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Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler

Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler

    • Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
    • Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
    • Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
    • Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
  • Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler

    Product Details:

    Place of Origin: JIANGSU,CHINA
    Brand Name: HD Boiler
    Certification: ASME, EN, SGS, ISO9001
    Model Number: boiler economizer

    Payment & Shipping Terms:

    Minimum Order Quantity: 1 set
    Packaging Details: seaworthy packing
    Delivery Time: 30 days
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    Detailed Product Description
    Material: Carbon Steel Or Stainless Steel,Boiler Steel,Steel Tube Fuels: Pulverized Coal
    Surface Treatment: Painted Structure: Horizontal And Vertical
    Color: Customer's Requirement Usage: Power Station

     

     

    Boiler Spare Parts Power Station Boiler Economizer for Pulverized Coal-fired CFB Boiler

     

     
    Summary
     
    There are three stages from the feed water in the boiler heated into superheated steam:feed water preheating, evaporation, and superheating. The three stages are finished on three different heating surfaces. The boiler steam and water circuit are composed of the three different heating surfaces as well as their connecting pipes. Boiler economizers are one of them, and it is right the equipment to preheat the feed water. Thus, it is the heating surface with the lowest temperature for boiler working fluid in the boiler steam and water circuit. The working fluid passing through this equipment is monophasic water(non-boiling economizer).
    Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
     
    Types
    If according to materials, economizers can be divided into steel tube economizers and iron economizers. At present, most large and medium volume boilers widely use steel tube made economizers, because they have high strength and reliable working ability, and are able to withstand impacts, meanwhile they have good performance of heat transfer, small structure and low cost. One weak point is bad corrusion resistance, but now the modern boiler feed water are strictly treated, so the problem is almost solved.
    If according to heating extension of the working fluid, economizers can be divided into non-boiling and boiling types.
    1. Boiling economizers: the outlet water temperature not only can reach the surnatured temperature, but also can make some water vapourized, the proportion is about 10-15% of total feed water, not more than 20% in case of much flow resistance caused to the working fluid.
    2. Non-boiling economizers: the outlet temperature is 20-25 degrees lower than the boiling point under pressure given.
    Most of medium-presssure boilers use boiling type economizers. This is because the latent heat of vaporization of water in medium-pressure boilers is high, and the heat of the heated water is smal. Thus it is necessary to send some water to be vaporized in boiler economizer so as to prevent unstable combusion in funaces and prevent increased consumption of metal in the heating surfaces as superheaters caused by too low outlet flue gas temperature. In addition, it can help to play the role of economizers.
    Power Station Boiler Economizer For Pulverized Coal - Fired CFB Boiler
    Superhigh pressure boilers mostly use non-boiling type economizers. This is because when the pressure is higher, the latent heat of vaporization is decreased, while heat of the heated water is getting more, so it is necessary to send some water to be heated in water wall panels so as to prevent the slagging on the heating surfaces of the furnace outlets and the furnace inside caused by too high temperatures in furnaces and of outlet flue gas. So usually superhigh pressure boilers use non-boiling type economizers.
    The main factor to consider which type of economizers is boiler's parameters. When the boiler parameters differ, the ratio of heat absorption needed in three stages to heat the working fluid make differences. So the corresponding arrangements of three heating surfaces need to change, too. To large units with high parameters, their evaporative heat absorption is less, while the heat absorption of water by heating, the heat absorption of steam by superheating, the heat absorption by reheating are quite big. Thus, non-boiling type economizers are the main type for superhigh pressure unit boilers.
     
    Functions
    1. fuel saving: the economizers are placed at the rear part of boilers. This way can decrease the smoke and gas temperatures, thus to save fuels.
    2.improve the working conditions of steam drums: due to economizers, the feed water temperature is increased when entering the steam drum. It reduces the temperature difference between the feed water and steam drum wall as well as steam drum thermal stress, so that it improve the working conditions of steam drums and increase the service life.
    3.reduce the boiler manufacturing cost: for the feed water is heated in the boiler economizers. The use of low temperature spare parts as boiler economizers to replace some of high-priced high temperature water wall panels reduces the cost to manufacture boilers.
     
     
     
    Specifications

     
    Description Boiler economizer
    Material Alloy steel, Carbon steel, SA210C ,SA213T22, etc.
    Material standard ASTM, EN or ISO etc.
    Dimension Customization
    Weight

    Min: 10 ton
    Max.:1000 ton

    Smelting Process: EF+LF + VD
    Process Material→Ingot → Hot/Cold-Rolling→ Heat treatment (Normalizing+ tempering) → Inspection →rough machining→UT →2nd Heat treatment →finishing machining →Inspection
    UT standard ASTM A388 or EN10228, etc

     
    Quality Control
     
    1. Impact test and Strength calculation report with applied materials information.
    2. 100%NDT(non-destructive inspection) report of steel plate, tube and electrode
    3. X-ray, γ-ray and liquid penetrant test inspection report (welding seam): to ensure the quality of the entire boiler
    4. Hydraulic test report: ensure the standard working pressure and safety

    Contact Details
    Zhangjiagang HuaDong Boiler Co., Ltd.

    Contact Person: Wendy

    Tel: +8618351692506

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