DYRC系列空气预热器安装、维护及操作手册(英语)

DYRC系列空气预热器安装、维护及操作手册

Installation, Maintenance and Operation Manual of DYRC Air Preheater Series 1. 安装Installation

1.1 空气预热器在安装前应检查管箱外形尺寸，并应清除管子内外的尘土、锈片等杂物，检查管子和管板的焊接质量，必要时进行渗油试验检查其严密性。Prior to installation, please check the overall dimensions of the tube-box and remove dust, rusty debris and the similar inside and outside the tubes. Check the welding quality of the tubes and tube plate and check the tightness by oil penetration test if necessary.

1.2 空气预热器吊装须使用吊挂横梁上的吊装空试吊平稳后，装入钢结构框架内。

In the course of air preheater lifting, conduct trial lifting with handling holes on the lifting beam. When all is stable, place the preheater into the steel framework.

1.3 吊挂横梁与钢结构框架结合部须填充保温材料用作密封。

Fill heat insulation material where lifting beam and steel framework connect for the purpose of sealing .

1.4 空气预热器安装到位后，中间横梁与钢结构框架焊接牢固，并除掉临时筋板。Upon the air preheater is installed in place, weld the intermediate beam and the steel framework firmly and remove the makeshift rib plate.

1.5 空气预热器安装结束后，冷、热风道同时进行风压试验，应无漏泄。

Upon the air preheater installation is completed, perform pneumatic test for the cold and hot air ducts to ensure that they are free from leakage.

1.6 在机组启动前还应进行一次全面检查，管内不得有杂物、尘土堵塞。

Prior to the unit start-up, perform overall inspections to ensure there is no debris or dust inside the tube.

1.7 波形膨胀节按图纸规定数值进行冷拉。为防止波形膨胀节变形，一般在起吊前应进行加固，安装完预热器拆除。

Perform cold drawing for bellows expansion joints according to the date specified in the figures. To prevent the deformity of bellows expansion joints, reinforce them prior to lifting as a rule and remove after preheater is installed.

2. 维护Maintenance

2.1 空气预热器运转3～6个月后进行一次一级保养，其内容和要求为：Implement first level service once upon air preheater operation for 3～6 months with the procedures and requirements as following:

2.1.1 清除空气预热器内的积灰。

Remove dust inside the air preheater.

2.1.2 检查管束，封闭破损管子，消除泄漏。

Check tube bundle, seal the damaged tubes and stop leakage.

2.2 空气预热器运转一年后进行一次二级保养，其内容和要求为：

Implement second level service once upon air preheater operation for one year with the procedures and requirements as following:

2.2.1 清除积灰并涂漆。

Remove dust and paint.

2.2.2 更换破损的管子或更换空气预热器。

Replace damaged tubes or replace air preheater.

2.3 每次停机要进行空气预热器气密性试验，漏管两端堵塞，超过15%的管数就要更换成组空气预热器。

Make a air tight test for the air preheater each down time. Block both ends of the leaky tubes and if leaky tubes account for more than 15% of the total, replace for a new set of air preheater.

2.4 排烟温度不能太低一般不得低于160℃左右防止低温腐蚀。

Exhaust temperature shall not be too low, generally no lower than 160℃to prevent low temperature corrosion

3. 操作Operation

3.1 如果机组仅作短期停炉处于热备用状态时，为避免机组热损失，通常关闭烟道挡板，这就造成了预热器内热滞留，应维持空气预热器冷风侧运转。

In case of short-period shutdown for hot standby, close the flue damper as usual to prevent from unit heat loss, which will result in heat retention inside the preheater, so continue the operation of cold air side in the air preheater.

3.2 如果机组要停运较长时间直至冷炉状态，应在燃烧器停运后，维持空气预热器继续冷风侧运转，直至进口烟道气流温度降至150℃以下。

In case of long-period shutdown till cooling, continue the operation of cold air side in the air preheater after the burner stops operation till the flow temperature from intake flue declines below 150℃ .