Energy-saving and environment-friendly drying method and equipment with high efficient heat supply

Abstract

The application discloses a kind of high-efficiency heating energy-saving environment-friendly drying method and equipment, and the inner cavity of drying bin is provided with multiple groups of tubular heat exchange mechanism, each group of tubular heat exchange mechanism is provided with multiple layers of heat exchange pipe, each layer of tubular heat exchange pipe is composed of multiple diamond-shaped pipes arranged at intervals, the inlet of the uppermost layer of tubular heat exchange mechanism and the outlet of the lowermost layer of tubular heat exchange mechanism are respectively communicated with heating device, and the tubular heat exchange mechanism in the middle is connected at the head and tail to form a continuous return type heat medium flow channel;At least one layer of groove-shaped drying mechanism is arranged between the upper and lower adjacent two groups of tubular heat exchange mechanism, and the inlet and outlet of the groove-shaped drying mechanism are respectively communicated with heating device and condensing device.The application can realize three kinds of heat transfer forms to simultaneously heat granular materials efficiently, and the heat source carries heat gas circulation heating, the whole drying process is under negative pressure and closed, and the discharged high-humidity gas is washed and condensed to reach standard discharge without polluting the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to a material drying equipment, in particular to a high-efficiency heat supply energy-saving and environment-friendly drying method and equipment. BACKGROUND

[0002] At present, the traditional crop drying method mainly is: hot air passes through the crop particles to evaporate the moisture under normal pressure, but this drying method makes the crack rate of the crop high and easily destroys the inherent quality of the crop, and the energy consumption is high, the tunnel dryer using hot air for drying has a low heat energy utilization rate, only 30%-40%. The heat energy utilization rate of various drying equipment using indirect conduction and radiation combined heat supply is higher than that of the hot air convection dryer, at 60-80%, but the use of heat energy is only a simple one-time use, which wastes energy and has high energy consumption.

[0003] In addition, the drying process of wet granular material is a high-energy-consumption process of supplying heat to the granular material, and the heat supply is often only one or two heat transfer forms, which has low heat transfer efficiency and high energy consumption, and the discharged high-humidity gas contains many harmful components polluting the environment. SUMMARY

[0004] The present application solves the technical problems of overcoming the deficiencies of the prior art, and provides a high-efficiency heat supply energy-saving and environment-friendly drying method and equipment which has reasonable design, good heat transfer effect and reduces high-humidity gas emission.

[0005] The technical scheme of the present application is:

[0006] A high-efficiency heat supply energy-saving and environment-friendly drying equipment, comprising a drying bin, the upper end outlet of the drying bin is communicated with the discharge port of a material lifting machine through a wind lock, the lower end outlet of the drying bin is communicated with the feeding port of a discharge mechanism through another wind lock, the drying bin has a rectangular cuboid structure, at least two groups of tubular heat exchange mechanisms are arranged in the inner cavity of the drying bin, each group of tubular heat exchange mechanisms is provided with at least two layers of heat exchange pipes, each layer of tubular heat exchange pipes is composed of at least two rhombic pipes arranged at intervals, the inlet of the uppermost layer of tubular heat exchange mechanism is communicated with a heat supply device through a heat supply pipe, the outlet of the lowermost layer of tubular heat exchange mechanism is communicated with the heat supply device through a backflow pipe, the upper and lower adjacent tubular heat exchange mechanisms are connected in series to form a continuous return type heat medium flow channel, at least one layer of groove-shaped drying mechanisms is arranged between the upper and lower adjacent two groups of tubular heat exchange mechanisms, each groove-shaped drying mechanism is provided with at least one layer of angular pipes, each layer of angular pipes is composed of at least two angular pipes arranged at intervals, and the inlet and outlet of the groove-shaped drying mechanism are communicated with a heat supply device and a condensing device, respectively.

[0007] Further, a conical top is arranged at the upper end of the drying bin, and a non-powered distributor is arranged on the conical top; a conical bottom is arranged at the lower end of the drying bin.

[0008] Further, an electric hot air distribution valve is arranged on the return pipe, which divides the hot air into two branches, one of which returns to the heating device, and the other of which communicates with the inlet of the angular pipe as a heat source.

[0009] Further, the heating device comprises a natural gas burner, a combustion chamber, a heating fan and a heating pipe; and the condensing device comprises a water tank, a glass steel cooling tower and a condenser.

[0010] Further, the drying bin is of an integral structure or a split combined structure, and is composed of at least two bin segments, each of which is fixed together through a connecting piece, and each of which is provided with a corresponding tubular heat exchange mechanism and a groove-shaped drying mechanism, and the tubular heat exchange mechanisms and the groove-shaped drying mechanisms of the bin segments arranged above and below are connected one by one.

[0011] Further, an evacuation pipe is arranged on the drying bin, which communicates with a vacuum pump or an induced draft fan, so that the drying bin is kept in a negative pressure state.

[0012] An efficient heating energy-saving and environment-friendly drying method using the efficient heating energy-saving and environment-friendly drying equipment, characterized by comprising the following steps:

[0013] a. Start the heating device, and the hot air generated by combustion is transported into the heating pipe through the heating fan, then into the rhombic pipe of the tubular heat exchange mechanism of the uppermost layer, passes through the continuous return type heat medium flow channel, and finally flows into the return pipe from the rhombic pipe of the tubular heat exchange mechanism of the lowermost layer;

[0014] b. An electric hot air distribution valve is arranged on the return pipe, which divides the hot air into two branches, one of which returns to the heating device for continuous heating to increase the temperature of the hot air, and the other of which communicates with the inlet of the angular pipe of the tubular heat exchange mechanism as a heat source;

[0015] c. The saturated hot steam discharged from the angular pipe is discharged into the cooling device through the exhaust fan and the saturated water vapor discharge pipe, and after being cooled, the gas is discharged into the atmosphere;

[0016] d. The material enters the square drying bin through the material lifting machine and the air lock, and is gradually dried under the action of the radiation heat and the conduction heat of the rhombic pipe during the falling process in the square drying bin, falls to the opening at the lower end of the square drying bin, and is discharged through the serially connected air locks, thereby completing a drying process and achieving continuous drying;

[0017] e、According to the temperature of hot air, the opening and closing of the electric hot air distribution valve and the degree of opening and closing are determined, at the beginning, when the temperature is low, the electric hot air distribution valve is not started or is opened small, so that all or most of the hot air returns to the heating device for re-heating, in the middle of drying, the temperature of the discharged hot air is high, at this time, the electric hot air distribution valve is opened or opened large, the hot air is poured into the angular pipe, and the material is dried again, the saturated water vapor discharged from the angular pipe is cooled and discharged into the atmosphere, and the whole working cycle is completed.

[0018] Further, all the tubular heat exchange mechanisms are connected at the head and tail, and adopt a series structure for the return type hot air flow, or all the tubular heat exchange mechanisms are arranged in parallel, and adopt a parallel structure for the parallel type hot air flow.

[0019] Further, the cooling device includes a water tank, a glass steel cooling tower and a condenser, the discharged water vapor is cooled to reduce the temperature of the discharged gas, and after cooling, the gas is discharged into the atmosphere through the non-polluting waste gas outlet at the upper end of the condenser.

[0020] The beneficial effects of the present application are:

[0021] 1、The present application circulates the heat source carrier gas to the drying bin to supply heat to the rhombic tube in the drying bin, and the heat is radiated (penetrated) to the particulate material, conducted (indirectly) to the particulate material, and circulated to the particulate material to realize three forms of heat transfer at the same time.

[0022] 2、The drying bin of the present application is sealed under a certain negative pressure, and the high humidity gas generated in the process of drying cannot be discharged, thereby reducing heat loss and improving heat utilization rate.

[0023] 3、The present application adopts a circulating water return type circular condenser to wash and condense the discharged high humidity gas to reach the standard discharge without polluting the environment, and has good environmental protection effect.

[0024] 4、The present application has reasonable design, good heat transfer effect and reduced high humidity gas emission, wide application range, easy to implement, and good economic benefit compared with the traditional drying method. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the high-efficiency heat supply energy-saving and environment-friendly drying equipment. DETAILED DESCRIPTION

[0026] Example 1: see Figure 1, in which, 1-material lifting machine, 2-air lock, 3-unpowered distributor, 4-rhombic tube, 5-burner, 6-combustion chamber, 7-heating air fan, 8-heating tube, 9-electric heating air distribution valve, 10-secondary heating air distribution tube, 11-saturated water vapor discharge tube, 12-exhaust fan, 13-condenser, 14-non-polluting exhaust gas outlet, 15-water tank, 16-glass steel cooling tower.

[0027] The application discloses a high-efficiency energy-saving and environment-friendly drying equipment, which comprises a drying bin, wherein the upper end outlet of the drying bin is communicated with the discharge port of a material lifting machine 1 through an air lock 2, and the lower end outlet of the drying bin is communicated with the feeding port of a discharging mechanism through another air lock, and wherein the drying bin is in a cuboid structure (the end face is in a square shape), and at least two groups of tubular heat exchange mechanisms are arranged in the inner cavity of the drying bin, each group of the tubular heat exchange mechanisms is provided with at least two layers of heat exchange tubes, each layer of the tubular heat exchange tubes is composed of at least two rhombic tubes 4 arranged at intervals, and the rhombic tubes 4 of adjacent layers are arranged in a staggered mode, so that the materials present a broken line movement in the falling process, the contact probability with the rhombic tubes 4 is increased, the material formation is increased, and the drying efficiency and uniformity are further improved, the inlet of the uppermost layer of the tubular heat exchange mechanisms is communicated with a heating device through a heating tube 8, the outlet of the lowermost layer of the tubular heat exchange mechanisms is communicated with the heating device 8 through a backflow tube, and the tubular heat exchange mechanisms arranged at intervals are connected in series to form a continuous and back-and-forth heat medium flow channel, at least one layer of groove-shaped drying mechanisms is arranged between the two groups of the tubular heat exchange mechanisms arranged at intervals, each groove-shaped drying mechanism is provided with at least one layer of angle-shaped tubes, each layer of the angle-shaped tubes is composed of at least two angle-shaped tubes arranged at intervals, and the inlet and outlet of the groove-shaped drying mechanism are communicated with the heating device 8 and a condensing device respectively.

[0028] The upper end of the drying bin is provided with a conical top, and the conical top is provided with an unpowered distributor 3; the lower end of the drying bin is provided with a conical bottom. An electric heating air distribution valve 9 is arranged on the backflow tube, the electric heating air distribution valve 9 divides the hot air into two branches, one branch returns to the heating device 8 to continue heating, so that the temperature of the hot air is increased and the hot air is recycled, and the other branch is communicated with the inlet of the angle-shaped tube as a heat source, and a secondary heating air distribution tube 10 can be arranged in the middle to send the hot air to the angle-shaped tube. Of course, the groove-shaped drying mechanisms of different layers can be connected in series to form a combined structure of different layers, so that the hot air forms a back-and-forth route, and finally the hot air is discharged to the cooling device by an exhaust fan 12 and a saturated water vapor discharge tube 11.

[0029] The heating device comprises a natural gas burner 5, a combustion chamber 6, a heating air fan 7 and a heating tube 8; the hot air generated by the burner is transported into the heating tube 8 by the heating air fan 7, and then is introduced into the rhombic tube 4. The condensing device comprises a water tank 15, a glass steel cooling tower 16 and a condenser 13, and the discharged water vapor is cooled to reduce the temperature of the exhaust gas. After cooling, the gas is discharged into the atmosphere through the non-polluting exhaust gas outlet 14 at the upper end of the condenser 13.

[0030] The drying bin is of integral structure or of split combined structure, and is formed by at least two bin body segments (two segments in the figure, and of course, three segments, four segments or five segments, etc. can be provided according to requirements), each bin body segment is fixed together by a connecting piece, each bin body segment is provided with corresponding tubular heat exchange mechanism and groove-shaped drying mechanism respectively, the tubular heat exchange mechanism and the groove-shaped drying mechanism of the upper and lower adjacent bin body segments are connected one by one, and tubular drying and groove-shaped drying are respectively performed.

[0031] According to actual requirements, an exhaust pipe (of course, it can not be added) can be provided on the drying bin, the exhaust pipe is communicated with a vacuum pump or an induced draft fan (not shown in the figure), so that the drying bin is kept in a negative pressure state, and steam leakage is reduced. At present, the rhombic tube 4 and the angular tube are relatively common, and their fixing modes and specific structures are not described in detail. According to requirements, a discharging device can be provided at the lower part of the drying bin, and the material can be quickly and uniformly discharged.

[0032] In use, the heat supply device 8 is started, hot air is supplied into the rhombic tube 4, the material enters the square drying bin through the material lifting machine 1 and the air lock, and is gradually dried under the action of the radiation heat and the conduction heat of the rhombic tube 4 in the falling process in the square drying bin, falls to the opening at the lower end of the square drying bin, and is discharged through the connected air locks, so that one drying process is completed, and continuous drying can be achieved.

[0033] The opening and closing of the electric hot air distribution valve 9 and the size of the opening and closing are determined according to the temperature of the hot air. At the beginning, the temperature is low, the electric hot air distribution valve 9 is not started or is opened small, so that all or most of the hot air returns to the heat supply device for re-heating. In the middle of the drying, the temperature of the discharged hot air is high, so the electric hot air distribution valve 9 is opened or opened large, the hot air is poured into the angular tube, and the material is dried again. The saturated water vapor discharged from the angular tube is discharged into the atmosphere after being cooled, the whole working cycle is completed, and the tubular heat exchange mechanism adopts a parallel heat transfer mode.

[0034] Embodiment two: the embodiment two is basically the same as the embodiment one, and the same parts are not described again, and the different parts are that all the tubular heat exchange mechanisms are connected at the head and the tail, and adopt a series structure for a return type hot air flow.

[0035] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A high-efficiency energy-saving environment-friendly drying equipment, comprising a drying bin, an upper end outlet of the drying bin being communicated with a discharge port of a material lifting machine through a damper, and a lower end outlet of the drying bin being communicated with a feeding port of a discharging mechanism through another damper, characterized in that: The drying bin is a cuboid structure, and at least two groups of tubular heat exchange mechanisms are arranged in the inner cavity of the drying bin. Each group of tubular heat exchange mechanisms is provided with at least two layers of heat exchange pipes, each layer of tubular heat exchange pipe is composed of at least two rhombic pipes arranged at intervals, the inlet of the uppermost tubular heat exchange mechanism is communicated with the heat supply device through a heat supply pipe, the outlet of the lowermost tubular heat exchange mechanism is communicated with the heat supply device through a return pipe, and the tubular heat exchange mechanisms adjacent to each other in the middle are connected at the head and tail to form a continuous return type heat medium flow channel. At least one layer of groove-shaped drying mechanism is arranged between the two groups of tubular heat exchange mechanisms adjacent to each other in the up-down direction, each groove-shaped drying mechanism is provided with at least one layer of angular pipe, each layer of angular pipe is composed of at least two angular pipes arranged at intervals, and the inlet and outlet of the groove-shaped drying mechanism are communicated with the heat supply device and the condensing device respectively. ​ An electric hot air distribution valve is arranged on the return pipe, the electric hot air distribution valve divides the hot air into two branches, one branch returns to the heat supply device, and the other branch communicates with the inlet of the angular pipe as a heat source.

2. The energy-saving and environment-friendly drying equipment with high efficiency heat supply according to claim 1, characterized in that: A tapered top is arranged at the upper end of the drying bin, and a non-powered distributor is arranged on the tapered top.

3. The energy-saving, environment-friendly drying equipment with high heat supply efficiency according to claim 1, characterized in that: The heat supply device comprises a natural gas burner, a combustion chamber, a heat supply fan and a heat supply pipe; and the condensing device comprises a water tank, a glass steel cooling tower and a condenser.

4. The energy-saving, environmentally friendly drying apparatus according to claim 1, characterized in that: The drying bin is a monolithic structure or a split combined structure, and is composed of at least two bin body segments. The bin body segments are fixed together through connecting pieces, and the tubular heat exchange mechanisms and the groove-shaped drying mechanisms are arranged in each bin body segment respectively. The tubular heat exchange mechanisms and the groove-shaped drying mechanisms of the bin body segments adjacent to each other in the up-down direction are connected one by one.

5. The high-efficiency heat supply energy-saving and environment-friendly drying device according to any one of claims 1-4, characterized in that: The method comprises the following steps: a. Start the heat supply device, the hot air generated by combustion is transported into the heat supply pipe through the heat supply fan, then enters the rhombic pipes of the uppermost tubular heat exchange mechanism, passes through the continuous return type heat medium flow channel, and finally flows into the return pipe from the rhombic pipes of the lowermost tubular heat exchange mechanism; b. An electric hot air distribution valve is arranged on the return pipe, the electric hot air distribution valve divides the hot air into two branches, one branch returns to the heat supply device for continuous heating to improve the temperature of the hot air for recycling, and the other branch communicates with the inlet of the angular pipe of the tubular heat exchange mechanism as a heat source; c. The saturated hot steam discharged from the angular pipe is discharged into the cooling device through the exhaust fan and the saturated water vapor discharge pipe, and after being cooled, the gas is discharged into the atmosphere; d. The material enters the square drying bin through the material lifting machine and the air lock, and is gradually dried under the action of the radiation heat and the conduction heat of the rhombic pipes in the falling process in the square drying bin. The material falls to the opening at the lower end of the square drying bin, then is discharged through the serially connected air locks, and a drying process is completed, and continuous drying can be achieved. e、According to the temperature of hot air, the opening and closing of the electric hot air distribution valve and the degree of opening and closing are determined. When the temperature is low at the beginning, the valve is not started or is opened slightly, so that all or most of the hot air returns to the heating device for re-heating. In the middle of drying, the temperature of the discharged hot air is high, so the valve is opened or opened widely, the hot air is poured into the angular pipe, and the material is dried again. The saturated water vapor discharged from the angular pipe is cooled and then discharged into the atmosphere, completing the entire working cycle.

6. The energy-efficient, environmentally friendly drying method of claim 5, wherein: All the tubular heat exchange mechanisms are connected at the head and tail, and adopt a series structure for return type hot air flow, or all the tubular heat exchange mechanisms are arranged in parallel, and adopt a parallel structure for parallel type hot air flow.

7. The energy-saving, environmentally friendly drying method with high heat supply efficiency according to claim 5, characterized in that: The cooling device includes a water tank, a glass steel cooling tower and a condenser, which cools the discharged water vapor, reduces the temperature of the discharged gas, and after cooling, the gas is discharged into the atmosphere through the non-polluting waste gas outlet at the upper end of the condenser.

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