal of oxygen concentration sensor, Water quality ammonia nitrogen sensor, the output terminal of liquid flowmeter (10) and gas meter (6).
2. gas-liquid transfer method escape ammonia on-line measuring device according to claim 1, it is characterized in that, also comprise circulating water machine (4), the water inlet of circulating water machine (4) is connected with the coolant outlet of liquid film heat exchange absorption tube (2), the cooling water inlet of liquid film heat exchange absorption tube (2) is connected with the coolant outlet of gas-liquid primary separator (5), and the cooling water inlet of gas-liquid primary separator (5) is connected with the water delivering orifice of circulating water machine (4).
3. gas-liquid transfer method escape ammonia on-line measuring device according to claim 1, it is characterized in that, the absorbing liquid outlet of gas-liquid primary separator (5) is connected by gas-liquid draw-off pump (8) with the liquid inlet of flow cell (9).
4. gas-liquid transfer method escape ammonia on-line measuring device according to claim 1, is characterized in that, described liquid flowmeter (10) is uncovered liquid flowmeter;
Described uncovered liquid flowmeter (10) comprises liquid trap (11), fluid level transmitter (12), electromagnetic pulse metering pump (14), controller (13), and for the fluid level transmitter (12) of the liquid level information that detects liquid in liquid trap (11), the output terminal of fluid level transmitter (12) is connected with the input end of controller (13), the control end that output terminal and the electromagnetic pulse of controller (13) measure pump (14) is connected, the liquid outlet of the liquid inlet of electromagnetic pulse metering pump (14) and liquid trap (11) bottom,
The entrance of described liquid trap (11) is connected with the liquid outlet of flow cell (9).
5. gas-liquid transfer method escape ammonia on-line measuring device according to claim 1, it is characterized in that, described liquid film heat exchange absorption tube (2) comprises absorbing liquid distributor chamber (16), flue gas transfer tube (15), liquid circulation room (18), smoke backflow cooling chamber (17) and deep cooling coil pipe (20);
Described absorbing liquid distributor chamber (16) is provided with absorbing liquid entrance and absorbing liquid outlet, smoke backflow cooling chamber (17) is positioned at liquid circulation room (18), the outlet of flue gas transfer tube (15) and the absorbing liquid outlet of absorbing liquid distributor chamber (16) are all connected with the entrance at smoke backflow cooling chamber (17) top, the upper end of deep cooling coil pipe (20) is connected with the outlet bottom smoke backflow cooling chamber (17) through the bottom of liquid circulation room (18), the side at upper and lower two ends, liquid circulation room (18) is respectively equipped with cooling liquid outlet and liquid coolant entrance,
The entrance of described flue gas transfer tube (15) is connected with the outlet of smoke filter (1), the absorbing liquid entrance of absorbing liquid distributor chamber (16) exports with the absorbing liquid of absorbing liquid supply system (3) and is connected, the cooling water inlet of liquid circulation room (18) is connected with the coolant outlet of gas-liquid primary separator (5), the coolant outlet of liquid circulation room (18) is connected with the water inlet of circulating water machine (4), the gas liquid outlet of deep cooling coil pipe (20) lower end and the gas-liquid entrance of gas-liquid primary separator (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520256338.3U CN204556600U (en) | 2015-04-24 | 2015-04-24 | A kind of gas-liquid transfer method escape ammonia on-line measuring device |
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| CN201520256338.3U CN204556600U (en) | 2015-04-24 | 2015-04-24 | A kind of gas-liquid transfer method escape ammonia on-line measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807964A (en) * | 2015-04-24 | 2015-07-29 | 西安热工研究院有限公司 | On-line detection device and method for gas-liquid transfer method escaping ammonia |
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2015
- 2015-04-24 CN CN201520256338.3U patent/CN204556600U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807964A (en) * | 2015-04-24 | 2015-07-29 | 西安热工研究院有限公司 | On-line detection device and method for gas-liquid transfer method escaping ammonia |
| CN104807964B (en) * | 2015-04-24 | 2016-09-14 | 西安热工研究院有限公司 | A kind of gas-liquid transfer method escape ammonia on-line measuring device and method |
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Effective date of registration: 20170215 Address after: 100031 Beijing city Xicheng District Fuxingmen South Street No. 2 C Patentee after: Huaneng Power International, Inc. Patentee after: Xi'an Thermal Power Research Institute Co., Ltd. Patentee after: Xi'an Xire Boiler Environmental Protection Engineering Co., Ltd. Address before: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee before: Xi'an Thermal Power Research Institute Co., Ltd. Patentee before: Huaneng Group Technology Innovation Center Patentee before: Xi'an Xire Boiler Environmental Protection Engineering Co., Ltd. |