CN108319790B - Novel method for correcting heat load parameters of boiler furnace in plateau area - Google Patents

Novel method for correcting heat load parameters of boiler furnace in plateau area Download PDF

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CN108319790B
CN108319790B CN201810129211.3A CN201810129211A CN108319790B CN 108319790 B CN108319790 B CN 108319790B CN 201810129211 A CN201810129211 A CN 201810129211A CN 108319790 B CN108319790 B CN 108319790B
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刘家利
姚伟
屠竞毅
王志超
王桂芳
杨忠灿
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Xian Thermal Power Research Institute Co Ltd
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Abstract

The invention discloses a new method for correcting a boiler furnace heat load parameter in a plateau area, which comprises the following steps of 1, mastering basic coal quality parameters and combustion performance parameters of designed coal; 2. selecting boiler furnace heat load parameters in plain areas according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and specifically comprising boiler section heat load q in plain areasFFlat zone boiler burner zone wall surface heat load qBDistance h between center of uppermost layer burner and bottom of screen of boiler in plain area1And the volumetric heat load q of the boiler furnace in peace and plain areasv(ii) a Calculating the heat load parameters of the boiler furnace in the plateau area according to the combustion performance of the designed coal, wherein the calculation specifically comprises the heat load q of the boiler section in the plateau areaFGHeat load q of the wall of the boiler burner zone in the plateau zoneBGDistance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1GAnd the volumetric heat load q of the boiler furnace in the plateau areavG(ii) a The method of the invention is more beneficial to the stable combustion and the burnout of the pulverized coal fired boiler in the plateau area.

Description

Novel method for correcting heat load parameters of boiler furnace in plateau area
Technical Field
The invention relates to the technical field of selection of boiler furnace heat load parameters in plateau areas, in particular to a new method for correcting the boiler furnace heat load parameters in the plateau areas, which is suitable for selecting the boiler furnace heat load parameters of the tangential firing boilers at four corners in the plateau areas.
Background
The combustion performances of ignition, burnout, slagging and the like of the coal sample are the basis and the foundation of boiler design. Under plateau conditions, due to the fact that the oxygen partial pressure is reduced, the ignition and burnout performance of the coal sample is poor, and the slagging performance is not changed obviously, therefore, some measures for increasing stable combustion and burnout should be properly considered in the design of the boiler in plateau areas. In addition, under the plateau condition, the volume of the air and the flue gas entering the boiler is increased, and if the boiler in the plateau area is unreasonably designed, the problems that the boiler extinguishes fire, the carbon content of fly ash and slag is high, the exhaust gas temperature is high, the plant power consumption rate is high, and the like, which affect the safety and the economic operation of the boiler are easily caused.
In order to solve the problems, Yuan et al provides a correction principle of the characteristic parameters of the boiler furnace in the plateau area, and a correction method of the characteristic parameters of the boiler furnace in the plateau area is clear in 2003 edition 'guide rule for selecting the boiler furnace of a high-capacity pulverized coal combustion boiler'.
In the last two decades, large-capacity high-parameter units in China are rapidly developed, the unit capacity is enlarged, the steam parameter level is improved, and the coal input heat required by the units with the same capacity under the same load is reduced. In addition, in order to ensure the combustion economy of the unit under the low NOx combustion condition, a large-capacity unit mostly selects a large hearth volume, namely a small hearth thermal load parameter. Therefore, 2015 version of guide for selecting the type of the boiler furnace for the high-capacity pulverized coal combustion boiler is used for correcting the selection of the boiler furnace characteristic parameters in the plain area, but the 2002 version is still used in the correction principle of the boiler furnace characteristic parameters in the plateau area. If the correction of the characteristic parameters of the boiler furnace in the plateau area is also regulated according to the furnace selection guide rule, the excessive increase of the furnace volume can be caused. It should be noted that, as the atmospheric pressure decreases and the volume of the flue gas expands, the flow velocity of the flue gas in the hearth increases, and at this time, if the section of the hearth is not reasonably corrected, the height of the hearth increases too much in order to ensure the retention time of the pulverized coal in the furnace. In addition, boiler design can be difficult when the altitude reaches a certain height. Therefore, tracking the latest boiler technology in time and providing an optimized correction method for the boiler furnace characteristic parameters in the plateau area are necessary.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a new method for correcting the heat load parameters of the boiler furnace in the plateau area, which is more beneficial to stable combustion and burnout of the pulverized coal fired boiler in the plateau area.
Compared with the correction result of the heat load parameters of the boiler furnace in the plateau area in the high-capacity pulverized coal combustion boiler furnace model selection guide rule, the boiler in the plateau area determined according to the new correction method mainly has the following characteristics: (1) the influence on the selection of the characteristic parameters of the hearth caused by the combustion performance difference of the coal is considered. (2) The reduction range of the thermal load of the section of the hearth is lower, and the higher section thermal load is beneficial to ensuring the combustion stability of the boiler in the plateau area. (3) Under the condition of ensuring the reasonable design and arrangement of the combustor, the heat load of the wall surface of the combustor area is increased or kept unchanged as much as possible, and when the altitude is high to a certain degree, the heat load of the wall surface of the combustor area can be properly reduced if necessary to meet the design requirement of the combustor. (4) The furnace shape modified according to the new method is thin and tall, and is more beneficial to stable combustion and burnout of the pulverized coal fired boiler in the plateau area.
In order to achieve the purpose, the invention adopts the following technical scheme:
a new method for correcting the heat load parameter of a boiler hearth in a plateau area comprises the following steps:
1) grasping basic coal quality parameters of the designed coal, including total moisture MtPercent, base ash Aar% dry ashless based volatile Vdaf% received base lower calorific value Qnet,v,arMJ/kg, Total Sulfur St,ar% and ash melting point DT/ST/HT/FT ℃, and grasping the combustion performance parameters of the designed coal, including the ignition temperature IT of pulverized coal airflow, the burnout rate Bp% of the one-dimensional flame furnace and the slagging index Sc of the one-dimensional flame furnace; see table 1 for details.
TABLE 1 design basic coal quality parameters and Combustion Performance parameters for coal
Figure BDA0001574416040000031
2) Selecting boiler furnace heat load parameters in plain areas according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and specifically comprising boiler section heat load q in plain areasF(MW/m2) Flat zone boiler burner zone wall surface heat load qB(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1(m) volumetric heat load q of boiler furnace in peaceful areav(kW/m3)；
3) Calculating the heat load parameters of the boiler furnace in the plateau area according to the combustion performance of the designed coal, wherein the calculation specifically comprises the heat load q of the boiler section in the plateau areaFG(MW/m2) Heat load q of the wall of the boiler burner zone in the plateau zoneBG(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1G(m) volumetric heat load q of boiler furnace in plateau areavG(kW/m3) The specific calculation method is shown in table 2; p0kPa for IT, which is a reference atmospheric pressure corresponding to plain areas>Difficult ignition coal and medium ignition coal at 630 ℃, the altitude of a reference plain is 500m, and the corresponding reference atmospheric pressure P095.44 kPa; for easily ignited coal types with IT being less than or equal to 630 ℃, the altitude of a reference plain is 700m and the corresponding reference atmospheric pressure P093.17 kPa; p is the atmospheric pressure, kPa, corresponding to the plateau area.
TABLE 2 correction of characteristic parameters of 660MW unit boiler furnace with four corner tangent circles in plateau area
Figure BDA0001574416040000041
P is the atmospheric pressure, kPa, of the corresponding plateau area
Figure BDA0001574416040000042
Figure BDA0001574416040000043
Figure BDA0001574416040000044
Figure BDA0001574416040000045
4) The heat load parameters of the units in other combustion modes and different capacities of plateau regions can be corrected by referring to the method.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments.
Example 1:
660MW four-corner tangential firing boiler, altitude is 2445m, and design coal is soft coal with excellent combustion performance and low slagging tendency
1) The basic coal quality parameter (total moisture M) of the designed coal is graspedtPercent, base ash Aar% dry ashless based volatile Vdaf% received base lower calorific value Qnet,v,arMJ/kg, Total Sulfur St,arPercent, ash melting point DT/ST/HT/FT ℃) and combustion performance parameters (ignition temperature IT ℃ of coal dust airflow, burnout rate Bp% of one-dimensional flame furnace and slagging index Sc of one-dimensional flame furnace).
The specific coal quality parameters and combustion performance parameters for the design coal are shown in table 1.
TABLE 1 design basic coal quality parameters and Combustion Performance parameters for coal
Figure BDA0001574416040000051
2) Selecting boiler furnace heat load parameters in plain areas according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and specifically comprising boiler section heat load q in plain areasF(MW/m2) Flat zone boiler burner zone wall surface heat load qB(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1(m) volumetric heat load q of boiler furnace in peaceful areav(kW/m3)。
The IT of the engineering design coal in this period is 610 ℃, and the coal is easy to catch fire, so the corresponding altitude of the plain area is 700m, p0＝93.17kPa。Bp is 98.50%, Sc is 0.321, and is medium-grade slagging coal, the designed coal is bituminous coal with excellent combustion performance and low slagging tendency, characteristic parameters of a boiler furnace in a plain area are selected according to 2015 edition 'high-capacity pulverized coal combustion boiler furnace model selection guide rule', and finally, the thermal load parameters of the boiler furnace under plain conditions are determined as follows:
plain area boiler section heat load qF＝5.0MW/m2
Heat load q of boiler burner zone wall in plain areaB＝1.6MW/m2
Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1＝21m
Heat load q of boiler furnace volume in plain areav＝87kW/m3
3) Calculating the heat load parameters of the boiler furnace in the plateau area according to the combustion performance of the designed coal, wherein the calculation specifically comprises the heat load q of the boiler section in the plateau areaFG(MW/m2) Heat load q of the wall of the boiler burner zone in the plateau zoneBG(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1G(m) and volumetric heat load q of boiler furnace in plateau areavG(kW/m3) The specific calculation method is shown in table 2. For IT>Difficult ignition coal and medium ignition coal at 630 ℃, the altitude of a reference plain is 500m, and the corresponding reference atmospheric pressure P095.44 kPa; for easily ignited coal types with IT being less than or equal to 630 ℃, the altitude of a reference plain is 700m and the corresponding reference atmospheric pressure P093.17 kPa. P is the atmospheric pressure, kPa, corresponding to the plateau area.
TABLE 2 correction of characteristic parameters of 660MW unit boiler furnace with four corner tangent circles in plateau area
Figure BDA0001574416040000061
Figure BDA0001574416040000071
Figure BDA0001574416040000072
Figure BDA0001574416040000073
Figure BDA0001574416040000074
Figure BDA0001574416040000075
The engineering altitude of 2445m at this stage corresponds to the atmospheric pressure P of 75.20kPa
Then
Figure BDA0001574416040000076
Figure BDA0001574416040000077
Figure BDA0001574416040000078
The final correction of the thermal load parameter of the boiler furnace under the 2445m plateau condition is as follows:
qFG＝qF×(P0/P)K1＝5.0×(93.17/75.20)‐0.311＝4.678MW/m2
qBG＝qB＝1.6MW/m2
h1G＝h1×(P0/P)k3＝21×(93.17/75.20)0.642＝24.095m
qVG＝qv×(P0/P)k4＝87×(93.17/75.20)‐0.659＝75.547。
example 2:
660MW four-corner tangential firing boiler, altitude is 2445m, and design coal is soft coal with excellent combustion performance but serious slagging tendency
1) The basic coal quality parameter (total moisture M) of the designed coal is graspedtPercent, base ash Aar% dry ashless based volatile Vdaf% received base lower calorific value Qnet,v,arMJ/kg, Total Sulfur St,arPercent, ash melting point DT/ST/HT/FT ℃) and combustion performance parameters (ignition temperature IT ℃ of coal dust airflow, burnout rate Bp% of one-dimensional flame furnace and slagging index Sc of one-dimensional flame furnace). The specific coal quality parameters and combustion performance parameters for the design coal are shown in table 1.
TABLE 1 design basic coal quality parameters and Combustion Performance parameters for coal
Figure BDA0001574416040000081
2) Selecting boiler furnace heat load parameters in plain areas according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and specifically comprising boiler section heat load q in plain areasF(MW/m2) Flat zone boiler burner zone wall surface heat load qB(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1(m) volumetric heat load q of boiler furnace in peaceful areav(kW/m3)。
The IT of the engineering design coal in this period is 610 ℃, and the coal is easy to catch fire, so the corresponding altitude of the plain area is 700m, p093.17 kPa. Bp is 98.50%, Sc is 1.051, and is a serious slagging coal, the designed coal is a bituminous coal with excellent combustion performance and serious slagging tendency, the characteristic parameters of the boiler furnace in plain areas are selected according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and finally the thermal load parameters of the boiler furnace under plain conditions are determined as follows:
plain area boiler section heat load qF＝4.5MW/m2
Levelling spotZone boiler burner zone wall heat load qB＝1.5MW/m2
Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1＝23m
Heat load q of boiler furnace volume in plain areav＝73.77kW/m3
3) Calculating the heat load parameters of the boiler furnace in the plateau area according to the combustion performance of the designed coal, wherein the calculation specifically comprises the heat load q of the boiler section in the plateau areaFG(MW/m2) Heat load q of the wall of the boiler burner zone in the plateau zoneBG(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1G(m) and volumetric heat load q of boiler furnace in plateau areavG(kW/m3) The specific calculation method is shown in table 2. For IT>Difficult ignition coal and medium ignition coal at 630 ℃, the altitude of a reference plain is 500m, and the corresponding reference atmospheric pressure P095.44 kPa; for easily ignited coal types with IT being less than or equal to 630 ℃, the altitude of a reference plain is 700m and the corresponding reference atmospheric pressure P093.17 kPa. P is the atmospheric pressure, kPa, corresponding to the plateau area.
TABLE 2 correction of characteristic parameters of 660MW unit boiler furnace with four corner tangent circles in plateau area
Figure BDA0001574416040000091
Figure BDA0001574416040000092
Figure BDA0001574416040000101
Figure BDA0001574416040000102
Figure BDA0001574416040000103
The engineering altitude of 2445m at this stage corresponds to the atmospheric pressure P of 75.20kPa
The theoretical furnace thermal load parameter under 2445m plateau condition is finally modified as follows:
qFG＝qF×(P0/P)‐0.4＝4.5×(93.17/75.20)‐0.4＝4.130MW/m2
qBG＝qB＝1.5MW/m2
h1G＝h1×(P0/P)0.433＝23×(93.17/75.20)0.433＝25.237m
qVG＝qv×(P0/P)‐0.66＝73.77×(93.17/75.20)‐0.66＝64.039。
example 3:
660MW four-corner tangential firing boiler, altitude is 3500m, and design coal is soft coal with excellent combustion performance and low slagging tendency
1) The basic coal quality parameter (total moisture M) of the designed coal is graspedtPercent, base ash Aar% dry ashless based volatile Vdaf% received base lower calorific value Qnet,v,arMJ/kg, Total Sulfur St,arPercent, ash melting point DT/ST/HT/FT ℃) and combustion performance parameters (ignition temperature IT ℃ of coal dust airflow, burnout rate Bp% of one-dimensional flame furnace and slagging index Sc of one-dimensional flame furnace).
The specific coal quality parameters and combustion performance parameters for the design coal are shown in table 1.
TABLE 1 design basic coal quality parameters and Combustion Performance parameters for coal
Figure BDA0001574416040000104
Figure BDA0001574416040000111
2) According to 2015 edition' high-capacity pulverized coal combustion boiler furnaceSelecting heat load parameters of boiler furnace in plain area according to furnace selection guide rule, specifically comprising boiler section heat load q in plain areaF(MW/m2) Flat zone boiler burner zone wall surface heat load qB(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1(m) volumetric heat load q of boiler furnace in plain areav(kW/m3)。
The IT of the engineering design coal in this period is 610 ℃, and the coal is easy to catch fire, so the corresponding altitude of the plain area is 700m, p093.17 kPa. Bp is 98.50%, Sc is 0.321, and is medium-grade slagging coal, the designed coal is bituminous coal with excellent combustion performance and low slagging tendency, characteristic parameters of a boiler furnace in a plain area are selected according to 2015 edition 'high-capacity pulverized coal combustion boiler furnace model selection guide rule', and finally, the thermal load parameters of the boiler furnace under plain conditions are determined as follows:
plain area boiler section heat load qF＝5.0MW/m2
Heat load q of boiler burner zone wall in plain areaB＝1.6MW/m2
Distance h between center of uppermost layer burner and bottom of screen of boiler in plain area1＝21m
Heat load q of boiler furnace volume in plain areav＝87kW/m3
3) Calculating the heat load parameters of the boiler furnace in the plateau area according to the combustion performance of the designed coal, wherein the calculation specifically comprises the heat load q of the boiler section in the plateau areaFG(MW/m2) Heat load q of the wall of the boiler burner zone in the plateau zoneBG(MW/m2) Distance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1G(m) volumetric heat load q of boiler furnace in plateau areavG(kW/m3) The specific calculation method is shown in table 2. For IT>Difficult ignition coal and medium ignition coal at 630 ℃, the altitude of a reference plain is 500m, and the corresponding reference atmospheric pressure P095.44 kPa; for easily ignited coal types with IT being less than or equal to 630 ℃, the altitude of a reference plain is 700m and the corresponding reference atmospheric pressure P0＝93.17 kPa. P is the atmospheric pressure, kPa, corresponding to the plateau area.
TABLE 2 correction of characteristic parameters of 660MW unit boiler furnace with four corner tangent circles in plateau area
Figure BDA0001574416040000121
Figure BDA0001574416040000122
Figure BDA0001574416040000123
Figure BDA0001574416040000124
Figure BDA0001574416040000125
The engineering altitude at this stage is 3500m, and the corresponding atmospheric pressure P is 65.77kPa
Then
Figure BDA0001574416040000126
Figure BDA0001574416040000127
Figure BDA0001574416040000128
Figure BDA0001574416040000131
The theoretical furnace thermal load parameter under 3500m plateau condition is finally modified as follows:
qFG＝qF×(P0/P)K1＝5.0×(93.17/65.77)‐0.429＝4.306MW/m2
qBG＝qB×(P0/P)k2＝1.6×(93.17/65.77)‐0.066＝1.564MW/m2
h1G＝h1×(P0/P)k3＝21×(93.17/65.77)0.587＝25.761m
qVG＝qv×(P0/P)k4＝87×(93.17/65.77)‐0.746＝67.096。

Claims (1)

1. a new method for correcting the heat load parameter of a boiler hearth in a plateau area is characterized by comprising the following steps: the method comprises the following steps:
1) grasping basic coal quality parameters of the designed coal, including total moisture MtPercent, base ash Aar% dry ashless based volatile Vdaf% received base lower calorific value Qnet,v,arMJ/kg, total sulfur S of received baset,ar% and ash melting point DT/ST/HT/FT ℃; grasping the combustion performance parameters of the designed coal, including the ignition temperature IT ℃ of the pulverized coal airflow, the burnout rate Bp% of the one-dimensional flame furnace and the slagging index Sc of the one-dimensional flame furnace; see table 1 for details;
TABLE 1 design basic coal quality parameters and Combustion Performance parameters for coal
Figure FDA0002937754280000011
2) Selecting boiler furnace heat load parameters in plain areas according to 2015 version 'high-capacity pulverized coal combustion boiler furnace selection guide rule', and specifically comprising boiler section heat load q in plain areasFFlat zone boiler burner zone wall surface heat load qBDistance h between center of uppermost layer burner and bottom of screen of boiler in plain area1And the volumetric heat load q of the boiler furnace in peace and plain areasv；
3) According to the designed combustion performance of coalCalculating heat load parameters of a boiler furnace in a plateau area, specifically comprising boiler section heat load q in the plateau areaFGHeat load q of the wall of the boiler burner zone in the plateau zoneBGDistance h between center of uppermost layer burner and bottom of screen of boiler in plateau area1GAnd the volumetric heat load q of the boiler furnace in the plateau areavGThe specific calculation method is shown in table 2;
TABLE 2 correction of characteristic parameters of 660MW unit boiler furnace with four corner tangent circles in plateau area
Figure FDA0002937754280000021
Wherein:
Figure FDA0002937754280000022
Figure FDA0002937754280000023
Figure FDA0002937754280000024
Figure FDA0002937754280000025
P0kPa for IT, which is a reference atmospheric pressure corresponding to plain areas>Difficult ignition coal and medium ignition coal at 630 ℃, the altitude of a reference plain is 500m, and the corresponding reference atmospheric pressure P095.44 kPa; for easily ignited coal types with IT being less than or equal to 630 ℃, the altitude of a reference plain is 700m and the corresponding reference atmospheric pressure P093.17 kPa; p is the atmospheric pressure, kPa, corresponding to the plateau area.
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