Economizer control

Shewhart, W. A. Economic Control of the Quality of Manufactured Products. Macmillan London, 1931. 

It is recommended that the FW alkalinity be reduced below 25 mg/kg. Alkalinity of 25 mg/kg and above results in 10 mg/kg of carbon dioxide in the steam. This level of carbon dioxide can be economically controlled by the use of a neutralizing amine. If this FW alkalinity cannot be achieved, it is recommended that dealkalization of the MU water be carried out. 

Shewhart W (1931) Economic Control of Quality of Manufactured Products. Van Nostrand, New... 

Broadly speaking, the most important factors in the safe use of economic poisons are adequate information and appropriate care by all persons having any contact whatsoever with the poisons. Safety may be promoted but not ensured by voluntary control, such as the self-discipline of industry by legal control, such as regulation of sale, labeling, and distribution and by economic control, such as the refusal of food processors to buy from farmers or dealers food containing excessive residues for which no adequate method of decontamination is known. 

Shewhart WA (1931) Economic control of the quality of manufactured products. Van Nostrand, New York... 

Hydrogen could compete economically. Utilization concepts range from fuel cells to internal combustion with hydrogenated fuels. These offer flexibility without source dependency. As an energy carrier, hydrogen has some key characteristics manufactured and stored locally, economic control over energy and environmental quality. 

Not least of all it is a matter as to what extent the new product or process quality can be communicated to potential customers and is approved of or even causes enthusiasm . Guiding principles can play an important role in this case. In addition to the instraments of regulation and economic control, they are among the most interesting approaches from the group of informational control instraments (3 generation). 

Proven Control Measures. Experience has shown that risks in the occupational environment can be economically controlled (38). 

Atrazine and simazine have been widely used in warm-season turf for many years to control broadleaf weeds and certain grass weeds. They provide economical control at selective rates in commercial and homeowner turf and in sod production of certain species. Triazines continue to have a place in turf, even with the development of new turf herbicides. 

Economic Control of Quality of the Manufactured Product. New York D. Van Nostrand Co., Inc. 

Control by attempting to remove infested trees from the forest is particularly difficult because only 4-6 weeks are available from the time the infested trees can be identified by their yellowing crowns until the broods begin to emerge. In a country such as Norway with large forest areas and difficult, often steep terrain, the removal of infested trees in such a short period is often impractical. The need for more effective and economic control measures was urgent. 

For each of the two scenarios, determine the most economical control device to control the dust from the ball mill. 

Under this scenario, the most economical control device is the ESP, as its EUAR is the largest (i.e., least negative) of the three. (Put another way, it has the lowest equivalent uniform annual cost.)... 

Under this scenario, the most economical control device is the wet scrubber, as it has the least negative EUAR. 

Related Calculations. Clearly, the EUAR and the selection of the most economical control device depend on the hurdle rate, even when the other inputs are held constant. Moreover, a given firm s hurdle rate can vary according to general economic conditions, the expected risk associated with a project, and other factors. Thus, the control device selection in this hypothetical situation or in any similar, real-world situation could also be affected by these factors. 

During the course of the subsequent steps, we may find that we lack suitable manipulators to achieve the desired economic control objectives. Then we must change the process design to obtain additional handles. For example, we may need to add bypass lines around heat exchangers and include auxiliary heat exchangers. 

Once we identify the dominant variables, we must also identify the manipulators (control valves) that are most suitable to control them. The manipulators are used in feedback control loops to hold the dominant variables at setpoint. The setpoints are then adjusted to achieve the desired production rate, in addition to satisfying other economic control objectives. 

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