Steam Peeling Pressure Control via Periodic Flow Regulation
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Solution Overview
Problem
Current steam peeling processes lack optimization in pressure and temperature control during the peeling cycle, leading to inefficient resource utilization and excessive product cooking, with unknown optimal pressure and temperature values for effective peel separation and potential deep penetration into the product flesh.
Innovation Solution
Regulating the steam charging action by admitting steam at a first rate for part of the peeling cycle and reducing the inflow for the remainder, or alternating between full-flow and reduced-flow values, to achieve a target temperature and pressure for optimal peeling while minimizing steam usage and product cooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam charging continues at full rate throughout the steaming phase, then product surface temperature is maintained at optimal peeling levels, but steam consumption increases and product cooking is excessive
Solution Approach 1:
The steam supply is operated periodically with alternating full-flow and reduced-flow phases rather than continuously at full rate. The control system switches between these flow rates based on the peeling cycle stage, achieving optimal temperature maintenance with reduced overall steam consumption by 10-20%.
Solution Approach 2:
The steam supply rate is made dynamic and adjustable rather than fixed. The system adapts the steam flow rate in real-time based on process requirements, transitioning from full-flow during initial heating to reduced-flow during maintenance phase, optimizing both temperature control and energy efficiency.
2Reliability
If steam pressure is maintained at high levels throughout the peeling cycle, then peel separation is effective, but product flesh penetration increases causing loss of usable product
Solution Approach 1:
Pressure control operates periodically with distinct phases: high pressure is applied only during the initial peeling phase when needed for effective peel separation, then reduced to lower levels during subsequent phases. This periodic pressure modulation maintains peeling effectiveness while minimizing flesh penetration and product loss.
Solution Approach 2:
The steam pressure parameter is dynamically changed throughout the peeling cycle rather than maintained constant. Pressure is adjusted to match the specific requirements of each phase - high pressure for peel separation, lower pressure for maintenance - thereby achieving reliable peeling while preserving product quality and minimizing flesh loss.
3Reliability
If steam charging duration is extended to ensure complete peeling, then peel removal is thorough, but product cooking becomes excessive reducing product value
Solution Approach 1:
The steam charging process is structured as periodic cycles with full-flow and reduced-flow phases rather than continuous operation. This periodic approach delivers the necessary thermal dose for complete peeling during the full-flow phase while using reduced-flow phases to maintain temperature without excessive cooking, thereby achieving thorough peel removal with optimized total exposure time.
Solution Approach 2:
The system maintains continuous useful thermal action on the product throughout the peeling cycle by alternating between full-flow and reduced-flow steam charging. This ensures the product surface temperature remains at optimal peeling levels without interruption, achieving complete peel removal while minimizing total steam exposure time and preventing excessive cooking.
4Reliability
If rapid steam discharge is implemented at the end of peeling, then peel separation is enhanced, but noise levels increase and equipment wear accelerates
Solution Approach 1:
The steam discharge operation is implemented periodically and controllably rather than continuously or excessively rapidly. The system uses controlled periodic discharge cycles that provide sufficient pressure differential for effective peel separation while limiting the intensity and duration of discharge events, thereby reducing noise generation and mechanical stress on equipment components.
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 steam usage by 10-20%, lowers noise levels, decreases equipment wear, and enhances peeling efficiency with reduced peel loss and improved condensate recovery, allowing for potential elimination of downstream cyclones and increased product yield.
Implementation Method 1
the steam is applied to the surface of the product within the pressure vessel and the surface temperature of the product is thereby raised
Implementation Method 2
the peel at the surface of the product which has been raised to an elevated temperature during the steaming phase separating from the underlying substance of the product, by virtue of moisture present in the peel at that stage flashing into steam
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A steam peeling system has a pressure vessel (1) which is charged with steam for a peeling cycle period at the end of which steam discharge is effected to an exhaust tank (6) via an exhaust valve (14). The steam charging action is regulated to achieve, at a predetermined stage of the peeling cycle period, a target value for a parameter indicative of a desired peeling result. This parameter may be a temperature value for an outer surface region of product to be peeled or a measure of the temperature of the steam within the pressure vessel (1). The required regulation of the steam charging action may be achieved by the supply of steam, for a first part of the peeling cycle period, to the pressure vessel (1) being effected via a main steam line (12) and on/off steam supply valve (13). At a time before the end of the peeling cycle period, the main steam supply is shut off and inflow of steam to the pressure vessel (1) is continued for at least a part of the remainder of the peeling cycle period, at a rate which is reduced compared with that available via the main steam supply route, by way of a bypass line (22). The bypass steam flow is controlled by a valve (23) in line (22) in response to control signals established by controller (27) based on a measurement by transducer (24) of the pressure within vessel (1) as present also in exhaust line (10) which is in open communication with the interior of the pressure vessel. Further arrangements to achieve pressure regulation are also described, as is a rotational programme applicable to an peeling installation using a rotary pressure vessel.