Waste heat three-time utilization system of horizontal type high-temperature cracking furnace

Abstract

The utility model belongs to the technical field of tar residue pyrolysis, and particularly relates to a waste heat three-time utilization system of a horizontal high-temperature cracking furnace and an operation method of the waste heat three-time utilization system. According to the utility model, high-temperature hot gas left after pyrolysis is used for multiple times, so that the utilization rate of energy is effectively improved. In addition, the high-temperature hot gas possibly contains part of combustible gas and can pollute the environment after being directly discharged, so that the emission of harmful gas is reduced by utilizing the hot gas for many times, and the improvement of the environment quality is facilitated. Furthermore, the tar residues are preheated twice and dehydrated once before entering the pyrolysis main machine, so that the temperature of the tar residues can be closer to the temperature required by pyrolysis, and the pyrolysis efficiency and the treatment capacity of the pyrolysis main machine are improved. According to the waste heat three-time utilization system provided by the utility model, high-temperature hot gas generated in the pyrolysis process is utilized for multiple times, so that the energy utilization rate is obviously improved, the production cost is reduced, the environmental pollution is reduced, and the pyrolysis process is optimized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tar residue pyrolysis technical field, specifically relates to a waste heat three times utilization system of horizontal high temperature pyrolysis furnace. BACKGROUND

[0002] The pyrolysis principle has been applied to industrial production for a long time, and the dry distillation of wood and coal, the pyrolysis of heavy oil to produce various fuel oils and the like have been known to people. The pyrolysis equipment can be divided into continuous pyrolysis equipment and batch pyrolysis equipment according to the main technical features and the difficulty level. The main features of the batch pyrolysis equipment are that the material is processed in batches, and the production of each batch needs to go through a cycle process of opening the equipment, feeding, closing the equipment, heating, cooling, opening the equipment, taking out the material and feeding again. Since the cycle goes through the processes of heating, cooling and heating for each batch of material, on the one hand, it leads to low efficiency, small processing capacity, high energy consumption, short service life, high processing cost, on the other hand, in the process of opening and closing the equipment, the pyrolysis gas and dust cannot be avoided to be diffused without organization, which causes serious environmental pollution and safety hazards. The main features of the continuous pyrolysis production line are continuous feeding and continuous discharging, and it can be continuously and stably operated for a long time. Since it has the characteristics of large processing capacity, stable working condition, low operation cost, safety, energy saving, environmental protection and long service life, it is favored by enterprises.

[0003] The enterprises using the continuous pyrolysis production line also find some problems in the process of equipment operation. The continuous tar residue treatment equipment includes a combustion chamber and a pyrolysis main machine. The tar residue enters the pyrolysis main machine from a material feeding port, and the combustion chamber burns the mixed natural gas and air to generate high-temperature gas of 600-740 DEG C, which is introduced into the pyrolysis main machine to pyrolyze the tar residue, and finally produces coal tar, coal powder and combustible gas. Since the continuous tar residue treatment equipment is in an uninterrupted operation state, the temperature of the hot gas discharged after the high-temperature gas participates in the pyrolysis of the tar residue is as high as 500-540 DEG C, which is directly discharged into the air through a desulfurization tower, causing serious waste of energy and seriously affecting the desulfurization effect of the desulfurization tower. The discharged hot gas also mixes with non-condensable combustible gas, which also pollutes the environment. Further, since the tar residue directly enters the pyrolysis main machine from the material feeding port in a cold material state, the hot gas also needs to gradually heat the tar residue to a temperature at which the tar residue can be pyrolyzed, which also consumes part of the heat of the hot gas and indirectly increases the production cost of the enterprise. Therefore, there is an urgent need for a system for utilizing the hot gas after the pyrolysis of the tar residue to improve the energy utilization rate and reduce the production cost of the enterprise.

[0004] In view of this, the utility model is provided. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of the prior art, and provides a waste heat three times utilization system of horizontal high temperature pyrolysis furnace.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of waste heat three times utilization system of horizontal high-temperature pyrolysis furnace, including combustion chamber and the pyrolysis host intercommunication of combustion chamber, the hot gas distributor is connected to the first gas outlet of the pyrolysis host, the hot gas distributor has two gas paths, first gas path is interconnected with combustion chamber, second gas path is interconnected with the secondary gas inlet of material preheating chamber for preheating tar residue, the secondary discharge port of material preheating chamber is interconnected with the tertiary gas inlet of pyrolysis host's three-pole feed inlet, the secondary gas outlet of material preheating chamber is interconnected with the tertiary gas inlet of circulating liquid heat exchanger, the tertiary gas outlet of circulating liquid heat exchanger is interconnected with atmosphere, circulating liquid coil in circulating liquid heat exchanger is interconnected with tar residue preheating pipeline in slag tank area hopper, the secondary gas inlet of material preheating chamber is connected with slag tank area hopper.

[0008] Specifically, the pyrolysis host and the hot gas distributor are further provided with a heat recovery circulating device for driving hot gas circulation.

[0009] Specifically, the hot gas distributor is provided with a mechanical valve for adjusting and distributing the hot gas flow in the first gas path and the second gas path.

[0010] Specifically, the material preheating chamber includes a rotating inner cylinder for containing tar residue and an outer cylinder for containing hot gas, the rotating inner cylinder is sleeved in the outer cylinder, one end of the rotating inner cylinder is provided with a secondary feed inlet, the other end is provided with a secondary discharge port, the outer cylinder is provided with a secondary gas inlet close to the secondary discharge port, and the outer cylinder is provided with a secondary gas outlet close to the secondary feed inlet.

[0011] Further, the rotating inner cylinder and the secondary discharge port are further provided with a tar residue dewatering device, and the tar residue dewatering device is provided with a mixed gas outlet for discharging a gas phase mixture of coal tar and water.

[0012] Specifically, the circulating liquid heat exchanger includes a circulating outer cylinder and a circulating liquid coil arranged in the circulating outer cylinder and performing heat exchange with the hot gas in the circulating outer cylinder, a first liquid inlet of the circulating liquid coil is arranged on one side of the circulating outer cylinder away from the tertiary gas inlet of the circulating liquid heat exchanger, a first liquid outlet of the circulating liquid coil is arranged on one side of the circulating outer cylinder close to the tertiary gas inlet, and the first liquid inlet and the first liquid outlet are communicated with the tar residue preheating pipeline.

[0013] Further, the first liquid inlet is arranged at the lowest end of the circulating outer cylinder, and the first liquid outlet is arranged at the highest end of the circulating outer cylinder.

[0014] Further, the tar residue preheating pipeline is spirally wound on the inner wall of the residue tank area hopper, the second liquid inlet of the tar residue preheating pipeline is communicated with the first liquid outlet, and the second liquid outlet of the tar residue preheating pipeline is communicated with the first liquid inlet.

[0015] Specifically, the circulating liquid comprises one of heat conducting oil, water and refrigerant.

[0016] The utility model provides a kind of operation method of waste heat three times utilization system as described above, specifically as follows:

[0017] First, natural gas and air are mixed and combusted in the combustion chamber, and the hot gas produced by combustion enters the pyrolysis host, and begins to pyrolyze the tar residue, and after pyrolysis is completed, the remaining primary hot gas enters the hot gas distributor from the primary gas outlet, and after distribution, a part of the primary hot gas passes through the first gas path to the combustion chamber for preheating and then continues to pass to the pyrolysis host (first hot air waste heat), and the other part of the hot gas passes through the second gas path from the secondary gas inlet to the material preheating chamber to preheat and dehydrate the material (second hot air waste heat), and the secondary hot gas after preheating and dehydrating the material passes out through the secondary gas outlet and enters the circulating liquid heat exchanger through the tertiary gas inlet to heat the circulating liquid in the circulating liquid coil (third hot air waste heat), and the tertiary hot gas after preheating the circulating liquid passes to the desulfurization tower from the tertiary gas outlet, and is finally discharged to the atmosphere after being treated by the desulfurization tower.

[0018] At the same time, cold tar residue enters from the residue tank area hopper and is preliminarily preheated by the tar residue preheating pipeline (using third hot air waste heat), and then is pumped into the secondary feed inlet by the stepless frequency conversion plug injection pump, enters the material preheating chamber, and is preheated and dehydrated again by the second hot air waste heat, and after preheating and dehydrating is completed, is discharged from the secondary discharge outlet and enters the pyrolysis host through the tertiary feed inlet for reheating and pyrolysis by the first hot air waste heat.

[0019] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0020] The utility model discloses a three times utilization system of waste heat of horizontal high temperature pyrolysis furnace, which utilizes the high-temperature hot gas generated in the pyrolysis process for multiple times, thereby improving the energy utilization rate, reducing the production cost, and reducing the environmental pollution. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated into and form part of the specification, illustrate the principles of the utility model and, together with the description, serve to explain the utility model.

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the accompanying drawings needed to be used in the embodiment or the prior art description will be briefly introduced, and obviously, other drawings can be obtained by the drawings without the creative labor for the ordinary skilled in the art.

[0023] Figure 1 It is the schematic diagram of three times utilization system of waste heat of the utility model;

[0024] Figure 2 It is the structural schematic diagram of material preheating chamber of the utility model;

[0025] Figure 3 It is the structural schematic diagram of circulating liquid heat exchanger and slag tank area hopper of the utility model.

[0026] Among them: 11 is first gas outlet, 12 is third feeding port, 21 is second gas inlet, 22 is second gas outlet, 23 is second discharge port, 24 is second feeding port, 25 is rotating inner cylinder, 26 is outer cylinder, 27 is tar residue dewatering device, 28 is mixed gas outlet, 31 is third gas inlet, 32 is third gas outlet, 33 is circulating outer cylinder, 34 is circulating liquid coil, 35 is first liquid inlet, 36 is first liquid outlet, 37 is tar residue preheating pipeline, 38 is second liquid inlet, 39 is second liquid outlet. DETAILED DESCRIPTION

[0027] The exemplary embodiments will be described in detail below with reference to the drawings. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0028] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in further detail below with reference to the drawings and embodiments.

[0029] Embodiments

[0030] Referring to Figures 1-3 The present embodiment provides a waste heat three-time utilization system of a horizontal high-temperature pyrolysis furnace, which comprises a combustion chamber and a pyrolysis host machine in communication with the combustion chamber. The pyrolysis host machine is connected with a hot gas distribution machine at a first gas outlet 11. The hot gas distribution machine has two gas paths. The first gas path is in communication with the combustion chamber, and the second gas path is in communication with a second gas inlet 21 of a material preheating chamber for preheating tar residue. A second discharge port 23 of the material preheating chamber is in communication with a three-pole feed inlet 12 of the pyrolysis host machine. A second gas outlet 22 of the material preheating chamber is in communication with a third gas inlet 31 of a circulating liquid heat exchanger. A third gas outlet 32 of the circulating liquid heat exchanger is in communication with the atmosphere. A circulating liquid coil 34 in the circulating liquid heat exchanger is in communication with a tar residue preheating pipeline 37 in a residue tank area hopper. The residue tank area hopper is in communication with the second feed inlet 24 of the material preheating chamber.

[0031] Specifically, a heat recovery circulation device for driving the circulation of hot gas is further arranged between the pyrolysis host machine and the hot gas distribution machine.

[0032] Specifically, a mechanical valve for adjusting and distributing the flow of hot gas in the first gas path and the second gas path is arranged in the hot gas distribution machine.

[0033] Specifically, the material preheating chamber comprises a rotating inner cylinder 25 for containing tar residue and an outer cylinder 26 for containing hot gas. The rotating inner cylinder 25 is sleeved in the outer cylinder 26. One end of the rotating inner cylinder 25 is provided with the second feed inlet 24, and the other end is provided with the second discharge port 23. The outer cylinder 26 is provided with the second gas inlet 21 close to the second discharge port 23, and is provided with the second gas outlet 22 close to the second feed inlet 24.

[0034] Further, a tar residue dewatering device 27 is further arranged between the rotating inner cylinder 25 and the second discharge port 23. The tar residue dewatering device 27 is provided with a mixed gas outlet 28 for discharging a gas phase mixture of coal tar and water.

[0035] Specifically, the circulating liquid heat exchanger comprises a circulating outer cylinder 33 and a circulating liquid coil 34 arranged in the circulating outer cylinder 33 and performing heat exchange with hot gas in the circulating outer cylinder 33. A first liquid inlet 35 of the circulating liquid coil 34 is arranged at a side of the circulating outer cylinder 33 away from the tertiary gas inlet 31 of the circulating liquid heat exchanger. A first liquid outlet 36 of the circulating liquid coil 34 is arranged at a side of the circulating outer cylinder 33 close to the tertiary gas inlet 31. The first liquid inlet 35 and the first liquid outlet 36 are in communication with a tar residue preheating pipeline 37. The circulating liquid coil 34 is spirally arranged in the circulating outer cylinder 33 to increase the area of heat exchange with the hot gas.

[0036] Further, the first liquid inlet 35 is arranged at the lowest end of the circulating outer cylinder 33, and the first liquid outlet 36 is arranged at the highest end of the circulating outer cylinder 33.

[0037] Further, the tar residue preheating pipeline 37 is spirally arranged on the inner wall of the residue tank area hopper. A second liquid inlet 38 of the tar residue preheating pipeline 37 is in communication with the first liquid outlet 36. A second liquid outlet 39 of the tar residue preheating pipeline 37 is in communication with the first liquid inlet 35.

[0038] Specifically, the circulating liquid comprises one of heat-conducting oil, water and refrigerant.

[0039] Referring to Figure 1 The embodiment also provides a running method of the waste heat three-time utilization system.

[0040] First, natural gas and air are mixed and combusted in the combustion chamber. The hot gas (600-740℃) generated by the combustion enters the pyrolysis host to start the pyrolysis of tar residue. After the pyrolysis is completed, the remaining primary hot gas (500-540℃) enters the hot gas distributor from the primary gas outlet 11. After the distribution, part of the primary hot gas (480-540℃) passes through the first gas path to the combustion chamber for preheating and then continues to pass through the pyrolysis host (utilizing the first-time hot wind waste heat). Another part of the hot gas passes through the second gas path from the secondary gas inlet 21 to the material preheating chamber to preheat and dehydrate the material (utilizing the second-time hot wind waste heat). The secondary hot gas (200-280℃) after the preheating and dehydration of the material passes through the secondary gas outlet 23 and enters the circulating liquid heat exchanger through the tertiary gas inlet 31 to heat the circulating liquid in the circulating liquid coil 34 (utilizing the third-time hot wind waste heat) (heating the temperature of the circulating liquid to 90-110℃). The tertiary hot gas (110-120℃) after the preheating of the circulating liquid passes through the tertiary gas outlet 32 to the desulfurization tower, and is finally discharged to the atmosphere after the treatment of the desulfurization tower (the final exhaust temperature is 50-70℃).

[0041] At the same time, the cold tar residue enters from the residue tank area hopper and is preliminarily preheated (by using the third hot air waste heat) through the tar residue preheating pipeline 37 (the tar residue is preheated to 30-70 DEG C), and then is pumped into the secondary feeding port 24 by the stepless frequency conversion injection plug, enters the material preheating chamber (by using the second hot air waste heat) to preheat and dehydrate the tar residue again (the tar residue is preheated to 150-200 DEG C), and is discharged from the secondary discharging port 23 after preheating and dehydration, and enters the pyrolysis main machine through the third feeding port 12 to pyrolyze the tar residue by using the first hot air waste heat after reheating.

[0042] The above description is merely a specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.

[0043] It should be understood that the present application is not limited to the above-described and described content, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A waste heat triple utilization system of horizontal high-temperature pyrolysis furnace, comprising a combustion chamber and a pyrolysis main machine communicated with the combustion chamber, characterized in that, The pyrolysis host is connected with a hot gas distribution machine, the hot gas distribution machine has two gas paths, the first gas path is communicated with the combustion chamber, the second gas path is communicated with the secondary gas inlet (21) of the material preheating chamber for preheating the tar residue, the secondary discharge port (23) of the material preheating chamber is communicated with the tertiary feeding port (12) of the pyrolysis host, the secondary gas outlet (22) of the material preheating chamber is communicated with the tertiary gas inlet (31) of the circulating liquid heat exchanger, the tertiary gas outlet (32) of the circulating liquid heat exchanger is communicated with the desulfurization tower, the circulating liquid coil (34) in the circulating liquid heat exchanger is communicated with the tar residue preheating pipeline (37) in the residue tank area hopper, and the residue tank area hopper is communicated with the secondary feeding port (24) of the material preheating chamber.

2. The waste heat triple use system according to claim 1, wherein, The pyrolysis host and the hot gas distribution machine are further provided with a heat recovery circulating device for driving the hot gas circulation.

3. The waste heat triple use system according to claim 1, wherein, The hot gas distribution machine is provided with a mechanical valve for adjusting and distributing the hot gas flow in the first gas path and the second gas path.

4. The waste heat triple use system according to claim 1, wherein, The material preheating chamber comprises a rotating inner cylinder (25) for containing the tar residue and an outer cylinder (26) for containing the hot gas, the rotating inner cylinder (25) is sleeved in the outer cylinder (26), one end of the rotating inner cylinder (25) is provided with the secondary feeding port (24), the other end is provided with the secondary discharge port (23), the outer cylinder (26) is provided with the secondary gas inlet (21) close to the secondary discharge port (23), and one end of the outer cylinder (26) close to the secondary feeding port (24) is provided with the secondary gas outlet (22).

5. The waste heat tri-generation system of claim 4, wherein, The rotating inner cylinder (25) and the secondary discharge port (23) are further provided with a tar residue dewatering device (27), and the tar residue dewatering device (27) is provided with a mixed gas outlet (28) for discharging a gas phase mixture of coal tar and water.

6. The waste heat tri-generation system of claim 1, wherein, The circulating liquid heat exchanger comprises a circulating outer cylinder (33) and a circulating liquid coil (34) arranged in the circulating outer cylinder (33) and performing heat exchange with the hot gas in the circulating outer cylinder (33), a first liquid inlet (35) of the circulating liquid coil (34) is arranged on one side of the circulating outer cylinder (33) away from the tertiary gas inlet (31) of the circulating liquid heat exchanger, a first liquid outlet (36) of the circulating liquid coil (34) is arranged on one side of the circulating outer cylinder (33) close to the tertiary gas inlet (31), and the first liquid inlet (35) and the first liquid outlet (36) are communicated with the tar residue preheating pipeline (37).

7. The waste heat tri-generation system of claim 6, wherein, The first liquid inlet (35) is arranged at the lowest end of the circulating outer cylinder (33), and the first liquid outlet (36) is arranged at the highest end of the circulating outer cylinder (33).

8. The waste heat tri-generation system of claim 6, wherein, The tar residue preheating pipeline (37) is spirally wound on the inner wall of the residue tank area hopper, a second liquid inlet (38) of the tar residue preheating pipeline (37) is communicated with the first liquid outlet (36), and a second liquid outlet (39) of the tar residue preheating pipeline (37) is communicated with the first liquid inlet (35).

9. The waste heat tri-generation system of claim 1, wherein, The circulating liquid comprises one of heat conducting oil, water and refrigerant.

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