SU1757518A1 - Method of arranging temperature sensors in storage grain pile - Google Patents

Abstract

Summary of method and in each layer of the cones of the grain mound: along the length of the warehouse in the plane of the central section of their cones, and along the width - of the displaced bases of these cones, and along the height of the grain embankments and from the walls of the warehouse, sensors are installed according to the magnitude of the sensitivity radius and thickness of the self-heating reservoir center. 5 il. THX

Description

This invention relates to the thermometry of a grain when stored in warehouses.

The purpose of the invention is to improve the quality control of the state of the grain during storage.

FIG. 1 shows the installation of thermal sensors in the grain mound of the warehouse; in fig. 2 - the same, longitudinal section; in fig. 3 - the same. cross section; in fig. 4 - installation of sensors in height; in fig. 5 is a diagram of the arrangement of sensors in terms of a warehouse

The method is carried out as follows.

During the loading of the grain store using a drop car (Fig. 2,3,5) installed on the upper conveyor, the grain mound is formed from the end wall of the warehouse in layers in the form of two conical shaped mounds (heaps) intersecting one another in the middle part of the warehouse cross section.

The thickness of the grain layer R (Fig. 9). formed from the filling of grain in the warehouse, is determined by the formula:

3.7

n2 / he

where Q is the amount of grain supplied for loading into the warehouse from a vehicle with a capacity of 10 ... 75 tons;

h - the height of the grain mound, m;

ri - bulk grain mass, kg / m3.

Since a thick self-heating center can occur in any layer of a grain mound (heap) due to the difference in moisture and temperature layers and is further aggravated by self-sorting in the lower parts of the forming cones and at the intersection of the forming cones of the grain mound, thermal sensors are installed transverse

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sl xi cl

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the section of the embankment in the middle part of the warehouse at the intersection points of the cones forming backfill and near the longitudinal walls of the warehouse at a distance defined as the height of the embankment, taking into account the sensor's radius of sensitivity.

The lower sensors (Fig. A) are installed at a distance of p + 0.5R from the floor, where p is the radius of sensitivity — the distance from the mid-plane of the heating hearth-thickness to the installation location of the sensor; Q.5R - half the thickness of the grain layer. The distance of the sensor from the longitudinal wall (Fig. 4) is determined from the expression p + 0.5R

sin a f

where “is the angle of repose of the grain mound, which characterizes the property of grain flowability. In the calculations, 30 degrees is assumed, then the distance is 2p + R.

Example. Calculation of the number of control zones (sensors) for a typical grain storehouse with flat floors with a capacity of 3.5 thousand tons, 62 20 m in size, grain loading height in the center is h-5 m, and 2.5 m at the walls. It should be noted that the share of grain storage facilities The type is about 70% of all grain storage facilities in the country.

When loading a warehouse using a drop car, taking into account its maximum filling with grain and 30 degrees, 22 grain mounds of conical shape with a diameter of DK 10 m are formed. Taking into account the parameters p and R in the mean plane of the warehouse, 3 temperature sensors are installed in height (Fig. 2 and Fig. 3), at the walls - 2 temperature sensors. Along the length of the warehouse, the sensors are installed in the grain mound of each cone and between them in the intersection zones of the forming cones (Fig. 2) with a spacing of 5 m.

In total, along the length of the grain storage, 24 sensors need to be installed. Taking into account the height of the grain mound in the mid-plane of the warehouse, 72 sensors should be installed, and along two longitudinal walls - 96 sensors.

To implement this method of arrangement, 168 sensors in a grain storage cabinet are 62 m long and 20 m wide, which

installed along the warehouse: in the center on three levels, along the walls on two levels by means of thermal suspensions (for example, a TFDS type with 24 sensors).

This method can also be applied in grain stores with sloping floors.

Using the proposed method of placement of thermal sensors with a grain mound

a warehouse with a capacity of 3.2 thousand tons and a size of m and a height of maximum warehouse loading of 5 m, 168 control zones (thermal sensors) should be installed against 300 control zones in accordance with the current Grain Storage Instructions P.5.5.2., which will significantly reduce the cost of implementation of control and increase its efficiency, eliminate damage and loss of grain during storage.

Claims (1)

The invention method for arranging thermal sensors in a grain mound of a warehouse, including placing sensors at different levels of the embankment, characterized in that, in order to improve the quality of monitoring the state of grain during storage, thermal sensors are installed at the intersection points of the grain-forming cones of the mound in width and length the warehouse and in the layers of the cones of the grain mound - along the length of the warehouse in the plane of the central section of these cones, and the width is shifted to the bases of these cones, and along the height of the grain mound of the warehouse installed at a distance of r + 0.5 R from the floor, subsequent from them in the height of the grain embankment at a distance of 2 g, and from the longitudinal and end walls - at a distance of r + 0.5 R / slna. Where R - Qt9 3.7 п2рн Q - the amount of grain supplied for loading into a warehouse (for example, with a capacity of 10 ... 75 tons), t; h - the height of the grain mound, m; pH - bulk grain mass, kg / m3; g is the radius of sensitivity of the sensor; and - the angle of repose of the grain mound. 1 . t Phage. 2 k Fig.Z Fy