JPH0359209A - Method and apparatus for drying road - Google Patents

Abstract

PURPOSE: To dry the ground by mixing the heated exhaust gas current and the cold new air current at a center of a heat mixing device, blowing the same onto the ground at a high speed, and making the current stay near the ground for a long time by the self-sucking action. CONSTITUTION: A heat mixing device 2 is mounted on a loading vehicle 1. An air blower 3 is mounted in a feed socket pipe 4 at a center of a coated pipe 28 of the heat mixing device. Then the new air current 30 flows into the heat mixing device 2 from an oblique lower part through the air blower 3 and the feed socket pipe 4. A burner 7 is flanged at one side and a hot air nozzle 15 is flanged at the other side with respect to a center of the mixing device 2. A combustion chamber head 26 of a combustion chamber pipe 10 is joined to a diffuser 11. Further the new air current 30 is accelerated by a ring clearance between a necking of the coated pipe 28 and a conical part of the combustion chamber head 27, and the negative pressure necessary for the suction of the combustion gas 31 is supplied.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for drying, defrosting, and thickening roads, landing strips, and construction sites by using warm air with a wide airflow of high velocity and temperature. METHODS AND APPARATUS.

PRIOR ART It is known to heat the ground in the open air by the addition of chemicals or by means of radiators.

[Problem to be Solved by the Invention] This method has the disadvantage that the environment is contaminated with additives or that the use of none for drying or heating tasks is of little effect.

It has no transport effect on interfering substances such as moisture or snow. Because the increasingly effective and efficient machinery of road construction, and the increasingly high workload of airports, require highly effective treatment of the ground.

The ground must be dried, thawed, or heated in a short period of time.

Objects and Means of the Invention The present invention relates to a method and apparatus for drying, heating and thawing outdoor ground using a mobile hot air blower, from which hot air is delivered by special nozzles at high velocity and adjustable temperature. This is produced by an oil or gas blast burner and mixed proportionately with fresh air for temperature regulation.

[How it works] Surprisingly, it has been discovered that a wide, high-speed stream of warm air that blows flat on the ground has a surprising effect.
Warm air is drawn from the ground due to the suction effect formed at the ground level by the velocity difference between the solid ground and the rapidly flowing air, keeping the broad warm air flow above the ground for a relatively long period of time or residence length. The flow is extremely long and the heat contained in the warm air flowing out at high speed is transferred with high efficiency to heat the underground, and this flow is also used to remove excess moisture, snow, etc. This effect is further enhanced if the exiting flow is stabilized by focusing in a flat Venturi tube.
strengthened.

This surprising physical effect leads to a method and apparatus that optimally meets the task of heating the subgrade by means of warm air flowing out at high velocity from a flat, wide nozzle.

[Example 1] Figures 1 through 13 show the method according to the invention, the device mounted on a loading vehicle, and the device separately as individual parts diagrams.

1 indicates a vehicle loaded with warm air nozzles. Warm air is produced by a warm air mixing device 2. For this purpose, a blower 3 is arranged in the supply socket pipe 4 in the center of the cladding 28 of the warm air mixing device 2. The adjustment of the alternating airflow by the blower 3 is carried out either by a throttle valve 6 following the blower 3 or by the blower 3, whose airflow can be varied by changing the rotational speed or the blade position. The interrupted air flow 30 is connected to the blower 3 and the supply socket pipe 4
The air flows into the warm air mixing device 2 from diagonally below. The center of the warm air mixing device 2 is flanged with a burner 7 on one side and a hot air nozzle 15 on the other side. A combustion chamber tube 10 is arranged on the burner side in the warm air mixing device 2 , and its combustion chamber head 26 joins the diffuser pipe 1 . The combustion chamber tube 10 has a burner tube 8 of a blower burner 7 projecting into it, on the one hand, in which the flame from the burner 7 burns in a controllable manner, and on the other hand, fresh air 30 flowing around the combustion tube 10. Allow it to be preheated after blower 3. At the end of the combustion chamber tube 10 is a combustion chamber head 26.
, which can be moved axially over the combustion chamber tube 10 through an adjustment device 25 . Combustion chamber head 26
is adjusted through the regulating device 25, so that the annular gap created between the waist of the cladding tube 28 and the conical part of the combustion chamber head 27 becomes a cross-section, which accelerates the alternating airflow 30 and causes the end of the combustion chamber head 30 to The negative pressure necessary for sucking out the combustion gas 31 from the combustion chamber pipe O is supplied. After the combustion chamber head 26, the exhaust gas stream from the combustion of gas and kerosene 31 is mixed with a preheated interchanging air stream 30 in the diffuser 11 and in the mixing chamber 12 following the hot air nozzle 5 to form a mixed air stream 32. The hot air nozzle 15 following the mixing top 2 passes into a wide discharge nozzle 6, as shown in detail in FIG. This nozzle comprises an inlet 17 which subsequently has thin plates 918 running parallel to each other and an enlarged section 21 whose opening angle is less than 6 degrees. For guiding the hot air nozzle 15, a hydraulic cylinder of a lifting gear M2, which may consist of a cable, is attached to the warm air mixing device 2, and a running roller 20 is attached to the hot air nozzle 15.

At the top of the hot air nozzle 15 is a temperature sensor 14, which is connected to the servo motor 13 through a regulator 23.

Depending on the choice of intended use, the configuration and outflow angle for the hot air nozzle on the ground can vary.

4 to 12 illustrate various possible embodiments of nozzle configurations. In Fig. 1, a plurality of hot air nozzles are combined into one large nozzle unit through a connecting pipe 37. In FIG. 12, the burner tube comes out further forward and fits into the rectangular nozzle outlet, thereby moving the mixing zone of both gas streams behind the nozzle. 1st
Figure -3 shows a nozzle configuration in which the temperature reduction of the gas stream takes place through the emissive layer 36.

A special example explains the particularities of the method according to the invention in more detail.

To dry the wet roads, heavy vehicles are used to dry roads for subsequent road construction work. It consists of a loading vehicle 1 and a hot air mixing device 2 fixedly attached to one of the vehicles, which is equipped with hot air nozzles as can be seen in FIG.

An axial blower 3 is started with a ventilation output of approximately 9000 m3/h. At this time, the fresh air 30 sucked in at about 10 degrees first flows through the blower 3, through the supply socket pipe 4, and into the local station 6.

After starting the axial blower 3, the oil blower burner 7 is activated. This has a maximum output of 806kw. Approximately 66
．． The oil flow of 8 kg/h is combusted together with approximately 10,000 cubic m/h of combustion gas 35 taken in through the blower 9, and the combustion chamber pipe 10 produces a flow of 1,000 cubic m i N.
/ h of the exhaust gas flow 31. Oil blower burner 7
has a pressure loss of about 2000 PA, and the combustion chamber head 26
At the end of , this pressure is eliminated, so there is no longer an overpressure at this location.

The combustion chamber tubes 10 and the combustion chamber head 26 are cooled by the intensive interchanging airflow 3o in the local station 6 of the warm air mixing device 2. In order that the high pressure of about 3500 PA in the current station does not extinguish the flame in the combustion chamber tube 10, the breaking air flow 30 is accelerated by the constriction 29 of the cladding tube 28 to about 85 m/s. This converts a lot of pressure energy into velocity, which creates a negative pressure at the end of the combustion chamber head 26.

At the beginning of the hot air nozzle 15, the flow space in the mixing chamber 12 is enlarged in steps. This amplifies the turbulence, and the interrupted airflow 30 mixes with the exhaust gas flow 31, resulting in a catch of 1,000.
This results in a mixed air flow 32 of approximately 300 degrees of cubic m/h.

With a speed of approximately 60 m/s and an entry angle of approximately 10 degrees, the air mixture stream 32 flows from the outlet nozzle 16 onto the wet road surface. This flow then creates a negative pressure directed towards the road, which prevents the warm air flow from extending over a length of approximately 5 m in the direction of travel and 0.4 m above the roadway level. Due to this effect, the thermal energy present in the air mixture stream 32 is transferred with great efficiency to the required drying process.

Further examples are intended to explain the method according to the invention in more detail.

A warm air mixing device 2, shown in side view in FIG. 3, is used to dry the damp pavement for subsequent operations.

Axial blower 3 with intermittent airflow of approximately 1500 m3/h
starts. At this time, the cut-off air taken in at about 10 degrees passes through the blower and the supply socket pipe 4 and flows into the local station 6 of the warm air mixing device.

After starting the axial blower 3, the oil blower burner 7 is activated. This has a maximum output of 200kW. Approximately 1
Oil flow of 6.7jcg/h is approximately 270kg/
About 236 cubic m i N
/ h of exhaust gas flow. The oil blower burner 7 has a pressure loss of about 600 Pa.

An air flow of 1500 m3/h flows around the combustion chamber tube and cools it in the ring chamber area 6. In the lower region of the warm air mixer, the air flow is directed upwards and extends approximately 30 m
/s exits the warm air mixer 2 via the discharge nozzle. The high exit velocity creates a negative pressure behind the nozzle, which sucks the hot exhaust gases out of the combustion chamber tube 10.

Both gas streams mix and simultaneously create a negative pressure towards the road due to the high velocity of approximately 20 m/s flowing over the road surface up to 5 m after the exit nozzle. The turbulent warm air flow is about 4 m
Dry the sidewalk at a working speed of / min in.

Further examples are intended to explain the device according to the invention in more detail.

Air is sucked in by an axial blower 3 with a total length of L OOOm m and a diameter of 500 mm and introduced centrally at an angle of 40 degrees into the local station 6 of the hot air mixing device 2 through a supply socket pipe 4 of the same diameter. do. The current station 6 has an outer diameter of 50 C) mm, an inner diameter of 280 mm and a length of about 920 mm. The FIl tube 28 has a length of 85 mm and constricts from a diameter of 500 mm to a diameter of 350 mm.

After this, the cladding tube 28 expands again in the form of a diffuser at an angle of 6 degrees over a length of 500 mm.

At the center of the warm air mixer 2 is a combustion chamber tube 10 .

It has a diameter of 280 mm and a length of approximately 500 mm. A combustion chamber head extends above the combustion chamber tube 10, which widens at its end into a conical shape with a diameter of 350 mm. This enlarged section has a length of approximately 100 mm.
, a tube section 34 with a diameter of 350 mm is connected.

A hot air nozzle 5 is installed in the diffuser 11 of the warm air mixing device 2.
is flanged. It initially has a square cross section with a side length of 460 mm in the mixing chamber. Thereafter, it expands to 2500 mm with the same shape and narrows to a height of 20 mm before entering the discharge nozzle 16. The discharge nozzle 16 initially comprises two parallel thin plates over a length of 100 mm, which are spaced apart by 20 mm. It is then expanded at an angle of 6 degrees over a length of 50 mm.

The discharge nozzle 16 is bent at about 25 degrees at the lower end of the hot air nozzle 15.

Further examples are intended to explain in more detail the particularities of the device according to the invention.

It is arranged at the center below the loading vehicle 1. Total length 480
By means of an axial blower with a diameter of 250 mm, ambient air is sucked in and directed through the supply socket pipe 4 into the central warm air mixing device 2.

The warm air mixing bag N2 has upper dimensions of 500x400x400, in which the intake air flows around a combustion chamber tube 10 with a diameter of 200 mm. In the lower part of the warm air mixer, the round combustion chamber tube also has dimensions 800x20 and length 2
00 mm rectangular pipe. Above the exhaust gas pipe is a pipe for fresh air, which also has dimensions 8
00x20. The length is 200 mm. At the exit of each conduit, this is expanded by 6 degrees. The warm air mixing device is
It is mounted on top of the loaded vehicle so as to form a 45 degree angle with the ground.

[Brief explanation of drawings]

1 to 13 show the method according to the invention, the device on board a loading vehicle and separately as individual parts diagrams. 1 is a loading vehicle, 2 is a warm air mixing device, 3 is an axial blower,
4 is a fresh air supply socket pipe, 5 is a throttle valve, 7 is a blower burner, 10 is a combustion chamber pipe, 11 is a diffuser,
12 is a mixing chamber, 14 is a temperature measuring device, 15 is a hot air nozzle, 16 is a discharge nozzle, 9 is a vertical movement device, 20 is a running roller, 23 is a regulator, 24 is an inversion/rotation device, 25 is a combustion chamber head adjustment device , 28 is the cladding tube, 29 is the constriction, 30
31 is exhaust gas, and 32 is crystal apneumatic flow. Procedural amendment pot (method) 1. Description of the case Japanese Patent Application No. 1-196469 2, title of the invention Road drying method and device 3, person making the amendment Relationship to the case Patent applicant address Schulstrasse, Dei-8602 Buttenheim, West Germany 8 Name Christian Kotcho Nationality: West Germany 4, Agent address: 5-7-14-509 Nishinakajima, Yodoyou-ku, Osaka (
1) Drawings (2) Power of attorney

Claims (1)

[Claims] 1. A method for drying, heating, thawing and cleaning outdoor ground by means of warm air, comprising a heated exhaust gas stream (31) at a slight pressure in the center of a warm air mixing device (2); is mixed with a concentrated cold fresh air stream (30), the relatively high pressure of the fresh air stream being converted into a slight negative pressure by a regulated velocity increase,
The hot exhaust gases (31) are sucked out, which allows good combustion in the combustion chamber tube (10), and this mixed air stream (32) is tilted at high velocity and spread over a wide surface. A method of drying roads, which is characterized in that it is sprayed onto the ground in the field and remains close to the ground for a long time due to a self-inhalation effect. 2. Process according to claim 1, characterized in that the heated gas stream (31) is produced by a gas burner or an oil burner, preferably an oil burner. 3. 500 to 40 in front of the constriction (29) of the cladding tube (28) of the warm air mixer (2) of the concentrated fresh air flow (30)
It has a pressure between 00Pa and this is the axial blower (3)
The method according to claim 1, characterized in that it is made by. 4. Fresh air flow through the constriction (29) of the cladding tube (28) (
The acceleration of 30) from 60 to 120 m/s creates a local negative pressure that sucks out the hot exhaust gas stream (31) from the combustion chamber tube (10) and the combustion chamber head (26). A method according to claims 1 and 3, characterized in that: 5. The optimum combustion ratio in the combustion chamber tube (10) is determined by the adjustment device (
By setting the negative pressure by 25), the combustion head (26)
Method 6 according to claims 1 and 4, characterized in that the regulating device changes the ring gap for the cold air at the end of the combustion tube, by changing the flow velocity of the mixture flow (32). Hot air nozzle (15) from warm air mixing device (2)
During the stepwise transition to, an additional turbulent flow is created, which is characterized in that it mixes the fresh air flow (30) and the exhaust gas flow (31) into a homogeneous mixed flow (32). The method according to claim 1. 7. The air mixture flow (32) has a speed of 30 to 60 m/s,
It also flows out of the outflow nozzle (16) with a spray angle of 5 to 30 degrees and flows over the field ground, where the jet stays in a ground area with a length of 3 to 5 m and a height of about 0.4 m due to the self-inhalation effect. Method according to claims 1 and 6, characterized in that. 8. The air mixture flow (32) has a speed of 30 to 60 m/s,
characterized by being directed onto the field ground with a spray angle of 45 to 85 degrees, thus cleaning particles from the ground;
The method according to claim 1. 9. Method according to claim 1, characterized in that the warm air mixing device (2) on the loading vehicle (1) can be swiveled by at least 90 degrees. 10. Temperature adjustment of the mixed air flow (32) is performed using the new air flow (30
), by changing the valve position by means of a throttle valve (5) located after the axial blower (3), or by blower-specific devices such as speed changes or blade angle adjustments, or by adjusting the burner 2. Process according to claim 1, characterized in that it is carried out by a multistage operation of (7) and that the temperature range of the mixed gas stream (32) is between 80 and 350<0>C. 11. Method according to claim 1, characterized in that the redrying of the field ground is carried out through a radiant surface (36). 12. The transport device (11) carries a hot air mixing device (2), which is equipped with a blower burner (7) in the center and on one side, and the hot air mixing device is equipped with a cladding tube (28), an axial blower (
3), a fresh air supply socket pipe (4), a combustion chamber pipe (1)
0), combustion chamber head (26), combustion chamber head adjustment device (
25), tipping and rotation device (24), vertical movement device (1
9), a constriction (29) and a diffuser (11), the diffuser has a warm air nozzle (15) through the flange, which is connected to the diffuser (11) at the connection point.
11) Road drying device for carrying out the above method, characterized in that it has a larger cross-sectional area and is equipped with running rollers (20) and discharge nozzles (16). 13. Device according to claim 12, characterized in that the warm air mixing device (2) can rest on the transport vehicle laterally (FIG. 2) or centrally (FIG. 3). 14. Air supply socket pipe (4) for fresh air (30)
13. Device according to claim 12, characterized in that the hot air mixing device (2) rests at an angle of 20 to 70 degrees. 15. The warm air mixing device (2) is characterized in that it has a combustion chamber tube (10) in the middle, at one end of which rests the blast burner (7) and at the other end a combustion chamber tube head (26), 13. Apparatus according to claim 12. 16. Claim characterized in that the combustion chamber tube head (26) consists of a tube (33), a conical enlargement (27) connected to it and a straight tube section (34) connected to it The device according to paragraphs 12 and 15. 17. Device according to claim 12, characterized in that the cladding tube (28) of the warm air mixing device (2) is constricted at an angle of 30 to 60 degrees. 18. Device according to claims 12 and 15, characterized in that, after the constriction (29), the cladding tube (28) widens again at an angle of less than 6 degrees. 19. The combustion chamber head (26) is constricted by 100 mm or more (
2) and the diffuser (11) of the warm air mixing device (2).
17. The device according to claims 12 and 16, characterized in that it protrudes into the. 20. According to claim 12, characterized in that the cross-sectional area of the mixing chamber (12) of the hot air nozzle (15) is 50% to 150% larger than the exit area of the diffuser (11) of the hot air mixing device (2). The device described. 21. The hot air nozzle (15) comprises a discharge nozzle (16), which has a parallel running part (18) with a length of 100 to 150 mm and a part (21) with a length of 50 to 100 mm and which widens by 6 degrees. 13. Device according to claim 12, characterized in that it consists of: 22. Device according to claim 21, characterized in that the discharge nozzle (16) is bent from the hot air nozzle at an angle between 15 and 40 degrees. 23. characterized in that the lifting device (19) can be a hydraulic cylinder or an electric or manual cable polygon device or a rod that can be actuated electrically or manually;
13. Apparatus according to claim 12. 24. Temperature measuring device (14) indicates warm mixed air flow (32)
13. The device as claimed in claim 12, characterized in that it is connected to a regulator (23) in the air, which regulator has a regulating connection to a regulating device for fresh air flow regulation. 12 , characterized in that 25. extends (FIG. 12) to the exhaust nozzle (16) of the combustion chamber tube (10).
The device described in. 26. Device according to claim 12, characterized in that the warm air mixing device (2) is provided with a radiating surface (33) on the underside (FIG. 12). 27. Even if the discharge nozzle (16) is smooth, it has a hoe shape (
Curved (Fig. 6) or on one side (Fig. 7) (Fig. 8)
Claims 12, 21, 22,
25. The device according to 25. 28. The hot air nozzle (15) has a flat mixed flow discharge angle (5 to 20 degrees) or a steep mixed flow discharge angle (45 degrees).
28. Device according to claims 12 and 27, characterized in that it may have an ejection nozzle with an angle of 85 degrees). 29, the configuration of the hot air nozzle (15) has a flat mixed flow discharge angle (from 5 to 20 degrees) and at the same time a steep mixed flow discharge angle (
(9th
13. Device according to claim 12, characterized in that it may be as shown in FIG. 30. The rotation and overturning device (24) of the warm air mixing device (2) can be provided with a cable polygon, either electric or manual, on the loading vehicle, or with a rod, hydraulic or pneumatic, or with a servomotor. Device 31 according to claim 12, characterized in that there is a throttle valve (5) between the axial blower (3) and the warm air mixer (2). . 32. Adjustment device (25) on the tube of the combustion chamber head (33)
Claims 12 and 1, characterized in that:
6. The device according to item 6. 33. Claim 12, characterized in that several heating units (2) can be combined into a larger unit.
, 26, 27, 28.