Heat Integration (Batch, TSHI, Conventional)

What is the main difference between batch and continuous heat integration?

• Temperature aspect

• Pressure aspect

• Time aspect

• Flowrate aspect

Match the following

• Indirect heat exchange (with storage)

• Using intermediate fluid with heat storage to exchange heat

• Direct heat exchange

• Using intermediate fluid to exchange heat

• Indirect heat exchange (without storage)

• Process to process heat exchange using heat exchanger

Which are not the limitations of heat storage system?

• Heat loss

• Typically, more expensive than heat exchangers

• Cannot store energy for use at later time.

What are the strategies for batch heat integration?

• Debottlenecking

• Rescheduling

• Direct heat integration

• Indirect heat integration

Choose the right heat integration method.

• The company has cyclic batch process which requires a lot of heating and cooling processes.

• Batch Heat Integration

• A company looking for building a new process line with maximum heat recovery system

• Retrofit Heat Integration

• A continuous process plant with high thermal energy usages looking for retrofit opportunity.

• Total Site Heat Integration

• Several plants nearby with excess unused high temperature heat, while others require more heating.

• Conventional Heat Integration

What is the benefit of using indirect heat integration via intermediate fluid and connected with centralised utility system in the case of Total Site Heat Integration?

• Operational flexibility due to the integration with centralised utility system e.g. one of the connected plant shut down or disturbances

• Not practical to transfer long distance processes pipelines across multiple plants.

• Opportunity to sell and buy steam, and generate electricity via cogeneration, leading towards industrial symbiosis

• Increase energy usages

Reorder the following typical steps for any heat integration method.

• Energy targetting

• Stream Data Extraction

• Site Audit/Analysis

• Heat Exchanger Network Design

• Optimisation