阅读说明：本技术 Cfb半干法脱硫塔浇注式文丘里组件生产方法 (Production method of CFB (circulating fluidized bed) semi-dry desulfurization tower casting type Venturi assembly ) 是由 王永光 郑�硕 臧德龙 刘坤 于 2021-08-10 设计创作，主要内容包括：本发明涉及文丘里组件生产技术领域,具体地说是CFB半干法脱硫塔浇注式文丘里组件生产方法,包括制造文丘里管、制造顶板和底板和装配文丘里管、外管、顶板和底板。本申请在使用时,利用铸造的方式制造文丘里管,能保证铸件精度高,消失模铸造是一种近无余量、精确成型的新工艺,该工艺无需取模、无分型面、无砂芯,因而铸件没有飞边、毛刺和拔模斜度,铸件的表面光洁度高,重复性好,并减少了由于型芯组合而造成的尺寸误差。同时利用顶板和底板将文丘里管布置在外管内来代替整体铸造方式,不仅能降低设备的整体质量,同时能降低铸造难度(只对文丘里管进行铸造,难度低)。(The invention relates to the technical field of venturi assembly production, in particular to a method for producing a CFB semi-dry desulfurization tower casting type venturi assembly. When the process is used, the Venturi tube is manufactured by a casting mode, the casting precision can be guaranteed to be high, lost foam casting is a new process which is near to allowance-free and accurate in forming, the process does not need to take a mold, and does not have a parting surface or a sand core, so that the casting does not have burrs, burrs and draft angles, the surface smoothness of the casting is high, the repeatability is good, and the size error caused by core combination is reduced. Utilize simultaneously roof and bottom plate to arrange venturi in the outer tube and replace whole casting mode, can not only reduce the whole quality of equipment, can reduce the casting degree of difficulty simultaneously (only casting venturi, the degree of difficulty is low).)

The production method of the CFB semi-dry desulfurizing tower casting type Venturi assembly is characterized by comprising the following steps:

(1) manufacturing a Venturi tube, firstly manufacturing a foam plastic model of the Venturi tube by using an EPC (electronic product code) process, wherein the foam plastic model of the Venturi tube is thick at two ends and thin in the middle, the end part of the Venturi tube is in smooth transition with the middle part of the Venturi tube, then coating a special coating on the foam plastic model of the Venturi tube, drying the coating, placing the dried coating in a special sand box, filling dry sand, vibrating the Venturi tube in three dimensions, compacting the coating in a vacuumizing state, casting the Venturi tube in a vacuum state, gasifying the model to disappear, replacing the model with metal, copying a casting which is the same as the foam plastic model, releasing vacuum after condensing, and taking out the casting from loose sand;

(2) manufacturing a top plate and a bottom plate, selecting a circular plate with the diameter same as that of the outer ring of the tangent plane circle of the outer tube, then measuring the maximum diameter of the Venturi tube and drawing a circle with the same diameter along the circle center of the circular plate, after the central circle is drawn, three diameter lines which penetrate through the center of the central circle and equally divide the circular plate are drawn on the circular plate, after drawing the diameter lines, selecting any diameter line, measuring the distance from the center of a circle to the outer edge of the circular plate along the diameter line, measuring the distance, halving, marking the distance from the center of the circle to the edge of the circular plate by using a ruler, rotating a concentric circle concentric with the center circle by using compasses as a circle center and a mark point as a rotating point, wherein the concentric circles and the diameter line have intersection points, then another six circles surrounding the circumference of the central circle are drawn by taking the intersection points as the circle center and the radius of the central circle as the radius, cutting the six circles and the center circle out of the corresponding circular holes from the bottom plate or the top plate and leaving the rest of the bottom plate and the top plate;

(3) assemble venturi, the outer tube, roof and bottom plate, at first detain the bottom of outer tube and weld along bottom plate edge and outer tube edge with the bottom plate, with bottom plate and outer tube bottom welding together, then put venturi on the bottom plate and guarantee that the venturi lower extreme inserts and correspond circular hole in and the venturi lower extreme face is located circular hole, then carry out seal weld along circular hole gap department with venturi and bottom plate, then cover the roof board in the venturi top, the venturi upper end inserts the circular hole that the roof corresponds and the venturi upper extreme face is located circular hole, then with venturi and roof along circular hole gap department seal weld together, after venturi and roof welding are accomplished, with the roof along outward flange and outer tube up extreme seal weld together.

2. The method for producing a CFB semi-dry desulfurizing tower cast Venturi assembly according to claim 1, wherein the method comprises the following steps: the height of the Venturi tube is 1600mm-2000 mm.

Technical Field

The invention belongs to the technical field of venturi assembly production, and particularly relates to a CFB semi-dry desulfurization tower casting type venturi assembly production method.

Background

As the most important desulfurizing tower in the whole boiler desulfurization flue gas treatment technology, the Venturi tube is the core equipment for bed layer establishment, desulfurization efficiency improvement and stable operation. Traditional venturi usually adopts welding process, and the machining precision is poor, and the venturi entry is the swash plate, and it is big to produce the deformation after the operation a period and cause the system operating resistance, undulant bed adjustment performance poor that causes during the load change to cause desulfurization effect not good, cause the export emission to exceed standard, and wholly adopt cast mode preparation not only to lead to the venturi section quality heavy with the venturi section, increase the casting degree of difficulty simultaneously.

Disclosure of Invention

The invention provides a production method of a CFB semi-dry desulfurization tower casting type Venturi assembly, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme: the production method of the CFB semi-dry desulfurizing tower casting type Venturi assembly comprises the following steps:

(1) manufacturing a Venturi tube, firstly manufacturing a foam plastic model of the Venturi tube by using an EPC (electronic product code) process, wherein the foam plastic model of the Venturi tube is thick at two ends and thin in the middle, the end part of the Venturi tube is in smooth transition with the middle part of the Venturi tube, then coating a special coating on the foam plastic model of the Venturi tube, drying the coating, placing the dried coating in a special sand box, filling dry sand, vibrating the Venturi tube in three dimensions, compacting the coating in a vacuumizing state, casting the Venturi tube in a vacuum state, gasifying the model to disappear, replacing the model with metal, copying a casting which is the same as the foam plastic model, releasing vacuum after condensing, and taking out the casting from loose sand;

(2) manufacturing a top plate and a bottom plate, selecting a circular plate with the diameter same as that of the outer ring of the tangent plane circle of the outer tube, then measuring the maximum diameter of the Venturi tube and drawing a circle with the same diameter along the circle center of the circular plate, after the central circle is drawn, three diameter lines which penetrate through the center of the central circle and equally divide the circular plate are drawn on the circular plate, after drawing the diameter lines, selecting any diameter line, measuring the distance from the center of a circle to the outer edge of the circular plate along the diameter line, measuring the distance, halving, marking the distance from the center of the circle to the edge of the circular plate by using a ruler, rotating a concentric circle concentric with the center circle by using compasses as a circle center and a mark point as a rotating point, wherein the concentric circles and the diameter line have intersection points, then another six circles surrounding the circumference of the central circle are drawn by taking the intersection points as the circle center and the radius of the central circle as the radius, cutting the six circles and the center circle out of the corresponding circular holes from the bottom plate or the top plate and leaving the rest of the bottom plate and the top plate;

(3) assemble venturi, the outer tube, roof and bottom plate, at first detain the bottom of outer tube and weld along bottom plate edge and outer tube edge with the bottom plate, with bottom plate and outer tube bottom welding together, then put venturi on the bottom plate and guarantee that the venturi lower extreme inserts and correspond circular hole in and the venturi lower extreme face is located circular hole, then carry out seal weld along circular hole gap department with venturi and bottom plate, then cover the roof board in the venturi top, the venturi upper end inserts the circular hole that the roof corresponds and the venturi upper extreme face is located circular hole, then with venturi and roof along circular hole gap department seal weld together, after venturi and roof welding are accomplished, with the roof along outward flange and outer tube up extreme seal weld together.

Preferably, the venturi height is 1600mm to 2000 mm.

The invention has the beneficial effects that: when the process is used, the Venturi tube is manufactured by a casting mode, the casting precision can be guaranteed to be high, lost foam casting is a new process which is near to allowance-free and accurate in forming, the process does not need to take a mold, and does not have a parting surface or a sand core, so that the casting does not have burrs, burrs and draft angles, the surface smoothness of the casting is high, the repeatability is good, and the size error caused by core combination is reduced. Utilize simultaneously roof and bottom plate to arrange venturi in the outer tube and replace whole casting mode, can not only reduce the whole quality of equipment, can reduce the casting degree of difficulty simultaneously (only casting venturi, the degree of difficulty is low).

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a venturi section configuration;

fig. 2 is a top view of fig. 1.

Shown in the figure:

1. venturi tube, 2, top plate, 3, outer tube, 4, bottom plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A production method of a CFB semi-dry desulfurizing tower casting type Venturi assembly is shown in figure 1. The method comprises the following steps:

(1) manufacturing a Venturi tube 1, firstly manufacturing a foam plastic model of the Venturi tube 1 by using an EPC (electronic product code) process, wherein the foam plastic model of the Venturi tube 1 is thick at two ends and thin in the middle, the end part is in smooth transition with the middle, the height of the foam plastic model of the Venturi tube 1 is 1600mm-2000mm, then coating a special coating on the foam plastic model of the Venturi tube 1, drying the foam plastic model, placing the foam plastic model of the Venturi tube 1 in a special sand box, filling dry sand, vibrating the foam plastic model in three dimensions and compacting, casting in a vacuumizing state, gasifying and disappearing the model, replacing the model with metal, copying a casting identical to the foam plastic model, releasing vacuum after condensing, and taking out the casting from loose sand;

(2) manufacturing a top plate 2 and a bottom plate 4, selecting a circular plate with the diameter same as the diameter of the outer ring of a tangent circle of an outer tube 3, measuring the maximum diameter of a Venturi tube 1, drawing a circle with the same diameter along the center of the circular plate, drawing three diameter lines passing through the center of the circular plate of the center circle on the circular plate, equally dividing the circular plate by the diameter lines, drawing a diameter line, selecting any diameter line, measuring the distance from the center of the circular plate to the outer edge of the circular plate along the diameter line, measuring the distance, halving the distance, marking the distance from the center of the circular plate to the edge of the circular plate by using a ruler, measuring the half distance from the center of the circular plate by using compasses as a circle center, rotating a concentric circle concentric with the center circle by using a mark point as a rotation point, wherein the concentric circle has a cross point with the diameter line, drawing other six circles surrounding the circumference of the center circle by using the cross point as the center circle center radius, cutting the six circles and the center circle from the bottom plate 4 or the top plate 2 to obtain corresponding circular holes, and leaving the remaining bottom plate 4 and the top plate 2 (ii) a

(3) Assembling the Venturi tube 1, the outer tube 3, the top plate 2 and the bottom plate 4, firstly buckling the bottom plate 4 at the bottom end of the outer tube 3, welding the bottom plate 4 and the edge of the outer tube 3 along the edge of the bottom plate 4, welding the bottom plate 4 and the bottom end of the outer tube 3 together, then the Venturi tube 1 is placed on the bottom plate 4 and the lower end of the Venturi tube 1 is ensured to be inserted into the corresponding round hole and the lower end surface of the Venturi tube 1 is positioned in the round hole, then sealing and welding the Venturi tube 1 and the bottom plate 4 along the circular hole gap, then covering the top plate 2 above the Venturi tube 1, inserting the upper end of the Venturi tube 1 into the corresponding circular hole of the top plate 2, and positioning the upper end surface of the Venturi tube 1 in the circular hole, then sealing and welding the Venturi tube 1 and the top plate 2 together along the circular hole gap, after the venturi tube 1 and the top plate 2 are welded, the top plate 2 is hermetically welded to the upper end surface of the outer tube 3 along the outer edge.

When the process is used, the Venturi tube 1 is manufactured in a casting mode, the casting precision can be guaranteed to be high, lost foam casting is a new process which is nearly margin-free and accurate in forming, the process does not need to take a mold, a parting surface or a sand core, therefore, the casting does not have burrs, burrs or draft angles, the surface smoothness of the casting is high, the repeatability is good, and the size error caused by core combination is reduced. Utilize simultaneously roof 2 and bottom plate 4 to arrange venturi 1 in outer tube 3 and replace whole casting mode, can not only reduce the whole quality of equipment, can reduce the casting degree of difficulty simultaneously (only casting venturi 1, the degree of difficulty is low).

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.