CN102901093A - Double-way controllable material returning valve for circulating fluidized bed boiler - Google Patents

Double-way controllable material returning valve for circulating fluidized bed boiler Download PDF

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CN102901093A
CN102901093A CN2012103903345A CN201210390334A CN102901093A CN 102901093 A CN102901093 A CN 102901093A CN 2012103903345 A CN2012103903345 A CN 2012103903345A CN 201210390334 A CN201210390334 A CN 201210390334A CN 102901093 A CN102901093 A CN 102901093A
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return
bed
circulating fluidized
fluidized bed
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梁培婷
方宇晴
杨海瑞
汪佩宁
刘志
胡康涛
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Tsinghua University
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Abstract

一种用于循环流化床锅炉的双路可控回料阀,属于循环流化床锅炉的返料装置,特别涉及一种流率调节装置的设计。该回料阀的进料管内设有一分隔板,将进料管的下部分隔成两个部分,各自与一个移动填充床相连,移动填充床后又各与返料床相接,返料床后接有返料管。移动填充床和返料床下各布置有布风系统。该回料阀采用了双回路设计,实现单点进料,多点返料;其控制流率的原理在于,通过调节两个移动填充床下部的松动风的风量,改变分隔板两侧进料管的压力,从而调节进料管上部的物料进入下部分隔板两侧时的比例,实现对两个返料点物料流率的调节。该回料阀使得物料能更加均匀地进入炉膛,大大改善了大型循环流化床锅炉的床截面内热物料的回料均匀性。

Figure 201210390334

The utility model relates to a dual-way controllable feed return valve for a circulating fluidized bed boiler, which belongs to a feed return device of a circulating fluidized bed boiler, and particularly relates to the design of a flow rate regulating device. The feeding pipe of the return valve is provided with a partition plate, which divides the lower part of the feeding pipe into two parts, each of which is connected with a moving packed bed, and after the moving packed bed is connected with the returning material bed respectively, the returning material bed Then there is a return pipe. An air distribution system is arranged under the moving packed bed and the return material bed. The return valve adopts a double-circuit design to realize single-point feeding and multi-point returning; The pressure of the feed pipe can be adjusted to adjust the proportion of the material in the upper part of the feed pipe when it enters the two sides of the lower partition, so as to realize the adjustment of the material flow rate of the two return points. The return valve allows materials to enter the furnace more evenly, greatly improving the return uniformity of hot materials in the bed section of the large-scale circulating fluidized bed boiler.

Figure 201210390334

Description

一种用于循环流化床锅炉的双路可控回料阀A Two-way Controllable Return Valve for Circulating Fluidized Bed Boiler

技术领域technical field

本发明涉及一种循环流化床锅炉的回料阀的可控装置,属于循环流化床锅炉的返料装置。The invention relates to a controllable device for a return valve of a circulating fluidized bed boiler, which belongs to the return device of a circulating fluidized bed boiler.

背景技术Background technique

循环流化床锅炉技术是近十几年来迅速发展的一项高效低污染清洁燃烧枝术。国际上这项技术在电站锅炉、工业锅炉和废弃物处理利用等领域已得到广泛的商业应用,并向几十万千瓦级规模的大型循环流化床锅炉发展;国内在这方面的研究、开发和应用也逐渐兴起,已有上百台循环流化床锅炉投入运行或正在制造之中。因此循环流化床锅炉效率的提高具有十分重要的意义。Circulating fluidized bed boiler technology is a high-efficiency, low-pollution and clean combustion technology that has developed rapidly in the past ten years. Internationally, this technology has been widely used commercially in the fields of power station boilers, industrial boilers and waste treatment and utilization, and is developing towards large-scale circulating fluidized bed boilers with a scale of hundreds of thousands of kilowatts; domestic research and development in this area And applications are also gradually emerging, and hundreds of circulating fluidized bed boilers have been put into operation or are being manufactured. Therefore, it is of great significance to improve the efficiency of circulating fluidized bed boilers.

回料阀作为物料回送的装置,是循环流化床锅炉中非常重要的部件。回料阀的性能直接影响到流化床外循环的稳定性以及炉内物料分配的均匀性,从而影响流化床的效率。回料阀的作用主要是返料和密封作用,即物料通过回料阀返回至炉膛,同时又要防止炉膛的烟气从回料阀反窜至旋风分离器而影响分离器的效率。As a device for material return, the return valve is a very important part in the circulating fluidized bed boiler. The performance of the return valve directly affects the stability of the external circulation of the fluidized bed and the uniformity of material distribution in the furnace, thereby affecting the efficiency of the fluidized bed. The function of the return valve is mainly the return and sealing function, that is, the material returns to the furnace through the return valve, and at the same time, it is necessary to prevent the flue gas from the furnace from flowing back from the return valve to the cyclone separator and affect the efficiency of the separator.

目前我国循环流化床技术面临的主要问题是,随着循环流化床锅炉的大型化,炉膛床面积也相应增加,由于物料横向扩散速率的限制,锅炉运行中出现了严重温度及物料浓度横向分布的偏差。其中温度的不均匀可以采用调节给煤偏差来解决,但由各个分离器之间循环流率偏差而引起的物料浓度扩散不均仍缺乏足够操作方法来加以调整。At present, the main problem faced by my country's circulating fluidized bed technology is that with the enlargement of circulating fluidized bed boilers, the area of the furnace bed also increases accordingly. The deviation of the distribution. The inhomogeneity of temperature can be solved by adjusting the deviation of coal feeding, but the unevenness of material concentration diffusion caused by the deviation of circulation flow rate between various separators still lacks sufficient operation methods to adjust it.

国内外主要采用单路回料阀装置,也就是每个回料阀只有一个进口一个出口,这种单路返料装置返料点少,容易引起炉膛内物料分配不均,也不适合用于大型锅炉中。哈尔滨锅炉厂发明了一种气动自平衡双路回料装置(专利号为ZL 200620020679.1),实现了单点进料,两点返料的功能,能够将外循环物料更均匀地分配到更大的床面积。但在实际运行中,该气动自平衡返料阀无法在两个返料点间实现循环物料流率的人为控制,即无法根据实际工况人为调节两个物料点的返料量,因此也不能更好地解决炉膛内物料分配不均的问题。At home and abroad, the single-way feeding valve device is mainly used, that is, each feeding valve has only one inlet and one outlet. This kind of single-way feeding device has fewer returning points, which is likely to cause uneven distribution of materials in the furnace, and is not suitable for use in a large boiler. Harbin Boiler Factory invented a pneumatic self-balancing dual-channel return device (patent number ZL 200620020679.1), which realizes the function of single-point feed and two-point return, and can distribute the external circulation material more evenly to a larger bed area. However, in actual operation, the pneumatic self-balancing return valve cannot realize the artificial control of the circulating material flow rate between the two return points, that is, it is impossible to artificially adjust the return amount of the two material points according to the actual working conditions, so it cannot Better solve the problem of uneven material distribution in the furnace.

发明内容Contents of the invention

针对上述的情况,本发明提供一种循环流化床锅炉双路可控回料阀装置,在实现了单点进料多点返料的同时,可以控制各返料点间的物料的流率分配,从而优化物料分配性能,更好地解决炉膛内物料分配不均匀的问题。In view of the above situation, the present invention provides a dual-channel controllable return valve device for circulating fluidized bed boilers, which can control the flow rate of materials between each return point while realizing single-point feeding and multi-point return. distribution, so as to optimize the material distribution performance and better solve the problem of uneven material distribution in the furnace.

本发明的目的和任务是通过以下技术方案实现的:Purpose and task of the present invention are achieved through the following technical solutions:

一种循环流化床锅炉的双路可控回料阀,该回料阀包括进料管,布风装置,以及对称布置在进料管下部两侧的移动填充床、折流段、返料床和返料管;所述的移动填充床和返料床通过折流段相连接,并分别与布风装置的风室相连,其特征在于:在进料管内设有分隔板,将进料管分隔为两部分,分隔板下部与布风板相连,分隔板顶端至少要高于返料管出风口上边缘0.2米。A two-way controllable return valve for a circulating fluidized bed boiler, the return valve includes a feed pipe, an air distribution device, and a moving packed bed symmetrically arranged on both sides of the lower part of the feed pipe, a baffle section, and a feed return valve. bed and return pipe; the moving packed bed and the return bed are connected through a baffle section, and are respectively connected with the air chamber of the air distribution device. The material pipe is divided into two parts, the lower part of the partition plate is connected with the air distribution plate, and the top of the partition plate is at least 0.2 meters higher than the upper edge of the air outlet of the return pipe.

上述技术方案中,所述的分隔板的外表面设有耐火耐磨材料层。所述的折流段采用一段水平管或耐热隔板。In the above technical solution, the outer surface of the partition plate is provided with a refractory and wear-resistant material layer. The deflection section adopts a section of horizontal pipe or a heat-resistant partition.

本发明的另一技术特征还在于:两个移动填充床各自与一个松动风风室相连,两个返料床各自与一个返料风风室相连。Another technical feature of the present invention is that: each of the two moving packed beds is connected to a loose air chamber, and each of the two return beds is connected to a return air chamber.

本发明具有以下优点及突出性效果:由于进料管下段内设置有分隔板将进料管下段分成两部分,分别与移动填充床相连,通过调节两个移动填充床下的松动风风量的大小,即可改变分隔板两侧进料管的压力,从而调节进料管上段的物料进入下段分隔板两侧时的比例,实现对两个返料点物料流率的调节。The present invention has the following advantages and outstanding effects: the lower section of the feed pipe is divided into two parts by a partition plate, which are respectively connected to the moving packed bed, and the loose air volume under the two moving packed beds can be adjusted , can change the pressure of the feed pipes on both sides of the partition plate, so as to adjust the ratio of the material in the upper section of the feed pipe entering the two sides of the partition plate in the lower section, and realize the adjustment of the material flow rate of the two return points.

附图说明Description of drawings

图1为本发明提供的一种用于循环流化床锅炉的双路可控回料阀的结构示意图。(即俯视图)。Fig. 1 is a structural schematic diagram of a dual-way controllable return valve for a circulating fluidized bed boiler provided by the present invention. (i.e. top view).

图2为图1的A-A剖视图。Fig. 2 is a sectional view along line A-A of Fig. 1 .

图中:1-进料管;2-分隔板;3-返料管;4-折流段;5-布风板;6-返料床;7-移动填充床;In the figure: 1-feeding pipe; 2-partition plate; 3-returning pipe; 4-deflection section; 5-air distribution plate; 6-returning bed; 7-moving packed bed;

8-松动风风室;9-返料风风室;10-耐火耐磨材料层;11-松动风风室测压点8-loose air chamber; 9-return material air chamber; 10-refractory and wear-resistant material layer; 11-loose air chamber pressure measurement point

12—低位测压点;13—高位测压点;14—返料管出风口上边缘。12—low pressure measuring point; 13—high pressure measuring point; 14—upper edge of air outlet of return pipe.

具体实施方式Detailed ways

下面结合附图对本发明的结构、原理和具体实施方式做进一步的说明。The structure, principle and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

该双路可控回料阀包括进料管,布风装置,以及对称布置在进料管下部两侧的移动填充床7、折流段4、返料床6和返料管3;所述的移动填充床7和返料床6通过折流段4相连接,移动填充床和返料床分别与布风装置的风室相连;在进料管1内设有分隔板,将进料管分隔为两部分,分隔板下部与布风板5相连。分隔板顶端要高于返料管出风口上边缘14,一般至少要高出0.2米。The two-way controllable return valve includes a feed pipe, an air distribution device, and a moving packed bed 7 symmetrically arranged on both sides of the lower part of the feed pipe, a baffle section 4, a return bed 6 and a return pipe 3; The moving packed bed 7 and the return material bed 6 are connected through the baffle section 4, and the moving packed bed and the return material bed are respectively connected with the air chamber of the air distribution device; The pipe is divided into two parts, and the lower part of the dividing plate is connected with the air distribution plate 5 . The top of the dividing plate will be higher than the upper edge 14 of the air outlet of the return pipe, generally at least 0.2 meters higher.

本实施例中进料管的直径为1300mm。分隔板外表面衬有耐火耐磨材料(如磷酸盐砖,碳化硅材料等),分隔板的高度比返料管出风口上边缘高出1.5m。The diameter of the feed pipe in this embodiment is 1300 mm. The outer surface of the partition is lined with refractory and wear-resistant materials (such as phosphate bricks, silicon carbide materials, etc.), and the height of the partition is 1.5m higher than the upper edge of the air outlet of the return pipe.

移动填充床7和返料床6通过一折流段4连接,以增加返料的流动性。该折流段4可以为一段水平管,也可以采用耐热隔板来实现折流功能。折流段的上边缘至少低于返料管出风口的下边缘300mm。使用水平管时建议水平管长度小于250mm,使用耐热隔板时建议隔板厚度为100mm。本实施例中折流段为一段水平管,该折流段的宽度为200mm。回料阀返料管出风口下边缘高于折流段上边缘350mm。The moving packed bed 7 and the return material bed 6 are connected by a baffle section 4 to increase the fluidity of the return material. The baffle section 4 can be a section of horizontal pipe, or a heat-resistant partition can be used to realize the baffle function. The upper edge of the baffle section is at least 300mm lower than the lower edge of the air outlet of the return pipe. When using horizontal pipes, it is recommended that the length of the horizontal pipes be less than 250mm, and when using heat-resistant partitions, it is recommended that the thickness of the partitions be 100mm. In this embodiment, the baffle section is a section of horizontal pipe, and the width of the baffle section is 200mm. The lower edge of the air outlet of the return valve return pipe is 350mm higher than the upper edge of the baffle section.

布风装置的风室可以为方形风室,也可以采用锥型风室。本实施例中使用的松动风风室8和返料风风室9都是方形风室,面积为750*750mm。The air chamber of the air distribution device can be a square air chamber or a conical air chamber. The loose air chamber 8 and the return air chamber 9 used in this embodiment are all square air chambers with an area of 750*750mm.

本例中实现循环流化床物料流率可控的具体方法如下:两个移动填充床各自与一个松动风风室8相连,两个返料床各自与一个返料风风室9相连。使用单独风室的优点在于,通过调整该返料点返料风,松动风的风量,即可实现对该返料点物料流动的控制。In this example, the specific method for realizing the controllable material flow rate of the circulating fluidized bed is as follows: each of the two moving packed beds is connected to a loose air chamber 8 , and each of the two return beds is connected to a return air chamber 9 . The advantage of using a separate air chamber is that by adjusting the return air at the return point and loosening the air volume, the material flow at the return point can be controlled.

在两个松动风风室中设置两个测压点11,由于装置中布风板的阻力恒定,所以风室测压点11的压力实际上反映了移动填充床中外循环物料量的料位高度,在移动填充床中布置压力梯度低位测量点12及高位测压点13,其中高位测压点13与返料管出风口上边缘处于同一水平线上,由于高低位测点高度差恒定,因此通过高低位压力的测量,即可通过换算得到移动填充床内物料压力梯度,根据粘性滑移流理论,物料压差梯度直接反应了物料流率的大小。通过改变某侧移动填充床的松动风风量,对应的进料管中密封腿料位的高度和压力梯度将会发生改变,进而调节进料管上段的物料进入下段分隔板两侧的比例,实现对两个返料点物料流率的调节。Two pressure measuring points 11 are set in the two loose air chambers. Since the resistance of the air distribution plate in the device is constant, the pressure of the pressure measuring points 11 in the air chamber actually reflects the material level height of the external circulation material in the moving packed bed. , arrange the pressure gradient low-level measurement point 12 and high-level pressure measurement point 13 in the moving packed bed, wherein the high-level pressure measurement point 13 is on the same horizontal line as the upper edge of the air outlet of the return pipe. The measurement of high and low pressure can be converted to obtain the material pressure gradient in the moving packed bed. According to the theory of viscous slip flow, the material pressure gradient directly reflects the material flow rate. By changing the loose air volume of the moving packed bed on one side, the height and pressure gradient of the material level of the sealing leg in the corresponding feed pipe will be changed, and then the ratio of the material in the upper section of the feed pipe entering the two sides of the lower partition plate will be adjusted. Realize the adjustment of the material flow rate of the two return points.

Claims (4)

1.一种用于循环流化床锅炉的双路可控回料阀,该回料阀包括进料管(1),布风装置,以及对称布置在进料管下部两侧的移动填充床(7)、折流段(4)、返料床(6)和返料管(3);所述的移动填充床(7)和返料床(6)通过折流段(4)相连接,并分别与布风装置的风室相连,其特征在于:在进料管内设有分隔板(2),将进料管分隔为两部分;分隔板下部与布风板(5)相连,分隔板顶端至少要高于返料管出风口上边缘(14)0.2米。1. A two-way controllable return valve for a circulating fluidized bed boiler, the return valve includes a feed pipe (1), an air distribution device, and a moving packed bed symmetrically arranged on both sides of the lower part of the feed pipe (7), baffle section (4), return material bed (6) and return material pipe (3); said moving packed bed (7) and return material bed (6) are connected through baffle section (4) , and are respectively connected with the air chamber of the air distribution device, which is characterized in that: a partition plate (2) is provided in the feed pipe to divide the feed pipe into two parts; the lower part of the partition plate is connected with the air distribution plate (5) , the top of the dividing plate is at least 0.2 meters higher than the upper edge (14) of the air outlet of the return pipe. 2.如权利要求1所述的一种用于循环流化床锅炉的双路可控回料阀,其特征在于:所述的分隔板的外表面设有耐火耐磨材料层(10)。2. A dual-way controllable return valve for a circulating fluidized bed boiler as claimed in claim 1, characterized in that: the outer surface of the partition plate is provided with a refractory and wear-resistant material layer (10) . 3.如权利要求1所述的一种用于循环流化床锅炉的双路可控回料阀,其特征在于:所述的折流段采用一段水平管或耐热隔板。3. A two-way controllable return valve for a circulating fluidized bed boiler according to claim 1, characterized in that: the baffle section adopts a section of horizontal pipe or a heat-resistant partition. 4.如权利要求1所述的一种用于循环流化床锅炉的双路可控回料阀,其特征在于:两个移动填充床各自与一个松动风风室(8)相连,两个返料床各自与一个返料风风室(9)相连。4. A two-way controllable return valve for circulating fluidized bed boilers according to claim 1, characterized in that: two moving packed beds are connected to a loose air chamber (8) respectively, and two The return material beds are respectively connected with a return material air chamber (9).
CN2012103903345A 2012-10-15 2012-10-15 Double-way controllable material returning valve for circulating fluidized bed boiler Pending CN102901093A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN104696951A (en) * 2015-01-28 2015-06-10 中国神华能源股份有限公司 Boiler-in integrated coupled desulfurization and denitrification method for circulating fluidized bed boiler
CN104930502A (en) * 2015-05-14 2015-09-23 中国矿业大学 Multichannel distributing device suitable for multi-bed system circulating material balance control
WO2020039117A1 (en) 2018-08-24 2020-02-27 Sumitomo SHI FW Energia Oy An arrangement for and a method of controlling flow of solid particles and a fluidized bed reactor
CN115585455A (en) * 2022-12-12 2023-01-10 浙江百能科技有限公司 Furnace body system based on bidirectional material returning device and control method thereof

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CN104696951A (en) * 2015-01-28 2015-06-10 中国神华能源股份有限公司 Boiler-in integrated coupled desulfurization and denitrification method for circulating fluidized bed boiler
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US11331637B2 (en) 2018-08-24 2022-05-17 Sumitomo SHI FW Energia Oy Arrangement for and a method of controlling flow of solid particles and a fluidized bed reactor
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Application publication date: 20130130