CN111457418A - Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air - Google Patents
Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air Download PDFInfo
- Publication number
- CN111457418A CN111457418A CN202010274658.7A CN202010274658A CN111457418A CN 111457418 A CN111457418 A CN 111457418A CN 202010274658 A CN202010274658 A CN 202010274658A CN 111457418 A CN111457418 A CN 111457418A
- Authority
- CN
- China
- Prior art keywords
- air
- over
- fire
- flue gas
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
A method for reducing flue gas velocity deviation of a hearth outlet of a double-tangential boiler based on over-fire air comprises the following steps; calculating the modeling wind speeds of primary wind, secondary wind and over-fire wind when the flow field is in the self-modeling area; testing the speed deviation of the flue gas at the outlet of the hearth when the boiler does not throw over-fire air; testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions; testing the flue gas speed deviation when the boiler is fed with over-fire air and the over-fire air swings downwards; testing the flue gas speed deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely; and (4) combining the test result to obtain the rule of influence of the over-fire air on the speed deviation of the flue gas at the outlet of the hearth of the double-tangential boiler. The invention utilizes the cold-state modeling principle of the boiler, keeps the similarity of the cold-state airflow structure and the hot-state airflow distribution structure, slows down the residual rotation by adjusting the over-fire air, reduces the speed deviation of the flue gas, and more intuitively observes whether the airflow distribution of the outlet section of the boiler is good or not in the cold state, thereby laying a foundation for the hot-state operation and the combustion adjustment of a unit.
Description
Technical Field
The invention relates to the technical field of coal-fired power station boilers, in particular to a method for reducing flue gas velocity deviation of a hearth outlet of a double-tangential boiler based on over-fire air.
Background
Along with the continuous improvement of the national requirements on the economy and the environmental protection of an electric power system, the development of a high-parameter and large-capacity power station boiler is imperative, the existing large-capacity power station boiler mostly adopts a reverse double-tangential-circle combustion arrangement mode, the reverse double-tangential-circle combustion boiler reduces the thermal power of a single combustor by increasing the number of the combustors, so that the thermal load distribution is uniform, the pulverized coal firing range is short, the slagging prevention performance is good, but the reverse double-tangential-circle combustion mode enables the width of a hearth to be increased, a left flame center and a right flame center are formed in the combustion process, the speed deviation (namely the smoke quantity deviation) of smoke at the outlet of the hearth is large, the deviation of the main steam temperature and the reheat steam temperature at the left side and the right side is large, the superheater and the reheater are subjected to overtemperature.
The traditional method for reducing the flue gas side speed deviation of the existing coal-fired power station boiler comprises the following steps: the structure of the hearth is adjusted to enable the separating screen to deflect a certain angle or change the structure of a flame folding angle, and the method has the advantages of more investment in the early stage of boiler construction, unobvious effect and little application in engineering; the other method is to reduce the smoke velocity deviation of the boiler outlet by secondary air distribution, but the smoke velocity deviation is easy to cause unstable combustion in the boiler and even high-temperature corrosion caused by oxygen deficiency; aiming at the defects of the traditional adjusting method, residual rotation is slowed down based on over-fire air, the flue gas speed deviation is reduced, the original structure of the boiler is not changed, and the influence on stable combustion of the unit is small.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for reducing flue gas velocity deviation of a hearth outlet of a double-tangential boiler based on over-fire air, which utilizes a cold-state modeling principle of the boiler, keeps the similarity of a cold-state air flow structure and a hot-state air flow distribution structure, slows down residual rotation through adjustment of the over-fire air, reduces the flue gas velocity deviation, more intuitively observes whether the distribution of cross-section air flow of the boiler outlet is good or not in a cold state, and lays a foundation for thermal operation and combustion adjustment of a unit.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for reducing flue gas velocity deviation of a hearth outlet of a double-tangential boiler based on over-fire air comprises the following steps;
calculating the modeling wind speeds of primary wind, secondary wind and over-fire wind when the flow field is in the self-modeling area;
testing the speed deviation of the flue gas at the outlet of the hearth when the boiler does not throw over-fire air;
testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions;
testing the flue gas speed deviation when the boiler is fed with over-fire air and the over-fire air swings downwards;
testing the flue gas speed deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely;
and combining the wind speed calculation results of primary and secondary air and over-fire air when the flow field is in the self-modeling area, the flue gas speed deviation test result at the outlet of the hearth when the over-fire air is not thrown, the flue gas speed deviation test result when the over-fire air is thrown and the horizontal and vertical directions of the over-fire air are all set to zero positions, the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air swings downwards and the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air is cut backwards, and obtaining the influence rule of the over-fire air on the flue gas speed deviation at the outlet of the hearth.
The process of calculating the modeling wind speeds of the primary air, the secondary air and the over-fire air when the flow field is in the self-modeling area comprises the following steps:
and calculating the secondary wind speed under the cold-state modeling condition according to the condition that the Reynolds numbers of the secondary wind under the cold-state modeling condition and the thermal-state working condition are equal, and substituting into a momentum ratio equation to obtain the primary wind speed and the burnout wind speed under the modeling condition.
The calculation steps of the modeling wind speeds of the primary air, the secondary air and the over-fire air when the flow field is in the self-modeling area comprise: by using the self-moulding zone with the ratio of cold to hot primary and secondary wind power equal to each other, i.e.
Simplifying to obtain the relationship between the ratio of the primary air to the secondary air in cold state and hot state, i.e.
Then the Reynolds number is equal to that under the hot working condition according to the cold modeling of the secondary air, namely
Calculating the secondary wind speed under the cold-state modeling condition, and substituting the secondary wind speed into a momentum ratio equation to obtain the primary wind speed under the modeling condition; in the formula: m is1MThe mass flow of primary air under the cold state condition is kg/s; m is2MThe mass flow of secondary air under the cold condition is kg/s; m is1airThe mass flow of primary air under the thermal state working condition is kg/s; m is1coalThe mass flow of the coal dust carried by primary air under the thermal state working condition is kg/s; m is2airThe mass flow of secondary air under the thermal state working condition is kg/s; w is a1MThe primary air speed is m/s under the cold state condition; w is a2MThe secondary air speed is m/s under the cold state condition; w is a2airThe secondary air speed is m/s under the thermal state working condition; u is the mass concentration of the coal dust in the primary air pipe, kg/kg; k is a coefficient considering that the primary air flow rate is different from the pulverized coal flow rate; gamma ray2MThe kinematic viscosity of secondary air under cold condition, m2/s；γ2airIs the kinematic viscosity of secondary air under the thermal state condition, m2/s；T1airThe temperature is the primary air temperature under the thermal state working condition, K; t is2airThe secondary air temperature, K, L under the working condition of hot state2MThe cold secondary air door qualitative size, m, L2airIs the qualitative size of the thermal secondary air door, m.
The process for testing the speed deviation of the flue gas at the outlet of the hearth when the over-fire air is not thrown into the boiler comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at-100 +/-50 Pa, adjusting primary air and secondary air to cold-state modeling air speed, completely closing an over-fire air baffle, testing the air flow speeds of an upper layer, a middle layer and a lower layer at the section of an outlet of the hearth of the boiler, and analyzing the uniformity of air flow.
The process of testing the flue gas velocity deviation when the boiler is fed with the over-fire air and the over-fire air is uniformly arranged at the zero position in the horizontal and vertical directions comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at-100 +/-50 Pa, starting an over-fire air baffle, adjusting primary air, secondary air and over-fire air to a modeling air speed, testing the air flow velocities of an upper layer, a middle layer and a lower layer at the section of an outlet of the hearth of the boiler, and carrying out air flow uniformity analysis.
The process of testing the flue gas velocity deviation when the boiler is fed with the over-fire air and the over-fire air swings downwards comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at minus 100 +/-50 Pa, keeping the opening degrees of a primary air baffle and a secondary air baffle and an after-fire air baffle unchanged, keeping the air speed of the primary air baffle and the after-fire air baffle as the calculated cold-state modeling air speed, enabling the after-fire air baffle to swing downwards for a certain angle, testing the air speed of the upper layer, the middle layer and the lower layer of the outlet section of the boiler hearth, and performing air flow uniformity analysis.
The process of testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at minus 100 +/-50 Pa, keeping the opening degrees of a primary air baffle, a secondary air baffle and an over-fire air baffle unchanged, keeping the air speed of the primary air baffle, the secondary air baffle and the over-fire air baffle as the calculated cold-state modeling air speed, placing the over-fire air at a zero position in the vertical direction, reversely cutting the over-fire air at a certain angle in the horizontal direction, testing the air flow speeds of the upper layer, the middle layer and the lower layer at the.
The main steps of the boiler outlet flue gas velocity deviation test comprise:
(1) starting an induced draft fan, a blower and a primary fan;
(2) the negative pressure of the hearth is stabilized to-100 +/-50 Pa, and the primary air, the secondary air and the over-fire air are adjusted to the cold-state modeling air speed;
(3) controlling a hot-wire anemometer to test the air flow velocity at the section of the outlet of the boiler hearth through an extension rod, measuring the air flow velocity in an upper layer, a middle layer and a lower layer, and measuring each layer at an interval of 1 meter in the horizontal direction;
(4) checking the uniformity and size of airflow at the outlet of the furnace, calculating the deviation of the flue gas velocity at the outlet of the furnace, and reacting the deviation of the flue gas velocity at the outlet of the furnace with the velocity deviation ratio, i.e.
E is the speed deviation ratio; vRThe average speed on the right side of the horizontal flue is m/s; vLIs the average velocity, m/s, on the left side of the horizontal flue.
The speed deviation ratio reflects the deviation degree of the average speed fields on the left side and the right side of the horizontal flue, but cannot reflect the deviation condition of local speed, and cannot predict the specific region position of the overtemperature pipe explosion accident caused by local high-speed high-temperature airflow, so that the local maximum speed deviation condition is reflected by adopting a speed non-uniform coefficient, namely:
m is a velocity non-uniformity coefficient, ViThe average speed of each point of the horizontal flue is m/s; vmIs the average velocity of the horizontal flue, m/s.
The invention has the beneficial effects that:
the invention calculates the modeling wind speed of primary air, secondary air and over-fire air when a flow field is in a self-modeling area, tests the flue gas speed deviation at the outlet of a hearth when over-fire air is not thrown into a boiler, tests the flue gas speed deviation when over-fire air is thrown into the boiler and the horizontal vertical direction of the over-fire air is all set to zero, tests the flue gas speed deviation when over-fire air is thrown into the boiler and the over-fire air is laid downwards, tests the flue gas speed deviation when over-fire air is thrown into the boiler and the over-fire air is cut backwards, combines the calculated cold modeling wind speed of the primary air, the secondary air and the over-fire air, obtains the influence rule of the over-fire air on the flue gas speed deviation at the outlet of a double-section round boiler when the over-fire air is not thrown into the boiler, the over-fire air is thrown into the horizontal vertical direction of the over-fire air and the over-fire air is laid downwards, and the flue gas speed deviation test results when the over-, the method is a cold-state field test method for the boiler of the double-tangential circle coal-fired power station, the original structure of the boiler is not changed, a basis can be provided for reducing the smoke velocity deviation problem on the left side and the right side of the same type of unit over-fired air, and a foundation is laid for thermal-state combustion adjustment of the unit.
Drawings
FIG. 1 is a flowchart of an embodiment of a method for reducing flue gas velocity deviation at a hearth outlet of a double-tangential boiler according to over-fire air of the present invention.
FIG. 2 is a graph showing the velocity profile of the furnace exit when the over-fire air is not being fired by the boiler in a specific application example.
FIG. 3 is a graph showing the coefficient of non-uniformity of the furnace exit velocity when the over-fire air is not being fired by the boiler in a specific application example.
FIG. 4 is a diagram of the velocity distribution of the furnace exit when the boiler is operated with over-fire air and the over-fire air is uniformly zero in the horizontal and vertical directions in a specific application example.
FIG. 5 is a diagram illustrating a distribution of coefficients of non-uniform velocity at the exit of a furnace when the over-fire air is introduced into the boiler and the over-fire air is uniformly zero in the horizontal and vertical directions in a specific application example.
FIG. 6 is a diagram showing a velocity distribution of flue gas at the outlet of a furnace when a boiler is put into over-fire air and the over-fire air swings down by 30 degrees in a specific application example.
FIG. 7 is a diagram showing the coefficient distribution of the velocity unevenness at the outlet of the furnace when the boiler is put into the over-fire air and the over-fire air swings down by 30 degrees in a specific application example.
FIG. 8 is a diagram showing a velocity distribution of flue gas at a furnace outlet when the boiler is put into over-fire air and the over-fire air is cut back by 10 degrees in a specific application example.
FIG. 9 is a diagram of a coefficient distribution of furnace exit velocity non-uniformity when the boiler is fired with overfire air cut-back at 10 degrees in a specific application example.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of an embodiment of a method for reducing flue gas velocity deviation at a furnace outlet of a double-tangential boiler by using overfire air is shown; the method for reducing the flue gas deviation of the hearth outlet of the double-tangential boiler by using the over-fire air mainly comprises the following steps of:
step S101: calculating the modeling wind speeds of primary wind, secondary wind and over-fire wind when the flow field is in the self-modeling area;
the method for calculating the modeling wind speed of the primary air and the secondary air and the over-fire air in the cold self-modeling area mainly comprises the following steps:
(1) the cold-state and hot-state primary and secondary air flow ratio is equal when the self-molding zone is utilized, and the formula is simplified:
namely, it is
Because of (m)1air+m1coal)w1air＝(ρ1airD1airw1air+m1coal)w1air
Therefore, the first and second electrodes are formed on the substrate,
because the combustor geometry is similar under the cold-state modeling condition and the hot-state actual working condition,
therefore, the method comprises the following steps:
when the cold-state molding area is in the cold-state, the temperature of the primary air is equal to that of the secondary air,
therefore, the method comprises the following steps:
and
wherein: m is1MThe mass flow of primary air under the cold test condition is kg/s;
m2Mthe mass flow of secondary air under the cold test condition is kg/s;
m1airthe mass flow of primary air under the thermal state working condition is kg/s;
m1coalthe mass flow of the coal dust carried by primary air under the thermal state working condition is kg/s;
m2airthe mass flow of secondary air under the thermal state working condition is kg/s;
w1Mthe primary air speed is m/s under the cold test condition;
w2Mthe secondary air speed is m/s under the cold test condition;
w2airthe secondary air speed is m/s under the thermal state working condition;
k is a coefficient considering that the primary air flow rate is different from the pulverized coal flow rate, and is approximately 0.8;
u is the mass concentration of the coal dust in the primary air pipe, kg/kg;
D1airthe sectional area of the primary air nozzle in a hot state, m2；
D2airSectional area of secondary air nozzle m in thermal state2；
D1MThe sectional area of the primary air nozzle in a cold state, m2；
D2MThe sectional area of the secondary air nozzle m in cold state2；
ρ1airThe primary air density is kg/m under the thermal state working condition3；
ρ2airThe secondary air density is kg/m under the thermal state working condition3；
ρ1MThe primary air density is kg/m under the cold working condition3；
ρ2MThe secondary air density is kg/m under the cold working condition3；
T1airThe temperature is the primary air temperature under the thermal state working condition, K;
T2airthe temperature of secondary air is K under the thermal state working condition;
T1Mthe temperature of primary air under the cold working condition is K;
T2Mthe temperature of secondary air is K under the cold working condition;
the above formula is introduced into the formula of the ratio of cold air to hot air to the ratio of the first air to the second air to the hot air in the self-molding zone for simplification, and the relationship between the ratio of the first air to the second air in the cold state and the hot state can be obtained, namely
(2) The Reynolds number of the secondary air is equal according to the cold-state modeling and the hot-state working condition, i.e.
Calculating the secondary wind speed under cold modelling conditions, i.e.
And substituting the momentum ratio equation to obtain the primary wind speed under the modeling condition;
wherein: gamma ray2MIs the cold secondary air kinematic viscosity, m2/s；
γ2airIs the hot secondary air motion viscosity m2/s；
L2MThe qualitative size of the cold secondary air door is m;
L2airthe qualitative size of the thermal secondary air door is m;
(3) and the modeled wind speed of the over-fire air can be repeatedly calculated according to the calculation formula.
Step S102: testing the speed deviation of the flue gas at the outlet of the hearth when the boiler does not throw over-fire air;
the main steps of the furnace outlet flue gas velocity deviation test when the over-fire air is not thrown into the boiler comprise:
(1) starting an induced draft fan, a blower and a primary fan;
(2) the negative pressure of the hearth is stabilized to-100 +/-50 Pa, the primary air and the secondary air are adjusted to the calculated cold-state modeling air speed, the over-fire air baffle is closed, and over-fire air is not fed;
(3) controlling a hot-wire anemometer to test the air flow velocity at the section of the outlet of the boiler hearth through an extension rod, measuring the air flow velocity in an upper layer, a middle layer and a lower layer, and measuring each layer at an interval of 1 meter in the horizontal direction;
(4) checking the uniformity and size of airflow at the outlet of the furnace according to the speed deviation ratio
The left and right distribution uniformity of the gas flow at the reaction outlet is obtained, and E is the speed deviation ratio; vRThe average speed on the right side of the horizontal flue is m/s; vLIs the average velocity, m/s, on the left side of the horizontal flue. The velocity non-uniformity coefficient is adopted to reflect the local maximum velocity deviation condition, namely:
m is a velocity non-uniformity coefficient, ViThe average speed of each point of the horizontal flue is m/s; vmIs the average velocity of the horizontal flue, m/s.
Step S103: testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions;
the method comprises the steps that the speed deviation of flue gas at the outlet of a hearth when over-fire air is not fed into a boiler is tested, when the over-fire air is fed into the boiler and the horizontal and vertical directions of the over-fire air are all set to zero positions, an over-fire air baffle is directly opened, the wind speeds of primary air, secondary air and the over-fire air are adjusted to be the cold-state modeling wind speeds, the hot-wire anemometer is controlled by an extension rod to test the airflow speeds at the upper layer, the middle layer and the lower layer of the outlet section of the hearth of the boiler, and the speed deviation ratio E and the speed unevenness coefficient;
step S104: testing the flue gas speed deviation when the boiler is fed with over-fire air and the over-fire air swings downwards;
the overfire air can generate disturbance mixing action with the smoke which rotates upwards when swinging downwards, so that the tangential force of the smoke can be reduced, and the flowing uniformity of the smoke at the outlet of the hearth can be increased. The method comprises the steps that flue gas velocity deviation is tested when overfire air is input into a boiler and the horizontal vertical direction of the overfire air is all set to be zero, when the flue gas deviation is tested when the overfire air is input into the boiler and the overfire air swings downwards, the opening degrees of a primary air baffle and a secondary air baffle are kept unchanged, the wind speed is kept to be the calculated cold-state modeling wind speed, the overfire air baffle swings downwards for a certain angle, the air velocity of the upper layer, the middle layer and the lower layer of the outlet section of a boiler furnace is tested continuously through a hot wire anemometer, and the velocity deviation ratio E and the velocity non-uniformity coefficient M are calculated and analyzed;
step S105: testing the flue gas speed deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely;
the air-fuel mixture can collide with ascending air flow when the over-fire air is cut reversely, so that the original air flow direction is disturbed, and a certain racemization effect is achieved. The method comprises the steps that as the flue gas velocity deviation when the boiler is fed with over-fire air and the over-fire air swings downwards is tested, when the flue gas velocity deviation when the boiler is fed with the over-fire air and the over-fire air is cut reversely, the opening degrees of a primary air baffle, a secondary air baffle and the over-fire air baffle are unchanged, the air velocity is kept to be the calculated cold-state modeling air velocity, the over-fire air is placed at a zero position in the vertical direction and cut reversely at a certain angle in the horizontal direction, after stabilization, the air velocities at the upper layer, the middle layer and the lower layer of the outlet section of the boiler hearth are continuously tested through a hot wire anemometer, and the velocity deviation ratio E and the;
step S106: and combining the wind speed calculation results of primary and secondary air and over-fire air when the flow field is in the self-modeling area, the flue gas speed deviation test result at the outlet of the boiler when over-fire air is not thrown, the flue gas speed deviation test result when over-fire air is thrown and the horizontal and vertical directions of the over-fire air are all set to zero positions, the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air swings downwards and the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air is cut backwards, and obtaining the influence rule of the over-fire air on the flue gas speed deviation at the outlet of the hearth of the.
The application of the present invention is illustrated by a specific example.
In the specific embodiment, the test object is a 2 × 1000MW unit boiler of national Electricity Zhenengdong Power generation Co., Ltd., of model HG-3239/29.3-YM5, which belongs to an ultra-supercritical boiler and adopts a medium-speed mill cold primary fan, a positive pressure direct-blowing type powder making system, a negative pressure hearth, balanced ventilation powder making, and low NO powder makingXA main burner and a high-level over-fire air staged combustion technology, and a reverse double-four-corner tangential combustion mode. Each furnace is provided with 6 medium-speed mills which are uniformly distributed on the left side of a hearth, and 5 mills run for 1 standby under the working condition of Boiler maximum continuous evaporation capacity; the burners are arranged by adopting front and rear walls, the total number of the burners is 8, the front and rear walls are respectively provided with 4 burners, and reverse double-four-corner tangent circles are formed inside a hearth. The primary and secondary air and main parameters of the furnace are shown in table 1, and the coal quality analysis is shown in table 2.
TABLE 1 Primary and secondary air and furnace Main parameters under BMCR operating conditions
TABLE 2 analysis of characteristics of coal and ash
The main burner adopts a traditional large air box structure, the large air box is divided into a plurality of air boxes by partition plates, burner nozzles with different numbers are arranged at the outlets of the air boxes, and the main burner is divided into two groups: the upper pulverized coal burner is provided with 9 air chambers and 3 pulverized coal chambers; the lower part pulverized coal burner has 7 air wind chambers and 3 pulverized coal wind chambers. The over-fire air burner is divided into two groups of 6 air chambers. Two nozzles are arranged in each over-fire air chamber, and each nozzle of over-fire air can respectively do horizontal swinging of +/-10 degrees and vertical swinging of +/-30 degrees. The boiler over-fire air is taken from a secondary air box, and under the BMCR working condition, the over-fire air speed is consistent with the secondary air speed and is 50 m/s.
The boiler flue gas flows through a separating screen superheater, a final reheater and a tail steering chamber of an upper hearth in sequence, and then enters a front tail flue shaft and a rear tail flue shaft which are divided by a separating wall, the flue gas flows through a low-temperature reheater and a front-stage economizer in the front shaft, the other part of the flue gas flows through the low-temperature superheater and a rear-stage economizer, and flue gas distribution baffles are arranged at outlets of the front and rear separating shafts to adjust the amount of the flue gas flowing through the front and rear separating shafts, so that the purpose of adjusting the steam temperature of the reheater is achieved. The flue gas flows through the distribution baffle plate and then is discharged to the electric dust collector and the induced draft fan through the connecting flue and the rotary air preheater.
Purpose and meaning:
the over-fire air reduces the speed deviation of the flue gas at the outlet of the hearth of the double-tangential boiler mainly by utilizing the cold-state modeling principle of the boiler, keeps the similarity of a cold-state air flow structure and a hot-state air flow distribution structure, slows down the residual rotation through the adjustment of the over-fire air, reduces the speed deviation of the flue gas, and more visually observes whether the distribution of the air flow at the outlet section of the boiler is good or not at the cold state, thereby laying a foundation for the hot-state operation and combustion adjustment of a unit.
The main items of reducing the flue gas speed deviation of the hearth outlet of the double-tangential boiler by using the over-fire air are as follows:
(1) calculating the wind speeds of primary wind, secondary wind and over-fire wind when the flow field is in the self-modeling area;
(2) testing the speed deviation of the flue gas at the outlet of the hearth when the boiler does not throw over-fire air;
(3) testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions;
(4) testing the flue gas speed deviation when the boiler is fed with over-fire air and the over-fire air swings downwards;
(5) testing the flue gas speed deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely;
(6) and analyzing and comparing the test results to obtain the rule of influence of the over-fire air on the speed deviation of the flue gas at the outlet of the double-tangential boiler.
The data processing method comprises the following steps:
the speed deviation of the flue gas at the outlet of the boiler furnace is reacted by using a speed deviation ratio,
namely:
wherein: e is the speed deviation ratio;
VRthe average speed on the right side of the horizontal flue is m/s;
VLis the average velocity, m/s, on the left side of the horizontal flue.
The speed deviation ratio reflects the deviation degree of the average speed fields at the left side and the right side of the horizontal flue, but cannot reflect the local speed deviation condition, cannot predict the specific area part of the overtemperature pipe explosion accident caused by local high-speed high-temperature airflow, adopts a speed non-uniform coefficient to reflect the local maximum speed deviation condition,
namely:
wherein: m is a velocity non-uniformity coefficient;
Vithe average speed of each point of the horizontal flue is m/s;
Vmis the average velocity of the horizontal flue, m/s.
Analysis and discussion of results:
(1) modeling wind speed calculation of primary air, secondary air and over-fire air when flow field is in self-modeling area
During a cold-state modeling test, the wind speeds of primary air, secondary air and over-fire air under a cold-state condition, namely modeling wind speed, can be calculated according to the momentum ratio, then the measurement and judgment of the airflow structure are carried out according to the modeling wind speed, and the airflow structure is compared and analyzed with the airflow structure under a hot-state working condition, so that a basis is provided for guiding the actual operation of the boiler. The momentum of the primary air is only one part of the primary air in the cold state, and in the actual operation process, the momentum of the primary air consists of two parts of the momentum of the primary air and the momentum of the pulverized coal, so the ratio of the momentum of the primary air to the momentum of the secondary air is as follows:
namely, it is
Wherein: m is1MThe mass flow of primary air under the cold state condition is kg/s;
m2Mthe mass flow of secondary air under the cold condition is kg/s;
m1airthe mass flow of primary air under the thermal state working condition is kg/s;
m1coalthe mass flow of the coal dust carried by primary air under the thermal state working condition is kg/s;
m2airthe mass flow of secondary air under the thermal state working condition is kg/s;
w1Mthe primary air speed is m/s under the cold state condition;
w2Mthe secondary air speed is m/s under the cold state condition;
w2airthe secondary air speed is m/s under the thermal state working condition;
the primary wind momentum under the intermediate thermal state working condition can be simplified as follows:
(m1air+m1coal)w1air＝(ρ1airD1airw1air+m1coal)w1air
wherein: rho1airIs the primary air density under BMCR working condition, kg/m3；
D1airIs the sectional area of the primary air nozzle, m2；
k is a coefficient considering that the primary air flow rate is different from the pulverized coal flow rate, and is approximately 0.8;
u is the mass concentration of the coal dust in the primary air pipe, kg/kg;
according to the table 1, the calculated ventilation of a single coal mill of the boiler is 145.19t/h, the sealing air volume of the single coal mill is 7.245t/h, the output of the coal mill is 94.89t/h, and then the mass concentration of the coal powder in the primary air pipe is as follows:
because the combustor geometry is similar under cold modeling conditions and hot operating conditions, so there are:
during cold-state modeling test, the temperature of primary air and secondary air is equal, and is the actual ambient temperature, so have:
and
D1Mthe sectional area of the primary air nozzle in a cold state, m2；D2MThe sectional area of the secondary air nozzle m in cold state2；ρ1airThe primary air density is kg/m under the thermal state working condition3；ρ2airThe secondary air density is kg/m under the thermal state working condition3；ρ1MThe primary air density is kg/m under the cold working condition3；ρ2MThe secondary air density is kg/m under the cold working condition3；T1airThe temperature is the primary air temperature under the thermal state working condition, K; t is2airThe temperature of secondary air is K under the thermal state working condition; t is1MThe temperature of primary air under the cold working condition is K; t is2MThe secondary air temperature is K under the cold working condition.
The above formula is simplified as follows:
according to cold state and hot stateThe Reynolds numbers of the secondary air being equal under the working conditions, i.e.
Calculating the secondary wind speed under cold modelling conditions, i.e.
And the primary wind speed, gamma, under the condition of modeling is calculated by substituting the momentum phase ratio equation2MIs the cold secondary air kinematic viscosity, m2/s；γ2airIs the hot secondary air motion viscosity m2/s；L2MThe cold secondary air door qualitative size, m, L2airIs the qualitative size of the thermal secondary air door, m.
According to the data in the table 1, the primary air-cooled modeling air speed is 19.98m/s, the secondary air-cooled modeling air speed is 22.74m/s, and the over-fired air-cooled modeling air speed is 22.74 m/s.
(2) Testing of furnace outlet flue gas velocity deviation when no over-fire air is fed into boiler
Starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at-110 Pa, adjusting primary air and secondary air to the calculated cold-state modeling air speed, completely closing an over-fire air baffle, measuring the air flow speed of an upper layer, a middle layer and a lower layer at the position of the section of the outlet of the boiler hearth by a hot wire anemometer, measuring the air flow speed at intervals of 1 meter in the horizontal direction of each layer, and then testing according to the speed deviation ratio
And coefficient of velocity non-uniformity
Checking the uniformity of airflow at the outlet of the furnace chamber, wherein V isRThe average speed on the right side of the horizontal flue is m/s; vLThe average speed on the left side of the horizontal flue is m/s; viThe average speed of each point of the horizontal flue is m/s; vmIs the average velocity of the horizontal flue,m/s, the results are shown in FIGS. 2 and 3.
(3) Flue gas velocity deviation test when boiler is put into over-fire air and the over-fire air is uniformly set to zero position in horizontal and vertical directions
The speed deviation of flue gas at the outlet of the furnace when over-fire air is not fed into the boiler is tested, the next step of testing can be directly carried out without stopping a fan, when over-fire air is fed into the boiler and the horizontal and vertical directions of the over-fire air are all set to zero positions, an over-fire air baffle plate is directly opened, primary air, secondary air and the over-fire air are adjusted to be the cold-state modeling air speed, the differential pressure of the secondary air box is 5Kpa at the moment, the total air volume is 2754t/h, the air speeds at the upper layer, the middle layer and the lower layer of the outlet section of the boiler furnace are tested through a hot wire anemometer, the horizontal direction of each layer is tested at an interval of 1 meter, the speed deviation ratio E and the speed non-uniformity coefficient.
(4) Flue gas velocity deviation test when boiler is put into over-fire air and the over-fire air swings downwards by 30 degrees
As the flue gas velocity deviation is tested when the over-fire air is input into the boiler and the horizontal vertical direction of the over-fire air is all set to the zero position, when the flue gas deviation of the hearth outlet is tested when the over-fire air is input into the boiler and the over-fire air swings down by 30 degrees, the opening degrees of the primary air baffle and the over-fire air baffle are unchanged, the wind speed is kept to be the modeling wind speed, the over-fire air baffle swings down by 30 degrees, the air velocity at the upper layer, the middle layer and the lower layer of the outlet section of the boiler hearth is tested through a hot wire anemometer, the horizontal direction of each layer is tested at an interval of 1 meter, and the velocity deviation ratio E and the velocity non-uniformity coefficient M are calculated and analyzed, and.
(5) Flue gas velocity deviation test when boiler is put into over-fire air and the over-fire air is reversely cut by 10 degrees
The air-fuel mixture can collide with ascending air flow when the over-fire air is cut reversely, so that the original air flow direction is disturbed, and a certain racemization effect is achieved. The method is characterized in that the flue gas velocity deviation is tested when the boiler is fed with over-fire air and the over-fire air swings downwards, when the flue gas velocity deviation is tested when the boiler is fed with the over-fire air and the over-fire air is reversely cut by 10 degrees, the opening degrees of a primary air baffle and a secondary air baffle are unchanged, the air velocity is kept as the calculated cold-state modeling air velocity, the over-fire air baffle is swung upwards and downwards to a zero position and reversely cut by 10 degrees from left to right, after the over-fire air baffle is stabilized, the air velocities at the upper layer, the middle layer and the lower layer of the outlet section of the boiler furnace are tested by a hot-wire anemometer, the horizontal direction of each layer is separated by 1 meter, the velocity deviation ratio E and the velocity non-uniformity coefficient M are.
(6) And analyzing the influence rule of the over-fire air on the speed deviation of the flue gas at the outlet of the hearth of the double-tangential boiler by combining the test result.
The speed ratio of the flue gas at the hearth outlet when the over-fire air is not fed into the boiler is 1.05, the speed deviation ratio when the over-fire air is fed and the over-fire air is all set to be at a zero position in the horizontal and vertical directions is 1.06, the speed deviation ratio when the over-fire air swings downwards by 30 degrees is 1.04, and the speed deviation ratio when the over-fire air is reversely cut by 10 degrees is 1.02 and the minimum, which shows that the flue gas speed deviation at the hearth outlet of the double-tangential boiler can be well reduced when the over-fire air is reversely cut.
FIGS. 2, 4, 6, 8 are respectively a smoke velocity distribution diagram of an outlet section of a boiler furnace when no over-fire air is thrown, over-fire air is thrown and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions, the over-fire air is swung downwards by 30 degrees and the over-fire air is reversely cut by 10 degrees, the abscissa is the relative width of the furnace, and the ordinate is the velocity of each measured point.
Horizontal direction velocity distribution is comparatively even on the whole, but furnace left side is greater than the middle part with right side speed, and right side and left side air current distribution are the symmetric distribution, and the wind speed shows "M" type distribution on the whole, and the wind speed deviation is less. The airflow at the left side and the right side of the furnace is directed to the furnace, the tangential speed of the airflow is the same as the flow direction of the flue gas at the outlet of the hearth, the airflow enters the screen area and rises a short distance to enter the outlet of the hearth, namely, the short circuit phenomenon of the airflow occurs, the resistance in the flowing process of the flue gas is small, so that the speed of the flue gas close to the left wall and the right wall of the furnace is obviously higher than that of the middle area, and the partition screen is not arranged at the position of the left wall and the right wall of the furnace close to the furnace wall, so that the speed of the area close to the furnace wall is higher, and in the middle area of the furnace, the direction of the airflow is opposite to the flowing direction of the flue gas at.
FIGS. 3, 5, 7, and 9 show the non-thrown overfire air, the non-uniform coefficient of the furnace exit velocity when the overfire air is thrown and the horizontal and vertical directions of the overfire air are all set to zero, the non-uniform coefficient of the furnace exit velocity when the overfire air is thrown to 30 degrees and the reverse cutting of the overfire air is 10 degrees, the maximum non-uniform coefficient of the furnace exit velocity when the overfire air is not thrown to 1.32, the maximum non-uniform coefficient when the overfire air is thrown and the horizontal and vertical directions are all set to zero is 1.38, the maximum non-uniform coefficient when the overfire air is thrown to 30 degrees is 1.26, the maximum non-uniform coefficient when the overfire air is reverse cutting to 10 degrees is 1.20, which shows that the jet flow direction when the overfire air is thrown and the horizontal and vertical directions of the overfire air are all set to zero is the same as the direction of a secondary air, at this time, the overfire air can only intensify the jet flow deflection and cannot play a role of racemization, can collide with the ascending air when the overfire, the deviation is most obvious for reducing the smoke speed.
In the above embodiments, for the sake of brevity, all possible combinations of the features in the above embodiments are not described, and it should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these embodiments are within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for reducing flue gas velocity deviation of a hearth outlet of a double-tangential boiler based on over-fire air is characterized by comprising the following steps;
calculating the modeling wind speeds of primary wind, secondary wind and over-fire wind when the flow field is in the self-modeling area;
testing the speed deviation of the flue gas at the outlet of the hearth when the boiler does not throw over-fire air;
testing the flue gas velocity deviation when the over-fire air is input into the boiler and the over-fire air is uniformly arranged at a zero position in the horizontal and vertical directions;
testing the flue gas speed deviation when the boiler is fed with over-fire air and the over-fire air swings downwards;
testing the flue gas speed deviation when the over-fire air is input into the boiler and the over-fire air is cut reversely;
and combining the wind speed calculation results of primary and secondary air and over-fire air when the flow field is in the self-modeling area, the flue gas speed deviation test result at the outlet of the hearth when the over-fire air is not thrown, the flue gas speed deviation test result when the over-fire air is thrown and the horizontal and vertical directions of the over-fire air are all set to zero positions, the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air swings downwards and the flue gas speed deviation test result when the over-fire air is thrown and the over-fire air is cut backwards, and obtaining the influence rule of the over-fire air on the flue gas speed deviation at the outlet of the hearth.
2. The method for reducing the flue gas velocity deviation at the outlet of the double-tangential boiler furnace based on the over-fire air as claimed in claim 1, wherein the process of calculating the modeling wind speeds of the primary air, the secondary air and the over-fire air when the flow field is in the self-modeling area comprises the following steps:
and calculating the secondary wind speed under the cold-state modeling condition according to the condition that the Reynolds numbers of the secondary wind under the cold-state modeling condition and the thermal-state working condition are equal, and substituting into a momentum ratio equation to obtain the primary wind speed and the burnout wind speed under the modeling condition.
3. The method for reducing the flue gas velocity deviation at the outlet of the double-tangential boiler furnace based on the over-fire air as claimed in claim 1, wherein the calculating steps of the first air, the secondary air and the over-fire air modeling wind speed when the flow field is in the self-modeling area comprise: by using the self-moulding zone with the ratio of cold to hot primary and secondary wind power equal to each other, i.e.
Simplifying to obtain the relationship between the ratio of the primary air to the secondary air in cold state and hot state, i.e.
Then the Reynolds number is equal to that under the hot working condition according to the cold modeling of the secondary air, namely
Calculating the secondary wind speed under the cold-state modeling condition, and substituting the secondary wind speed into a momentum ratio equation to obtain the primary wind speed under the modeling condition; in the formula: m is1MThe mass flow of primary air under the cold state condition is kg/s; m is2MThe mass flow of secondary air under the cold condition is kg/s; m is1airThe mass flow of primary air under the thermal state working condition is kg/s; m is1coalThe mass flow of the coal dust carried by primary air under the thermal state working condition is kg/s; m is2airThe mass flow of secondary air under the thermal state working condition is kg/s; w is a1MThe primary air speed is m/s under the cold state condition; w is a2MThe secondary air speed is m/s under the cold state condition; w is a2airThe secondary air speed is m/s under the thermal state working condition; u is the mass concentration of the coal powder in the primary air pipe, kg/kg, k is a coefficient considering the difference between the primary air flow velocity and the coal powder flow velocity, and gamma is2MThe kinematic viscosity of secondary air under cold condition, m2/s，γ2airIs the kinematic viscosity of secondary air under the thermal state condition, m2/s。
4. The method for reducing the speed deviation of the flue gas at the outlet of the hearth of the double-tangential boiler based on the over-fire air as claimed in claim 1, wherein the process of testing the speed deviation of the flue gas at the outlet of the hearth when the over-fire air is not fed into the boiler comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at-100 +/-50 Pa, adjusting primary air and secondary air to cold-state modeling air speed, completely closing an over-fire air baffle, testing the air flow speeds of an upper layer, a middle layer and a lower layer at the section of an outlet of the hearth of the boiler, and analyzing the uniformity of air flow.
5. The method for reducing the flue gas velocity deviation at the outlet of the hearth of the double-tangential boiler based on the over-fire air as claimed in claim 1, wherein the process of testing the flue gas velocity deviation when the boiler is put into the over-fire air and the over-fire air is horizontally and vertically arranged at a zero position comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at-100 +/-50 Pa, starting an over-fire air baffle, adjusting primary air, secondary air and over-fire air to a modeling air speed, testing the air flow velocities of an upper layer, a middle layer and a lower layer at the section of an outlet of the hearth of the boiler, and carrying out air flow uniformity analysis.
6. The method for reducing the flue gas velocity deviation at the outlet of the hearth of the double-tangential boiler based on the over-fire air as claimed in claim 1, wherein the process of testing the flue gas velocity deviation when the boiler is put into the over-fire air and the over-fire air swings down comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at minus 100 +/-50 Pa, keeping the opening degrees of a primary air baffle and a secondary air baffle and an after-fire air baffle unchanged, keeping the air speed of the primary air baffle and the after-fire air baffle as the calculated cold-state modeling air speed, enabling the after-fire air baffle to swing downwards for a certain angle, testing the air speed of the upper layer, the middle layer and the lower layer of the outlet section of the boiler hearth, and performing air flow uniformity analysis.
7. The method for reducing the flue gas velocity deviation at the outlet of the hearth of the double-tangential boiler based on the over-fire air as claimed in claim 1, wherein the process of testing the flue gas velocity deviation when the boiler is put into the over-fire air and the over-fire air is cut reversely comprises the following steps:
starting an induced draft fan, a blower and a primary fan, maintaining the negative pressure of a hearth at minus 100 +/-50 Pa, keeping the opening degrees of a primary air baffle, a secondary air baffle and an over-fire air baffle unchanged, keeping the air speed of the primary air baffle, the secondary air baffle and the over-fire air baffle as the calculated cold-state modeling air speed, placing the over-fire air at a zero position in the vertical direction, reversely cutting the over-fire air at a certain angle in the horizontal direction, testing the air flow speeds of the upper layer, the middle layer and the lower layer at the.
8. The method for reducing the speed deviation of the flue gas at the outlet of the hearth of the double-tangential boiler based on the over-fire air as claimed in claim 1, wherein the main steps of testing the speed deviation of the flue gas at the outlet of the boiler comprise:
(1) starting an induced draft fan, a blower and a primary fan;
(2) the negative pressure of the hearth is stabilized to-100 +/-50 Pa, and the primary air, the secondary air and the over-fire air are adjusted to the cold-state modeling air speed;
(3) controlling a hot-wire anemometer to test the air flow velocity at the section of the outlet of the boiler hearth through an extension rod, measuring the air flow velocity in an upper layer, a middle layer and a lower layer, and measuring each layer at an interval of 1 meter in the horizontal direction;
(4) checking the uniformity and size of airflow at the outlet of the furnace, calculating the deviation of the flue gas velocity at the outlet of the furnace, and reacting the deviation of the flue gas velocity at the outlet of the furnace with the velocity deviation ratio, i.e.
E is the speed deviation ratio; vRThe average speed on the right side of the horizontal flue is m/s; vLIs the average velocity, m/s, on the left side of the horizontal flue.
The speed deviation ratio reflects the deviation degree of the average speed fields on the left side and the right side of the horizontal flue, but cannot reflect the deviation condition of local speed, and cannot predict the specific region position of the overtemperature pipe explosion accident caused by local high-speed high-temperature airflow, so that the local maximum speed deviation condition is reflected by adopting a speed non-uniform coefficient, namely:
m is a velocity non-uniformity coefficient, ViThe average speed of each point of the horizontal flue is m/s; vmIs the average velocity of the horizontal flue, m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010274658.7A CN111457418A (en) | 2020-04-09 | 2020-04-09 | Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010274658.7A CN111457418A (en) | 2020-04-09 | 2020-04-09 | Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111457418A true CN111457418A (en) | 2020-07-28 |
Family
ID=71685278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010274658.7A Pending CN111457418A (en) | 2020-04-09 | 2020-04-09 | Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111457418A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383873A (en) * | 2021-11-26 | 2022-04-22 | 东方电气集团东方锅炉股份有限公司 | Horizontal cold state swing test method for nozzles of four-corner combustor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5727480A (en) * | 1996-04-17 | 1998-03-17 | Foster Wheeler International, Inc. | Over-fire air control system for a pulverized solid fuel furnace |
| CN103968371A (en) * | 2014-02-07 | 2014-08-06 | 广东电网公司电力科学研究院 | Electric combustion boiler and SOFA (separated over fire air) adjustment method based on numerical simulation technique |
| CN104197314A (en) * | 2014-08-05 | 2014-12-10 | 广东省粤电集团有限公司珠海发电厂 | Four corner tangential boiler combustion control method |
| CN104595889A (en) * | 2015-01-21 | 2015-05-06 | 西安西热锅炉环保工程有限公司 | System and method for eliminating operation oxygen deviation at two sides of tangential firing boiler |
| CN105042629A (en) * | 2015-07-10 | 2015-11-11 | 广东电网有限责任公司电力科学研究院 | Startup commissioning method for ultra-supercritical octagonal tangent circle coal-fired boiler |
| CN105203290A (en) * | 2015-09-22 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Ultra-supercritical octagonal circle cutting coal-fired power plant boiler cold-state dynamic field test method |
| CN109060390A (en) * | 2018-06-26 | 2018-12-21 | 珠海市蓝海工业技术有限公司 | A kind of coal-fired plant boiler aerodynamic field experimental method based on inspection platform |
| CN110274223A (en) * | 2019-06-28 | 2019-09-24 | 江苏方天电力技术有限公司 | A kind of removing method of double reheat power generation sets reheat steam temperature deviation |
-
2020
- 2020-04-09 CN CN202010274658.7A patent/CN111457418A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5727480A (en) * | 1996-04-17 | 1998-03-17 | Foster Wheeler International, Inc. | Over-fire air control system for a pulverized solid fuel furnace |
| CN103968371A (en) * | 2014-02-07 | 2014-08-06 | 广东电网公司电力科学研究院 | Electric combustion boiler and SOFA (separated over fire air) adjustment method based on numerical simulation technique |
| CN104197314A (en) * | 2014-08-05 | 2014-12-10 | 广东省粤电集团有限公司珠海发电厂 | Four corner tangential boiler combustion control method |
| CN104595889A (en) * | 2015-01-21 | 2015-05-06 | 西安西热锅炉环保工程有限公司 | System and method for eliminating operation oxygen deviation at two sides of tangential firing boiler |
| CN105042629A (en) * | 2015-07-10 | 2015-11-11 | 广东电网有限责任公司电力科学研究院 | Startup commissioning method for ultra-supercritical octagonal tangent circle coal-fired boiler |
| CN105203290A (en) * | 2015-09-22 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Ultra-supercritical octagonal circle cutting coal-fired power plant boiler cold-state dynamic field test method |
| CN109060390A (en) * | 2018-06-26 | 2018-12-21 | 珠海市蓝海工业技术有限公司 | A kind of coal-fired plant boiler aerodynamic field experimental method based on inspection platform |
| CN110274223A (en) * | 2019-06-28 | 2019-09-24 | 江苏方天电力技术有限公司 | A kind of removing method of double reheat power generation sets reheat steam temperature deviation |
Non-Patent Citations (1)
| Title |
|---|
| 巩时尚: "双切圆锅炉燃尽风减轻烟气速度偏差试验研究", 《电力勘测设计》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383873A (en) * | 2021-11-26 | 2022-04-22 | 东方电气集团东方锅炉股份有限公司 | Horizontal cold state swing test method for nozzles of four-corner combustor |
| CN114383873B (en) * | 2021-11-26 | 2023-04-28 | 东方电气集团东方锅炉股份有限公司 | Horizontal cold swing test method for nozzle of tetragonal burner |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103148506B (en) | Secondary air distribution method and system for pulverized coal boiler with swirling combustion of front-back hedging | |
| CN105203290B (en) | Ultra supercritical anise circle of contact coal-fired power station boiler cool power field test method | |
| CN105042629A (en) | Startup commissioning method for ultra-supercritical octagonal tangent circle coal-fired boiler | |
| CN112524637B (en) | Boiler combustion optimization method and system based on air-powder and CO online monitoring | |
| Wang et al. | Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air | |
| CN103148508B (en) | Secondary air distribution method and system for pulverized coal boiler with swirling combustion of front-back hedging | |
| Wang et al. | Numerical simulation and cold experimental research of a low-NOx combustion technology for pulverized low-volatile coal | |
| KR20140003558A (en) | Solid fuel burner and combustion device using same | |
| WO2023246029A1 (en) | Online precise measurement-based method for preventing and controlling corrosion of water-cooled wall | |
| WO2017133316A1 (en) | Method, device, and automatic control system for determining air intake amount for opposed firing | |
| CN105841141A (en) | Operation evaluation method for additional inlet air of tangential firing tilting nozzles | |
| CN111289278B (en) | Method for evaluating effect of hedging coal-fired boiler after secondary air box flow field transformation | |
| CN111457418A (en) | Method for reducing flue gas velocity deviation of hearth outlet of double-tangential boiler based on over-fire air | |
| CN102980740B (en) | Turbulent burner cold air dynamic field measuring method and exclusive surveying instrument | |
| CN111664443A (en) | Cold state research method for adjusting smoke temperature deviation of two sides of tetragonal tangential boiler | |
| CN110805889A (en) | Combustion adjusting method for reducing left-right deviation of boiler hearth outlet under AGC operation | |
| Li et al. | Influence of staged-air flow on flow characteristics in a scale model of a down-fired utility boiler with swirl burners: An experimental study | |
| CN116776770B (en) | CFD numerical simulation coupling BP neural network based method for relieving high-temperature corrosion of boiler | |
| CN110513717B (en) | Diagnosis and prevention method for ash blockage of tail flue gas channel of double-tangential-circle combustion boiler | |
| CN111550820B (en) | Boiler over-fire air adjusting method based on momentum moment | |
| Li et al. | Effects of the gas/particle flow and combustion characteristics on water-wall temperature and energy conversion in a supercritical down-fired boiler at different secondary-air distributions | |
| CN110715288A (en) | Wall-attached air system for coal-fired boiler with four tangential corners | |
| WO2022188375A1 (en) | Pulverized coal boiler integrated comprehensive adjustment method based on water-cooled wall high-temperature corrosion prevention and control | |
| CN113137625A (en) | Method for relieving high-temperature corrosion of cold ash bucket of tangential firing boiler | |
| CN202118875U (en) | Layout structure of coke oven gas combustion device used in power station boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200728 |