Polymerization Reactor Heat Recovery Using Phase-Change Working Fluid
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Solution Overview
Problem
The production of polyolefins is an energy-intensive process, consuming significant amounts of electricity, steam, and fuel gas, leading to high production costs and inefficiencies in energy usage.
Innovation Solution
A process for recovering thermal energy from the cooling system of a polymerization reactor using a working fluid that is phase converted to provide energy in the form of heat, electricity, or mechanical power, which is then recycled back into the polyolefin production process, utilizing systems such as compression heat pumps, absorption refrigeration cycles, or Organic Rankine Cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thermal energy from the cooling system is recovered using a working fluid with phase conversion, then energy efficiency is improved and production costs are reduced, but device complexity increases
Solution Approach 1:
The patent applies phase transitions of a working fluid to recover thermal energy from the cooling system. The working fluid undergoes phase change (liquid to vapor and back) to absorb and release thermal energy, enabling efficient heat recovery and conversion to useful work or stored energy, directly resolving the energy efficiency vs. complexity contradiction
Solution Approach 2:
The patent introduces a working fluid as an intermediary substance between the cooling system and the energy storage/usage system. This intermediary enables thermal energy transfer and conversion without direct coupling, allowing flexible energy recovery while managing system complexity through modular design
2Loss of energy
If a working fluid system with phase conversion is implemented for heat recovery, then energy consumption is reduced, but the system complexity and initial investment increase
Solution Approach 1:
The system utilizes phase transitions of the working fluid to efficiently capture and store thermal energy that would otherwise be lost. The phase change mechanism provides high-density energy storage and efficient heat transfer, reducing overall energy consumption while maintaining manageable system complexity through proven thermodynamic cycles
Solution Approach 2:
The working fluid system is designed to automatically regulate thermal energy recovery based on process conditions. The phase change characteristics and system design enable self-regulating operation, reducing the need for complex control systems and minimizing operational complexity while maximizing energy recovery
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption, improves plant efficiency, and recovers wasted energy resources, thereby minimizing the energy requirements for polyolefin production.
Implementation Method 1
thermally contacting said polymerization reaction with a cooling fluid such that the cooling fluid removes thermal energy from said reaction
Implementation Method 2
thermally contacting said cooling fluid with a working fluid thereby recovering said thermal energy from said cooling fluid in said working fluid
Implementation Method 3
wherein the working fluid is phase converted thereby providing energy in the form of heat and/or electricity and/or mechanical power back to the polyolefin production process
Data Source
AI summary
The present invention relates to a process for cooling a polymerization reaction for producing polyolefin comprising the steps of:(a) thermally contacting said polymerization reaction with a cooling fluid such that the cooling fluid removes thermal energy from said reaction,(b) thermally contacting said cooling fluid with a working fluid thereby recovering said thermal energy from said cooling fluid in said working fluid, and(c) thermally contacting the cooling fluid obtained in step (b) with the polymerization reaction thereby cooling said reaction,wherein the working fluid is phase converted thereby providing energy in the form of heat and/or electricity and/or mechanical power back to the polyolefin production process.Said invention also relates to a polymerization process for producing olefin polymers in a reactor, and also relates to a process for energy optimization of energy consumption in a polymerization process and to a polymerization unit.