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Heat Exchanger for Gas Turbine Exhaust: Mechanical Engineering Applications- Report Writing Assignment
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Internal Code: MAS7287
Table 1: Gas Turbine Exhaust Properties[/caption]
Design a heat exchanger to fulfil this requirement using the LMTD method. For design purposes assume that the heat exchanger comprises of an economiser, boiler and super heater section. The maximum heat transfer coefficients that can be obtained for this type of heat exchanger design are:
[caption id="attachment_15008" align="aligncenter" width="238"]
Table 2: Maximum Heat Transfer Coefficients[/caption]
Initially calculate the product UA for each section, determine the number of tubes and their diameter. The overall tube length in each section should not exceed 4 m.
A pump has been chosen to pump the water and steam around the circuit. The test results are shown below in Table 3.
[caption id="attachment_15009" align="aligncenter" width="633"]
Table 3: Pump Test Results[/caption]
The circuit has a static head of 100 m. Using the flow resistance through the superheater and the boiler only, plot the load characteristic in the form H = Z + kQ 2 and hence determine the pump operating point. Find the power required by the pump at this operating point.
The operating point of the pump does not co-inside with the flow rate required in the heat exchanger. What can one do to ensure that they do match?
Describe briefly what is meant by a compact heat exchanger.
Report Writing Assignment:
Task: A paper mill has just purchased a 5.7 MW gas turbine for electrical power generation. To increase the overall plant efficiency and reduce the payback time it has been decided to use the exhaust gases to heat water in a heat exchanger. The company requires 12.7 tonnes/hr of steam at a pressure of 18.9 Bar and at a temperature of 315 o C. The temperature and pressure at inlet to the heat exchanger was 29 o C and 0.04 Bar. The gas turbine exhaust has the following properties: [caption id="attachment_15007" align="aligncenter" width="291"] Table 1: Gas Turbine Exhaust Properties[/caption]
Design a heat exchanger to fulfil this requirement using the LMTD method. For design purposes assume that the heat exchanger comprises of an economiser, boiler and super heater section. The maximum heat transfer coefficients that can be obtained for this type of heat exchanger design are:
[caption id="attachment_15008" align="aligncenter" width="238"] Table 2: Maximum Heat Transfer Coefficients[/caption]
Initially calculate the product UA for each section, determine the number of tubes and their diameter. The overall tube length in each section should not exceed 4 m.
A pump has been chosen to pump the water and steam around the circuit. The test results are shown below in Table 3.
[caption id="attachment_15009" align="aligncenter" width="633"] Table 3: Pump Test Results[/caption]
The circuit has a static head of 100 m. Using the flow resistance through the superheater and the boiler only, plot the load characteristic in the form H = Z + kQ 2 and hence determine the pump operating point. Find the power required by the pump at this operating point.
The operating point of the pump does not co-inside with the flow rate required in the heat exchanger. What can one do to ensure that they do match?
Describe briefly what is meant by a compact heat exchanger.