ASME Standard Boiler Economizer With Finned Tubes For Enhanced Heat Transfer Area

ASME Standard Boiler Economizer With Finned Tubes For Enhanced Heat Transfer Area

Introduction

Economisers also lower the risk of thermal shock and sharp water temperature fluctuations when feed water enters the drum or waterwalls. Growing stricter environmental rules that limit nitrogen oxide (NOx) and sulfur dioxide (SO2) emissions can also impact economizer design. The heat transfer coefficient on the gas side is far lower than that on the water side. To make up for this, the outer surface of the tubes may be finned to boost the heat transfer surface area. The main goal of economizer design is to get the required heat transfer at the lowest cost. A key design factor for economizers is the maximum allowed flue gas velocity—higher velocities mean better heat transfer and lower capital costs.

Boiler economizers are heat exchange devices with finned tubes. They heat a liquid (often water) without bringing it to a boil (or exceeding the liquid’s boiling point). We’re able to manufacture three types of boiler economizers: bare-tube economizers, H-finned tube economizers, and spiral finned tube economizers. H-finned tube economizers are high-efficiency heat exchangers made up of H-finned tubes.

Compared to bare-tube economizers, H-finned tube economizers can increase the heat exchange surface area and reduce the number of tubes needed. They also expand the flue gas flow area, which lowers flue gas velocity and reduces wear. H-finned tubes can also be made as double H-finned tubes, which have high rigidity—making them a good fit for long tube rows. The spiral finned economizer is a newly designed heat transfer device. It uses spiral finned tubes to solve the issues of severe wear and short service life.

Technical specifications

Material Structure
Consists of a serious of spiral fin tubes, the headers of inlet and outlet, bend, frame and other auxiliaries.
Structure Arrangement
In line / staggered arrangement.

Specifications

Function

(1) The economizer is a steam generation system as like a boiler. when the exhaust gas discharge from the engine cylinder through the exhaust valve it goes to the boiler for generate steam by heating of water.

(2) After those gas it goes through the economizer the remaining exhaust gas temperature is heated the water in economiser. it help to generate steam, and it is improving the efficiency and save the fuel consumption

(3) An economizer uses the waste heat from the boiler exhaust, that would otherwise be lost to atmosphere to (in most cases) preheat the feed water into the boiler.This improves the boiler efficiency and reduces fuel costs.

Variety

Utility Boiler Economizer

Package Boiler Economizer

HRSG Economizer

Manufacturing and acceptance criteria

*Note:HD BOILER can bespoke special type of economizer according to customer's requirement.

Internal heat exchangers

1.Subcooling may also be produced by superheating the gas leaving the evaporator and heading to the gas compressor.

2.These systems withdraw heat from the liquid line but heat up the gas compressors suction.

3.This is a very common solution to insure that gas reaches the compressor and liquid reaches the valve.

4.It also allows maximum heat exchanger use as minimizes the portion of the heat exchangers used to change the temperature of the fluid,and maximizeds the volume in which the refrigerant changes its phase.