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Rotating air preheater-heating elements

The rotating air preheater is a regenerative high efficiency heat exchanger which utilizes the regenerative element to store the heat of the flue gas and deliver it to air.

brief introduction: The rotating air preheater is a regenerative high efficiency heat exchanger which utilizes the regenerative element to store the heat of the flue gas and deliver it to air.
  • Product introduction
  • Performance advantage
  • technical parameter
  • cases

Product introduction

The rotating air preheater is a regenerative high efficiency heat exchanger which utilizes the regenerative element to store the heat of the flue gas and deliver it to air.

According to the different parts of its rotating parts, rotating air preheater can be classified as rotor rotation of the drum-type preheater and windshield rotary preheater. The former heat storage element is arranged on the slowly rotating rotor and rotates by the rotor in turn through the flue gas and the air; the latter heat storage element is arranged on the stationary stator, and the rotating 8-shaped windshield controls the flue gas and the air flows through the regenerative element alternately. In order to prevent the series flow of flue gas and air, reduce the air leakage coefficient, the rotor or stator flow section in the circulation of the total section of 10 to 20 of the two inert areas (sealed area).

In addition, the flue gas side accounts for 50% of the total cross-section, the air side of the total cross-section of 30 to 40%. In the preheater the smoke speed is generally 8 to 12m / s, the air speed of 5.6 to 8. Increasing the flue gas rate can increase the heat transfer and improve the soot blowing capacity, but the resistance also increases. After selecting the flue gas velocity, the diameter of the preheater can be determined based on the amount of flue gas. Rotary preheater rotation speed is generally l-3r / mln. The heat element consists of. .1 a 1.25mm thin plate pressed by the wave plate and positioning plate placed between the composition. The wave form of the wave plate has a great influence on the heat exchange condition, the airflow resistance and the pollution degree of the heating surface. For the corrosive flue gas, the ceramic heat storage element is often used instead of the metal corrugated plate in the low temperature part of the preheater. 

The wear of the rotary preheater heat storage device does not lead to air leakage, so the replacement cycle is long, particularly suitable for medium and low heat recovery of flue gas heat.

Performance advantage

Hengtao has a full set of German imports Wagner enamel electrostatic dry spray line 1 set, enamel formed line 1, automatic double-roll heat exchanger plate production line 1 sets, ultrasonic surface treatment production line 1, to achieve the uncoiling, leveling,embossing,shearing, surface treatment,enameling and baking, a full automatic production line which not only improve the product productivity to reduce labor costs, and the most more important thing is to further improve the quality of the heat transfer components. Hengtao has the qualification of contracting, designing, manufacture, installation of air preheater, flue gas heater and manufacturing all kinds of enamel and ordinary heat exchanger components, spare parts. The company's annual capacity for air preheater and other auxiliary equipment is 30 sets / year , Heat exchanger components 7,000 tons / year.

Hengtao can do thermal re-calculation based on the actual operation of the air preheater. Hengtao has completed more than 50 units of the transformation of the heat exchanger components, in particular the use of electrostatic dry spray coating enamel heat transfer components which characterized of strong corrosion resistance, excellent edge coverage and excellent supreme enamel characteristics, the application capacity covers 135MW-1000MW. The customer includes five power generation groups, regional electrical group, environmental protection company and three boiler plants (Shanghai boiler, East and harbin boiler) and so on.

Our company's enamel plate adopts electrostatic spraying technology. The production process is currently the most advanced technology of enamel production technology, which is characterized by even coating, good density, chemical stability, good temperature deterioration and so on. Since enamel powder electrostatic spraying technology is friendly environmental, efficient and consistent with current national industrial development policy. The main production process is as follows: ginning → steel plate wiping → punching → spray line hanging plate → dry electrostatic spraying → turn to bake →unload plate →heating basket assembly→seal and welding basket →package

The products via electrostatic spraying process has the advantages same as enamel products except the anti-corrosion properties, edge coverage, and flexibility and other aspects of the coating is better than other enamel process. It can ensure the performance of heat transfer components and life span not less than 5000 Hour which has important significance in the overall performance of the equipment guarantee.

technical parameter

Technical Parameters

Electrostatic spraying process products, in addition to some of the advantages of enamel products, the anti-corrosion properties, edge parcels, and flexibility and other aspects of the coating is better than other enamel process, can ensure that the performance of heat transfer components and life of not less than 5000 Hour requirements, for the overall performance of the equipment guarantee has important significance.

Years of operational experience shows that the corrosion of enamel heat transfer components can be caused by a variety of reasons, such as enamel surface bubble, cracks, corners of the enamel layer of the integrity. In the enamel heat transfer element production process, the following factors affect the quality of enamel heat transfer components:

l base material

l The chemical composition of enamel raw materials

l Enamel thickness and continuous uniformity

l Surface defects of enamel layer: porosity, edge coverage and so on

l enameled technology

cases

序号 单位名称 合同内容 空预器厂家 锅炉型号 数量 合同方式
1 山东信发信源铝业有限公司 蓄热元件 东锅 2050t/h(660MW) 1 供货
2 天华化工机械及自动化研究设计院有限公司 蓄热元件 / / 1 供货
3 滨州高新铝电 蓄热元件 豪顿华 440t/h(135MW机组) 1 供货
4 东方电气集团东方锅炉股份有限公司 蓄热元件 东锅 300MW一台;600MW一台 2 供货
5 国电汉川发电有限公司 蓄热元件 东锅 3000t/h(1000MW机组) 1 供货
6 广西柳州发电有限责任公司 蓄热元件 武锅 670t/h(200MW机组) 2 供货
7 青岛金海电力设备有限公司 蓄热元件 东锅 1050t/h300MW机组) 1 供货
8 邹平县宏旭热电有限公司 蓄热元件 豪顿华 440t/h(135MW机组) 1 供货
9 华电新疆发电有限公司乌鲁木齐热电厂 蓄热元件 东锅 1050t/h300MW机组) 1 供货
10 北方联合电力有限公司乌海热电厂 蓄热元件 上锅 670t/h(200MW机组) 1 供货施工
11 秦皇岛华宇通电力科技有限公司 蓄热元件 哈锅 1050t/h300MW机组) 1 供货
12 山东金岭化工股份有限公司 蓄热元件 东锅 1050t/h(300MW) 1 供货
13 东方电气集团东方锅炉股份有限公司 蓄热元件 东锅 2050t/h(660MW) 2 供货
14 山东戈高电力技术有限公司 蓄热元件 哈锅 670t/h(300MW) 1 供货