Vertical Sprial Fin Tube Economizer In Power Plant Reduce The Thermal Stress

Economizer Description

Economizer is a device installed in the lower part of the boiler tail flue for recycling the waste heat of the exhaust smoke, heating the boiler feed water into the heating surface of saturated water under the steam drum pressure, because it absorbs the heat of high temperature flue gas, reduces the exhaust temperature of flue gas, saves energy and improves efficiency, so it is called the economizer.

H-type finned tube economizer is an efficient heat transfer economizer assembled by h-type finned tube (also called H-type finned tube, finned tube, butterfly tube).

1. Structure: The basic form is "H" type and double "H" type, arranged in line.

2. Performance characteristics:

(1) economizer with H-type finned tube economizer instead of bare tube economizer can increase the heat transfer area, reduce the number of pipe arrangement, so as to increase the flue gas circulation section, reduce the smoke speed, reduce wear.Because the wear rate of the pipe is proportional to the 3.33 power of the flue gas flow rate, if the flue gas velocity is reduced from 9M /s to 7m/s, the wear rate will be reduced to 43% of the original.At the same time, the experiment shows that the finned tube itself has the effect of making the fly ash concentrate to the middle of the tube row, so the finned tube economizer has the effect of reducing the wear on the structure.

(2) H-type finned tube can be manufactured into double pipe "double H" type finned tube, its structure is rigid, can be used in the case of long tube row.

(3) H-type finned tube economizer is arranged in line. H-type fin divides the space into several small areas, which has a flow effect on the air flow, so that the wear is greatly reduced.

(4) H-type fin can achieve the best soot blowing effect due to the formation of straight channels on both sides.

(5) Compact space, the overall weight is greatly reduced, reduce the cost.

(6) Energy saving and less power consumption: the economizer for the generator set can reduce at least two thirds of the generator smoke heat loss, and only 2 ~ 4kW power consumption per ton of steam.

(7) Simple operation and maintenance;Labor saving: economizer overall assembly factory, less moving parts, simple structure, easy to install.High level of automation, simple operation and maintenance, can reduce the operation personnel.

Function

1. Absorb the heat of low-temperature flue gas, reduce the smoke exhaust temperature, reduce smoke loss and save fuel.

2. Since the feed water is heated in the economizer before entering the drum, the heat absorption of the feed water on the heating surface is reduced, and the economizer can be used to replace part of the high-cost evaporative heating surface.

3. When the feed water temperature is raised, the wall temperature difference will be reduced and the thermal stress will be correspondingly reduced to extend the service life of the steam drum.

Specification

Application

Related Industry: Combined cycle power plant,Heat recovery steam generator(HRSG).

Economizers are commonly used as part of a heat recovery steam generator (HRSG) in a combined cycle power plant. In an HRSG, water passes through an economizer, then a boiler and then a superheater. The economizer also prevents flooding of the boiler with liquid water that is too cold to be boiled given the flow rates and design of the boiler.