CN210717495U

CN210717495U - Waste heat recovery device and propane dehydrogenation reaction system

Info

Publication number: CN210717495U
Application number: CN201921295734.1U
Authority: CN
Inventors: 李汉初; 黄佳龙; 陈波
Original assignee: Dongguan Juzhengyuan Technology Co Ltd
Current assignee: Dongguan Juzhengyuan Technology Co Ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-06-09
Anticipated expiration: 2029-08-12

Abstract

The utility model provides a waste heat recovery device and a propane dehydrogenation reaction system, wherein, the waste heat recovery device comprises a waste heat boiler and a flue connected with the waste heat boiler, the waste heat recovery device also comprises a transition box connected between the waste heat boiler and the flue, and a water inlet pipeline passing through the transition box; the water outlet end of the water inlet pipeline is communicated with a feed inlet of a deaerator of the waste heat boiler, and the water inlet end of the water inlet pipeline is communicated with the outside. The utility model discloses a waste heat recovery device and propane dehydrogenation reaction system aim at solving current waste heat boiler device to the waste heat recovery utilization rate low, cause the extravagant technical problem of energy.

Description

Waste heat recovery device and propane dehydrogenation reaction system

Technical Field

The utility model relates to a propane dehydrogenation equipment field especially relates to a waste heat recovery device and propane dehydrogenation reaction system.

Background

The propane dehydrogenation device of the rum process needs 940t/h of high-temperature regeneration air at 668 ℃ to regenerate the dehydrogenation reactor so as to remove coke generated by side reaction during dehydrogenation reaction of the reactor, and simultaneously, the temperature of the reactor is raised. After the regeneration air is regenerated by the reactor, the high-temperature flue gas with the temperature of 575 ℃ is changed into high-temperature flue gas, and the high-temperature flue gas enters a waste heat boiler to recover waste heat.

At present, the rums process adopts boiler feed water and fresh cold regeneration air to recover waste heat of the high-temperature flue gas, the high-temperature flue gas passes through a steam superheat section, a high-temperature air preheating section, a steam evaporation section and a low-temperature air preheating section of a waste heat recovery waste heat boiler in sequence, the temperature is reduced to 140 ℃ and then is discharged to the atmosphere, meanwhile, the waste heat boiler generates 4.0MPa/400 ℃ steam, and the fresh cold regeneration air is preheated. Because the emission amount of the flue gas is large and the emission temperature is higher, a lot of heat energy is wasted.

In addition, the waste heat boiler recovers the waste heat of the high-temperature flue gas through the water supply and the cold air, and the deaerators are arranged in the boiler to remove oxygen and other gases dissolved in the water supply, so that corrosion of boiler water pipes, economizers and other auxiliary equipment is prevented and reduced. Therefore, the feed water of the boiler firstly passes through a deaerator, the deaerator is generally fed by 60t/h of normal-temperature desalted water, and the existing boiler injects 1.0MPa/250 ℃ of medium-pressure steam into the deaerator to heat the normal-temperature desalted water to about 104 ℃ for thermal deoxidization.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a waste heat recovery device and propane dehydrogenation reaction system, this waste heat recovery device and propane dehydrogenation reaction system aim at solving current waste heat boiler device to low, the technical problem who causes the energy waste of waste heat recovery rate.

In order to achieve the purpose, the utility model provides a waste heat recovery device, which comprises a waste heat boiler and a flue connected with the waste heat boiler, and further comprises a transition box connected between the waste heat boiler and the flue, and a water inlet pipeline passing through the transition box; the water outlet end of the water inlet pipeline is communicated with a feed inlet of a deaerator of the waste heat boiler, and the water inlet end of the water inlet pipeline is communicated with the outside.

Preferably, the water inlet pipe comprises a pipe body and a fin disposed on an outer surface of the pipe body.

Preferably, the fin surrounds the tube body for one circumference in a circumferential direction of the tube body

Preferably, the number of the fins is multiple, and the fins are arranged at intervals along the extending direction of the tube body.

Preferably, the water inlet pipe is a coil pipe.

Preferably, the coil is a stainless steel tube.

Preferably, a flow meter is arranged on the water inlet pipeline and is positioned outside the transition box and close to the water inlet end of the water inlet pipeline.

Preferably, a first temperature detector is arranged at a position, close to the water inlet end, of the water inlet pipeline, and a detection probe of the first temperature detector extends into the water inlet pipeline; the water inlet pipeline is close to the position of the water outlet end, a second temperature detector is further arranged, and a detection probe of the second temperature detector extends into the water inlet pipeline.

Preferably, the flue gas inlet of the transition box is provided with a third temperature detector, and the flue gas outlet of the transition box is provided with a fourth temperature detector.

Furthermore, the utility model also provides a propane dehydrogenation reaction system, propane dehydrogenation reaction system include propane dehydrogenation device and with the propane dehydrogenation device is connected as above waste heat recovery device.

The above technical scheme of the utility model, owing to still be provided with the transition case between exhaust-heat boiler and flue, the flue gas about 140 ℃ that comes out from exhaust-heat boiler flows through the transition case earlier, discharges from the flue again. Wherein, the water inlet pipe has been passed through in the transition case, and the water inlet of exhaust-heat boiler's oxygen-eliminating device is connected to the water inlet pipe, and the end of intaking of water inlet pipe communicates with external world to the outside normal atmospheric temperature water that comes in can absorb the heat of flue gas after the transition case of flowing through heaies up and reaches about 100 ℃, makes the temperature be close the deoxidization temperature requirement of oxygen-eliminating device, consumes the partial heat in the flue gas simultaneously, saves the steam consumption of oxygen-eliminating device. Compare and rely on the oxygen-eliminating device to provide steam and carry out the heating power deoxidization of feedwater completely among the prior art, in the scheme of this application, the inlet channel of oxygen-eliminating device passes through from the transition case, utilizes the waste heat of flue gas to heat the normal atmospheric temperature desalinized water in the inlet channel and send into the oxygen-eliminating device again after about 100 ℃. Therefore, the deaerator can save a large amount of steam consumption and reduce the energy consumption of the waste heat boiler device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of a waste heat recovery device according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				110	Waste heat boiler	120	Flue duct
111	Deaerator	200	Transition box
				300	Water inlet pipeline	310	Water outlet end
320	Water inlet end	400	Flow meter
				510	First temperature detector	520	Second temperature detector
530	Third temperature detector	540	Fourth temperature detector

The purpose of the present invention, its functional features and advantages will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as the upper and lower … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Moreover, the technical solutions of the present invention between the various embodiments can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are combined and contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and the present invention is not within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a waste heat recovery device, which includes a waste heat boiler 110 and a flue 120 connected to the waste heat boiler 110, and further includes a transition box 200 connected between the waste heat boiler 110 and the flue 120, and a water inlet pipe 300 passing through the transition box 200; the water outlet end 310 of the water inlet pipe 300 is communicated with the feed inlet of the deaerator 111 of the waste heat boiler 110, and the water inlet end 320 of the water inlet pipe 300 is communicated with the outside.

Among the above technical scheme of the utility model, owing to still be provided with transition case 200 between exhaust-heat boiler 110 and flue 120, the flue gas about 140 ℃ that comes out from exhaust-heat boiler 110 flows through transition case 200 earlier, discharges from flue 120 again. Wherein, there is inlet channel 300 in the transition case 200, and inlet channel 300 is used for the intake of exhaust-heat boiler 110's oxygen-eliminating device 111, and inlet channel 300's the end 320 of intaking communicates with the external world to the heat that the external normal atmospheric temperature water that comes in can absorb the flue gas behind transition case 200 of flowing through heaies up and reaches about 100 ℃, makes the temperature be close to the deoxidization temperature requirement of oxygen-eliminating device 111, consumes the partial heat in the flue gas simultaneously. Compare and rely on the oxygen-eliminating device to provide steam and carry out the heating power deoxidization of feedwater completely among the prior art, in the scheme of this application, the inlet channel 300 of oxygen-eliminating device 111 passes through from transition case 200, utilizes the waste heat of flue gas to heat the normal atmospheric temperature desalinized water in the inlet channel 300 and send into again in oxygen-eliminating device 111 after 100 ℃ of left and right sides. Therefore, the deaerator 111 can save a large amount of steam consumption and reduce the energy consumption of the waste heat boiler 110 device.

As a preferred embodiment of the present invention, the water inlet pipe 300 includes a pipe body and a fin provided on an outer surface of the pipe body. The fins on the outer surface of the tube body can increase the contact area of the tube body and surrounding smoke, and enhance the heat exchange effect.

As a further embodiment of the present invention, the fins surround the tube body for a circumference along the circumferential direction of the tube body. The section of the fin can be a circular arc section, a fan-shaped section, a square section or a triangular section, and the shape of the fin can be any shape as long as the heat dissipation area can be increased. The fins are tightly attached to the tube body through heat conduction materials and can be made of copper or aluminum, and the heat dissipation effect of the copper is superior to that of the aluminum.

Further, the quantity of fin is a plurality of, and a plurality of fins set up along the extending direction interval of body for the heat exchange efficiency everywhere of body is the same. Further, the water inlet pipe 300 is a coil pipe. The coil lengthens the path of the water flow through the transition box 200, so that the water flow in the inlet pipe 300 is sufficiently heated. Preferably, the coil may be a stainless steel tube for corrosion and rust resistance.

Specifically, the water inlet pipe 300 may be a pipe having a length of 7010mm and an outer diameter of 32 mm. The whole pipeline is divided into two rows, each row is provided with 33 thin tubes, the total number of the thin tubes is 66, and the heat exchange area can reach 1543 square meters. The normal temperature desalted water is divided into 33 branch pipes, enters the finned tube for heat exchange, is collected to the outlet collecting pipe and then leaves the waste heat recovery system. By using the waste heat recovery device of the embodiment, the low-temperature flue gas emission temperature of 940t/h can be reduced from 140 ℃ to 110 ℃, the heat can be recovered by 28.5MkJ more per hour, the heat can be converted into natural gas according to 8000 hours of operation per year, and the fuel cost can be saved by 2400 ten thousand yuan per year.

As a specific embodiment of the present invention, the water inlet pipe 300 is provided with a flow meter 400, and the flow meter 400 is located outside the transition box 200 and near the water inlet end 320 of the water inlet pipe 300. The flow meter 400 is used to feed back the flow in the inlet conduit 300 so that a reference can be provided for the flow rate adjustment in the inlet conduit 300.

Further, a first temperature detector 510 is arranged at a position of the water inlet pipe 300 close to the water inlet end 320, and a detection probe of the first temperature detector 510 extends into the water inlet pipe 300; the inlet pipe 300 is further provided with a second temperature detector 520 at a position close to the outlet end 310, and a detection probe of the second temperature detector 520 extends into the inlet pipe 300. The first temperature detector 510 is used to detect the temperature of the water flow as it flows into the transition box 200, and the second temperature detector 520 is used to detect the temperature of the water flow as it flows out of the transition box 200. Further, the flue gas inlet of the transition box 200 is provided with a third temperature detector 530, and the flue gas outlet of the transition box 200 is provided with a fourth temperature detector 540. The third temperature sensor 530 is used to sense the temperature of the flue gas as it flows into the transition box 200, and the fourth temperature sensor 540 is used to sense the temperature of the flue gas as it flows out of the transition box 200.

Furthermore, the utility model also provides a propane dehydrogenation reaction system, propane dehydrogenation reaction system include propane dehydrogenation device and the as above waste heat recovery device of being connected with propane dehydrogenation device.

The utility model discloses a propane dehydrogenation reaction system is owing to included propane dehydrogenation device and be connected with propane dehydrogenation device as above waste heat recovery device, and waste heat recovery device still is provided with transition case 200 between exhaust-heat boiler 110 and flue 120, and the flue gas about 140 ℃ that comes out from exhaust-heat boiler 110 flows through transition case 200 earlier, discharges from flue 120 again. Wherein, there is inlet channel 300 in the transition case 200, and inlet channel 300 is used for the intake of exhaust-heat boiler 110's oxygen-eliminating device 111, and inlet channel 300's the end 320 of intaking communicates with the external world to the heat that the external normal atmospheric temperature water that comes in can absorb the flue gas behind transition case 200 of flowing through heaies up and reaches about 100 ℃, makes the temperature be close to the deoxidization temperature requirement of oxygen-eliminating device 111, consumes the partial heat in the flue gas simultaneously. Compare and rely on the oxygen-eliminating device to provide steam and carry out the heating power deoxidization of feedwater completely among the prior art, in the scheme of this application, the inlet channel 300 of oxygen-eliminating device 111 passes through from transition case 200, utilizes the waste heat of flue gas to heat the normal atmospheric temperature desalinized water in the inlet channel 300 and send into again in oxygen-eliminating device 111 after 100 ℃ of left and right sides. Therefore, the deaerator 111 can save a large amount of steam consumption and reduce the energy consumption of the waste heat boiler 110 device.

Among the above technical solution of the utility model, above only be the utility model discloses a preferred embodiment, not consequently the restriction the utility model discloses a patent range, all be in the utility model discloses a under the technical concept, utilize the equivalent structure transform that the content was done in description and the attached drawing, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection scope.

Claims

1. The waste heat recovery device comprises a boiler and a flue connected with the boiler, and is characterized by further comprising a transition box connected between the boiler and the flue, and a water inlet pipeline passing through the transition box; the water outlet end of the water inlet pipeline is communicated with a feed inlet of a deaerator of the boiler, and the water inlet end of the water inlet pipeline is communicated with the outside.

2. The heat recovery device of claim 1, wherein the water inlet conduit comprises a tube body and fins disposed on an outer surface of the tube body.

3. The heat recovery device of claim 2, wherein the fins surround the tube body once in a circumferential direction of the tube body.

4. The waste heat recovery device according to claim 2, wherein the number of the fins is plural, and the plural fins are arranged at intervals along the extending direction of the tube body.

5. The waste heat recovery device of claim 1, wherein the water inlet pipe is a coiled pipe.

6. The waste heat recovery device of claim 5, wherein the coil is a stainless steel tube.

7. The waste heat recovery device of any one of claims 1-6, wherein a flow meter is disposed on the water inlet pipe, and the flow meter is located outside the transition box and near the water inlet end of the water inlet pipe.

8. The waste heat recovery device as claimed in any one of claims 1 to 6, wherein the water inlet pipeline is provided with a first temperature detector at a position close to the water inlet end, and a detection probe of the first temperature detector extends into the water inlet pipeline; the water inlet pipeline is close to the position of the water outlet end, a second temperature detector is further arranged, and a detection probe of the second temperature detector extends into the water inlet pipeline.

9. The waste heat recovery device of any one of claims 1-6, wherein the flue gas inlet of the transition box is provided with a third temperature detector, and the flue gas outlet of the transition box is provided with a fourth temperature detector.

10. A propane dehydrogenation reaction system comprising a propane dehydrogenation unit and the waste heat recovery device according to any one of claims 1 to 9 connected to the propane dehydrogenation unit.