CN218915828U

CN218915828U - Waste heat collecting system of dryer

Info

Publication number: CN218915828U
Application number: CN202223236022.7U
Authority: CN
Inventors: 李正宓
Original assignee: Angela Energy Technology Guangzhou Co ltd; Guangdong Huiertai Biotechnology Co ltd
Current assignee: Angela Energy Technology Guangzhou Co ltd; Guangdong Huiertai Biotechnology Co ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-04-25
Anticipated expiration: 2032-12-01

Abstract

The application relates to a waste heat collection system of a dryer, which comprises an air inlet assembly, a heat exchange device and the dryer, wherein the heat exchange device is connected with the air inlet assembly and the dryer; the heat exchange device comprises a heat pipe, fins and a spraying assembly. When the waste heat collection system of the dryer is used, the heat pipe can exchange heat between the waste gas and the cold flow when the cold flow of the air inlet assembly and the waste gas discharged by the dryer flow through the heat exchange device, namely, the heat of the waste gas is transferred to the cold flow and is conducted to the dryer again, so that the effective utilization of the heat energy of the waste gas is realized; the exhaust gas of the drier can be provided with dust, and the spraying component cleans the dust in the heat exchange device, so that the surface of the heat pipe can be effectively prevented from being blocked by the dust, and the heat exchange effect of the waste heat collection system of the drier is ensured.

Description

Waste heat collecting system of dryer

Technical Field

The utility model relates to the technical field of heat transfer, in particular to a waste heat collection system of a dryer.

Background

The dryer refers to mechanical equipment for drying materials by utilizing heat energy and reducing the moisture of the materials.

The dryer can discharge a large amount of waste gas in the drying process, however, the heat in a large amount of waste gas is not generally utilized effectively, and energy waste is caused.

Disclosure of Invention

Based on the above, it is necessary to provide a waste heat collecting system of a dryer for solving the problem that the waste gas discharged from the conventional dryer is not effectively utilized, resulting in energy waste.

The waste heat collection system of the dryer comprises an air inlet assembly, a heat exchange device and the dryer, wherein the heat exchange device is connected between the air inlet assembly and the dryer; the heat exchange device comprises a heat pipe, fins and a spraying assembly, wherein the fins are arranged on the heat pipe, the heat pipe is used for exchanging heat, and the spraying assembly is arranged corresponding to the heat pipe and is used for spraying the fins.

In one embodiment, the heat exchange device comprises a cold cavity and a hot cavity, the cold cavity is used for being connected with an air inlet end of the dryer, the hot cavity is used for being connected with an air outlet end of the dryer, the heat pipe is connected between the cold cavity and the hot cavity for heat exchange, the spraying assembly is arranged in the hot cavity, and the spraying assembly is used for spraying and dedusting the hot cavity.

In one embodiment, the spray assembly comprises a water inlet end, a water outlet end and a spray calandria, wherein the spray calandria is communicated with the water inlet end, the spray calandria is positioned in the heat cavity, the spray calandria is arranged above the heat pipe, the water outlet end is used for discharging water and dust in the heat cavity, and the spray calandria is used for spraying the fins.

In one embodiment, more than one spray header is arranged on the spray calandria at intervals.

In one embodiment, the heat exchange device comprises a body and a support assembly, the cold cavity and the hot cavity are arranged in the body, the support assembly is connected with the bottom of the body, and the heat pipe is arranged in the body.

In one embodiment, the heat exchange device further comprises a partition plate installed in the body, and the partition plate divides the interior of the body into the cold cavity and the hot cavity.

In one embodiment, the heat exchange device comprises more than one heat pipe, the heat pipe is arranged in the body, and the heat pipe penetrates through the partition plate to be communicated with the cold cavity and the hot cavity.

In one embodiment, the support assembly comprises more than one support member, the more than one support members are arranged at intervals at the bottom of the body, the body is supported by the support members and inclined at a preset angle along the height direction of the body, and the water outlet end is arranged in the gravity concentration area of the body.

In one embodiment, the dryer waste heat collection system is further provided with a temperature-flow controller, and the temperature-flow controller is used for controlling the heat exchange intensity of the heat exchange device.

In one embodiment, the dryer waste heat collection system is further provided with a spraying timer, and the spraying timer is used for controlling the spraying frequency of the spraying assembly.

When the waste heat collection system of the dryer is used, the heat exchange device is connected with the air inlet assembly and the dryer, and when the cold flow of the air inlet assembly and the waste gas discharged by the dryer flow through the heat exchange device, the heat pipe in the heat exchange device can exchange heat between the waste gas and the cold flow, namely, the heat of the waste gas is transferred to the cold flow and is conducted to the dryer again, so that the effective utilization of the heat energy of the waste gas is realized, in addition, the heat pipe is provided with fins, the contact area of the heat pipe, the waste gas and the cold flow can be improved, the heat exchange quantity is increased, the preheating effect of the heat pipe on the cold flow entering the dryer is ensured, and the heat efficiency of the dryer is improved; the exhaust gas of the drier can be provided with dust, the dust can be distributed in the heat exchange device and attached to the surfaces of the fins, the spraying component can spray the fins, and the dust in the heat exchange device is cleaned, so that the surface of the heat pipe can be effectively prevented from being blocked by the dust, and the heat exchange effect of the waste heat collection system of the drier is ensured.

Drawings

FIG. 1 is a schematic diagram of a working flow of a dryer waste heat collection system according to an embodiment;

FIG. 2 is a schematic view of a heat exchange device according to an embodiment;

FIG. 3 isbase:Sub>A cross-sectional view ofbase:Sub>A portion A-A of the heat exchange device of FIG. 2;

FIG. 4 is a schematic view of a heat exchange device according to another embodiment;

10. a waste heat collection system of the dryer; 20. a cold chamber; 30. a thermal chamber; 100. a heat exchange device; 110. a body; 120. a partition plate; 130. a support assembly; 131. a support; 140. a heat pipe; 150. a spray assembly; 151. a water inlet end; 1511. a water inlet valve; 152. a water outlet end; 1521. a water outlet valve; 153. spraying a calandria; 1531. a spray header; 200. an air intake assembly; 300. a dryer; 310. an air inlet end; 320. an exhaust end; 330. a wet material tank; 340. a dry material tank; 400. and an exhaust assembly.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 and 2, in one embodiment, a dryer waste heat collection system 10 includes: the air inlet assembly 200, the heat exchange device 100 and the dryer 300, wherein the heat exchange device 100 is connected between the air inlet assembly 200 and the dryer 300; the heat exchange device 100 comprises a heat pipe 140, fins and a spraying assembly 150, wherein the fins are arranged on the heat pipe 140, the heat pipe 140 is used for exchanging heat, and the spraying assembly 150 is arranged corresponding to the heat pipe 140 and is used for spraying the fins.

When the above-mentioned waste heat collection system 10 of the dryer is used, the heat exchange device 100 is connected with the air inlet assembly 200 and the dryer 300, when the waste gas discharged from the dryer 300 and the cold flow passing through the heat exchange device 100, the heat pipe 140 in the heat exchange device 100 exchanges heat between the hot flow (the waste gas discharged from the dryer 300) and the cold flow, that is, the heat of the waste gas is transferred to the cold flow and is re-transferred to the dryer 300, so as to realize the effective utilization of the heat energy of the hot flow, in addition, the fins are arranged on the heat pipe 140, so that the contact area between the heat pipe 140 and the hot flow and the cold flow can be increased, the heat exchange amount is increased, the preheating effect of the heat pipe 140 on the cold flow entering the dryer 300 is ensured, and the heat efficiency of the dryer 300 is improved; the exhaust gas exhausted by the dryer 300 can be provided with dust, the dust can be distributed in the heat exchange device 100 and attached to the surfaces of the fins, the spraying component 150 can spray the fins, and the dust in the heat exchange device 100 is cleaned, so that the surface of the heat pipe 140 can be effectively prevented from being blocked by the dust, and the heat exchange effect of the waste heat collection system 10 of the dryer is ensured.

Note that, the heat pipe (heat pipe) technology related to the present application is invented by George grid Luo Fo (George Grover) of national laboratory of Los Alamos (Los Alamos) in 1963, so the principle of the heat pipe technology is not repeated in the present application. The application dryer waste heat collection system 10 is that the heat pipe equipment is applied to the dryer for gas-gas heat recovery, and the application dryer waste heat collection system 10 has the characteristics of small flow resistance, difficult blockage, convenient cleaning and the like, can completely avoid the disadvantages of the traditional heat exchange equipment, and also has the characteristic of high heat conductivity by utilizing heat pipe heat exchange, can reduce the temperature of exhaust gas exhausted by the dryer 300 to below the dew point, recover the potential energy released by the heat pipe heat exchange, and can achieve the effect of doubling the energy-saving benefit. The present dryer waste heat collection system 10 is therefore far superior to existing dryer systems.

Specifically, the air intake assembly 200 may be a blower for increasing the flow rate and pressure of the cold flow and continuously inputting the cold flow to the heat exchanging apparatus 100. After the waste gas is subjected to energy recovery through the heat exchange device 100, the waste gas is discharged out of the waste heat collection system 10 of the dryer through the exhaust assembly 400, and the exhaust assembly 10 can be a chimney, a smoke window or the like.

Referring to fig. 1, in some embodiments, the dryer 300 includes a wet material tank 330 and a dry material tank 340, and wet material is fed from the wet material tank 330 into the dryer 300, dried by the dryer 300, and then fed from the dry material tank 340.

As shown in connection with fig. 1 and 2, in some embodiments, the heat exchange device 100 includes: the cooling cavity 20 is connected with the air inlet end 310 of the dryer 300, the hot cavity 30 is connected with the air outlet end 320 of the dryer 300, the heat pipe 140 is connected between the cooling cavity 20 and the hot cavity 30 for heat exchange, the spray assembly 150 is arranged in the hot cavity 30, and the spray assembly 150 is used for spraying and dedusting the hot cavity 30. Specifically, a heat flow (for example, exhaust gas generated by the dryer 300) enters the hot chamber 30 from the exhaust end 320 of the dryer 300, the heat pipe 140 recovers heat from the heat flow in the hot chamber 30, and transfers the heat to the cold chamber 20 for release, so as to heat the cold flow flowing through the cold chamber 20, and the heat pipe 140 preheats the cold flow. Further, the heat flow discharged from the exhaust end 320 can have dust (the waste gas has dust) entering the heat cavity 30, the dust can be distributed in the heat cavity 30 and attached to the surface of the fins of the heat pipe 140, the spray assembly 150 can spray the heat cavity 30, and the dust in the heat cavity 30 is cleaned, so that the surface of the fins can be effectively prevented from being blocked by the dust, and the heat exchange effect of the waste heat collection system 10 of the dryer is ensured.

As shown in connection with fig. 2, in some embodiments, spray assembly 150 includes a water inlet end, a water outlet end, and a spray gauntlet, spray gauntlet 153 in communication with water inlet end 151, spray gauntlet 153 in thermal chamber 30, and spray gauntlet 153 above heat pipe 140, water outlet end 152 for draining water and dust in thermal chamber 30, spray gauntlet 153 for spraying fins. Specifically, the water inlet end 151 is communicated with the top of the body 110, the water outlet end 152 is communicated with the bottom of the body 110, the spray pipe 153 comprises more than one spray pipe, the spray pipes are communicated with the water inlet end 151, and the spray pipes are beneficial to spraying dust in an omnibearing manner, so that the spraying effect of the spraying assembly 150 is ensured.

As shown in connection with fig. 2, in one embodiment, one or more shower heads 1531 are spaced above the shower array 153. Specifically, the spray header 1531 is provided with spray small holes, and the pressure of the spray water column can be increased by setting small-sized holes, so that the spray assembly 150 can flush dust attached to the heat pipe 140 with larger force, the heat exchange effect of the waste heat collection system 10 of the dryer is guaranteed, further, the spray header 1531 is provided with an angle adjusting device (not shown), the spray angle of each spray header 1531 can be adjusted according to the actual situation that the dust is attached to the heat pipe 140, the spray water column can be aligned to the part attached by the dust, the spray effect of the spray assembly 150 is guaranteed, and the heat exchange effect of the waste heat collection system 10 of the dryer is guaranteed.

In another embodiment, according to the actual working requirement, the spray header 1531 is further provided with an atomization structure (not shown), and the atomization structure is used for enabling the spray header 1531 to spray mist, which is beneficial to cleaning dust in the hot cavity 30, enabling the dust to be deposited in the hot cavity 30 more quickly and discharged through the water outlet 152, reducing the influence of the dust on the heat exchange effect of the dryer waste heat collection system 10, and guaranteeing the heat exchange effect of the dryer waste heat collection system 10.

Referring to fig. 2 and 4, in some embodiments, the heat exchange device 100 includes a body 110 and a support assembly 130, the cold chamber 20 and the hot chamber 30 are disposed in the body 110, the support assembly 130 is connected to the bottom of the body 110, and the heat pipe 140 is disposed in the body 110. Specifically, the support assembly 130 may be detachably connected to the bottom of the body 110, or may also be welded, integrally formed, etc., and further, the support assembly may be a plurality of support columns or a plurality of support rods, etc., and the body 110 may be a frame body with two opposite openings or a cylinder body with two openings on the top surface.

In another embodiment, according to the actual working requirement, the support assembly 130 is detachably connected to the bottom of the body 110, so that the support assembly 130 with different lengths can be detached and assembled to facilitate the heat exchange device 100 to adapt to different height requirements.

As shown in connection with fig. 2, in some embodiments, a water inlet valve 1511 is provided on the water inlet end 151 and a water outlet valve 1521 is provided on the water outlet end 152. Specifically, the water inlet end and the water outlet end are water pipes, the water inlet valve 1511 is used for controlling the conduction of the water inlet channel and controlling the water inlet flow of the water inlet end 151, the water outlet valve 1521 is used for controlling the conduction of the water outlet channel, and the water outlet valve 1521 is provided with a sealing structure at the position of the water outlet end 152, which is beneficial to improving the sealing performance of the water outlet end 152 and preventing the water flow and dust from flowing out of the body 110 to cause environmental pollution.

Referring to fig. 2 and 4, in some embodiments, the heat exchange device 100 further includes a partition board 120, the partition board 120 is installed in the body 110, the partition board 120 divides the interior of the body 110 into a cold cavity 20 and a hot cavity 30, the heat exchange device 100 includes one or more heat pipes 140, the heat pipes 140 are installed in the body, and the heat pipes 140 pass through the partition board 120 to communicate the cold cavity 20 with the hot cavity 30.

Referring to fig. 2 and 4, in some embodiments, the supporting assembly 130 includes more than one supporting member 131, the more than one supporting member 131 is disposed at the bottom of the body 110 at intervals, the body 110 is inclined at a predetermined angle along the height direction of the body 110 under the support of the supporting member 131, and the water outlet 152 is disposed in the gravity concentration area of the body 110. Specifically, the water outlet end 152 is disposed in a gravity concentration area of the body 110, the gravity concentration area is located in an area relatively lower along an inclination direction of the body 110, so that water and dust in the hot cavity 30 flow and converge toward the same direction under the action of gravity, and further, a drainage effect of the waste heat collection system 10 of the dryer is guaranteed, further, the supporting pieces 131 are disposed at different heights, that is, along a direction far away from the gravity concentration area, the supporting pieces 131 sequentially connected with the bottom of the body 110 are disposed at the different heights from low to high, so that stability of the waste heat collection system 10 of the dryer placed on a platform is guaranteed, and further, the supporting pieces 131 can be supporting columns or supporting rods.

In some embodiments, dryer waste heat collection system 10 is also provided with a temperature-flow controller (not shown) for controlling the heat exchange intensity of heat pipes 140. Specifically, the temperature-flow controller can detect the temperature and flow parameters of the dryer 300, and then according to actual working requirements, by adjusting the heat exchange strength of the heat pipe 140, it is beneficial to ensure that the dryer waste heat collection system 10 achieves the optimal heat exchange effect, and further ensure that the dryer 300 achieves the optimal drying effect.

In some embodiments, dryer waste heat collection system 10 is also provided with a spray timer (not shown) for controlling the spray frequency of spray assembly 150. Specifically, according to the actual working requirement, the spraying timer can set the spraying frequency and the spraying time length each time, which is favorable for timely cleaning dust in the heat exchange device 100, further maintains the cleanliness of the heat pipe 140 and ensures the heat exchange effect of the dryer waste heat collection system 10.

In order to facilitate understanding of the economic benefits of the dryer waste heat collection system 10 of the present application, the energy saving effect produced by the present technology will be described below with three dryers 300 as examples, which bring economic benefits to enterprises.

The relevant technical parameters and energy-saving benefits are shown in the following table:

sequence number

Project

(Code)

Unit (B)

Parameters (parameters)

Remarks

1

Single machine exhaust flow

Vg

Nm ³ /h

12000

Totally three dryers

2

Exhaust inlet and outlet temperatures

Tgi/Tgx

℃

75/43.5

Dew point temperature: 45 DEG C

3

Exhaust temperature drop

ΔTg

℃

31.5

4

Exhaust heat development

Hgs

KW

136

5

Latent heat of exhaust

Hgl

KW

91.5

6

Total amount of exhaust waste heat

Hgo

KW

227.5

(6)＝(4)+(5)

7

Air intake heat recovery

Hao

KW

216

(7)＝(6)＊η

8

Single unit intake air flow

Va

Nm ³ /h

12000

9

Inlet and outlet temperature

Tai/Tax

℃

20/70

10

Temperature rise of intake air

ΔTa

℃

50

11

Single machine hour air-saving quantity

Snr

t/h

0.292

(11)＝(7)/Qo

12

System hour air-saving quantity

Sho

t/h

0.876

(12)＝(11)＊3

13

System hour energy saving benefit

Ph

Meta/time

245.3

(13)＝(12)＊Po

14

Annual energy saving benefit of system

Py

Meta/year

1839750

(14)＝(13)＊HR

In the table, η is the heat preservation efficiency of the heat exchange device 100, and here is 0.95; qo is the heat consumed per ton of saturated steam at a pressure of 0.8MPa, here 0.74KW; po is the price of 0.8MPa saturated steam, here 280 Yuan/ton; HR is the number of hours of 300 years of operation of the dryer, here 7500 hours.

Based on the above, the annual energy saving benefit of the system can reach 1839750 yuan, so that the economic benefit generated by adopting the waste heat collecting system 10 of the dryer is obvious.

In addition, when the exhaust gas of the dryer 300 is cooled to 1.5 ℃ below the dew point, the latent heat of 91.5KW can be obtained, and the sensible heat can be recovered and utilized by the dryer waste heat collection system 10, so that the system energy saving amount is increased from the original 136KW (sensible heat only) to 227.5KW (including sensible heat and latent heat), and the energy saving amount is obtained by the original energy saving amount= 227.5/136=1.67, and therefore, the system energy saving benefit is increased by 67%.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The waste heat collection system of the dryer is characterized by comprising an air inlet assembly, a heat exchange device and the dryer, wherein the heat exchange device is connected between the air inlet assembly and the dryer;

the heat exchange device comprises a heat pipe, fins and a spraying assembly, wherein the fins are arranged on the heat pipe, the heat pipe is used for exchanging heat, and the spraying assembly is arranged corresponding to the heat pipe and is used for spraying the fins.

2. The waste heat collection system of claim 1, wherein the heat exchange device comprises a cold chamber and a hot chamber, the cold chamber is used for being connected with an air inlet end of the dryer, the hot chamber is used for being connected with an air outlet end of the dryer, the heat pipe is connected between the cold chamber and the hot chamber for heat exchange, the spray assembly is arranged in the hot chamber, and the spray assembly is used for spraying and dedusting the hot chamber.

3. The dryer waste heat collection system of claim 2, wherein the spray assembly comprises a water inlet end, a water outlet end and a spray calandria, the spray calandria is communicated with the water inlet end, the spray calandria is located in the heat chamber, the spray calandria is located above the heat pipe, the water outlet end is used for discharging water and dust in the heat chamber, and the spray calandria is used for spraying the fins.

4. The waste heat collection system of claim 3, wherein more than one spray header is spaced apart on the spray gauntlet.

5. The waste heat collection system of claim 3, wherein the heat exchange device comprises a body and a support assembly, the cold chamber and the hot chamber are disposed in the body, the support assembly is connected with the bottom of the body, and the heat pipe is disposed in the body.

6. The dryer waste heat collection system of claim 5, wherein the heat exchange device further comprises a baffle plate mounted in the body, the baffle plate dividing the interior of the body into the cold chamber and the hot chamber.

7. The dryer waste heat collection system of claim 6, wherein the heat exchange device comprises more than one heat pipe, the heat pipe is arranged in the body, and the heat pipe passes through the partition plate to communicate the cold cavity with the hot cavity.

8. The waste heat collection system of claim 5, wherein the support assembly comprises more than one support member, wherein more than one support member is arranged at the bottom of the body at intervals, the body is inclined at a preset angle along the height direction of the body under the support of the support member, and the water outlet end is arranged in the gravity concentration area of the body.

9. The dryer waste heat collection system of any one of claims 2 to 8, further comprising a temperature-flow controller for controlling the heat exchange intensity of the heat exchange device.

10. The dryer waste heat collection system of any one of claims 2-8, further comprising a spray timer for controlling the spray frequency of the spray assembly.