CN102288010B - Agricultural product drying machine with double functions of indirect and direct heating through hot air circulation - Google Patents

Abstract

The invention discloses an agricultural product drying machine with double functions of indirect and direct heating through hot air circulation. The drying machine consists of a combustion chamber, a high-temperature smoke pipe, a switching valve, a metal heat exchange pipe, a cold air inlet, a smoke discharge pipe, a smoke flow rate regulating valve, an air discharge fan, a humidity reducing flow rate regulating valve, a humidity reducing outlet, a circulation fan, a material plate, a heat exchange chamber and a heat-preservation shell; a hot air source part, a heat exchange part and a drying part are integrated; the metal heat exchange pipe is adopted for heat exchange, and simultaneously acts as a shelf for drying the material plate, and the drying residual heat is returned and recycled multiple times; the switching valve is installed on the high-temperature smoke pipe; when the switching valve switches to the indirect heating direction, the high-temperature smoke and cold air are in two passages, are not communicated mutually, and are used for indirect heating and drying; and when the switching valve switches to the direct heating direction, the high-temperature smoke and the cold air are connected into a passage so as to be used for direct heating and drying. The drying machine has the advantages of simple structure, small volume, convenience in switching of indirect and direct heating and high heat utilization efficiency.

Description

Hot air circulation directly heats dual-purpose crop drier indirectly

Technical field

The present invention relates to the air drier of the dry processing of agricultural product, particularly relate to a kind of hot air circulation and indirectly directly heat dual-purpose crop drier.

Background technology

The dry processing of agricultural product used drying machine at present, be characterized in the equipment complexity, weight is large, volume and investment are large, shift inconvenient, utilize coal-fired indirect thermal wind furnace or steam boiler to add heat exchanger and make hot air source, hot air source and drying machine are split type, the surface heat radiation of the high temperature heat source equipment machine utilization that can not be dried, system thermal efficiency is low, (being applicable to material is worth high without heating indirectly, the high occasion of quality requirements) (being applicable to material is worth low with direct flue gas, quality requirements is not high, the double-purpose functional that the occasion that the drying cost requirement is low) can conveniently switch, be not suitable for Hills, sparsely populated, planting scale is little, without the three-phase power electric, purchasing power is low, ungetable rural area, dry kind is restricted and overall economic efficiency is poor.

Summary of the invention

The purpose of this invention is to provide and a kind ofly can adapt to Hills rural area pluralities of fuel (coal, charcoal, stalk, the bavin standing grain), adopt the heat exchanger tube dispersed placement in drying machine, thermal radiation loss is few, the hot blast recycled for multiple times, efficiency of damp and hot exchanging is high, the small-sized crop drier that indirect and direct flue gas can conveniently switch, it can solve the deficiency of above-mentioned existence, the heat source part, heat exchange section and drying nest are integrated, adopt pipe type heat transfer, the heat exchanger tube while is as the shelf of material disc, low temperature exhaust heat wind returns repeatedly and utilizes, adopting transfer valve to control high-temperature flue gas flows to, when transfer valve switches to indirect, the air that high-temperature flue gas and drying medium are used is respectively two passages, not connected, realize the indirect dried material, when transfer valve switches to direct heating, high-temperature flue gas flows out the high temperature smoke pipe to be mixed with cold air, directly with material, contact and carry out drying, has device structure simple, volume is little, efficiency of utilization is high, can conveniently switch indirect and direct mode of heating, the advantage that the scope of application is wide.

The objective of the invention is to realize by following technical scheme: this hot air circulation indirectly directly heats dual-purpose crop drier and is comprised of combustion chamber, high temperature smoke pipe, transfer valve, metallic heat exchanging tube, cold wind import, smoke discharge tube, flue gas flow control valve, air exhauster, hydrofuge flow control valve, hydrofuge outlet, circulating fan, material disc, heat-exchanging chamber, insulation cladding.Be characterized in: high temperature smoke pipe two ends connect respectively the entrance point of combustor exit end and metallic heat exchanging tube, transfer valve is installed in the middle of the high temperature smoke pipe, the metallic heat exchanging tube while is as the shelf of material disc, breeder tube has been done in the material disc bottom, circulating fan is arranged in the drying machine insulation cladding, the outlet of smoke discharge tube connection metal heat exchanger tube, with the hydrofuge outlet, be connected, be connected to together the entrance point of air exhauster, sealing around metallic heat exchanging tube, form heat-exchanging chamber, insulation cladding is fixed on the outer surface of air drier, play insulation effect, fuel is after the internal combustion of combustion chamber, produce high-temperature flue gas, when transfer valve switches to indirect, high-temperature flue gas flows through the high temperature smoke pipe and enters in metallic heat exchanging tube and carry out convection current conduction heat release, flue gas after the heat release cooling is through smoke discharge tube, by air exhauster, discharged, cold air is under the air exhauster suction, by the air inlet of cold wind import by the heat-exchanging chamber bottom, enter the heat-exchanging chamber bottom, wash away metallic heat exchanging tube, carry out heat exchange, cold air is heated, material in while dried material dish, hot-air becomes and contains humid air, a part contains humid air and is discharged through air exhauster by the hydrofuge outlet on heat-exchanging chamber top, some contains humid air under the effect of circulating fan simultaneously, from heat-exchanging chamber side circulation port, flow into the circulating fan entrance point, under the circulating fan effect, flow into the heat-exchanging chamber bottom, continue dried material, the flue gas flow control valve is for regulating the size of flue gas discharge rate, temperature in fuel metering combustion intensity and drying machine, humidity and the discharge rate of hydrofuge flow control valve for regulating humid air, when transfer valve switches to direct heating, while closing simultaneously the flue gas flow control valve, high temperature air is after the transfer valve commutation, with cold air, mix, air inlet by the heat-exchanging chamber bottom flows into the heat-exchanging chamber bottom, material in material disc is carried out to heat drying, hot-air becomes and contains humid air, a part contains humid air and is discharged through air exhauster by the hydrofuge outlet on heat-exchanging chamber top, some contains humid air under the effect of circulating fan simultaneously, from heat-exchanging chamber side circulation port, flow into the circulating fan entrance point, at circulating fan, blow lower inflow heat-exchanging chamber bottom, continue dried material, humidity and the discharge rate of hydrofuge flow control valve for regulating humid air, regulate the temperature in drying machine.

Owing to having adopted technique scheme, hot air circulation indirectly directly heats dual-purpose crop drier and has realized indirectly or directly heating two kinds of mode dried materials, low temperature exhaust heat wind recycles, can conveniently switch indirect and direct mode of heating, device structure is simple, volume is little, cost of manufacture is low, efficiency of utilization is high, dry overall economic efficiency is good.

The accompanying drawing explanation

The invention will be further described below to engage drawings and Examples.

Fig. 1 is front view of the present invention.

Fig. 2 is A of the present invention-A cutaway view.

In figure: 1, combustion chamber, 2, the high temperature smoke pipe, 3, transfer valve, 4, metallic heat exchanging tube, 5, the cold wind import, 6, smoke discharge tube, 7, flue gas flow control valve, 8, air exhauster, 9, the hydrofuge flow control valve, 10, the hydrofuge outlet, 11, circulating fan, 12, material disc, 13, heat-exchanging chamber, 14, insulation cladding.

The specific embodiment

In embodiment as shown in Figure 1, Figure 2, hot air circulation indirectly directly heats dual-purpose crop drier and is comprised of combustion chamber 1, high temperature smoke pipe 2, transfer valve 3, metallic heat exchanging tube 4, cold wind import 5, smoke discharge tube 6, flue gas flow control valve 7, air exhauster 8, hydrofuge flow control valve 9, hydrofuge outlet 10, circulating fan 11, material disc 12, heat-exchanging chamber 13, insulation cladding 14.1 bottom, combustion chamber is the grate that the heat-resisting cast iron material is done, inwall is refractory brick, high temperature smoke pipe 2 use high temperature resistant steel plates are made, high temperature smoke pipe 2 connects respectively the entrance point of combustion chamber 1 port of export and metallic heat exchanging tube 4, transfer valve 3 is installed in the middle of high temperature smoke pipe 2, metallic heat exchanging tube 4 is made 6 rows, 6 of every rows, dispersed placement is in drying machine, be connected into heat exchanger channels, the long-pending caloric value with combustion chamber 1 of tube surface adapts, material disc 12 is placed on metallic heat exchanging tube 4, with stainless steel, make, it is netted that steel wire is made in bottom, be convenient to ventilate, the material uniform spreading that is dried is put in material disc 12, circulating fan 11 is arranged in the insulation cladding 14 of drying machine, the outlet of smoke discharge tube 6 connection metal heat exchanger tubes 4, with hydrofuge outlet 10, be connected, be connected to together the entrance point of air exhauster 8, sealing around metallic heat exchanging tube 4, form heat-exchanging chamber 13, in positive front, do openable door, for putting into and extract charging tray 12, insulation cladding 14 is fixed on the outer surface of air drier, the therebetween insulation material, play sealing and insulation effect, fuel is after 1 internal combustion of combustion chamber, produce high-temperature flue gas, when transfer valve 3 switches to indirect, high-temperature flue gas flows through high temperature smoke pipe 2 and carry out convection current conduction heat release in metallic heat exchanging tube 4, flue gas after temperature reduces is through smoke discharge tube 6, by air exhauster 8, discharged, cold air is under air exhauster 8 effects, by cold wind import 5, entered in drying machine, flow into the bottom of heat-exchanging chamber 13, wash away metallic heat exchanging tube 4, carry out heat exchange, cold air is heated, for the material in dried material dish 12, hot-air becomes and contains humid air, a part contains humid air and is discharged through air exhauster 8 by the hydrofuge outlet 10 on heat-exchanging chamber 13 tops, a part contains humid air under the effect of circulating fan 11, from the circulation port of heat-exchanging chamber 13 sides, flow into circulating fan 11 entrance points, through circulating fan 11, blow, flow into heat-exchanging chamber 13 bottoms, continue dried material, flue gas flow control valve 7 is be used to regulating the size of flue gas discharge rate, regulate the temperature in drying machine, the hydrofuge flow control valve is for regulating humidity and the discharge rate that contains humid air, when transfer valve 3 switches to direct heating, while closing simultaneously flue gas flow control valve 6, high temperature air flows into heat-exchanging chamber 13 bottoms through the direct heating outlet of transfer valve 3, with cold air, mix, material in material disc 12 is carried out to heat drying, hot-air becomes and contains humid air, a part contains humid air and is discharged through air exhauster 8 by the hydrofuge outlet 10 on heat-exchanging chamber 13 tops, a part contains humid air under the effect of circulating fan 11, from the circulation port of heat-exchanging chamber 13 sides, flow into circulating fan 11 entrance points, under circulating fan 11 blows, flow into heat-exchanging chamber 13 bottoms, continue dried material, hydrofuge flow control valve 9 contains humidity and the discharge rate of humid air for adjusting, regulate the temperature in drying machine.

Claims (4)

1. hot air circulation directly heats dual-purpose crop drier indirectly, by combustion chamber (1), high temperature smoke pipe (2), transfer valve (3), metallic heat exchanging tube (4), cold wind import (5), smoke discharge tube (6), flue gas flow control valve (7), air exhauster (8), hydrofuge flow control valve (9), hydrofuge outlet (10), circulating fan (11), material disc (12), heat-exchanging chamber (13), insulation cladding (14) forms, it is characterized in that: high temperature smoke pipe (2) two ends connect respectively the port of export of combustion chamber (1) and the entrance point of metallic heat exchanging tube (4), transfer valve (3) is installed in the middle of high temperature smoke pipe (2), transfer valve (3) is controlled the flow direction of high-temperature flue gas, when high-temperature flue gas flows into metallic heat exchanging tube (4), it is the indirect drying, when high-temperature flue gas flows into heat-exchanging chamber (13) bottom, it is direct drying, metallic heat exchanging tube (4) while is as the shelf of material disc (12), breeder tube has been done in material disc (12) bottom, circulating fan (11) is arranged in the insulation cladding (14) of drying machine, the outlet of smoke discharge tube (6) one end connection metal heat exchanger tubes (4), the other end is connected with hydrofuge outlet (10), again hydrofuge outlet (10) is connected to the entrance point of air exhauster (8), metallic heat exchanging tube (4) seals on every side, seal cavity forms heat-exchanging chamber (13), insulation cladding (14) is fixed on the outer surface of air drier.

2. hot air circulation according to claim 1 directly heats dual-purpose crop drier indirectly, and it is characterized in that: metallic heat exchanging tube (4) disperses to be positioned at the inside of air drier, and by 6～10 rows, 5～10 pipes of every row are connected into heat exchanger channels.

3. hot air circulation according to claim 1 directly heats dual-purpose crop drier indirectly, it is characterized in that: the top of heat-exchanging chamber (13) has hydrofuge outlet (10) to communicate with the entrance point of air exhauster (8), side has circulation port to communicate with the entrance point of circulating fan (11), and the direct heating outlet of the porose port of export, cold wind import (5) and the transfer valve (3) with circulating fan (11) in bottom communicates.

4. hot air circulation according to claim 1 directly heats dual-purpose crop drier indirectly, it is characterized in that: when indirect, flue gas flow control valve (7) is regulated the temperature of drying machine, hydrofuge flow control valve (9) is regulated humidity and the discharge rate that drying machine includes humid air, while directly heating, hydrofuge flow control valve (9) is regulated temperature, humidity and the discharge rate that drying machine includes humid air.

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