Closed continuous feeding and discharging device with efficient waste heat recovery function

Abstract

The invention belongs to the field of metallurgy and chemical engineering, and particularly relates to a closed continuous feeding and discharging device with an efficient waste heat recovery function. The device comprises a reversible spiral charging machine, and is characterized in that the reversible spiral charging machine is connected with one end of a sealed charging bucket group; the other end of the sealing material tank group is connected with a spiral conveying discharging machine; a gas cooling system and an inert gas purging system are also arranged on the sealed charging bucket group; and a detection control system is also arranged on the sealed charging bucket group. Materials can be continuously added, subjected to heat exchange and discharged in a closed production process system, and continuous automatic production is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgy and chemical industry, and particularly relates to a closed continuous feeding and discharging device with high-efficiency waste heat recovery function. BACKGROUND

[0002] In the metallurgical and chemical industry, pyrolysis and heat exchange are often carried out in flammable and explosive atmosphere and high-temperature conditions, and continuous feeding and discharging, heat exchange and cooling, and energy recovery and utilization need to be realized in a sealed system. At present, most of the roasting and pyrolysis processes adopt a screw conveyor feeding and discharging and sealing or rotary sealing mode, which cannot achieve complete sealing and can only be operated in a micro-negative pressure or micro-positive pressure mode, inevitably resulting in air entering the system or flammable and explosive gas leakage, affecting production operation, site environment and safe production, and limiting the improvement of product quality and production efficiency. In addition, external heat exchange or water cooling is mainly used, and the heat energy recovery rate of the cooled products is low or even cannot be recovered. Therefore, there is an urgent need for a closed continuous feeding and discharging device with high-efficiency waste heat recovery function to realize continuous feeding and discharging of materials, efficient heat exchange and high-efficiency recovery and utilization of heat energy, especially in a closed system of flammable and explosive hazardous gas to isolate external air without leakage, realize vacuum and high-pressure operation to optimize the process to improve production efficiency and product quality, ensure safe production and protect the environment. SUMMARY

[0003] The present application aims to provide a closed continuous feeding and discharging device with high-efficiency waste heat recovery function, which can realize continuous feeding and discharging of materials, efficient heat exchange and cooling, and full recovery of product heat energy into the system in a closed production system.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0005] A closed continuous feeding and discharging device with high-efficiency waste heat recovery function comprises a reversible screw feeder, characterized in that: one end of the reversible screw feeder is connected with a sealed tank group; the other end of the sealed tank group is connected with a screw conveyor discharging machine; a gas cooling system and an inert gas purging system are further arranged on the sealed tank group; and a detection control system is further arranged on the sealed tank group.

[0006] Further, the reversible screw feeder is provided with an inlet, below which a conveying screw is arranged, and a reversible motor is arranged beside the conveying screw; the reversible screw feeder is connected with the upper end of the first sealed tank of the sealed tank group through a first outlet, and a first sealing valve is arranged at the connection; the reversible screw feeder is connected with the upper end of the second sealed tank of the sealed tank group through a second outlet, and a second sealing valve is arranged at the connection; the lower end of the first sealed tank is connected with the screw feeder, and a first lower sealing valve is arranged at the connection; the lower end of the second sealed tank is also connected with the screw feeder, and a second lower sealing valve is arranged at the connection; and the screw feeder is further connected with a third outlet.

[0007] Further, the gas cooling system comprises a closed-system normal-temperature gas channel, the closed-system normal-temperature gas channel is connected with the first sealed tank through a first gas ring, and a first tank cold air control valve is arranged on the first gas ring; and the closed-system normal-temperature gas channel is connected with the second sealed tank through a second gas ring, and a second tank cold air control valve is arranged on the second gas ring.

[0008] Further, the inert gas purging system comprises an inert gas channel, the inert gas channel is connected with the lower part of the first sealed tank through a first gas ring, and a first sealed tank lower purging valve is arranged on the first gas ring; the closed-system normal-temperature gas channel is connected with the lower part of the second sealed tank through a second gas ring, and a second sealed tank lower purging valve is arranged on the second gas ring; the inert gas channel is also connected with the upper part of the first sealed tank, and a first sealed tank upper purging valve is arranged at the connection; the inert gas channel is also connected with the upper part of the second sealed tank, and a second sealed tank upper purging valve is arranged at the connection; and the first sealed tank is further provided with a first upper exhaust valve and a first lower exhaust valve at positions corresponding to the first sealed tank lower purging valve and the first sealed tank upper purging valve respectively; and the second sealed tank is further provided with a second upper exhaust valve and a second lower exhaust valve at positions corresponding to the second sealed tank lower purging valve and the second sealed tank upper purging valve respectively.

[0009] Further, the detection control system comprises a first tank temperature detection device arranged on the first sealed tank; a first pressure detection device is arranged beside the first tank temperature detection device; and a first material level detector is further arranged on the first sealed tank; the detection control system further comprises a second tank temperature detection device arranged on the second sealed tank; a second pressure detection device is arranged beside the second tank temperature detection device; and a second material level detector is further arranged on the second sealed tank; the detection control system comprises a combustible gas detector connected with the first sealed tank and the second sealed tank simultaneously; and the combustible gas detector is connected with the four exhaust valves.

[0010] Further, the connection mode can also be that the first sealed material tank is provided with a feeding port; the first sealed material tank is connected with one end of the screw conveyor through a first discharging port, and the other end of the screw conveyor is connected with the second sealed material tank through a second discharging port; the lower end of the first sealed material tank is connected with a gas cooling system through a first material tank cold air control valve; and the second sealed material tank is connected with an inert gas purging system through a lower purging valve.

[0011] Advantages of the present application.

[0012] The present application can continuously add, heat exchange and discharge materials in a closed production process system, realize continuous and automatic production, adjust the system pressure to realize pressurization, negative pressure operation and vacuum pyrolysis under a completely sealed state, avoid the adverse effects of the entry of relative sealed air on the reaction process, and significantly improve the product quality and production efficiency; the cooling output of high-temperature products and the efficient recycling of heat energy can greatly reduce energy consumption; and the completely closed state of the system eliminates the adverse effects of flammable and explosive gas leakage on safe production and the environment. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a process flow chart of the present application.

[0014] Fig. 2 is a process flow chart of the second embodiment of the present application.

[0015] The serial number in the figure is explained as follows: 1-reversible screw feeder, 2-feeding port, 3-reversible motor, 41-first discharging port, 42-second discharging port, 51-first sealed material tank, 52-second sealed material tank, 61-first sealing valve, 62-second sealing valve, 71-first lower sealing valve, 72-second lower sealing valve, 8-screw conveyor, 9-third discharging port, 10-closed system normal temperature gas passage, 111-first material tank cold air control valve, 112-second material tank cold air control valve, 121-first gas ring passage, 122-second gas ring passage, 13-inert gas passage, 141-first sealed material tank lower purging valve, 142-second sealed material tank lower purging valve, 151-first upper exhaust valve, 152-second upper exhaust valve, 161-first lower exhaust valve, 162-second lower exhaust valve, 171-first sealed material tank upper purging valve, 172-second sealed material tank upper purging valve, 18-combustible gas detector, 191-first material tank temperature detection device, 192-second material tank temperature detection device, 201-first pressure detection device, 202-second pressure detection device, 211-first material level detector, 212-second material level detector. DETAILED DESCRIPTION

[0016] As Figs. 1-2The present application comprises a reversible screw feeder 1, characterized in that: one end of the reversible screw feeder 1 is connected with a sealed tank group 5; the other end of the sealed tank group 5 is connected with a screw conveying discharging machine 8; a gas cooling system and an inert gas purging system are further provided on the sealed tank group 5; a detection control system is further provided on the sealed tank group 5.

[0017] Further, the reversible screw feeder 1 is provided with a feeding port 2, and a conveying screw is provided below the feeding port, and a reversible motor 3 is provided beside the conveying screw; the reversible screw feeder 1 is connected with the upper end of a first sealed tank 51 of the sealed tank group 5 through a first discharging port 41, and a first sealing valve 61 is provided at the connecting position; the reversible screw feeder 1 is connected with the upper end of a second sealed tank 52 of the sealed tank group 5 through a second discharging port 42, and a second sealing valve 62 is provided at the connecting position; the lower end of the first sealed tank 51 is connected with the screw conveying machine 8, and a first lower sealing valve 71 is provided at the connecting position; the lower end of the second sealed tank 52 is also connected with the screw conveying machine 8, and a second lower sealing valve 72 is provided at the connecting position; the screw conveying machine 8 is further connected with a third discharging port 9.

[0018] Further, the gas cooling system comprises a closed system normal temperature gas passage 10, the closed system normal temperature gas passage 10 is connected with the first sealed tank 51 through a first gas ring 121, and a first tank cold air control valve 111 is provided on the first gas ring 121; the closed system normal temperature gas passage 10 is connected with the second sealed tank 52 through a second gas ring 122, and a second tank cold air control valve 112 is provided on the second gas ring 122.

[0019] Further, the inert gas purging system comprises an inert gas passage 13, the inert gas passage 13 is connected with the lower part of the first sealed tank 51 through the first gas ring 121, and a first sealed tank lower purging valve 141 is provided on the first gas ring 121; the closed system normal temperature gas passage 10 is connected with the lower part of the second sealed tank 52 through the second gas ring 122, and a second sealed tank lower purging valve 142 is provided on the second gas ring 122; the inert gas passage 13 is also connected with the upper part of the first sealed tank 51, and a first sealed tank upper purging valve 171 is provided at the connecting position; the inert gas passage 13 is also connected with the upper part of the second sealed tank 52, and a second sealed tank upper purging valve 172 is provided at the connecting position; the first sealed tank 51 is further provided with a first upper exhaust valve 151 and a first lower exhaust valve 161 at positions corresponding to the first sealed tank lower purging valve 141 and the first sealed tank upper purging valve 171 respectively; the second sealed tank 52 is further provided with a second upper exhaust valve 152 and a second lower exhaust valve 162 at positions corresponding to the second sealed tank lower purging valve 142 and the second sealed tank upper purging valve 172 respectively.

[0020] Further, the detection control system comprises a first tank temperature detection device 191 arranged on the first sealed tank 51; a first pressure detection device 201 is arranged beside the first tank temperature detection device 191; a first material level detector 211 is further arranged on the first sealed tank 51; the detection control system comprises a second tank temperature detection device 192 arranged on the second sealed tank 52; a second pressure detection device 202 is arranged beside the second tank temperature detection device 192; a second material level detector 212 is further arranged on the second sealed tank 52; the detection control system comprises a combustible gas detector 18 connected with the first sealed tank 51 and the second sealed tank 52 simultaneously; the combustible gas detector 18 is connected with the four exhaust valves. Further, the detection control system comprises a first tank temperature detection device 191 arranged on the first sealed tank 51; a first pressure detection device 201 is arranged beside the first tank temperature detection device 191; a first material level detector 211 is further arranged on the first sealed tank 51; the detection control system comprises a second tank temperature detection device 192 arranged on the second sealed tank 52; a second pressure detection device 202 is arranged beside the second tank temperature detection device 192; a second material level detector 212 is further arranged on the second sealed tank 52; the detection control system comprises a combustible gas detector 18 connected with the first sealed tank 51 and the second sealed tank 52 simultaneously; the combustible gas detector 18 is connected with the four exhaust valves.

[0021] Further, the first sealed tank 51 is connected with the second sealed tank 52 through the first discharge port 41 and the second discharge port 42.

[0022] The working process of the application.

[0023] The material enters the screw feeder 1 through the upper reversible screw feeder inlet 2, and when the material is loaded into the first sealed tank, the lower sealing valve is closed and the upper sealing valve 61 is opened, the screw feeder rotates to load the high-temperature material from the discharge port 41 into the sealed tank 51, then the cooling gas control valve 111 is opened to make the cooling gas enter the first tank 51 through the cooling gas ring channel 121, and the cooling gas is gradually heated by the high-temperature material in the tank and the reversible screw feeder, and then enters the closed system through the inlet 2.

[0024] When the first seal tank level meter 211 detects the tank level reaches the specified, the second tank under the seal valve 72 is closed, the seal valve 62 is opened, and then the reversible screw feeder motor 3 is reversed, the reversible screw feeder 1 loads the high-temperature material from the inlet 2 into the second seal tank 52 through the outlet 42, and the cooling gas control valve 112 is opened, the normal-temperature cooling gas enters the second seal tank 52 from the closed system normal-temperature gas passage 10 through the cooling gas control valve 112 and the cold gas ring passage 122 to cool the high-temperature material in the reversible screw feeder and the second seal tank, when the first tank detection temperature 191 cools to the specified temperature, the first tank cold air control valve 111 is closed, the upper seal valve 61 is closed, the lower purge valve 141 is opened, the upper exhaust valve 151 is opened, the lower exhaust valve 161 is opened, the inert gas 13 enters the first seal tank from the first tank cold air ring passage 121 to purge the combustible gas and enter the second seal tank through the upper exhaust valve 151, the lower exhaust valve 161 and the second tank cold gas ring passage 122, and is heated after being cooled to return to the closed system; When the combustible gas concentration detected by the combustible gas detector 18 decreases to the safety specified, the 141, 151 and 161 are closed, the first tank upper purge valve 171 is opened to introduce the inert gas 13, the pressure detection 201 is kept at a micro-positive pressure, and then the lower seal valve 71 is opened to start the screw conveyor 8 to discharge the cooled material from the discharge port 9, when the material is discharged as detected by the level detector 211, the lower seal valve 71 is closed, the upper purge valve 151 is closed, and the upper seal valve 61 is opened, when the second seal tank is filled with material, the reversible screw feeder motor 3 is reversed, the reversible screw feeder 1 is reversed to load the material from the outlet 41 into the first tank, the first seal tank enters the loading and cooling mode, and the second seal tank enters the purging and discharging mode, the two seal tanks are monitored in real time by the PLC for parameters such as the level, temperature, gas concentration and pressure, the valve opening and closing and the equipment starting and stopping are automatically controlled, the automatic conversion of the operation modes of the two seal tanks is realized, and the continuous output, cooling and efficient heat recovery of the high-temperature material in the closed system are completed.

[0025] Alternatively, the application can also be used as a feeding device of the closed system, in which case the working process of the application is as follows.

[0026] The upper inlet 2 of the reversible screw feeder is connected to a receiving hopper, when the reversible screw feeder loads the material into the first closed tank, the lower seal valve is closed, the first seal tank upper seal valve 61 is opened, and the lower purge valve 141 is opened to purge the inert gas 13 into the first tank through the cold gas ring passage 121 and keep the pressure detection table 201 of the first seal tank at a micro-positive pressure to purge and replace the oxygen entering the seal tank 51 with the material, and the first seal tank enters the loading and purging mode.

[0027] When the first sealed tank level meter 211 detects the specified level, the second sealed tank lower sealing valve 72 is closed, the upper sealing valve 62 is opened, the lower purge valve 142 is opened, and then the reversible screw feeder motor 3 is reversed, the reversible screw feeder 1 reversely feeds the material from the feeding port 2 into the tank through the discharge port 42, the second sealed tank enters the feeding-purge mode, then the first sealed tank upper sealing valve 61 is closed, the lower sealing valve 71 is opened, the upper purge valve 171 is opened, inert gas 13 is introduced into the first sealed tank, and the pressure detector 211 maintains a slight positive pressure to prevent combustible gas from entering the tank, then the lower screw feeder 8 is started to feed the material from the discharge port 9 into the closed system, the first sealed tank enters the discharging-purge mode, when the first tank level meter 211 detects that the level is empty, the first tank upper purge valve 171 is closed, and the lower sealing valve 71 is closed, the second sealed tank enters the feeding-purge mode, and the first sealed tank enters the discharging-purge mode, and the automatic alternation is continued.

[0028] Optionally, the second connection mode of the present application has the following working process.

[0029] When the second sealed storage tank 52 level meter detects that the level will be full, the screw feeder 8 is accelerated to run, the level in the first tank is lowered to a low level, then the screw feeder 8 is stopped, the second sealed tank upper sealing valve 62 is closed, the upper exhaust valve 152 is opened, the combustible gas detector 18 detects that the combustible gas in the tank is reduced to a specified value, the lower purge valve 142 and the upper exhaust valve 152 are closed, the upper purge valve 142 is opened to maintain the second sealed tank pressure detector 202 in a slight positive pressure state, the lower sealing valve 72 is opened to discharge the material through the discharge port 9, and the discharging-purge mode is entered, at this time, the first cooling buffer tank continues to maintain the feeding and cooling state by using the buffer space between the low level and the high level; when the second sealed storage tank level meter detects that the level is empty, the lower sealing valve 72 is closed, the upper purge valve 172 is closed, the lower purge valve 142 is opened, the upper sealing valve 62 is opened, and the screw feeder 8 is started to feed the cooled material into the sealed storage tank, and the feeding-purge mode is entered; the high-temperature radar level meter of the first cooling buffer tank automatically monitors the level state to ensure that it runs between the high and low levels, and the pressure detector 20 and the temperature detector 19 detect the data to adjust the second tank cooling valve 112 to automatically control the cooling state, thereby realizing the efficient recovery of the continuous discharge, cooling and preheating of the high-temperature material in a closed state.

[0030] It can be understood that the above specific description of the present application is only used to illustrate the technical solutions described in the embodiments of the present application, and the ordinary skilled in the art should understand that the present application can still be modified or replaced equivalently to achieve the same technical effect; as long as the use needs are met, it is within the protection scope of the present application.

Claims

1. A closed continuous feeding and discharging device with efficient waste heat recovery function, comprising a reversible screw feeder (1), characterized in that: The reversible screw feeder (1) is connected to one end of a sealed material tank group (5); the other end of the sealed material tank group (5) is connected to a screw conveyor discharge machine (8); the sealed material tank group (5) is also equipped with a gas cooling system and an inert gas purging system; the sealed material tank group (5) is also equipped with a detection and control system.

2. The closed continuous feeding and discharging device with high-efficiency waste heat recovery function according to claim 1, characterized in that: The reversible screw feeder (1) is provided with a feed inlet (2), a conveying screw is provided below the feed inlet, and a reversible motor (3) is provided next to the conveying screw; the reversible screw feeder (1) is connected to the upper end of the first sealed tank (51) of the sealed tank group (5) through the first discharge port (41), and a first sealing valve (61) is provided at the connection; the reversible screw feeder (1) is connected to the upper end of the second sealed tank (52) of the sealed tank group (5) through the second discharge port (42), and a second sealing valve (62) is provided at the connection; the lower end of the first sealed tank (51) is connected to the screw conveyor (8), and a first lower sealing valve (71) is provided at the connection; the lower end of the second sealed tank (52) is also connected to the screw conveyor (8), and a second lower sealing valve (72) is provided at the connection; the screw conveyor (8) is also connected to a third discharge port (9).

3. A closed continuous feeding and discharging device with high-efficiency waste heat recovery function according to claim 1, characterized in that: The gas cooling system includes a closed system ambient temperature gas channel (10), which is connected to a first sealed material tank (51) through a first gas loop (121). A first material tank cold air control valve (111) is provided on the first gas loop (121). The closed system ambient temperature gas channel (10) is connected to a second sealed material tank (52) through a second gas loop (122). A second material tank cold air control valve (112) is provided on the second gas loop (122).

4. A closed continuous feeding and discharging device with high-efficiency waste heat recovery function according to claim 1, characterized in that: The inert gas purging system includes an inert gas channel (13), which is connected to the lower part of the first sealed material tank (51) via a first gas loop (121). A first sealed material tank lower purging valve (141) is provided on the first gas loop (121). The room temperature gas channel (10) of the sealed system is connected to the lower part of the second sealed material tank (52) via a second gas loop (122). A second sealed material tank lower purging valve (142) is provided on the second gas loop (122). The inert gas channel (13) is also connected to the upper part of the first sealed material tank (51), and a first sealed material tank upper purging valve is provided at the connection point. A purge valve (171); the inert gas channel (13) is also connected to the upper part of the second sealing tank (52), and a purge valve (172) for the upper part of the second sealing tank is provided at the connection point; a first upper exhaust valve (151) and a first lower exhaust valve (161) are respectively provided on the first sealing tank (51) at the positions corresponding to the lower purge valve (141) and the upper purge valve (171) of the first sealing tank; a second upper exhaust valve (152) and a second lower exhaust valve (162) are respectively provided on the second sealing tank (52) at the positions corresponding to the lower purge valve (142) and the upper purge valve (172) of the second sealing tank.

5. A closed continuous feeding and discharging device with high-efficiency waste heat recovery function according to claim 1, characterized in that: The detection and control system includes a first tank temperature detection device (191) installed on the first sealed tank (51); a first pressure detection device (201) is installed next to the first tank temperature detection device (191); a first level detector (211) is also installed on the first sealed tank (51); the PLC automated detection and control system also includes a second tank temperature detection device (192) installed on the second sealed tank (52); a second pressure detection device (202) is installed next to the second tank temperature detection device (192); a second level detector (212) is also installed on the second sealed tank (52); the detection and control system includes a combustible gas detector (18) that is connected to both the first sealed tank (51) and the second sealed tank (52); the combustible gas detector (18) is connected to four exhaust valves.

6. A closed continuous feeding and discharging device with high-efficiency waste heat recovery function according to claim 2, characterized in that: The connection method can also be as follows: the first sealed material tank (51) is provided with a feed port (2); the first sealed material tank (51) is connected to one end of the screw conveyor (8) through the first discharge port (41), and the other end of the screw conveyor (8) is connected to the second sealed material tank (52) through the second discharge port (42); the lower end of the first sealed material tank (51) is connected to a gas cooling system through the first material tank cold air control valve (111); the second sealed material tank (52) is connected to an inert gas purging system through the lower purging valve.

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