CN201715905U

CN201715905U - Long-distance drying exhaust gas afterheat recovery system

Info

Publication number: CN201715905U
Application number: CN201020256795XU
Authority: CN
Inventors: 李选友; 耿文广; 张文克; 罗光亮; 高玲
Original assignee: Shandong Tianli Drying Equipment Co Ltd
Current assignee: Shandong Tianli Drying Co., Ltd.
Priority date: 2010-07-13
Filing date: 2010-07-13
Publication date: 2011-01-19
Anticipated expiration: 2020-07-13

Abstract

The utility model relates to a long-distance drying exhaust gas afterheat recovery system. The recovery system can effectively recover exhaust gas afterheat of a drier, and transmit heat to required nodes with lower energy consumption to preheat fresh air, and then the preheated fresh air returns to a drying system to dry material, to realize the reutilization of afterheat. The recovery system adopts the structure that the recovery system comprises a drying equipment exhaust gas heat source which is connected with at least one first-level oscillating flow heat pipe; the oscillating flow heat pipe heats a heat carrier in a long-distance conveying device; a plurality of second-level oscillating flow heat pipes used for acquiring heat are arranged on the long-distance conveying device; and a control device is simultaneously arranged on the long-distance conveying device.

Description

A kind of long-distance waste heat recovery system of drying tail gas

Technical field

The utility model relates to a kind of length apart from heat recovery technology, is particularly useful for the using waste heat from tail gas of drying machine, the long-distance waste heat recovery system of drying tail gas that utilizes again after long distance is carried.

Background technology

Nearly all industry at present all be unable to do without drying process, and drying is a sizable unit in the industrial consumption energy, and 14% of developed country's industrial consumption energy is used to drying, and the drying of some industry consumes energy even accounts for and produces 35% of power consumption.The tail gas of drying equipment carries a large amount of waste heats, therefore effectively utilizes the energy, reduces the adverse effect to environment, is the inexorable trend of drying operation innovation, development.

Dried tail gas waste heat in hot blast, the superheat steam drying technology reclaims the new drying medium of back heating, but the drying machine tail gas emission point in some dry run such as tunnel cave formula drying, the spray-drying reaches tens meters even rice up to a hundred with new wind access point distance, waste heat emission point and heat demand nodal distance are far away, because this drying process drying medium consumption is big, can reach 5 ~ 100,000 m as hot blast rate in some dry run ³/ h if adopt common waste heat reclaiming process, then need be provided with bulky pipeline induction system, and it is big that thermal medium wasted work amount is taken in conveying simultaneously, and some dry field condition is not suitable for installing the big large-scale pipeline induction system of this floor space especially; If adopt king-size oscillating flow heat pipe heat exchanger, heat transmission attenuation rate height, the heat exchanger steel quantity consumption is big, the initial cost height, so this part waste heat is fully reclaimed as yet.

Though this part waste heat taste is lower, but overall heat is very big, for further reducing dry power consumption, advance energy-saving and emission-reduction, realizing good recycling economy, adopt heat transmission equipment efficiently, good transmission technology, in this drying process waste heat recovery utilize again and be necessary.

The utility model content

The purpose of this utility model is exactly in order to address the above problem, the long-distance waste heat recovery system of drying tail gas that provides a kind of novel distance grown to carry, it can reclaim the drying machine tail gas waste heat effectively, and with lower energy consumption with heat delivery to the new wind of demand nodes preheating, new wind after preheating is got back to the drying system dried material, realizes that waste heat utilizes again.

For achieving the above object, the utility model adopts following technical scheme:

A kind of long-distance waste heat recovery system of drying tail gas, it comprises drying equipment tail gas thermal source, this thermal source is connected with at least one one-level oscillating flow heat pipe; This oscillating flow heat pipe heating is grown apart from the heat carrier in the conveying device, is provided with the secondary oscillating flow heat pipe that several are used to obtain heat energy on growing apart from conveying device; With duration apart from then being provided with control device on the conveying device.

Described length comprises circulating pump apart from conveying device, and its end is connected with expansion slot, and the other end then is connected with long-distance transmission pipeline, is provided with control device on long-distance transmission pipeline.

Described control device comprises one group of valve and one group of sensor; Wherein the one-level oscillating flow heat pipe is in parallel with control valve IV, is provided with a temperature sensor on the long-distance transmission pipeline of one-level oscillating flow heat pipe outlet; On the long-distance transmission pipeline at pump entry place, be provided with control valve I, control valve I and the control valve II that connects, bypass strainer and control valve III parallel connection, this place also is provided with a temperature sensor simultaneously.

The evaporator section of described one-level oscillating flow heat pipe is connected with thermal source, and condensation segment is connected with heat carrier, is the adiabatic section between evaporator section and condensation segment.

The evaporator section of described secondary oscillating flow heat pipe is connected with the new wind that needs heating; Condensation segment is connected with heat carrier, is the adiabatic section between evaporator section and condensation segment.

The utility model is provided with an oscillating flow heat pipe heat exchanger at waste heat emission point place, the flow through evaporator section of oscillating flow heat pipe heat exchanger of drying machine tail gas, the exchanger heat intraductal working medium conducts heat by pulsation heat is transferred to condensation segment, the conduction oil condensation segment of under the effect of pump merit, flowing through, conduction oil absorbs heat, temperature increase; Under the circulating pump effect, the long distance of conduction oil is delivered to the heat demand node place in the process system; And then through secondary oscillating flow heat pipe heat exchanger, conduction oil enters the evaporator section of heat exchanger, and heat discharges the back by the new wind medium recurrence drying system of pulsating heat pipe with the heat transferred condensation side, and waste heat obtains cycling and reutilization in native system.

Advantage of the present utility model is, system flexibly, little, the heat length of taking up room is apart from less energy consumption in the course of conveying, heat loss is little, is specially adapted to that hot blast consumptions such as spray-drying or tunnel cave formula drying are big, drying machine tail gas emission point and new wind medium access point distance drying process far away.Adopt this novel length apart from the conveying-type waste heat reclaiming process, can reduce to lay in the common exhaust heat recovering method drawback of bulky fresh air pipeline system, reduce the electric energy that long distance carries new wind to consume, reduce the heat loss in the heat delivery process.Oscillating flow heat pipe exchanger heat efficient height, all temperature characteristics is good, the heat transfer direction is reversible, volume is little, thermal response rapidly but also have easy for installation, easy to maintenance, long service life, drag losses little, advance the air draft runner and advantage such as be convenient to separate, do not leak through with each other; Conduction oil is a kind of transmission medium of heat, has homogeneous heating, temperature adjustment control temperature accurately, can produce high temperature under low-steam pressure, heat-transfer effect is good, and is nonflammable, thermal capacity is big, carry advantages such as energy-conservation, easy to operate, can in wideer temperature range, satisfy the process requirements of different temperatures heating, cooling.

Description of drawings

Fig. 1 utilizes a kind of process chart of growing apart from heat recovery.

Among Fig. 1: 1-evaporator section, 2-adiabatic section, 3-condensation segment, 4-circulating pump, 5-control valve I, 6-control valve II, 7-control valve III, 8-bypass strainer, 9-temperature sensor, 10-control valve IV, 11-expansion slot, 12. one-level oscillating flow heat pipes, 13. secondary oscillating flow heat pipes.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described further.

At first the flow through evaporator section 1 of one-level oscillating flow heat pipe 12 of the waste heat of drying machine tail gas, heat is passed to the condensation segment 3 of adiabatic section 2 other ends by pulsating heat pipe, flow out the exhaust gas evacuation of evaporator section, the heat pipe of evaporator section 3 is with the heat transferred conduction oil, after heating up, conduction oil under the effect of circulating pump 4, is delivered to the evaporator section 1 of secondary oscillating flow heat pipe 13 through long distance, the conduction oil release heat is passed to the condensation segment 3 of secondary oscillating flow heat pipe 13 by pulsating heat pipe, the heat pipe of condensation segment 3 is with the new wind of heat transferred, new wind after the heating returns drying process, realizes that in native system waste heat recovery utilizes again.

In the heat distance transmission system, heat carrier adopts conduction oil, and control valve II 6 and control valve III7 close during the system operate as normal, and control valve I 5 opens; Regular closed control valve I 5, opening controlling valve II 6 and control valve III 7, conduction oil is by bypass line, 8 pairs of conduction oil filter cleanings of bypass strainer; Be provided with temperature sensor 9 in the transmission system, monitor the oil temperature that one-level oscillating flow heat pipe 12 is imported and exported in real time, when oily temperature exceeded limit value, opening controlling valve IV 10 a part of conduction oils circulated by bypass line; During normal the operation, the conduction oil liquid level of expansion slot 11 should remain on about 2/3 to 3/4.

Should start circulating pump 4 earlier during driving; Stop heating during parking earlier, 4 operations of circulating pump just can stop circulating pump 4 when the conduction oil temperature drops to below 100 ℃.

Claims

1. a long-distance waste heat recovery system of drying tail gas is characterized in that, it comprises drying equipment tail gas thermal source, and this thermal source is connected with at least one one-level oscillating flow heat pipe; This oscillating flow heat pipe heating is grown apart from the heat carrier in the conveying device, is provided with the secondary oscillating flow heat pipe that several are used to obtain heat energy on growing apart from conveying device; With duration apart from then being provided with control device on the conveying device.

2. long-distance waste heat recovery system of drying tail gas as claimed in claim 1, it is characterized in that described length comprises circulating pump apart from conveying device, its end is connected with expansion slot, the other end then is connected with long-distance transmission pipeline, is provided with control device on long-distance transmission pipeline.

3. long-distance waste heat recovery system of drying tail gas as claimed in claim 1 or 2 is characterized in that, described control device comprises one group of valve and one group of sensor; Wherein the one-level oscillating flow heat pipe is in parallel with control valve IV, is provided with a temperature sensor on the long-distance transmission pipeline of one-level oscillating flow heat pipe outlet; On the long-distance transmission pipeline at pump entry place, be provided with control valve I, control valve I and the control valve II that connects, bypass strainer and control valve III parallel connection, this place also is provided with a temperature sensor simultaneously.

4. long-distance waste heat recovery system of drying tail gas as claimed in claim 1 is characterized in that the evaporator section of described one-level oscillating flow heat pipe is connected with thermal source, and condensation segment is connected with heat carrier, is the adiabatic section between evaporator section and condensation segment.

5. long-distance waste heat recovery system of drying tail gas as claimed in claim 1 is characterized in that, the evaporator section of described secondary oscillating flow heat pipe is connected with the new wind that needs heating; Condensation segment is connected with heat carrier, is the adiabatic section between evaporator section and condensation segment.