Changing Hydraulic Conductivity After Rupturing Native Structure of Peat Under Limited Evaporation Conditions

The article presents the findings of the research in the field of automatic control of peat mass quality in hollow peat pot production. The strength of the finished product determines its integrity and crumblability which affect the loss during drying and transportation. Therefore, knowing the strength characteristics we can use them for quality control. Besides, not strength but heterogeneity in the distribution of pores, moisture, and density is responsible for crumbling. Automatic regulation of effective peat mass water content is one of the main stages determining the quality. At this stage automatic control of the flow, dispersion and water content of peat mass entering the pulper tank as well as measurement and control of the amount of additional elements introduced, such as mineral components, wood pulp, and water to form the required consistency, are provided for. The models of automatic process control are built and analyzed with the methods of differential equation theory, numerical integration, and stability theory. The model is implemented with the custom-made proprietary software. The model adequacy is determined empirically by comparing the data obtained on the model with the actual technological process.

Section: Resultsmentioning

confidence: 99%

Functionality of Process Control in Moulded Goods Production

Puhova

Лебедев

2019

“…This reduces the diameter of the capillaries and, accordingly, increases the height of the rising capillary moisture. It was established experimentally that the height of the capillary rise can be increased by 20-40% [13].…”

Section: Resultsmentioning

confidence: 99%

Effect of Hydro-Physical Properties of Peat on Regulation of Peatland Drainage Systems

Misnikov

2019

The paper analyzes changes in the hydro-physical properties of peat micro- and macrosystems in the process of drainage. Maximum moisture-holding capacity of peat is used as the main characteristic. With a full drying cycle and subsequent moistening of peat, there are three stages associated with the coagulative structure formation in the system. The boundary of the transition from the state «peat in water» to the state «water in peat» is moisture content equal to one. It divides the period of structure formation into two periods, due to the predominating action of van der Waals interactions or hydrogen bonds. In the state «water in pear» the peat system loses the ability to recover its original hydro-physical properties. Scaling up the research results on peat deposits (marshes) makes it possible to classify them according to the degree of drainage of the deposit. A new approach to the use of the term «surface water body» for peat deposits is proposed.

“…The research of physical and mechanical treatment of raw peat consists in determining its technological parameters and finished product quality factors such as dispersion, ash content, and acidity [13][14][15][16]. The physical and mechanical treatment of raw peat includes four dispersion options: 1) the mixing of peat in order to provide its uniformity -'untreated peat' option 2) a single treatment on a screw conveyer operated manually 3) a three-fold treatment on the same screw conveyer 4) a ten-fold treatment on the same screw conveyer.…”

Section: Methodsmentioning

confidence: 99%

Dispersion Change in Peat Mechanical Treatment

Лебедев

Puhova

2018

The article discusses the research of peat physical and mechanical treatment which consists in determining technological parameters of peat stock. Size distribution and conditional specific surface area of peat particles are set. The relationship between processing efficiency and the content of peat fractions which size is less than 250 microns is derived. It proves to be linear. Treatment efficiency is found to be estimated by the data of a screen analysis alone and with satisfactory accuracy. Mechanical treatment has an effect on the values of total moisture capacity. The dependence is nonlinear and decreases insignificantly up to the conditional specific surface area of 350 m2/kg due to the partial grinding of fibrous coarse fractions. Mechanical treatment up to the conditional specific surface area of 500 m2/kg results in the sharp decrease of total moisture capacity due to the practically complete destruction of coarse fractions. With that of more than 500 m2/kg the values of total moisture capacity change insignificantly. Multiple peat treatment causes its mechanical consolidation and the reduction of coarse fraction content along with significant increase of fine fraction content.