RU2367870C1 - Continuous effect device for air preparation in air renewal systems - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention can be applied for air heating and dust removal in any industry requiring gas flow treatment and heating, particularly in drying plants of chemical and food industries and in ventilation systems of buildings. Continuous effect device for air preparation in air renewal systems includes case with chain conveyor with spring mesh inside, air duct for air supply and discharge, oil tub. Novelty of invention is comprised by transverse partitions of alternating height, dividing oil tub, mounted on section with conical bottom and maintaining oil cross flow from section to section against return air flow. Lowest oil level is maintained in section adjoining inlet air duct of return air, and highest oil level is maintained in section adjoining outlet air duct. Conical bottom of each section features lock device through which oil passes to collector connected over filter device to oil circulation system including pump, regulation treatment filter, and preliminary heating radiator for inflow air, thus maintaining oil-to-air and mesh-to-air counterflow, where oil and mesh follow direct flow. Additionally the device includes main radiator for air heating.

EFFECT: utilisation of return air heat.

1 dwg

Description

The invention can be used for heating and dust removal of air in any industry where cleaning and heating of gas flows is required, in particular in drying plants of the chemical and food industries, as well as in ventilation systems of buildings.

A known method of recovering the heat of a spent drying agent of convective dryers [US Pat. RF №2250426, class F.26B 3/00, published in bull. No. 11 of 04/20/2005], which provides for cooling the spent drying agent with transferring heat from it to the main heat carrier using contact heat transfer, heating the supply air with heat transfer to it from the additional heat carrier using contact heat transfer, heating the additional heat carrier is carried out by the main heat carrier, at water is used as the main heat carrier, and oil is used as the additional heat carrier.

A disadvantage of the known device is the structural complexity due to the presence of two coolants with two corresponding circuits of their movement and the need to use a heat exchanger to heat the main coolant.

The closest in technical essence and the achieved effect is a self-cleaning oil filter [Air purification from dust at food industry enterprises. - M .: Agropromizdat, 1989. - 318 p.], Air purification, in which it occurs when it passes successively through moving spring grids fixed on a chain conveyor. When the spring grids move, they are immersed in the oil bath in the lower section of the chains and are cleaned of dust settled on them. Oil in the bath is periodically replaced. Cleaning the sediment from the oil in the bath occurs periodically as it accumulates.

The disadvantage of this type of filter is the loss of heat from the exhaust air.

The objective of the invention is the utilization of the heat of the exhaust air.

The objective of the invention is achieved in that in a continuous device for preparing air in air exchange systems, including a housing with a chain conveyor located inside it with spring grids, an air duct for supplying and discharging air, an oil bath, it is new that the oil bath is divided by transverse partitions of variable height on the section with a conical bottom, and the partitions are made in such a way as to ensure the flow of oil from the section into the section towards the flow of exhaust air and so that in the section adjacent to the supply duct of the exhaust air, to ensure the lowest oil level, and in the section adjacent to the exhaust duct, the highest, while the conical bottom of each section is equipped with a shut-off device through which the oil passes into the manifold connected through a filtering device to the system circulation of oil, including a pump, a control filter and a heater for preheating the supply air, which provides a counter-flow of oil-air and mesh-air, while oil and mesh for direct flow, and the main air heater for heating air.

The technical result consists in the utilization of the heat of the exhaust air.

The drawing shows a diagram of a continuous device for the preparation of air in air exchange systems.

A device for preparing air in air exchange systems comprises a housing 1 with a supply exhaust air duct and a discharge duct (purified air), inside of which there is a chain conveyor 2, on which grids 3 are pivotally mounted (the conveyor drive is not shown conditionally). In the lower part of the conveyor there is a bath with oil 4, which is divided by transverse partitions of variable height into sections with a conical bottom, and the partitions are made in such a way as to ensure the flow of oil from section to section towards the air flow. The conical bottom of each section is equipped with a nozzle 5, equipped with shut-off devices 6, through which oil passes to a manifold 7, connected through an oil filter 8. By a pipe 9, the filter outlet pipe is connected to the inlet pipe of the oil pump 10.

The pump outlet through the control filter 11 is connected to the inlet of the air heater for preheating fresh air with oil 12.

Further along the supply air in the air duct 13, the main air heater 14 is installed for heating the air. The locking device 15 is designed to disable the oil circulation system during its repair. Devices for measuring the parameters of the system are not an object of the invention and are not conventionally shown in the diagram.

A continuous device for preparing air in air exchange systems works as follows.

The heated dusty exhaust air enters the housing 1 through the exhaust air supply duct, passes sequentially through several nets 3 fixed on the conveyor chains 2, moistened with oil in the lower sections of the bath 4. The chain conveyor with nets is driven by a drive (in the drawing it is conditionally not shown). The nets and the oil on them heat up when they come in contact with the air, the oil heats up when the nets are lowered into the bathtub, due to the difference in levels, it flows into the next section, where it contacts an even more heated mesh, because the air temperature rises as it approaches the place of its entry into the device. Oil is transferred by the pump to the section farthest from the air inlet and flows over them towards the air.

Dust sticks to the oil film on the grid and falls into the bath when moving in a layer of oil.

Dust gradually settles to the bottom of the sections, from where it is periodically removed with the oil to the cleaning filter. For this, the bottoms of the bath sections are conical in shape, and pipes 5 with locking devices 6 connected to the collector 7 connected to the inlet of the oil filter 8 are connected to their lower part. By a pipe 9, the outlet pipe of the filter is connected to the inlet pipe of the oil pump 10. In addition to this has a control filter for cleaning oil 11, which is connected to the inlet pipe of the heater for preheating the supply air with oil 12. In the duct 13 for supplying air, the main heater for heating the air is installed a 14, heated by steam or water. During repairs, a shut-off device 15 is provided to shut off the heat recovery system.

The proposed continuous device for the preparation of air in air exchange systems allows you to utilize the heat of the exhaust air.

Claims (1)

A continuous device for preparing air in air exchange systems, including a housing with a chain conveyor inside it with spring grids, an air duct for supplying and discharging air, an oil bath, characterized in that the oil bath is divided by transverse partitions of variable height into sections with a conical bottom moreover, the partitions are made in such a way as to ensure the flow of oil from section to section towards the flow of exhaust air, and so that in the section adjacent to the inlet duct about ensure the lowest oil level, and in the section adjacent to the exhaust duct the highest, while the conical bottom of each section is equipped with a shut-off device through which oil passes into the manifold, connected through a filter device to the oil circulation system, including a pump, a filter control cleaning and a heater for preheating the supply air, which provides a counter-flow of oil-air and mesh-air, while the oil and mesh are moving in direct flow, and the main heater I preheat the air.

Images