CN101281698A - Simulation platform and test method for flow field arrangement structure of flue gas denitration apparatus - Google Patents
Simulation platform and test method for flow field arrangement structure of flue gas denitration apparatus Download PDFInfo
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- CN101281698A CN101281698A CNA2008100619393A CN200810061939A CN101281698A CN 101281698 A CN101281698 A CN 101281698A CN A2008100619393 A CNA2008100619393 A CN A2008100619393A CN 200810061939 A CN200810061939 A CN 200810061939A CN 101281698 A CN101281698 A CN 101281698A
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Abstract
The invention discloses a simulating platform of the fume denitration device flow field distributing structure and a testing method. At present the denitration efficiency of the fume denitration device is greatly affected by the fume velocity distributing uniformity and the reducer ammonia gas/nitrogen oxide mixing uniformity. The invention includes an inlet pipe, a coal economizer, an inlet flue, a current stabilizing plate, a reactor, an outlet flue and a blower connected in turn, wherein an ash bucket is arranged at the round of the bottom of the inlet flue, and an air jetting device is arranged on the vertical section of the inlet flue. Guide plates located on the bottom of the top flue are arranged on the round of each flues. A plurality of layers of catalyzer are provided in the reactor, and a plurality of speed measuring holes are arranged at the entrance of the air jetting device and under the current stabilizing plate. The invention builds the simulating platform of the denitration device flow field structure, performs the experiment through the simulating platform, obtains the flow field distributing status of the denitration device, provides reasonable engineering measurement to improve the flow field distributing structure in the denitration system.
Description
Technical field
The present invention relates to a kind of analog platform of SCR (SCR) flow field arrangement structure of flue gas denitration apparatus that is applicable to heat power plant boiler and adopt the test method of this platform test Flow Field Distribution structure.
Background technology
Heat power plant boiler SCR equipment for denitrifying flue gas has the function that the pollutant oxides of nitrogen (NOx) in the flue gas is removed, to satisfy the pollutant qualified discharge in the power-plant flue gas.But; because the denitration efficiency of equipment for denitrifying flue gas is subjected to flue gas flow rate distributing homogeneity and reductive agent ammonia/oxides of nitrogen mixing uniformity to influence very big; inhomogeneous or the ammonia as velocity flow profile/oxides of nitrogen mixes inhomogeneous; to reduce denitration efficiency greatly; or generation clogging phenomenon; even cause the boiler tripping grinder, and bring negative effect for the safe operation of power plant, also can cause economic loss.
The Flow Field Distribution of heat power plant boiler SCR equipment for denitrifying flue gas and reductive agent gas and flue gas mix problem, be velocity distribution and reductive agent gas and the flue gas collision mixing phenomena that a hot flue gas flows in flue, reactor and produces, therefore how correctly simulating this complicated flow phenomenon and the distribution situation of correct simulation ammonia in flue gas, will be the key point of denitrification apparatus design.
Summary of the invention
Technical matters to be solved by this invention provides a kind of analog platform of SCR flow field arrangement structure of flue gas denitration apparatus, is used for the flow phenomenon and the correct distribution situation of simulating ammonia at flue gas of Simulation of Complex.
For this reason, the present invention adopts following technical scheme: the analog platform of flow field arrangement structure of flue gas denitration apparatus, it is characterized in that it comprises the inlet pipeline that connects successively, economizer, inlet flue duct, the top flue, homogenizing plate, reactor, exhaust pass and blower fan, an ash bucket is equipped with in the corner of inlet flue duct bottom, on vertical section of inlet flue duct a gas injection apparatus is housed, inlet flue duct, the corner of top flue is furnished with fair water fin, homogenizing plate is installed in the place, bottom of top flue, be placed with multi-layer catalyst in the reactor, a plurality of speed gaging holes respectively arranged in the porch of gas injection apparatus and the arranged beneath of homogenizing plate.The present invention is in order to improve Flow Field Distribution effect in the flue gas denitrification system of existing fuel-burning power plant, set up the analog platform of denitrification apparatus flow field structure, test by analog platform, obtain the Flow Field Distribution situation of denitrification apparatus, the Flow Field Distribution structure provides rational engineering measure in the denitrating system in order to improve.
The analog platform of above-mentioned flow field arrangement structure of flue gas denitration apparatus, described gas injection apparatus comprises the CO gas distribution tank, the jetting system housing, be installed in injection house steward, injection arm, nozzle and mixing tube on the housing, the outlet of CO gas distribution tank is connected by pipeline with the inlet that sprays house steward, the outlet of spraying house steward is connected with the injection arm, and nozzle is welded on the tapping that sprays on the arm, and mixing tube is installed in the exit of nozzle.By gas injection apparatus with CO gas and air mixed, thereby simulate mixing of ammonia and hot flue gas.
The analog platform of above-mentioned flow field arrangement structure of flue gas denitration apparatus, connect between the outlet of CO gas distribution tank and the inlet that sprays house steward stop valve and flowmeter, stop valve is used to control the flow of CO gas, and flowmeter is used to survey the flow of CO gas.
The analog platform of above-mentioned flow field arrangement structure of flue gas denitration apparatus, the front and back of inlet flue duct porch, gas injection apparatus, inlet flue duct outlet, homogenizing plate outlet, reactor outlet and exhaust pass exit are provided with the pressure gaging hole, come the calculating pressure loss according to the force value of surveying at above-mentioned gaging hole place.
The analog platform of above-mentioned flow field arrangement structure of flue gas denitration apparatus, the below of homogenizing plate is provided with silk ribbon, is used to observe the gas flow situation.
The analog platform of above-mentioned flow field arrangement structure of flue gas denitration apparatus, multi-layer catalyst is made up of reservation layer catalyzer, second layer catalyzer and the ground floor catalyzer placed from top to bottom, is consistent with the equipment for denitrifying flue gas of reality.
Analog platform of the present invention has the following advantages: 1, introduce cold air from inlet pipeline, and by measuring the speed of each gaging hole, the flowing of the hot flue gas of real simulation; 2, by the CO gas distribution tank, CO gas is injected in the flue, by measuring the CO gas concentration of each gaging hole, the real simulation ammonia mixes with hot flue gas.
Another object of the present invention is to utilize above-mentioned analog platform to carry out the flow field test, have following steps:
The first step, air that test is adopted carry out the boundary condition initialization, the boundary condition of described air has air themperature, flow velocity, Reynolds number;
Second step, each unit in the gas injection apparatus is carried out initialization, the unit of gas injection apparatus has: CO gas distribution tank, flowmeter, stop valve, injection house steward, spray arm, nozzle, mixing tube;
The 3rd step, adopt the homalographic ring method to measure the dynamic pressure that blower fan exports straight pipe cross section by Pitot tube, the average velocity in computer tube cross section then, calculate atmospheric density, thereby be converted into the air quantity under the mark attitude, adopt import current collector and microbarograph to measure the static pressure of inlet pipeline porch simultaneously, add the one's intention as revealed in what one says amount by static manometer, thereby flow is met the demands (by advancing by regulating blower fan, the air quantity of outlet relatively, obtain the coefficient of flow curve of import current collector, promptly draw the flow of blower fan outlet by the static pressure of current collector, in the test afterwards, flow with the import current collector is as the criterion, and the static pressure of promptly setting the inlet pipeline porch is determined the flow of blower fan outlet);
The 4th step: at speed gaging hole place hot-wire anemometer measuring speed;
The 5th step: adjust baffle arrangement, repeated for the 3rd to five step, satisfy testing requirements until Z-factor;
The 6th step: open the CO gas distribution tank, adjust to required flow, with CO gas concentration in the Rosemount NGA2000 apparatus measures air;
The 7th step: adjust compressor flow, repeated for first to seven step, carry out the test of a plurality of operating modes;
The 8th step: the velocity amplitude noted and CO gas concentration value be input to carry out data presentation, processing in the computing machine, flow field fractal structure and the CO gas concentration observed under different flow distribute.The situation that is evenly distributed is represented with Z-factor: C.V.=σ
V/ Vo * 100 (%),
σ
V: standard deviation (m/s),
Vo: average velocity (m/s),
Vi: speed (m/s) on the spot,
N: sampling spot quantity.
Consider the floor area of analog platform and the power supply supply of blower fan; be in together in the modelling district at the Reynolds number of test air and the Reynolds number of actual flue gas; the test model of setting up 1:15 has more economy; in addition; because ammonia is toxic gas; but, replace ammonia to test with CO gas, than used CO in the past by in order in air, to measure gas concentration
2Gas replaces ammonia to test, because CO in the atmosphere
2Content is far above CO, and the accuracy of testing with CO is far above CO
2Gas.
Test method of the present invention has the following advantages: 1, can be optimized design (as form, quantity, position etc.) to fair water fin, homogenizing plate, make Flow Field Distribution more even; 2, make crushing as far as possible little, it is applied in the actual device, thereby reduced of the influence of SCR system boiler draft system; 3, CO gas is evenly mixed with the test air.
The present invention is further illustrated below in conjunction with specification drawings and specific embodiments.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structure enlarged drawing (arrow among the figure is an air flow) of gas injection apparatus of the present invention.
Fig. 3 is that the A-A of Fig. 2 is to cut-open view.
Embodiment
As Figure 1-3, the analog platform of denitrification apparatus Flow Field Distribution structure is made up of inlet pipeline 1, economizer 2, inlet flue duct 3, ash bucket 4, gas injection apparatus 6, top flue 9, homogenizing plate 10, reactor 11, exhaust pass 13, blower fan 14; Described gas injection apparatus by CO gas distribution tank 15, stop valve 17, flowmeter 16, gas injection apparatus housing 61, be installed in injection house steward 62 on the housing 61, spray arm 63, nozzle 64 and mixing tube 65 and form.The outlet of CO gas distribution tank 15 is connected by pipeline with injection house steward 62 inlets, be in series with stop valve 17 and flowmeter 16 in the pipeline, spraying house steward's 62 outlets is connected with injection arm 63, nozzle 64 is welded on ammonia and sprays arm 63 tappings, mixing tube 65 is installed in the exit of nozzle 64, inlet pipeline 1 outlet is connected with economizer 2 inlets, economizer 2 outlets are connected with inlet flue duct 3 inlets, gas injection apparatus 6 is installed on the inlet flue duct 3 vertical sections, and ash bucket 4 is installed in 90 degree corners, inlet flue duct 3 bottoms; Inlet flue duct 3 outlets are connected with top flue 9 inlets; Homogenizing plate 10 is installed in top flue 9 bottom positions, and its outlet is connected with reactor 11, and the below of homogenizing plate is provided with silk ribbon, is convenient to observe the gas flow situation; Reservation layer catalyzer, second layer catalyzer and the ground floor catalyzer placed from top to bottom are housed in the reactor 11; Reactor 11 outlets are connected with the inlet of exhaust pass 13; The endpiece of exhaust pass 13 is connected with blower fan 14.The corner of inlet flue duct is furnished with inlet flue duct bottom fair water fin 5, inlet flue duct top fair water fin 7, top flue fair water fin 8, makes air-flow evenly by the flue corner.
Porch at gas injection apparatus is arranged 4 * 15 speed gaging holes, in the homogenizing plate arranged beneath 9 * 15 speed gaging holes is arranged, the front and back of inlet flue duct porch, gas injection apparatus, inlet flue duct outlet, homogenizing plate outlet, reactor outlet and exhaust pass exit all are provided with the pressure gaging hole, by measurement, thereby obtain Flow Field Distribution structure and CO gas concentration distribution situation in the denitrification apparatus to the air velocity and the CO gas concentration at these gaging hole places.
Using the flow field test method that above-mentioned analog platform carries out has the following steps:
The first step: initialization boundary condition, boundary condition has air themperature, air velocity (earlier blower fan to be left to maximum, peak load corresponding to physical device, turn flow on demand down thereafter), the air Reynolds number, it is same from the mould district to make that the flue gas Reynolds number of the Reynolds number of air flow in the model and physical device is in, and guarantees that the flow field of model and physical device has similarity
(when testing first blower fan is transferred to maximum quantity of wind, promptly corresponding to the maximum duty flow velocity of physical device.If under maximum duty, obtain satisfactory baffle arrangement, under the situation of littler air quantity, also should satisfy so, when carrying out follow-up test, can reduce the workload of adjusting fair water fin like this);
Second step: each unit condition in the initialization gas injection apparatus, the aperture of record stop valve;
The 3rd step: adopt the homalographic ring method to measure the dynamic pressure that blower fan exports straight pipe cross section by Pitot tube, the average velocity in computer tube cross section then, calculate atmospheric density, thereby be converted into the air quantity under the mark attitude, adopt import current collector and microbarograph to measure the static pressure of inlet pipeline porch simultaneously, add the one's intention as revealed in what one says amount by static manometer, thereby flow is met the demands (by advancing by regulating blower fan, the air quantity of outlet relatively, obtain the coefficient of flow curve of import current collector, promptly draw the flow of blower fan outlet by the static pressure of current collector, in the test afterwards, flow with the import current collector is as the criterion, and the static pressure of promptly setting the inlet pipeline porch is determined the flow of blower fan outlet);
The 4th step: go out to use the hot-wire anemometer measuring speed at the speed gaging hole;
The 5th step: adjust baffle arrangement, repeated for the 3rd to five step, satisfy testing requirements (Z-factor≤15%) until Z-factor;
The 6th step: open the CO gas distribution tank, adjust to required flow, with CO gas concentration in the Rosemount NGA2000 apparatus measures air, as not satisfying the CONCENTRATION DISTRIBUTION requirement, then adjust the valve opening of stop valve, remeasure the CO gas concentration, until meeting the demands;
The 7th step: adjust compressor flow, repeated for first to seven step, carry out the test of a plurality of operating modes;
The 8th step: the velocity amplitude noted and CO gas concentration value be input to carry out data presentation, processing in the computing machine, flow field fractal structure and the CO gas concentration observed under different flow distribute.
Validity for advance copy invention flow field arrangement structure of flue gas denitration apparatus analog platform, fair water fin quantity and layout that the present invention's test is obtained are applied in the actual fuel-burning power plant, each speed gaging hole and pressure gaging hole in the actual device are measured, and then drawn actual flow field distribution structure under each operating mode.
Claims (7)
1, the analog platform of flow field arrangement structure of flue gas denitration apparatus, it is characterized in that it comprises the inlet pipeline that connects successively, economizer, inlet flue duct, the top flue, homogenizing plate, reactor, exhaust pass and blower fan, an ash bucket is equipped with in the corner of inlet flue duct bottom, on vertical section of inlet flue duct a gas injection apparatus is housed, inlet flue duct, the corner of top flue is furnished with fair water fin, homogenizing plate is installed in the place, bottom of top flue, be placed with multi-layer catalyst in the reactor, a plurality of speed gaging holes arranged in the porch of gas injection apparatus and the arranged beneath of homogenizing plate.
2, the analog platform of flow field arrangement structure of flue gas denitration apparatus according to claim 1, it is characterized in that described gas injection apparatus comprises the CO gas distribution tank, the jetting system housing, be installed in injection house steward, injection arm, nozzle and mixing tube on the housing, the outlet of CO gas distribution tank is connected by pipeline with the inlet that sprays house steward, the outlet of spraying house steward is connected with the injection arm, nozzle is welded on the tapping that sprays on the arm, and mixing tube is installed in the exit of nozzle.
3, the analog platform of flow field arrangement structure of flue gas denitration apparatus according to claim 2 is characterized in that the outlet of CO gas distribution tank and sprays between house steward's the inlet being in series with stop valve and flowmeter.
4, the analog platform of flow field arrangement structure of flue gas denitration apparatus according to claim 1 is characterized in that front and back, inlet flue duct outlet, homogenizing plate outlet, reactor outlet and the exhaust pass exit of inlet flue duct porch, gas injection apparatus is provided with the pressure gaging hole.
5, the analog platform of flow field arrangement structure of flue gas denitration apparatus according to claim 1 is characterized in that the below of homogenizing plate is provided with silk ribbon.
6, the analog platform of flow field arrangement structure of flue gas denitration apparatus according to claim 1 is characterized in that described multi-layer catalyst is made up of reservation layer catalyzer, second layer catalyzer and the ground floor catalyzer placed from top to bottom.
7, the test method of utilizing each described analog platform of claim 1-6 to carry out is as follows:
The first step, the air that test is adopted carry out the boundary condition initialization, and the boundary condition of described air comprises the temperature of air, flow velocity, Reynolds number;
Second the step, each unit in the gas injection apparatus is carried out initialization;
The 3rd goes on foot, uses the homalographic ring method to measure the dynamic pressure in straight pipe cross section, blower fan exit, measures the porch static pressure of inlet pipeline simultaneously with import current collector and microbarograph, by the adjusting blower fan flow is met the demands;
The 4th the step, at speed gaging hole place measuring speed;
The 5th step, adjustment baffle arrangement repeated for the 3rd to five step, satisfied testing requirements until Z-factor;
The 6th the step, open the CO gas distribution tank, adjust to required flow, measure airborne CO gas concentration;
The 7th step, adjustment compressor flow repeated for first to seven step, carried out the test of a plurality of operating modes;
The 8th step, the velocity amplitude noted and CO gas concentration value be input to carry out data presentation, processing in the computing machine, thereby Flow Field Distribution structure and the CO gas concentration observed under different flow distribute, and the situation that is evenly distributed is represented with Z-factor: C.V.=σ
V/ Vo * 100 (%),
σ
V: standard deviation, unit are m/s,
Vo: average velocity, unit are m/s,
Vi: speed on the spot, unit is m/s,
N: sampling spot quantity.
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