Heat Accumulator for Stabilizing District Heating Water Temperature
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Solution Overview
Problem
Industrial plants face challenges in maintaining consistent district heating water temperature due to variable waste gas production, leading to inefficient heat recovery and unnecessary heat dissipation.
Innovation Solution
An arrangement comprising a wet scrubber, heat exchangers, and a heat accumulator that stores and releases heat, using a heat pump system to stabilize district heating water temperature, allowing for efficient heat transfer and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waste gas production varies significantly over time, then heat recovery to district heating water becomes unstable, but adding an auxiliary heating system increases electricity consumption
Solution Approach 1:
The heat accumulator stores excess heat from the wet scrubber in advance during periods of high waste gas production, so that this pre-stored heat can be released later during periods of low waste gas production, eliminating the need for auxiliary heating systems and reducing electricity consumption
2Productivity
If waste gas production is low or zero, then insufficient heat is available for district heating water, but increasing auxiliary heating capacity increases electricity consumption
Solution Approach 1:
The heat accumulator ensures continuous heat supply to the district heating network by storing heat during high-production periods and releasing it during low-production periods, maintaining uninterrupted heat recovery operation without relying on electricity-consuming auxiliary systems
3Loss of energy
If heat from waste gas is not needed for district heating water, then heat is dissipated into the atmosphere, but storing and releasing heat requires additional equipment
Solution Approach 1:
The heat accumulator utilizes thermal energy storage through phase change or temperature differential in the heat storage liquid, enabling the system to capture and retain excess heat that would otherwise be wasted, while the added complexity is offset by the elimination of heat dissipation losses
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 solution reduces the impact of waste gas production variations on district heating water temperature, enhances heat recovery from waste gas, and minimizes heat dissipation, improving overall energy efficiency.
Implementation Method 1
The waste gas is conveyed through the wet scrubber and cooled therein with scrubbing liquid, whereby water vapour contained in the waste gas condenses and the released condensing heat is transferred to the scrubbing liquid
Implementation Method 2
From the scrubbing liquid, the heat is transferred to the district heating water, for example, with a heat exchanger
Implementation Method 3
a heat accumulator (107) containing heat storage liquid
Data Source
Figure 1
AI summary
The present invention relates to an arrangement for transferring heat. The arrangement comprises a wet scrubber (101) configured to transfer heat from waste gas to scrubbing liquid, a first heat exchanger (104) having a first side coupled to the wet scrubber (101) and a second side coupled to a return side and a supply side of a district heating network, means for conveying scrubbing liquid from the wet scrubber (101) through the first side of the first heat exchanger (104) to the wet scrubber (101), a heat accumulator (107) containing heat storage liquid, and a second heat exchanger (108) having a first side coupled to a top part and a bottom part of the heat accumulator (107) and a second side coupled to the return side and the supply side of the district heating network. The invention also relates to a method for transferring heat.