Steam Chemical Injection Control Using Circulation Detection
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Solution Overview
Problem
Existing chemical injection methods for steam systems are inefficient and costly, often leading to excessive chemical addition and odor problems due to the lack of steam flow meters and interlock mechanisms, causing issues during equipment stoppages.
Innovation Solution
A chemical injection method that uses pressure or temperature sensors, steam traps, and anti-siphon check valves to control the injection of water treatment chemicals based on steam circulation status, ensuring chemicals are only added when steam is present, thereby preventing excessive addition during equipment stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If corrosion inhibitors are directly added to the steam system without steam flow meters and interlock mechanisms, then the chemical injection is simple and低成本, but excessive chemical addition occurs during equipment stoppages causing odor problems
Solution Approach 1:
The patent introduces a steam circulation detection mechanism that provides feedback control for chemical injection. The detection part (steam flow meter, pressure sensor, temperature sensor, or steam trap) monitors steam circulation status and feeds this information back to the chemical injection control, which adjusts or stops chemical injection when steam circulation is absent, preventing excessive chemical addition during equipment stoppages
Solution Approach 2:
The system uses existing steam system components (steam flow meters, pressure sensors, temperature sensors, or steam traps) to detect steam circulation status, allowing the system to self-regulate chemical injection without requiring complex external control systems or expensive steam flow meters in all locations
2Reliability
If corrosion inhibitors are added to boiler feedwater or condensate system, then corrosion prevention is achieved, but a portion of the chemical remains in boiler water requiring excessive chemical addition
Solution Approach 1:
The patent extracts the chemical injection point from the boiler feedwater or condensate system and relocates it directly to the steam system. This ensures chemicals are added only where steam is present and circulated, preventing chemical accumulation in boiler water and eliminating the need for excessive chemical addition while maintaining corrosion prevention effectiveness
3Ease of operation
If chemical injection pump operates without steam circulation detection, then the injection system is simple to operate, but chemical diffusion at high concentration occurs when steam is supplied again after stoppage
Solution Approach 1:
The steam circulation detection status provides real-time feedback control for the chemical injection pump operation. The pump operates only when steam circulation is detected and stops when steam circulation is absent, preventing chemical accumulation and high concentration diffusion upon restart while maintaining simple operation through automatic control
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
Prevents excessive chemical addition and odor issues by controlling chemical injection based on steam circulation detection, optimizing chemical use and reducing costs.
Implementation Method 1
a pressure sensor, a temperature sensor, or a steam trap as a steam circulation detection part provided in the steam system
Implementation Method 2
a pressure sensor, a temperature sensor, or a steam trap as a steam circulation detection part provided in the steam system
Implementation Method 3
a steam trap and a steam circulation detection sensor of the steam trap
Implementation Method 4
a chemical injection pump for injecting the water treatment chemicals into the steam system
Implementation Method 5
the water treatment chemicals are injected into the steam system by spraying with a spray nozzle
Implementation Method 6
an anti-siphon check valve is provided in a chemical injection piping
Data Source
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AI summary
Provided is a chemical injection method for steam system for controlling injection of water treatment chemicals into a steam system, in which, in response to a pressure sensor, a temperature sensor, or a steam trap as a steam circulation detection part provided in the steam system; a chemical injection pump for injecting the water treatment chemicals into the steam system; and a steam circulation detection status of the steam circulation detection part, the injection of the water treatment chemicals by the chemical injection pump is controlled.