CN112247501B - Machining process of indirect heat exchanger - Google Patents
Machining process of indirect heat exchanger Download PDFInfo
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- CN112247501B CN112247501B CN202010994878.7A CN202010994878A CN112247501B CN 112247501 B CN112247501 B CN 112247501B CN 202010994878 A CN202010994878 A CN 202010994878A CN 112247501 B CN112247501 B CN 112247501B
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- gas collecting
- collecting box
- box body
- front gas
- lower half
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
Abstract
The invention provides a processing technology of an indirect heat exchanger, which comprises the following steps: s1, manufacturing a part according to a setting drawing; s2, fixing the support frame assembly and the combustion cavity; s3, preliminarily positioning the box body at the lower half part of the front gas collecting box, the rear gas collecting box and the combustion cavity; s4, fixing the lower half integral box body of the front gas collecting box on the combustion cavity; s5, fixing the upper half integral box body of the front gas collecting box on the lower half integral box body of the front gas collecting box; s6, fixing the upper half integral box body of the front gas collecting box and the lower half integral box body of the front gas collecting box; and S7, installing a smoke exhaust interface on the upper half integral box body of the front gas collecting box, and fixing the rear gas collecting box to perform an airtight experiment. The process solves the problems of complex calculation and easy error in the process of process development; the process method is fast in calculation and high in processing accuracy.
Description
Technical Field
The invention belongs to the technical field of heat exchangers, and particularly relates to a machining process of an indirect heat exchanger.
Background
In the coating process, the curing process and equipment occupy an important position. And (3) drying after pretreatment, heating and curing of the coating, and the like all need to use curing (or drying) equipment. Hot air circulation curing is a method for heating and curing a workpiece coating by applying the principle of convection heat transfer. Hot air circulation curing equipment is generally divided into two forms of direct heating and indirect heating according to the mode of heating an air medium. The indirect heating system heats air in an air heater by using a heat source, and the heated air circulates in the drying chamber through a circulating fan. The indirectly heated hot air circulation drying chamber has clean hot air and is suitable for curing the coating with higher surface quality requirement. The air heater is the core component, and the heat source heats the circulating air of the drying chamber through the heat exchanger. The patent discloses an indirect heat exchanger machining process, which is used for solving the problems of complex calculation and high possibility of making mistakes in the process of process development. The process method is fast in calculation and high in machining accuracy.
Disclosure of Invention
In view of the above, the present invention is directed to a processing technique of an indirect heat exchanger, so as to solve the problems of complicated calculation and easy error during the process development. The process method is fast in calculation and high in machining accuracy.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an indirect heat exchanger processing technology comprises the following steps:
s1, manufacturing a combustion cavity, a support frame, a front gas collecting box, a rear gas collecting box and a smoke exhaust interface part according to a setting drawing;
s2, adjusting the positions of the support frame assembly and the combustion cavity according to the setting drawing requirements, and fixing the support frame assembly and the combustion cavity;
s3, preliminarily positioning the box body at the lower half part of the front gas collecting box and the combustion cavity, and preliminarily positioning the rear gas collecting box and the combustion cavity by using a support frame of the rear gas collecting box;
s4, installing a heat exchange tube between the lower half box body of the front gas collecting box and the rear gas collecting box, and fixing the lower half integral box body of the front gas collecting box on the combustion cavity;
s5, installing a heat exchange tube between the upper half box body of the front gas collecting box and the rear gas collecting box, and fixing the upper half integral box body of the front gas collecting box on the lower half integral box body of the front gas collecting box by using a temporary support rod;
s6, removing the temporary support rod, and fixing the upper half integral box body of the front gas collecting box and the lower half integral box body of the front gas collecting box through the connecting plate;
s7, installing a smoke exhaust interface on the upper half integral box body of the front gas collecting box, respectively sealing the outer end of the smoke exhaust interface and a connecting flange of a burner of the combustion cavity body, and sealing the rear gas collecting box by covering after sealing an asbestos pad and an asbestos rope to perform an airtight experiment.
Further, the front gas collecting box in the step S1 includes: the upper half part of the front gas collecting box is integrated, and the lower half part of the front gas collecting box is integrated;
preceding gas collecting tank lower half wholly includes: the lower half box body of the front gas collecting box and the lower half panel of the front gas collecting box;
the first half of preceding gas collecting tank wholly includes: the upper half part of the front gas collecting box body and the upper half part of the front gas collecting box panel.
Further, the rear gas collecting box in the step S1 includes: the back gas collection box body and a back cover arranged on the back gas collection box body.
Further, the diameter of any heat exchange tube in the steps S4 and S5 is 61mm, and 92 heat exchange tubes are arranged.
Further, the installation process of the heat exchange tube in any of the steps S4 and S5 is as follows:
the heat exchange tube inserted between the lower half box body of the front gas collecting box and the rear gas collecting box respectively leads the two ends of the heat exchange tube to be firmly welded with the front gas collecting box and the rear gas collecting box body, so that the requirements are strict and gas-tight, and the inspection ensures no leakage.
Further, when the upper half part of the front gas collecting box is installed in the step S5, the lower half part of the front gas collecting box is used as a reference, and a gap between the upper half part of the front gas collecting box and the lower half part of the front gas collecting box is ensured to be 20mm.
Compared with the prior art, the indirect heat exchanger processing technology has the following advantages:
the process solves the problems of complex calculation and easy error in the process of process development; the process method is fast in calculation and high in machining accuracy.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a first installation step of an indirect heat exchanger process according to an embodiment of the present invention;
FIG. 2 is a second installation schematic of an indirect heat exchanger manufacturing process according to an embodiment of the present invention;
FIG. 3 is a schematic view of a third installation of an indirect heat exchanger manufacturing process according to an embodiment of the present invention;
FIG. 4 is a fourth installation schematic of a process for manufacturing an indirect heat exchanger according to an embodiment of the present invention;
FIG. 5 is a fifth installation schematic of an indirect heat exchanger manufacturing process according to an embodiment of the present invention;
FIG. 6 is a sixth installation schematic of a process for manufacturing an indirect heat exchanger according to an embodiment of the present invention;
FIG. 7 is a seventh installation schematic of an indirect heat exchanger manufacturing process according to an embodiment of the present invention;
FIG. 8 is an eighth installation schematic of a process for manufacturing an indirect heat exchanger according to an embodiment of the present invention;
fig. 9 is a ninth installation diagram of a process for manufacturing an indirect heat exchanger according to an embodiment of the present invention.
Description of reference numerals:
1. a combustion chamber; 2. a support assembly; 3. a front gas collection tank; 4. a rear gas collecting box; 5. a rear gas collecting box bracket; 6. a heat exchange pipe; 7. a connecting flange; 8. a smoke outlet; 31. the lower half part of the front gas collecting box is a box body; 32. a lower half panel of the front gas collecting box; 33. the upper half part of the front gas collecting box body; 34. the upper panel of the front gas collecting box.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
An indirect heat exchanger processing technology comprises the following steps:
s1, manufacturing a combustion cavity, a support frame assembly, a front gas collecting box, a rear gas collecting box and a smoke exhaust interface part according to a setting drawing;
s2, adjusting the positions of the support frame assembly and the combustion cavity according to the setting drawing requirements, and fixing the support frame assembly and the combustion cavity;
s3, preliminarily positioning the box body at the lower half part of the front gas collecting box and the combustion cavity, and preliminarily positioning the rear gas collecting box and the combustion cavity by using a support frame of the rear gas collecting box;
s4, installing a heat exchange tube between the lower half box body of the front gas collecting box and the rear gas collecting box, and fixing the lower half integral box body of the front gas collecting box on the combustion cavity;
s5, installing a heat exchange tube between the upper half box body of the front gas collecting box and the rear gas collecting box, and fixing the upper half integral box body of the front gas collecting box on the lower half integral box body of the front gas collecting box by using a temporary support rod;
s6, removing the temporary support rod, and fixing the upper half integral box body of the front gas collecting box and the lower half integral box body of the front gas collecting box through the connecting plate;
s7, installing a smoke exhaust interface on the upper half integral box body of the front gas collecting box, respectively sealing the outer end of the smoke exhaust interface and a connecting flange of a burner of the combustion cavity body, and sealing the rear gas collecting box by covering after sealing an asbestos pad and an asbestos rope to perform an airtight experiment.
The front gas collecting box in the step S1 comprises: the upper half part of the front gas collecting box is integrated, and the lower half part of the front gas collecting box is integrated;
preceding gas collecting tank lower half wholly includes: the lower half box body of the front gas collecting box and the lower half panel of the front gas collecting box;
the first half of preceding gas collecting tank wholly includes: the upper half part of the front gas collecting box body and the upper half part of the front gas collecting box panel.
The rear gas collecting box in the step S1 comprises: the back gas collection box body and a back cover arranged on the back gas collection box body.
The diameter of each heat exchange tube in the step S4 and the step S5 is 61mm, the number of the heat exchange tubes is 92, the diameter of each heat exchange tube is not fixed, the number of the heat exchange tubes is not fixed, and the heat exchange tubes matched with the heat exchanger need to be installed according to the size of the actual heat exchanger.
The installation process of the heat exchange tube in any of the steps S4 and S5 is as follows:
the heat exchange tube inserted between the lower half box body of the front gas collecting box and the rear gas collecting box respectively leads the two ends of the heat exchange tube to be firmly welded with the front gas collecting box and the rear gas collecting box body, so that the requirements are strict and gas-tight, and the inspection ensures no leakage.
And when the upper half part of the front gas collecting box is installed in the step S5, the lower half part of the front gas collecting box is used as a reference, and the gap between the upper half part of the front gas collecting box and the lower half part of the front gas collecting box is ensured to be 20mm.
The required size of the heat exchanger needs to be set according to actual requirements, and the following steps are only materials and installation processes required by the heat exchanger in one embodiment;
manufacturing the combustion cavity, the support frame, the front gas collecting box, the rear gas collecting box and the smoke exhaust interface part according to a setting drawing;
the process of the smoke discharging interface comprises the following steps:
firstly, blanking according to the size of a process diagram, deburring and blunting a sharp edge; the front gas collecting box is made of SUS304 steel plate t3; cutting 2 steel plates with the size of 400mm multiplied by 739mm, cutting 2 steel plates with the size of 65mm multiplied by 380mm, cutting 2 steel plates with the size of 65mm multiplied by 500mm, wherein the side length of the angle steel is 25mm, the length of the angle steel is 2 equal-edge angle steels with the length of 300mm, the side length of the angle steel is 25mm, the length of the angle steel is 2 equal-edge angle steels with the length of 500mm,
secondly, bending, scribing, drilling and deburring according to the size of a drawing;
and finally, argon arc welding and welding assembly are carried out according to the drawing size to ensure tightness, welding slag is removed, and welding bead treatment (coating of high-temperature-resistant silver paint on the flange) is carried out.
The front gas collection box process:
firstly, blanking according to the size of a process diagram, deburring and blunting sharp edges; the front gas collecting box is made of SUS304 steel plate t3; cutting 2 steel plates with the size of 23mm multiplied by 175mm and 2 steel plates with the size of 70mm multiplied by 175 mm;
secondly, bending according to the size of a process drawing, and performing plasma hole cutting and deburring according to the size of the drawing;
and finally, assembling argon arc welding according to a general assembly drawing process to ensure air tightness, and performing welding bead treatment after welding.
And (3) combustion chamber process:
firstly, blanking is carried out according to the drawing size:
the material of the combustion cavity is SUS304 steel plate t3; cutting 1 steel plate with the size of 88 multiplied by 1059mm, 1 steel plate with the outer diameter phi 334 and the inner diameter phi 190, and deburring and sharp edge blunting according to a process drawing;
secondly, rounding by using a roller press according to the size of the drawing; bending according to the size of the craft chart;
and finally, assembling and welding according to the drawing size, removing welding slag and performing argon arc welding to ensure the air tightness, and performing welding bead treatment after welding.
And (3) a rear gas collecting box process:
firstly, blanking according to the size of a process diagram, deburring and blunting sharp edges; the rear gas collecting box is made of SUS304 steel plate t3;
secondly, bending according to the size of a process drawing, and carrying out plasma hole cutting and deburring according to the size of the drawing;
and finally, assembling argon arc welding according to a general assembly drawing process to ensure air tightness, and performing welding bead treatment after welding.
And a rear gas collection box support frame process:
blanking according to the size of a process diagram, deburring and blunting sharp edges; the material of the rear air collecting box supporting frame is a sheet metal with Q235At =10 material,
1. sheet metal blanking:
the blanking size of a sheet metal made of Q235At =10 materials is 2 pieces (removing sharp corners) of 150 x 150 corner plates;
2, the blanking size of the sheet metal made of Q235At =10 materials is 100 multiplied by 940 for 1 piece;
3. the blanking size of the square steel tube 100 x 50 x 4 is 2 pieces each of L =1061 and L = 381.5;
4. the blanking size of the square steel tube 100 x 50 x 4 is L =700 and 2 pieces;
Q235At2 100 × 50 pieces;
6. other parts are taken (deburring, sharp edge blunting);
2. welding:
1. welding the support frame according to the requirements and the size of a drawing, firmly welding, and removing welding slag;
2. plugging two ends of the steel pipe, and removing welding slag after welding; polishing and flattening;
3. coating:
derusting and deoiling the steel part, and coating high-temperature resistant silver paint. (the pulleys are in the same level after being installed and can rotate flexibly).
The support frame assembly process comprises the following steps:
1. firstly, blanking according to the size of a process diagram, deburring and blunting sharp edges; the support frame component is made of SUS304 steel plate t5, 3 steel plates with the size of 150MM x 923MM are cut, the height of channel steel is 50MM, the width of channel steel is 37MM, the thickness of channel steel is 4.5MM, and 3 pieces of the average leg thickness and the length of 1000MM are blanked according to the drawing size and the shape; deburring and blunting sharp edges; rounding machine rounding
Secondly, parts are prepared according to the detailed list, welding and assembling are carried out according to the drawing, and welding slag is removed;
and finally, removing rust and oil from the Q235A material, and coating high-temperature-resistant silver paint.
The flange connecting process comprises the following steps:
1. blanking:
t3 153 × 1059 pieces of SUS304 steel plate;
SUS304 Steel plate t10 outer diameter: phi 350 inner diameter: phi 175 pieces;
SUS304 Steel plate t5 outer diameter: phi 390 inner diameter: phi 330 pieces;
deburring and blunting sharp edges;
2. turning an outer circle and an inner hole according to the drawing size, deburring and blunting a sharp edge;
3. drawing lines, drilling holes, deburring and blunting sharp edges according to the drawing size;
4. the diameter of the rolling circle is 340mm;
5. assembling:
performing argon arc welding through welding according to a drawing, and removing welding slag; argon arc welding is carried out, the air tightness is ensured, and welding bead treatment is carried out after welding.
The specific process method comprises the following steps:
(1) The combustion chamber is lifted and placed on the support frame assembly, the position of the support frame assembly is adjusted to meet the drawing requirements, the end faces of the combustion chamber are symmetrical left and right, the center of gravity is lowest, and then the combustion chamber is welded with the combustion chamber in a communicating mode.
(2) Gas-collecting box the latter half box before the installation, gas-collecting box the latter half box perpendicular to combustion chamber axis before the requirement, spot welding initial positioning this moment.
After the rear gas collecting box supporting frame is installed, the rear gas collecting box body is installed, and 92 phi 61 Kong Zhaozheng are used to enable the rear gas collecting box body to be coaxial with the lower half part of the front gas collecting box body in a one-to-one correspondence mode. Initially positioning by using a supporting frame of the mounted gas collecting box; and checking whether the phi 61 holes on the front gas collecting box and the rear gas collecting box are coaxial in one-to-one correspondence, and welding the lower half box body of the front gas collecting box and the combustion cavity after confirming that no fault exists. The rear gas collecting box support frame cannot be welded with the rear gas collecting box.
(3) Installing partial heat exchange tubes, inserting phi 61 multiplied by 2 heat exchange tubes between the lower half box body of the front gas collecting box and the rear gas collecting box, respectively welding two ends of each heat exchange tube with the front gas collecting box body and the rear gas collecting box body firmly, requiring tightness and no air leakage, and ensuring no leakage in inspection.
(4) And the lower half panel of the front gas collecting box is welded on the box body, so that no leakage is ensured.
(5) The upper half part of the box body of the gas collection box before installation: the lower half box body of the front gas collecting box is used as a reference, the gap between the upper half and the lower half is ensured to be 20mm, the temporary support is used for preliminary positioning, the temporary support is just in one-to-one correspondence with phi 61 holes on the rear gas collecting box, and phi 61 x 2 stainless steel heat exchange tubes are coaxially inserted into the temporary support, and the synchronization step (3) is required.
(6) And the upper half panel of the front gas collecting box is welded on the upper half box body of the front gas collecting box, so that no leakage is ensured.
(7) And two ends of the connecting plate 3 are respectively and firmly welded with the upper half part and the lower half part of the front gas collecting box. At this time, the temporary support of the preliminary positioning in the step (5) should be removed. Note that no items are allowed in the 10mm gap between the upper and lower halves of the front header.
(8) Installing a smoke exhaust interface: the smoke exhaust interface is arranged on the upper half part of the front gas collecting box, so that the size can meet the requirements of a drawing, and the axis of the smoke exhaust interface is parallel to the axis of the combustion cavity.
(9) And after checking that all welding lines have no leakage, respectively sealing the outer end of the smoke exhaust interface and the connecting flange of the combustor of the combustion cavity by adding parts. The rear air collecting box is sealed by a cover after the asbestos pad and the asbestos rope are sealed.
Note that: the asbestos pad is integrally manufactured and cannot be spliced.
(10) And (3) air tightness test:
1. whether the pressure gauge is normal or not is checked during the test
2. The inspector must be present.
3. If there is a leak, it should be eliminated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The machining process of the indirect heat exchanger is characterized by comprising the following steps of:
s1, manufacturing a combustion cavity, a support frame, a front gas collecting box, a rear gas collecting box and a smoke exhaust interface part according to a setting drawing;
s2, adjusting the positions of the support frame assembly and the combustion cavity according to the setting drawing requirements, and fixing the support frame assembly and the combustion cavity;
s3, preliminarily positioning the box body at the lower half part of the front gas collecting box and the combustion cavity, and preliminarily positioning the rear gas collecting box body and the combustion cavity by using a rear gas collecting box support frame;
s4, installing a heat exchange tube between the lower half box body of the front gas collecting box and the rear gas collecting box body, and fixing the lower half integral box body of the front gas collecting box on the combustion cavity;
s5, preliminarily positioning the upper half integral box body of the front gas collecting box by using a temporary support rod with the lower half box body of the front gas collecting box as the standard, then installing a heat exchange tube between the upper half box body of the front gas collecting box and the rear gas collecting box body, and fixing the upper half integral box body of the front gas collecting box on the lower half integral box body of the front gas collecting box;
s6, removing the temporary support rod, and fixing the upper half integral box body of the front gas collecting box and the lower half integral box body of the front gas collecting box through the connecting plate;
and S7, installing a smoke exhaust interface on the upper half integral box body of the front gas collecting box, respectively adding sealing pieces at the outer end of the smoke exhaust interface and a connecting flange of a combustion cavity combustor, and sealing the rear gas collecting box body by using an asbestos pad and an asbestos rope and then covering and sealing the rear gas collecting box body to perform an airtight experiment.
2. The process of claim 1, wherein: the front gas collecting box in the step S1 comprises: the whole upper half part of the front gas collecting box and the whole lower half part of the front gas collecting box are integrated;
preceding gas collecting tank lower half wholly includes: the lower half box body of the front gas collecting box and the lower half panel of the front gas collecting box;
the first half of preceding gas collecting tank wholly includes: the upper half part of the front gas collecting box body and the upper half part of the front gas collecting box panel.
3. The process of claim 1, wherein: the rear gas collecting box in the step S1 comprises: the back gas collection box body and a back cover arranged on the back gas collection box body.
4. The process of claim 1, wherein: the diameter of the heat exchange tubes in the steps S4 and S5 is 61mm, and 92 heat exchange tubes are arranged.
5. The process of claim 1, wherein: the heat exchange tube installation process in the steps S4 and S5 is as follows:
and heat exchange tubes are respectively inserted among the lower half box body of the front gas collecting box, the upper half box body of the front gas collecting box and the rear gas collecting box, and the two ends of each heat exchange tube are firmly welded with the front gas collecting box and the rear gas collecting box respectively, so that the requirements of tightness and no leakage are met, and the leakage is ensured by inspection.
6. The process of claim 1, wherein: and when the upper half part of the front gas collecting box is installed in the step S5, the lower half part of the front gas collecting box is used as a reference, and the gap between the upper half part of the front gas collecting box and the lower half part of the front gas collecting box is ensured to be 20mm.
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1284450A (en) * | 1969-06-06 | 1972-08-09 | Ronald Richard Jones | Improvements in or relating to heat-exchangers |
| ATE475050T1 (en) * | 2005-08-05 | 2010-08-15 | Riello Spa | METHOD FOR PRODUCING A HEAT EXCHANGER |
| US20100116477A1 (en) * | 2006-12-14 | 2010-05-13 | Dominicus Fredericus Mulder | Assembly of baffles and seals and method of assembling a heat exchanger |
| CN102039520B (en) * | 2009-10-22 | 2012-06-27 | 广东万和新电气股份有限公司 | Manufacturing method of aluminium alloy heat exchanger for gas water heater |
| CN103900255B (en) * | 2012-12-24 | 2016-08-31 | 广东美的暖通设备有限公司 | Gas furnace and heat exchanger assemblies thereof |
| CN204404861U (en) * | 2014-12-23 | 2015-06-17 | 天津七所高科技有限公司 | The fuel-firing gas-firing heat exchanger of pyriform combustion chamber |
| CN110834180B (en) * | 2019-11-15 | 2022-05-13 | 无锡华能热能设备有限公司 | Assembling and welding processing technology for boiler pulverized coal burner |
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