Nested Inner Pipe Reducing Agent Pyrolysis System
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Solution Overview
Problem
Existing reducing agent pyrolysis systems for selective catalytic reduction apparatuses are bulky, costly, and energy-intensive due to complex piping and the need for additional components like blowers and heating devices, with concerns about reducing agent leakage and inefficient mixing ratios.
Innovation Solution
A reducing agent pyrolysis system where an inner pipe is disposed within a main pipe, with a heating device integrated inside the inner pipe, allowing direct injection of the reducing agent into the inner pipe, and controlling the exhaust gas flow rate to optimize mixing and reduce the need for external blowers and complex piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reducing agent pyrolysis system uses external blowers and heating devices to thermally decompose urea and supply ammonia to the reactor, then the reducing action is promoted, but the system occupies large space and requires complex piping configuration
Solution Approach 1:
The patent combines the blower, heating device, decomposition chamber, and ammonia injection grid into an integrated reducing agent pyrolysis unit. The outer casing houses the blower and heating device, while the inner container serves as both the decomposition chamber and ammonia supply passage, eliminating the need for separate piping systems and reducing overall system complexity.
Solution Approach 2:
The patent employs a nested structure where the inner container (decomposition chamber) is placed inside the outer casing. The inner container contains both the reducing agent supply passage and serves as the decomposition chamber, while the outer casing houses the blower and heating device. This nested arrangement reduces space occupation and simplifies the overall system configuration.
2Reliability
If a reducing agent pyrolysis system includes multiple constituent elements (blower, heating device, decomposition chamber, ammonia injection grid), then ammonia can be supplied to the reactor, but a large number of additional components are required and large space is occupied
Solution Approach 1:
The patent merges multiple functions into fewer components. The inner container simultaneously serves as the decomposition chamber and ammonia supply passage. The outer casing houses both the blower and heating device, eliminating the need for separate housings for each component and reducing overall system volume.
Solution Approach 2:
The inner container performs multiple functions: it serves as the decomposition chamber where urea is thermally decomposed, as the ammonia supply passage that delivers ammonia to the reactor, and as a structural element within the outer casing. This multi-functionality reduces the number of separate components needed.
3Reliability
If a reducing agent pyrolysis system uses a blower and heating device to operate, then reducing agent decomposition is achieved, but additional energy (electric power, fuel, or air pressure) and costs are required
Solution Approach 1:
The patent enables the system to utilize the kinetic energy of exhaust gas flow to drive the pyrolysis process. The exhaust gas flow itself provides the air pressure needed to move the reducing agent through the system, reducing or eliminating the need for external blowers and associated energy consumption.
Solution Approach 2:
The patent replaces mechanical systems (external blowers and heating devices) with a system that utilizes the natural kinetic energy and thermal energy of the exhaust gas flow to achieve reducing agent decomposition and transport, thereby reducing external energy requirements.
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 configuration minimizes system size, reduces manufacturing and operational costs, and lowers energy consumption by eliminating the need for external blowers and simplifying piping, while ensuring efficient thermal decomposition and mixing of reducing agents within the inner pipe.
Implementation Method 1
The heating device heats the reducing agent to a temperature level from 400°C to 600°C, and the heated reducing agent is supplied into the decomposition chamber. When the heated reducing agent is injected, the reducing agent is thermally decomposed into ammonia (NH3) and isocyanic acid (HNCO) by heat in the decomposition chamber.
Implementation Method 2
The blower supplies fresh air into the decomposition chamber.
Implementation Method 3
The ammonia and the isocyanic acid, which has been decomposed, are supplied into the reactor by the ammonia injection grid installed in the exhaust duct.
Data Source
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AI summary
The present disclosure relates to a reducing agent pyrolysis system for a selective catalytic reduction apparatus. The reducing agent pyrolysis system for a selective catalytic reduction apparatus according to the present disclosure includes: an elbow duct 10 which is installed on an exhaust duct at a front end of a reactor, allows exhaust gas to flow into the elbow duct 10, and allows the inflow exhaust gas to be discharged toward the reactor; an inner pipe unit 20 which is disposed in the elbow duct 10, and allows a part of the exhaust gas to flow into and be discharged from the inner pipe unit 20; a heating device 60 which is installed in the inner pipe unit 20, and heats the exhaust gas flowing into the inner pipe unit 20; and a nozzle 70 which is installed in the inner pipe unit 20, and disposed at a rear end of the heating device 60 based on a flow of the exhaust gas, and injects a reducing agent into the inner pipe unit 20.