Heat Recovery Booklet
38Pages

HEAT RECOVERY SYSTEMS

TECHNICAL DOCUMENTATION

Clayton Industries produces steam generators for more than 70 years now. For more than 30 years, Clayton exhaust gas boiler systems have contributed to energy savings and recovery all over the world. Exhaust gas heat recovery systems are used in marine, industrial and power plant THE ANSWER TO ALL YOUR STEAM NEEDS For all your steam requirements, by land or by sea, Clayton has the most adequate steam products in the market - steam generators, exhaust gas boilers, and combined boilers. Clayton has more than 70 years experience and over 20,000 land and marine installations worldwide. With...

MARINE APPLICATIONS Clayton Exhaust Gas Boilers are utilized on dry cargo ships, chemical carriers, passenger ferries, reefer vessels, gas tankers, drilling rigs, fish processing vessels, FPSO's, navy and sea defense ships and wide range of the other types of ships. Generally, an installation consists of a combination of one or more fired steam generators and an exhaust gas steam generator or Clayton Industries offers world-wide spare parts delivery and service by a network of Clayton owned companies and trained distributors.

INDUSTRIAL APPLICATIONS From a practical standpoint, all of the heat in the gas above 200 °C (390 °F) can be recovered and converted to Steam can be generated using the heat from ovens, combustion of waste g asses, etc...

POWERPLANT APPLICATIONS In powerplants, there are two possible situations: a) steam generated for own use : the steam is used for: - heating up of fuel and fuel treatment - auxiliary steam - maximum generation of steam for industrial process use Clayton Industries is experienced in the design, engineering and construction of the necessary components to build a complete steam generating system. A list of world-wide references is the prove that Clayton is the correct business partner for this type of projects.World-wide presence of competent Clayton engineers and specialists assures adequate...

CLAYTON EXHAUST GAS BOILER / SECTIONAL VIEW

THE CLAYTON EXHAUST GAS BOILER AND PARTICULAR FEATURES General description: The exhaust gas boiler consists of a number of cylindrical sections, with each section containing spirally wound layers (so called pancakes), made out of plain steel tube The number of sections to be applied is depending on the boiler heat output requirements (see also page 23). The staggered configuration of the pancakes one above the other improves the heat transfer. Each pancake can expand independently to the others, according to the local temperature. Asection consists of 4 or 6 pancakes mounted in a gas tight...

FEATURES AND ADVANTAGES OF THE CLAYTON EXHAUST GAS BOILER

PROTECTION AGAINST OUTSIDE DETERIORATION OF THE TUBES Exhaust gasses contain substances which under certain conditions can form condensate on the outside of the boiler tubes. This may lead to external pipe deterioration. Corrosion can be caused by sulphur and water in the exhaust gas. It is clear that those fuels containing high content of sulphur present the highest risk for sulphuric acid corrosion. Besides sulplur, water can causeexternal pipe corrosion if condensation occurs. In order to avoid the negative effects in the best way possible, the tube wall temperature has to be above a...

Feedwater for the exhaust gas boiler is prepared in a feedwater tank. This vessel can be atmospheric or in case of a deaerator it is pressurised. The feedwater tank is often referred to as "hotwell". In the feedwater tank, fresh make-up water and condensate coming back from the installation are blended. The water in the tank is preheated in a controlled way by steam injection in order to drive out oxygen and non-condensable gasses in a natural way. The water preheating temperature is 95°C. In the same tank, chemicals for water treatment are added to the feedwater. A pump takes water from...

THE CLAYTON LAMONT SYSTEM This system is used for the larger type of power or cogen plant, or where a multiple boiler system is installed. In the Lamont system, water from the feedwater tank or deaerator is pumped to a steam drum. This drum is half filled with water and has sufficient capacity to deal with the dynamic behaviour of the system. A centrifugal pump takes water from the drum and circulates it over the exhaust gas boiler. The recirculation rate in a Lamont system is much higher than in the Clayton R- system. This results in the fact that the water in the steam drum is virtually...

Feedwater for the exhaust gas boiler is prepared in a feedwater tank. This vessel can be atmospheric or in case of a deaerator it is pressurised. The feedwater tank is often referred to as "hotwell". In the feedwater tank, fresh make-up water and condensate coming back from the installation are blended. The water in the tank is preheated in a controlled way by steam injection in order to drive out oxygen and non-condensable gasses in a natural way. The water preheating temperature is 95°C. In the same tank, water treatment chemicals are added to the feedwater. A circulation pump then pumps...

EXHAUST GAS BOILER WITH GAS SIDE BY-PASS

THE CLAYTON HOT WATER SYSTEM The Clayton exhaust gas boiler can also be used in a closed loop generating hot water. The temperature level of the water depends on the type of fuel. The miminum temperature for the water to enter the boiler however is -130° C for heavy fuel oils - 95° C fordiesel fuel oils - 70° C forgasses coming from a natural - 95°C for gasses coming from a natural gas combustion, from a diesel engine orspark ignited engine, gasses containing traces of soot and unburned lubricating oil. The primary loop contains a circulating pump, expansion vessel and heat exchanger(s)...

HOT WATER EXHAUST GAS BOILER

SUMMARY OF APPLICATIONS FOR CLAYTON EXHAUST GAS BOILERS exhaust gas quantity may be reduced if maximum heat recovery is on gas turbines with output higher than 2 MW, twin exhaust gas boilers can be applied. R - system in case of multiple units ECO-sections: see dimensions in the technical documentation.