Analysis of perspective air preparation network designs in launch complex temperature control systems

2021 ◽  
Author(s):  
V.V. Kozlov ◽  
P.V. Krylov ◽  
E.S. Piskun
Keyword(s):  
Control Systems ◽  
Temperature Control ◽  
Dew Point ◽  
Compressed Air ◽  
Temperature Control System ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Adsorbent Regeneration ◽  
Complex Functions ◽  
Complex Temperature

The purpose of the research is to perform a comparative analysis of compressed air preparation systems on the basis of moisture content. The article discusses conventional and perspective methods for drying compressed air using condensation, adsorption and membrane technologies. The article considers a temperature control system with the required dew point of minus 25°С at the exit under standard conditions, which corresponds to the dew point temperature plus 3 °С at a pressure of 1.0 MPa, or class 4 according to GOST R ISO 8573-1–2016. The main advantages of using advanced technological drying system designs are described, including the design of a modern drier with a rotary adsorber that can reduce the dew point temperature of compressed air to minus 25…30 °С at 1.0 MPa pressure without any losses on the adsorbent regeneration. This research is the first to analyze the applicability of modern adsorption and membrane modules to the launch complex functions. All the air drying designs were considered in this paper in relation to air temperature control systems based on air refrigerators using the I-d hygrometric chart for variable pressures.

Advanced Recuperator for Compressed Air Energy Storage Plants

1986 ◽  
Author(s):  
Michael Nakhamkin ◽  
John R. Stange ◽  
Richard Marshall ◽  
Robert Pelini ◽  
Robert B. Schainker
Keyword(s):  
Energy Storage ◽  
Tube Wall ◽  
Dew Point ◽  
Compressed Air ◽  
Exhaust Gas ◽  
General Description ◽  
Compressed Air Energy Storage ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Section Design

This paper presents solutions to the extensive corrosion problems affecting recuperators in Compressed Air Energy Storage (CAES) applications. Two advanced designs for a 50 MW CAES plant were engineered: (a) a two-section counterflow arrangement with a replaceable cold end section which operates with tube wall temperatures below the exhaust gas dew point temperature, (b) a three-section design with a flow arrangement which eliminates tube wall temperatures below the exhaust gas dew point temperature. Presented in this paper are a general description, design specifics, performance and cost data for these two conceptual designs. Technical and economic analyses were performed to determine the most practical and economic design.

scholarly journals Slow Mode-Based Control Method for Multi-point Temperature Control System

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 533 ◽  
Author(s):  
Song Xu ◽  
Seiji Hashimoto ◽  
Wei Jiang ◽  
Yuqi Jiang ◽  
Katsutoshi Izaki ◽  
...  
Keyword(s):  
Control Systems ◽  
Transient Response ◽  
Temperature Control ◽  
Thermal Processing ◽  
High Performance ◽  
Control Method ◽  
Temperature Control System ◽  
Slow Mode ◽  
Point Temperature ◽  
Accurate Temperature

In recent years, thermal processing systems with integrated temperature control have been increasingly needed to achieve high quality and high performance. In this paper, responding to the growing demands for proper transient response and to provide more accurate temperature controls, a novel slow-mode-based control (SMBC) method is proposed for multi-point temperature control systems. In the proposed method, the temperature differences and the transient response of all points can be controlled and improved by making the output of the fast modes follow that of the slow mode. Both simulations and experiments were carried out, and the results were compared to conventional control methods in order to verify the effectiveness of the proposed method.

Maisotsenko Open Cycle Used for Gas Turbine Power Generation

2003 ◽  
Author(s):  
Leland Gillan ◽  
Valeriy Maisotsenko
Keyword(s):  
Gas Turbine ◽  
Thermodynamic Cycle ◽  
Dew Point ◽  
Compressed Air ◽  
Point Temperature ◽  
Tube Heat Exchanger ◽  
Dew Point Temperature ◽  
Open Cycle ◽  
Mass Exchanger ◽  
Thermodynamic Processes

The Maisotsenko Open Cycle combines the thermodynamic processes of heat exchange and evaporative cooling in a unique indirect evaporative cooler resulting in product temperatures that approach the dew point temperature, (not the wet bulb temperature) of the working gas. It is an open thermodynamic cycle utilizing several thermodynamic processes that cools a product fluid with a liquid evaporating into a gas, generally water evaporating into air from the atmosphere and returns it to the atmosphere. It is a new cycle as no other cycle can be diagramed in the same way on the psychrometric chart of a gas. In a gas turbine, the gas is air and evaporate is water. An atmospheric pressure heat and mass exchanger operating with the Maisotsenko Cycle can be used to cool compressor inlet air below the wet bulb temperature. In a high-pressure heat and mass exchanger the cycle can create a compressed air saturator using heat from the turbine exhaust gases and also cools water for heat recovery in a compressor inter-cooler. The same saturator will humidify and/or superheat the compressed air before entering a combustor to the amount desired. From a practical stand point the limit of humidification of the compressed air is the amount of heat available at a temperature above its dew point temperature from the exhaust gas and/or intercompressor coolers. The amount of superheating or humidifying of the compressed air is easily controlled and changed during operation allowing added power, or greater efficiency, (60% overall thermal efficiency) quickly and easily. The equipment uses existing shell and tube heat exchanger or plate heat exchangers technologies. There are many other benefits ranging from lower NOx to greatly reduced equipment cost compared to any other power cycle enhancement systems.

scholarly journals Sensory quality of parchment coffee subjected to drying at different air temperatures and relative humidities

2021 ◽  
Vol 10 (10) ◽  
pp. e541101019351
Author(s):  
Rodrigo Victor Moreira ◽  
Jefferson Luiz Gomes Corrêa ◽  
Leandro Levate Macedo ◽  
Cintia da Silva Araújo ◽  
Wallaf Costa Vimercati ◽  
...  
Keyword(s):  
Water Content ◽  
Temperature Control ◽  
Dry Matter ◽  
Fixed Bed ◽  
Dew Point ◽  
Drying Time ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Drying Conditions

Coffee quality is influenced by several factors, including the drying conditions. Therefore, this study evaluated the influence of the relative humidity of the drying air on the quality attributes of the coffee beverage. Arabica coffee (Coffea arabica L.) fruits were selectively harvested. The samples were dried in two steps in a fixed-bed dryer at an air speed of 0.33 ms-1. In the first step, drying was performed until the water content was 0.428 g of water g of dry matter-1, without controlling the dew point temperature. The second step was performed until the water content was 0.123 g of water/g of dry matter-1, with dew point temperature control. A total of 11 treatments were tested involving nine combinations of dry bulb temperatures of 35 and 40 °C and dew point temperatures of 2.6, 10.8, 16.2 °C, plus two dryings at 35 and 40 °C dry bulb temperature without dew point temperature control. The samples were evaluated sensorially by three certified specialty coffee tasters. The data were subjected to principal component analysis. In the sensory analysis, the samples received total scores of 83.0 to 85.5 points. The drying conditions significantly influenced the quality of the coffee beverage. Drying at a dry bulb temperature of 40 °C and a dew point temperature of 16.2 °C (25% RH) is indicated for the production of higher quality coffees with a shorter drying time.

scholarly journals Improving efficiency and lowering operating costs of evaporative cooling

2021 ◽  
Vol 338 ◽  
pp. 01027
Author(s):  
Jan Taler ◽  
Bartosz Jagieła ◽  
Magdalena Jaremkiewicz
Keyword(s):  
Electricity Consumption ◽  
Open Circuit ◽  
Dew Point ◽  
Operating Costs ◽  
Water Evaporation ◽  
Total Water ◽  
Point Temperature ◽  
Dew Point Temperature ◽  
Adiabatic Cooling ◽  
Positive Effect

Cooling towers, or so-called evaporation towers, use the natural effect of water evaporation to dissipate heat in industrial and comfort installations. Water, until it changes its state of aggregation, from liquid to gas, consumes energy (2.257 kJ/kg). By consuming this energy, it lowers the air temperature to the wet-bulb temperature, thanks to which the medium can be cooled below the ambient temperature. Evaporative solutions are characterized by continuous water evaporation (approx. 1.5% of the total water flow) and low electricity consumption (high EER). Evaporative (adiabatic) cooling also has a positive effect on the reduction of electricity consumption of cooled machines. Lowering the relative humidity (RH) by approx. 2% lowers the wet-bulb temperature by approx. 0.5°C, which increases the efficiency of the tower, operating in an open circuit, expressed in kW, by approx. 5%, while reducing water consumption and treatment costs. The use of the M-Cycle (Maisotsenko cycle) to lower the temperature of the wet thermometer to the dew point temperature will reduce operating costs and increase the efficiency of cooled machines.

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