Jet Mill Plant Superheated Steam Compression Circuit
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Solution Overview
Problem
The production of superheated steam in jet mill systems is often uneconomical at low pressures due to an unfavorable enthalpy difference, and existing methods are inefficient in providing steam for applications requiring high-energy input and inert properties.
Innovation Solution
A method and system that utilize a single-stage compressor to generate superheated steam by controlling the temperature of compressed water vapor, injecting water to adjust vapor temperature, and using a saturated steam generator to compensate for leakage losses, ensuring efficient steam circulation and use in jet mill systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If superheated steam is produced in a classic boiler plant, then steam is available for jet mill applications, but the process becomes uneconomical at low pressure due to unfavorable enthalpy difference
Solution Approach 1:
The patent replaces the classic thermal boiler system with a mechanically-driven compression system. Water vapor is compressed adiabatically in a compressor, converting mechanical work directly into thermal energy, thereby generating superheated steam without the inefficient phase change process of traditional boilers. This substitution resolves the economic inefficiency at low pressures by eliminating the lost evaporation enthalpy.
Solution Approach 2:
The patent fundamentally changes the method of steam generation from thermal-phase-change (boiling) to mechanical-compression heating. By compressing water vapor in a compressor, the temperature and pressure parameters are increased directly through work input, bypassing the inefficient constant-temperature phase change of traditional boiler evaporation, thus improving energy efficiency especially at low pressures.
2Temperature
If water is injected into the compressor to control temperature, then superheated vapor temperature is controlled as a function of pressure, but the system complexity increases
Solution Approach 1:
The patent implements a feedback control system where water injection into the compressor is regulated based on the desired temperature-pressure relationship. By monitoring the compression process and adjusting water injection accordingly, the system maintains optimal superheated vapor temperature control, preventing overheating while maximizing energy efficiency. This feedback mechanism enables precise control without requiring complex external temperature regulation equipment.
3Use of energy by moving object
If a single-stage compressor is used, then all compression heat is available for use, but the thermal load on subsequent stages would be too high in multi-stage compressors
Solution Approach 1:
The patent analyzes the compression process segmentation by comparing single-stage versus multi-stage compression. In single-stage compression, all thermal energy is concentrated and available for use. In multi-stage compression, the process is segmented into intermediate stages requiring cooling, which divides the thermal energy and reduces overall efficiency. The patent concludes that single-stage compression is superior for this application as it maintains complete heat availability without the need for intermediate cooling systems.
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 allows for the economical production of superheated steam, achieving a temperature increase of up to 200°C and partially compensating for leakage losses, thereby enhancing the energy efficiency and operational effectiveness of jet mill systems.
Implementation Method 1
it is provided that the water vapor is fed to a compressor (12) to increase the pressure
Implementation Method 2
the heat generated by the compression is fully available for use
Implementation Method 3
by injecting water into the compressor, the temperature of the compressed water vapor after the compressor is controlled
Implementation Method 4
steam is supplied with a saturated steam generator on the suction side of the compressor to compensate for leakage steam losses
Data Source
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AI summary
The present invention relates to an operating method for a jet mill plant (1), wherein as operating medium for a jet mill (2) use is made of superheated water vapour at low pressure (2 to 10 bar), and the water vapour, downstream of the jet mill (2) and the separation of grist, is conducted in a circuit back into the jet mill (2) via a compressor (12) for effecting a pressure and temperature increase. The invention also provides a jet mill plant (1) having a jet mill (2) which is designed for operation with superheated water vapour at low pressure (2 to 10 bar), wherein a jet mill water vapour discharge line (outlet line 17, used steam discharge line 18, compressor feed line 19), a compressor (12) and a jet mill water vapour feed line (compressor discharge line 22, milling vapour inlet 4, nozzle feed line 23) form, together with the jet mill (2), a circuit for water vapour, such that water vapour from the jet mill (2) is conducted in a circuit back into the jet mill (2) via the compressor (12) for effecting a pressure and temperature increase.