Novel air supply system for oil shale dry distillation process

Abstract

The utility model belongs to the technical field of oil shale dry distillation, and particularly relates to a novel air supply system for an oil shale dry distillation process, which comprises a main fan, a washing saturation tower, a dry distillation furnace, a combustion fan and a heating furnace, and a fan inlet butterfly valve is arranged on the outer side of an air inlet pipe on the right side of the main fan. By additionally arranging the combustion fan, an outlet pipeline of the combustion fan can be connected with an original combustion air pipeline, and a pipeline valve from an original main fan to combustion air is closed, so that main air and combustion air are separated, and the influence on the pressure of the main air in the switching process is reduced; air supply sources of saturated air for dry distillation and combustion air for combustion can be separated, and mutual interference between adjustment of the saturated air and the combustion air is reduced; a combustion fan is used as an independent gas source of combustion air of the heating furnace, and waste gas generated by cooling of a water basin of the dry distillation furnace is extracted from an inlet of the combustion fan, so that zero emission of the waste gas is realized; and the traffic relation between the main fan and the combustion fan can be used as a mutual standby in emergency, so that continuous production is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of oil shale dry distillation, in particular to a novel air supply system for an oil shale dry distillation process. Background Art

[0002] The original main fan air supply system is divided into two parts. One part is used as the main air to supply the distillation furnace after saturation heating in the saturation tower, and undergoes redox reaction with shale semi-coke to provide heat for shale distillation. The other part enters the heating furnace as combustion air and the flue gas after combustion of combustion gas to store heat for the checker bricks.

[0003] The utility model patent with publication number CN201033773Y discloses an integrated system of oil shale microwave distillation and fluidized combustion, which includes a crushing and screening device, a screw feeder, a gravity feeder, a gas-solid separation device, a condensation recovery device, an internal combustion engine, a circulating fluidized bed boiler, the boiler heating surface, a steam turbine, a dust collector, an induced draft fan, a chimney, and a slag cooler. Its characteristics are: the screw feeder is connected to the rotating drum inlet of the microwave drum distillation device, and the rotating drum discharge port of the microwave drum distillation device is connected to the gas-solid separation device inlet; the gas-solid separation device is connected to the flow-type non-mechanical sealing valve through a pipeline, the flow-type non-mechanical sealing valve is connected to the high-pressure fan, and the return inclined pipe of the flow-type non-mechanical sealing valve is connected to the circulating fluidized bed boiler inlet; the gravity feeder is connected to the return inclined pipe of the flow-type non-mechanical sealing valve through a pipeline.

[0004] The invention patent with publication number CN104531195A discloses an externally heated oil shale dry distillation process, which is characterized by: the oil shale that has been dried and dehydrated is fed from the dry distillation storage hopper into an externally heated horizontal rotary dry distillation furnace for heat exchange with a heat pipe; the dry distillation product semi-coke and dry distillation gas are simultaneously fed into a gas-solid separation chamber; the solid part of the semi-coke is fed to a combustion furnace for combustion; the generated shale ash is discharged from the bottom of the combustion furnace; the generated high-temperature flue gas is fed into the externally heated horizontal rotary dry distillation furnace The flue gas is sent to the drying chamber at the tail of the externally heated horizontal rotary retort using the residual temperature of the flue gas to dry and remove water from the oil shale ore; the gas from the gas-solid separation chamber is sent to the cooling recovery system for condensation to recover shale oil, and the uncondensed gas is sent to the combustion furnace for combustion, and the generated flue gas is sent to the outside of the externally heated horizontal rotary retort for heat exchange, or sent to the nozzle for combustion outside the externally heated horizontal rotary retort to generate high-temperature flue gas for heat exchange with the heat pipe.

[0005] However, because the heating furnace is an intermittent heating furnace, in order to ensure sufficient temperature for shale distillation, it is necessary to switch between the combustion furnace and the circulation furnace every hour, that is, turn off the combustion gas and combustion air, introduce the circulating gas, and ignite the other heating furnace. Since they share a common fan, the switching process has a great impact on the main air pressure. Each switching takes at least 8 minutes, and the main air pressure will fluctuate within 10 minutes, causing production fluctuations.

[0006] In response to the above problems, a new air supply system for oil shale distillation process is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide a new air supply system for oil shale retorting process, which solves the above-mentioned problems existing in the prior art.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a novel air supply system for an oil shale retorting process, comprising a main air blower, a washing and saturation tower, a retorting furnace, a combustion air blower, and a heating furnace, wherein a fan inlet butterfly valve is provided on the outside of the right air inlet pipe of the main air blower, a fan outlet gate valve is provided on the outside of the upper air outlet pipe of the main air blower, a connecting branch pipe 1 of the upper air outlet pipe of the main air blower is connected to the washing and saturation tower, and a saturator inlet butterfly valve is provided on the outside of the vertical portion of the connecting branch pipe 1 of the upper air outlet pipe of the main air blower;

[0009] The second connecting branch pipe of the upper air outlet pipe of the main fan is connected to the heating furnace, and a single furnace combustion air valve is provided on the outer side of the lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan. The lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan is provided with a connecting manifold, and a secondary air butterfly valve is provided on the outer side of the vertical portion of the connecting manifold;

[0010] The left side of the washing and saturation tower is connected to the distillation furnace through a connecting branch pipe three, a main air main butterfly valve is provided on the outside of the horizontal part of the left connecting branch pipe three of the washing and saturation tower, a single furnace air door is provided on the outside of the left vertical part of the left connecting branch pipe three of the washing and saturation tower, the left side of the washing and saturation tower is connected to the combustion fan through a connecting branch pipe four, a combustion fan inlet butterfly valve is provided on the outside of the connecting branch pipe four, the upper side of the combustion fan is connected to the heating furnace through a connecting branch pipe five, and a combustion fan outlet butterfly valve is provided on the outside of the connecting branch pipe five.

[0011] Preferably, a saturator inlet gate valve is provided on the outside of the horizontal portion of the connecting branch pipe 1 of the upper air outlet pipe of the main fan. The air intake amount flowing into the washing and saturation tower can be controlled by setting the saturator inlet gate valve.

[0012] Preferably, a combustion air main valve is provided on the outside of the vertical portion of the connecting branch pipe 2 of the upper air outlet pipe of the main fan. The total amount of air intake flowing into the heating furnace can be controlled by setting the combustion air main valve.

[0013] Preferably, a secondary air gate valve is provided on the outer side of the horizontal portion of the connecting manifold. The setting of the secondary air gate valve can ensure the opening and closing sealing effect of the connecting manifold.

[0014] Preferably, a main air main gate valve is provided at the horizontal portion of the left connecting branch pipe three of the washing saturation tower and located on the left side of the main air main butterfly valve. The opening and closing sealing effect of the connecting branch pipe three can be controlled by setting the main air main gate valve.

[0015] Preferably, a tertiary air gate valve is provided on the outside of the connecting branch pipe five and on the left side of the combustion fan outlet butterfly valve. By setting the tertiary air gate valve, the opening and closing sealing effect of the connecting branch pipe five can be controlled.

[0016] Preferably, the combustion fan includes a casing, an electric motor is provided inside the casing, a coupling is provided on the output shaft of the electric motor, a transmission group is provided on the outside of the coupling, a triangular bracket is provided on the back end of the transmission group, a rear cover plate group is provided on the back end of the triangular bracket, a front cover plate group is provided on the back of the rear cover plate group, and an impeller group is provided between the front cover plate group and the rear cover plate group. Through the arrangement of the electric motor, coupling and other structures, the impeller group can be driven to rotate, thereby encouraging air to circulate quickly to ensure subsequent effective combustion.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The utility model adds a combustion fan, and the combustion fan outlet pipeline can be connected to the original combustion air pipeline, and the pipeline valve from the original main fan to the combustion air can be closed to realize the separation of the main air and the combustion air, thereby reducing the influence on the main air pressure during the switching process; the air supply sources of saturated air for dry distillation and combustion air for combustion can be separated, thereby reducing the mutual interference between the adjustments of the two; the combustion fan is used as an independent air source for the combustion air of the heating furnace, and the exhaust gas generated by the cooling of the water basin of the dry distillation furnace is extracted from the inlet of the combustion fan, thereby realizing zero emission of exhaust gas; and the traffic connection between the main fan and the combustion fan can be used as a mutual backup in emergency situations to ensure continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 For the utility model Figure 1 Schematic diagram of the combustion fan;

[0021] Figure 3 For the utility model Figure 2 Schematic diagram of the internal structure from a side view.

[0022] In the figure: 20, main fan; 30, washing and saturation tower; 40, retort; 50, combustion fan; 501, casing; 502, motor; 503, coupling; 504, transmission group; 505, triangular bracket; 506, rear cover group; 507, front cover group; 508, impeller group; 60, heating furnace; 1, fan inlet butterfly valve; 2, fan outlet gate valve; 3, combustion fan inlet butterfly valve; 4, combustion fan outlet butterfly valve; 5, saturator inlet butterfly valve; 6, saturator inlet gate valve; 7, main air main butterfly valve; 8, main air main gate valve; 9, single furnace air door; 10, combustion air main valve; 11, single furnace combustion air valve; 12, secondary air butterfly valve; 13, secondary air gate valve; 14, tertiary air gate valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1 The novel air supply system for the oil shale retorting process includes a main fan 20, a washing and saturation tower 30, a retorting furnace 40, a combustion fan 50, and a heating furnace 60. A fan inlet butterfly valve 1 is provided on the outside of the right air inlet pipe of the main fan 20, a fan outlet gate valve 2 is provided on the outside of the upper air outlet pipe of the main fan 20, a connecting branch pipe 1 on the upper air outlet pipe of the main fan 20 is connected to the washing and saturation tower 30, and a saturator inlet butterfly valve 5 is provided on the outside of the vertical portion of the connecting branch pipe 1 on the upper air outlet pipe of the main fan 20;

[0025] The second connecting branch pipe of the upper air outlet pipe of the main fan 20 is connected to the heating furnace 60. A single furnace combustion air valve 11 is provided on the outer side of the lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan 20. A connecting manifold is provided on the lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan 20. A secondary air butterfly valve 12 is provided on the outer side of the vertical portion of the connecting manifold.

[0026] The left side of the washing and saturation tower 30 is connected to the distillation furnace 40 through a connecting branch pipe three. A main air main butterfly valve 7 is provided on the outside of the horizontal part of the left connecting branch pipe three of the washing and saturation tower 30. A single furnace air door 9 is provided on the outside of the left vertical part of the left connecting branch pipe three of the washing and saturation tower 30. The left side of the washing and saturation tower 30 is connected to the combustion fan 50 through a connecting branch pipe four. A combustion fan inlet butterfly valve 3 is provided on the outside of the connecting branch pipe four. The upper side of the combustion fan 50 is connected to the heating furnace 60 through a connecting branch pipe five. A combustion fan outlet butterfly valve 4 is provided on the outside of the connecting branch pipe five.

[0027] See also Figure 1 A saturator inlet gate valve 6 is provided on the outside of the horizontal part of the connecting branch pipe 1 of the upper air outlet pipe of the main fan 20. By setting the saturator inlet gate valve 6, the amount of air flowing into the washing saturation tower 30 can be controlled. A combustion air main valve 10 is provided on the outside of the vertical part of the connecting branch pipe 2 of the upper air outlet pipe of the main fan 20. By setting the combustion air main valve 10, the total amount of air flowing into the heating furnace 60 can be controlled.

[0028] See also Figure 1 A secondary air gate valve 13 is provided on the outside of the horizontal part of the connecting manifold. The setting of the secondary air gate valve 13 can ensure the opening and closing sealing effect of the connecting manifold. A main air main gate valve 8 is provided on the horizontal part of the connecting branch pipe 3 on the left side of the washing and saturation tower 30 and on the left side of the main air main butterfly valve 7. The setting of the main air main gate valve 8 can control the opening and closing sealing effect of the connecting branch pipe 3. A tertiary air gate valve 14 is provided on the outside of the connecting branch pipe 5 and on the left side of the combustion fan outlet butterfly valve 4. The setting of the tertiary air gate valve 14 can control the opening and closing sealing effect of the connecting branch pipe 5.

[0029] See also Figure 1 、 Figure 2 、 Figure 3 The combustion fan 50 includes a casing 501, an electric motor 502 is provided inside the casing 501, an output shaft of the electric motor 502 is provided with a coupling 503, a transmission group 504 is provided on the outside of the coupling 503, a triangular bracket 505 is provided on the back end of the transmission group 504, a rear cover plate group 506 is provided on the back end of the triangular bracket 505, a front cover plate group 507 is provided on the back of the rear cover plate group 506, an impeller group 508 is provided between the front cover plate group 507 and the rear cover plate group 506, and the impeller group 508 can be driven to rotate by the arrangement of the electric motor 502, the coupling 503 and other structures, thereby encouraging the rapid circulation of air to ensure subsequent effective combustion.

[0030] The specific implementation process of the present invention is as follows: when in use, by adding a combustion fan 50, the outlet pipeline of the combustion fan 50 can be connected to the original combustion air pipeline, and the pipeline valve from the original main fan 20 to the combustion air can be closed to achieve separation of the main air and the combustion air, reducing the impact on the main air pressure during the switching process; the air supply sources of saturated air for dry distillation and combustion air for combustion can be separated to reduce mutual interference between the adjustments of the two; the combustion fan 50 is used as an independent air source for the combustion air of the heating furnace 60, and the exhaust gas generated by the cooling of the water basin of the dry distillation furnace 40 is extracted at the inlet of the combustion fan 50 to achieve zero emission of exhaust gas; and the traffic connection between the main fan 20 and the combustion fan 50 can serve as a mutual backup in emergency situations to ensure continuous production;

[0031] The parameters of the combustion fan 50 are determined based on the combustion air demand of the heating furnace 60. The main air for the dry distillation is separated from the combustion air of the heating furnace 60, forming two sets of air supply lines. During the switching of the heating furnace 60, the main air volume and main air pressure of the dry distillation are not affected. By adding the combustion fan 50, the fluctuation of the switching ingredients is reduced.

[0032] After the combustion fan 50 is shut down, there is basically no impact on the pressure of the main fan 20. The flow rate of the main fan 20 is set to be stable. The staff on duty only needs to adjust the remaining gas, which reduces the difficulty of operation and increases the safety factor. The outlet pressure of the main fan 20 remains stable and unchanged, which can extend the service life of the equipment.

[0033] During this process: the scattered exhaust gas from the distillation furnace water basin is collected by adjusting the opening of the combustion fan inlet butterfly valve 3, and the collected gas is sent into the heating furnace 60 in three stages through the combustion fan 50, the single furnace combustion air valve 11, the secondary air gate valve 13, and the tertiary air gate valve 14 as combustion air to provide oxygen for the combustion of the heating furnace 60. During the activation of the combustion fan 50, the combustion air main valve 10 can be closed to achieve the separation of the main air system and the combustion air system, reducing fluctuations during switching. If the air volume of the combustion fan 50 is insufficient, the combustion air main valve 10 can be appropriately opened to supplement the total amount of combustion air to meet production needs.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel air supply system for oil shale retorting process, comprising a main air blower (20), a washing and saturation tower (30), a retorting furnace (40), a combustion air blower (50) and a heating furnace (60), characterized in that: A fan inlet butterfly valve (1) is provided on the outside of the right air inlet pipe of the main fan (20), a fan outlet gate valve (2) is provided on the outside of the upper air outlet pipe of the main fan (20), a connecting branch pipe 1 of the upper air outlet pipe of the main fan (20) is connected to the washing saturation tower (30), and a saturator inlet butterfly valve (5) is provided on the outside of the vertical portion of the connecting branch pipe 1 of the upper air outlet pipe of the main fan (20); The second connecting branch pipe of the upper air outlet pipe of the main fan (20) is connected to the heating furnace (60), and a single furnace combustion air valve (11) is provided on the outer side of the lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan (20), and a connecting manifold is provided on the lower horizontal portion of the second connecting branch pipe of the upper air outlet pipe of the main fan (20), and a secondary air butterfly valve (12) is provided on the outer side of the vertical portion of the connecting manifold; The left side of the washing and saturation tower (30) is connected to the retorting furnace (40) through a connecting branch pipe 3. A main air main butterfly valve (7) is provided on the outside of the horizontal portion of the left connecting branch pipe 3 of the washing and saturation tower (30). A single furnace air door (9) is provided on the outside of the left vertical portion of the left connecting branch pipe 3 of the washing and saturation tower (30). The left side of the washing and saturation tower (30) is connected to the combustion fan (50) through a connecting branch pipe 4. A combustion fan inlet butterfly valve (3) is provided on the outside of the connecting branch pipe 4. The upper side of the combustion fan (50) is connected to the heating furnace (60) through a connecting branch pipe 5. A combustion fan outlet butterfly valve (4) is provided on the outside of the connecting branch pipe 5.

2. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: A saturator inlet gate valve (6) is provided on the outside of the horizontal portion of the connecting branch pipe 1 of the upper air outlet pipe of the main fan (20).

3. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: A combustion air main valve (10) is provided on the outside of the vertical portion of the second connecting branch pipe of the upper air outlet pipe of the main blower (20).

4. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: A secondary air damper valve (13) is provided on the outside of the horizontal portion of the connecting manifold.

5. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: The left side of the washing and saturation tower (30) is connected to the horizontal portion of the branch pipe 3 and is provided with a main air main gate valve (8) on the left side of the main air main butterfly valve (7).

6. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: A tertiary air damper valve (14) is provided on the outside of the connecting branch pipe 5 and on the left side of the combustion blower outlet butterfly valve (4).

7. The novel air supply system for oil shale retorting process according to claim 1 is characterized in that: The combustion blower (50) comprises a casing (501), an electric motor (502) is arranged inside the casing (501), an output shaft of the electric motor (502) is provided with a coupling (503), a transmission group (504) is arranged outside the coupling (503), a triangular bracket (505) is arranged at the back end of the transmission group (504), a rear cover plate group (506) is arranged at the back end of the triangular bracket (505), a front cover plate group (507) is arranged at the back of the rear cover plate group (506), and an impeller group (508) is arranged between the front cover plate group (507) and the rear cover plate group (506).

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