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Products
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Heat Recovery EquipmentHeat recovery equipment is available to preheat feedwater entering the boiler (economizer) and to capture Btu’s lost through boiler blowbown (blowdown heat recovery or flash tank heat exchangers). Such equipment is normally used on installations where boiler size, operating pressures or the amount of water make-up justify the economics for the purchase and installation costs (normally units exceeding 100 hp and operating at 100 psi or more). Maintenance costs also must be considered before a decision is made for their installation. 
EconomizersEconomizers are bent, finned-tube heat exchangers. They are available in rectangular or cylindrical (see Figure 1-15) styles. The type of boiler and the overall boiler room layout may dictate which style is utilized. The boiler feedwater flows through the economizer tubes before it enters the boiler. The economizer is installed into the breeching between the flue gas outlet connection on the boiler and the stack. The products of combustion leaving the boiler flow through the economizer, over the finned tubes, transferring its heat or Btu’s to the boiler feedwater. The efficiency of the overall system can be increased by 2% to 4%, depending on fuel being burned, boiler size, and operating conditions. Blowdown EquipmentThere are several methods and equipment used in blowdown heat recovery. In most cases, the systems are used on continuous or surface blowdown to control the Total Dissolved Solids (TDS) in the boiler water. Blowdown heat recovery equipment is used for automatic control of the continuous blowdown, based on water make-up (see Figure 16) and cools the continuous blowdown to a point where it can be safely dumped to the sewer system. It transfers heat or Btu’s to the make-up water, thus raising the temperature of the make-up water before it enters the deaerator or boiler feed system.  Flash Tank Heat ExchangerAnother system uses the addition of a flash tank heat exchanger (see Figure 1-17). This system works on the same principle as the blowdown heat recovery system, however, it also provides the benefit of flash steam. This flash steam can be reused in the plant, such as being piped to a deaerator and mixed with the incoming steam in the deaerator.  
Blowdown SeparatorAn additional piece of equipment - the blowdown separator - can be installed for bottom blowdown (see Figure 1-18). The blowdown separator reduces the temperature of the bottom blowdown water to a temperature that would be safe for the sewer system. However, because of the erratic flow of bottom blowdown, there is little benefit to use a blowdown separator as a means to raise the temperature of make-up water prior to entering the deaerator or boiler feed system. Sample Cooler
During daily operation of a plant, a sample cooler is normally required to draw samples of boiler water, so chemical tests can be performed. The boiler water, however, is above the temperature that test equipment can handle. In most cases, the situation is resolved with the installation of a sample cooler (see Figure 1-19). Back to General Accessory Equipment | Back to Boiler Descriptions Holman Boiler Works has twelve locations serving Texas, the Southwest, and the Midwest: |
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