Explosive granulation system based on nitrogen circulation

Abstract

The invention discloses an explosive granulation system based on nitrogen circulation, the explosive granulation system comprises an enclosed hood, a granulation main machine, a material receiving device and a conveying device, the output end of the granulation main machine, the material receiving device and the conveying device are all located in the enclosed hood, and an oxygen sensor is arranged in the enclosed hood; an air inlet and an air outlet are formed in the closed cover, the air outlet is sequentially communicated with the first wind power supply device, the condenser, the first heater, the second wind power supply device and the air inlet, an outlet of the nitrogen cylinder is further communicated between the condenser and the first heater, and the air inlet and the air outlet are provided with a first temperature sensor and a second temperature sensor respectively. According to the invention, the nitrogen in the nitrogen cylinder can be heated by the first heater and then supplied into the enclosed hood by the second wind power supply device, so that ethyl acetate in the enclosed hood is absorbed and supplied to the condenser by the first wind power supply device, and the ethyl acetate carried by the nitrogen is condensed and recovered; further, ethyl acetate is removed in the press-fitting explosive granulation process.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive granulation, and in particular relates to an explosive granulation system based on nitrogen circulation. Background Art

[0002] At present, press-packed explosives are often granulated by a granulating machine, but a large proportion of ethyl acetate solvent will exist in the granulation process of press-packed explosives. In order to prevent ethyl acetate from affecting the performance and stability of press-packed explosives, it is often necessary to remove ethyl acetate. However, most of the existing explosive granulation systems do not remove ethyl acetate during the granulation process of press-packed explosives. Summary of the invention

[0003] In order to overcome the defects of the prior art, the present invention provides an explosive granulation system based on nitrogen circulation, which can remove ethyl acetate during the granulation process of press-packed explosives.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] An explosive granulation system based on nitrogen circulation, comprising a closed cover, a granulation main machine for generating explosive particles, a receiving device for receiving explosive particles, and a conveying device for conveying explosive particles from an output end of the granulation main machine to the receiving device, wherein the output end of the granulation main machine, the receiving device and the conveying device are all located in the closed cover, and an oxygen sensor is arranged in the closed cover;

[0006] An air inlet is arranged at one end of the closed cover close to the granulation main machine, and an air outlet is arranged at one end of the closed cover close to the material receiving device. The air outlet is sequentially connected to the first wind supply device, the condenser, the first heater, the second wind supply device and the air inlet. The condenser and the first heater are also connected to the outlet of the nitrogen bottle. The air inlet and the air outlet are respectively provided with a first temperature sensor and a second temperature sensor;

[0007] The explosive granulation system based on nitrogen circulation also includes a controller, which is electrically connected to the granulation host, the conveying device, the oxygen sensor, the first wind supply device, the first heater, the second wind supply device, the first temperature sensor and the second temperature sensor.

[0008] The beneficial effects of adopting the above technical scheme are as follows: explosive particles can be generated by the granulation main machine and transported to the receiving device through the conveying device. During this process, the nitrogen in the nitrogen bottle can be heated by the first heater and then supplied to the closed cover by the second wind supply device to absorb the ethyl acetate in the closed cover and supply it to the condenser through the first wind supply device, so that the ethyl acetate carried by the nitrogen is condensed and recovered, and then the ethyl acetate is removed in the process of pressurized explosive granulation; at the same time, the nitrogen after condensation can be recycled, which is conducive to improving the reuse rate of nitrogen and reducing costs; in addition, the first temperature sensor and the second temperature sensor can respectively detect the temperature of the air inlet and the air outlet, so as to cooperate with the first heater to control the temperature in the closed cover, the oxygen sensor can detect the oxygen concentration in the closed cover, so as to control the oxygen concentration in the closed cover by supplying nitrogen through the second wind supply device, and the flow rate of nitrogen can be controlled by the second wind supply device, the granulation parameters of the granulation main machine and the conveying speed of the conveying device can also be controlled, which is conducive to the efficient removal of ethyl acetate under the premise of ensuring the granulation efficiency.

[0009] In one embodiment, a plurality of electrostatic detection devices are provided on the closed cover, and the electrostatic detection devices are electrically connected to the controller.

[0010] The beneficial effect of adopting the above technical solution is as follows: since explosives are a dangerous source, the explosive granulation system based on nitrogen circulation is provided with an electrostatic detection device for the dangerous source so as to deal with static electricity in time when it is generated, thereby avoiding the static electricity voltage from exceeding the safety threshold, thereby ensuring the safe operation of the explosive granulation system based on nitrogen circulation.

[0011] In one embodiment, a dust filter is provided between the air outlet and the first wind supply device.

[0012] The beneficial effect of adopting the above technical solution is that the dust filter can filter the dust flowing through to prevent the dust from being supplied to the condenser through the first wind supply device, thereby preventing the dust from being discharged from the liquid outlet of the condenser and affecting the ethyl acetate metering.

[0013] In one embodiment, the liquid outlet of the condenser is connected to an ethyl acetate recovery container.

[0014] The beneficial effect of adopting the above technical solution is that the ethyl acetate recovery container can recover the ethyl acetate solvent discharged from the liquid outlet of the condenser, so as to make the explosive granulation system based on nitrogen circulation more green and environmentally friendly.

[0015] In one embodiment, a liquid level sensor is provided in the ethyl acetate recovery container, and the liquid level sensor is electrically connected to the controller.

[0016] The beneficial effect of adopting the above technical solution is that the liquid level sensor can detect the liquid level of the ethyl acetate solvent recovered in the ethyl acetate recovery container, so as to facilitate the acquisition of the ethyl acetate recovery amount, thereby facilitating the calculation of the actual condensation efficiency of the condenser.

[0017] In one embodiment, an ethyl acetate sensor is disposed at both the air inlet and the air outlet of the condenser, and the ethyl acetate sensor is electrically connected to the controller.

[0018] The beneficial effects of adopting the above technical solution are: the ethyl acetate sensors at the air inlet and outlet ends of the condenser can detect the ethyl acetate concentration at the air inlet and outlet ends of the condenser, so as to facilitate adjusting the speed of the first wind supply device accordingly, so as to efficiently remove the ethyl acetate absorbed in the nitrogen through the condenser.

[0019] In one embodiment, a first solenoid valve and a second solenoid valve are respectively disposed at the air inlet end and the air outlet end of the condenser, and the first solenoid valve and the second solenoid valve are both electrically connected to a controller.

[0020] In one embodiment, the explosive granulation system based on nitrogen circulation also includes a bypass pipe, and a third solenoid valve and a fourth solenoid valve are respectively provided at both ends of the bypass pipe, and the third solenoid valve and the fourth solenoid valve are electrically connected to a controller. An end of the third solenoid valve away from the bypass pipe is connected to an end of the first solenoid valve away from the condenser, and an end of the fourth solenoid valve away from the bypass pipe is connected to an end of the second solenoid valve away from the condenser.

[0021] The beneficial effects of adopting the above technical solution are: before granulation starts, the first solenoid valve and the second solenoid valve can be closed, and the third solenoid valve and the fourth solenoid valve can be opened to allow nitrogen to circulate through the bypass pipe; when the oxygen concentration reaches a certain value, granulation starts, at which time the third solenoid valve and the fourth solenoid valve are closed, and the first solenoid valve and the second solenoid valve are opened to allow nitrogen absorbed with ethyl acetate to flow through the condenser, thereby condensing ethyl acetate through the condenser.

[0022] In one embodiment, the granulation main machine and the material receiving device are respectively located at two ends of the closed cover, and the length direction of the conveying device matches the length direction of the closed cover.

[0023] The beneficial effect of adopting the above technical solution is: by setting it in this way, the flow direction of nitrogen in the closed cover is consistent with the conveying direction of the granular explosive, which is beneficial to improving the ethyl acetate absorption efficiency.

[0024] In one embodiment, the controller is electrically connected to an explosion-proof operating screen, and the explosion-proof operating screen is located outside the closed cover.

[0025] The beneficial effect of adopting the above technical solution is: such an arrangement facilitates the display of data detected by devices such as oxygen sensors, first temperature sensors and second temperature sensors, and also facilitates the adjustment of operating parameters of devices such as the granulating main machine, the conveying device, the first wind supply device, the first heater and the second wind supply device outside the closed cover.

[0026] The beneficial effects of the present invention are:

[0027] Explosive particles are generated by a granulation main machine and transported to a receiving device via a conveying device. During this process, the nitrogen in the nitrogen bottle can be heated by a first heater and then supplied to the closed cover by a second wind supply device, so as to absorb the ethyl acetate in the closed cover and supply it to a condenser via the first wind supply device, thereby condensing and recovering the ethyl acetate carried by the nitrogen, and then removing the ethyl acetate during the granulation process of the pressed explosive. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0029] Figure 1 Shows a schematic diagram of the internal structure of the present invention;

[0030] Figure 2 Shows Figure 1 A top view of

[0031] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0032] Reference numerals:

[0033] 1-enclosed cover, 2-second wind supply device, 3-granulation main machine, 4-conveying device, 5-second heater, 6-material receiving device, 7-dust filter, 8-first wind supply device, 9-first solenoid valve, 10-condenser, 11-second solenoid valve, 12-first heater, 13-ethyl acetate recovery container. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] The present invention provides an explosive granulation system based on nitrogen circulation, such as Figure 1 and Figure 2 As shown, it comprises a closed cover 1, a granulating main machine 3 for generating explosive particles, a receiving device 6 for receiving explosive particles, and a conveying device 4 for conveying the explosive particles from the output end of the granulating main machine 3 to the receiving device 6, the output end of the granulating main machine 3, the receiving device 6 and the conveying device 4 are all located in the closed cover 1, and an oxygen sensor is arranged in the closed cover 1;

[0036] An air inlet is provided at one end of the closed cover 1 close to the granulation main machine 3, and an air outlet is provided at one end of the closed cover 1 close to the material receiving device 6. The air outlet is connected to the first wind supply device 8, the condenser 10, the first heater 12, the second wind supply device 2 and the air inlet in sequence. The condenser 10 and the first heater 12 are also connected to the outlet of the nitrogen bottle. The air inlet and the air outlet are respectively provided with a first temperature sensor and a second temperature sensor;

[0037] The explosive granulation system based on nitrogen circulation also includes a controller, which is electrically connected to the granulation host 3, the conveying device 4, the oxygen sensor, the first wind supply device 8, the first heater 12, the second wind supply device 2, the first temperature sensor and the second temperature sensor.

[0038] It can be understood that the explosive particles can be generated by the granulation main unit 3 and transported to the receiving device via the conveying device 4. During this process, the nitrogen in the nitrogen bottle can be heated by the first heater 12 and then supplied to the closed cover 1 by the second wind supply device 2, so as to absorb the ethyl acetate in the closed cover 1 and supply it to the condenser 10 via the first wind supply device 8, so as to condense and recover the ethyl acetate carried by the nitrogen, and then remove the ethyl acetate during the granulation process of the pressed explosive.

[0039] At the same time, the nitrogen after condensation treatment can be recycled, which is beneficial to improve the reuse rate of nitrogen and reduce costs.

[0040] In addition, the first temperature sensor and the second temperature sensor can respectively detect the temperatures of the air inlet and the air outlet, so as to cooperate with the first heater 12 to control the temperature inside the closed cover 1. The oxygen sensor can detect the oxygen concentration in the closed cover 1, so as to control the oxygen concentration in the closed cover 1 by supplying nitrogen through the second wind supply device 2. The flow rate of nitrogen can be controlled by the second wind supply device 2. The granulation parameters of the granulation main unit 3 and the conveying speed of the conveying device 4 can also be controlled, which is conducive to the efficient removal of ethyl acetate while ensuring the granulation efficiency.

[0041] It should be noted that nitrogen is an inert gas and will not react chemically with ethyl acetate; in addition, the flow rate of nitrogen and the granulation parameters of the granulation host 3 both have an impact on the granulation effect of the granular explosive, and an ideal granulation result can be achieved by adjusting these parameters.

[0042] It should also be noted that the first wind supply device 8 can be a diaphragm booster pump, the second wind supply device 2 can be an axial flow fan, the conveying device 4 can be a conveyor, and the material receiving device 6 can be a material receiving tray; a weighing device can be arranged under the material receiving device 6 to facilitate weighing the weight of the granular explosive received by the material receiving device 6; the lower end of the closed cover 1 can also be laid along the length direction with a second heater 5 electrically connected to the controller.

[0043] In one embodiment, a plurality of electrostatic detection devices are provided on the closed cover 1, and the electrostatic detection devices are electrically connected to the controller.

[0044] It is understandable that, since explosives are a source of danger, the explosive granulation system based on nitrogen circulation is equipped with an electrostatic detection device for the source of danger so as to promptly handle static electricity when it is generated, thereby preventing the static electricity voltage from exceeding the safety threshold, thereby ensuring the safe operation of the explosive granulation system based on nitrogen circulation.

[0045] It should be noted that the granulation main machine 3, the conveying device 4 and the closed cover 1 are all grounded to help eliminate static electricity during the granulation process of the press-packed explosive.

[0046] In one embodiment, a dust filter 7 is provided between the air outlet and the first wind supply device 8 .

[0047] It is understandable that the dust filter 7 can filter the dust flowing through to prevent the dust from being supplied to the condenser 10 through the first wind supply device 8, thereby preventing the dust from being discharged from the liquid outlet of the condenser 10 and affecting the ethyl acetate metering.

[0048] In one embodiment, the liquid outlet of the condenser 10 is connected to the ethyl acetate recovery container 13 .

[0049] It can be understood that the ethyl acetate recovery container 13 can recover the ethyl acetate solvent discharged from the liquid outlet of the condenser 10, so as to make the explosive granulation system based on nitrogen circulation more environmentally friendly.

[0050] It should be noted that the ethyl acetate recovered by the ethyl acetate recovery container 13 can be further purified and processed.

[0051] In one embodiment, a liquid level sensor is provided in the ethyl acetate recovery container 13, and the liquid level sensor is electrically connected to the controller.

[0052] It is understandable that the liquid level sensor can detect the liquid level of the ethyl acetate solvent recovered in the ethyl acetate recovery container 13 to facilitate obtaining the amount of ethyl acetate recovered, thereby facilitating calculation of the actual condensation efficiency of the condenser 10 .

[0053] In one embodiment, an ethyl acetate sensor is disposed at both the air inlet and the air outlet of the condenser 10 , and the ethyl acetate sensor is electrically connected to the controller.

[0054] It can be understood that the ethyl acetate sensors at the air inlet and outlet ends of the condenser 10 can detect the ethyl acetate concentration at the air inlet and outlet ends of the condenser 10, so as to facilitate adjusting the speed of the first wind supply device 8 accordingly, so as to efficiently remove the ethyl acetate absorbed in the nitrogen through the condenser 10.

[0055] In one embodiment, the air inlet end and the air outlet end of the condenser 10 are respectively provided with a first solenoid valve 9 and a second solenoid valve 11, and the first solenoid valve 9 and the second solenoid valve 11 are both electrically connected to a controller; the explosive granulation system based on nitrogen circulation also includes a bypass pipe, and the two ends of the bypass pipe are respectively provided with a third solenoid valve and a fourth solenoid valve, and the third solenoid valve and the fourth solenoid valve are both electrically connected to the controller, and the end of the third solenoid valve away from the bypass pipe is connected to the end of the first solenoid valve 9 away from the condenser 10, and the end of the fourth solenoid valve away from the bypass pipe is connected to the end of the second solenoid valve 11 away from the condenser 10.

[0056] It can be understood that, before granulation starts, the first solenoid valve 9 and the second solenoid valve 11 can be closed, and the third solenoid valve and the fourth solenoid valve can be opened to allow nitrogen to circulate through the bypass pipe; when the oxygen concentration reaches a certain value, granulation starts, at which time the third solenoid valve and the fourth solenoid valve are closed, and the first solenoid valve 9 and the second solenoid valve 11 are opened to allow nitrogen absorbed with ethyl acetate to flow through the condenser 10, thereby condensing ethyl acetate through the condenser 10.

[0057] It should be noted that, in view of the hazard source of explosives, it is also necessary to control the oxygen concentration in the closed cover 1. Therefore, before the start of granulation, it is necessary to reduce the oxygen concentration in the closed cover 1 by introducing nitrogen. When the oxygen concentration in the closed cover 1 does not exceed the relevant specified value, granulation can be started.

[0058] In one embodiment, the granulation main unit 3 and the material receiving device 6 are respectively located at the two ends of the closed cover 1, and the length direction of the conveying device 4 matches the length direction of the closed cover 1, so that the flow direction of the nitrogen in the closed cover 1 is consistent with the conveying direction of the granular explosive, which is beneficial to improve the ethyl acetate absorption efficiency.

[0059] In one embodiment, the controller is electrically connected to an explosion-proof operating screen, which is located outside the enclosed cover 1 to facilitate the display of data detected by devices such as oxygen sensors, first temperature sensors, and second temperature sensors, and to facilitate the adjustment of operating parameters of devices such as the granulating main unit 3, the conveying device 4, the first wind supply device 8, the first heater 12, and the second wind supply device 2 outside the enclosed cover 1.

[0060] The process of the present invention comprises the following steps:

[0061] Fill and exhaust nitrogen in the closed cover 1 until the oxygen concentration in the closed cover 1 drops to 2%;

[0062] The first heater 12 is started until the temperature of the air inlet rises to 70°C; the first temperature sensor and the second temperature sensor detect the temperature in the closed cover 1 in real time, and the first heater 12 and the second heater 5 adjust the temperature in the closed cover 1 in real time to maintain the temperature in the closed cover 1 at 70°C;

[0063] A certain weight of slurry explosive material is added, the second wind power supply device 2 and the first wind power supply device 8 are started, the granulating main machine 3 starts granulating and produces wet granular explosive, and the conveying device 4 conveys the wet granular explosive to the material receiving device 6; at the same time, the explosion-proof operation screen records the granulating parameters of the granulating main machine 3, the conveying speed of the conveying device 4 and the granulating time;

[0064] After granulation is completed, the wet granular explosive in the feeding device 6 is weighed;

[0065] drying the wet granular explosive to obtain dry granular explosive, and weighing the dry granular explosive;

[0066] The actual condensation efficiency of the condenser 10 is calculated according to the weight of the slurry explosive material, the weight of the wet granular explosive and the amount of ethyl acetate recovered; the ethyl acetate solvent content in the wet granular explosive is calculated according to the weight of the dry granular explosive and the weight of the wet granular explosive; the nitrogen absorption efficiency is calculated according to the weight of the slurry explosive material, the weight of the wet granular explosive and the granulation time.

[0067] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0068] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. An explosive granulation system based on nitrogen circulation, characterized in that: The invention comprises a closed cover (1), a granulating main machine (3) for generating explosive particles, a receiving device (6) for receiving the explosive particles, and a conveying device (4) for conveying the explosive particles from the output end of the granulating main machine (3) to the receiving device (6), wherein the output end of the granulating main machine (3), the receiving device (6) and the conveying device (4) are all located in the closed cover (1), and an oxygen sensor is arranged in the closed cover (1); An air inlet is provided at one end of the closed cover (1) close to the granulating main machine (3), and an air outlet is provided at one end of the closed cover (1) close to the material receiving device (6), the air outlet is connected in sequence to the first wind supply device (8), the condenser (10), the first heater (12), the second wind supply device (2) and the air inlet, and the condenser (10) and the first heater (12) are also connected to the outlet of the nitrogen bottle, and the air inlet and the air outlet are respectively provided with a first temperature sensor and a second temperature sensor; It also includes a controller, which is electrically connected to the granulation main machine (3), the conveying device (4), the oxygen sensor, the first wind supply device (8), the first heater (12), the second wind supply device (2), the first temperature sensor and the second temperature sensor.

2. The explosive granulation system based on nitrogen circulation according to claim 1, characterized in that: The closed cover (1) is provided with a plurality of electrostatic detection devices, and the electrostatic detection devices are electrically connected to the controller.

3. The explosive granulation system based on nitrogen circulation according to claim 1 is characterized in that: A dust filter (7) is provided between the air outlet and the first wind supply device (8).

4. The explosive granulation system based on nitrogen circulation according to claim 1, characterized in that: The liquid outlet end of the condenser (10) is connected to an ethyl acetate recovery container (13).

5. The explosive granulation system based on nitrogen circulation according to claim 4, characterized in that: A liquid level sensor is arranged in the ethyl acetate recovery container (13), and the liquid level sensor is electrically connected to the controller.

6. The explosive granulation system based on nitrogen circulation according to claim 1, characterized in that: The air inlet and air outlet ends of the condenser (10) are both provided with ethyl acetate sensors, and the ethyl acetate sensors are electrically connected to the controller.

7. The explosive granulation system based on nitrogen circulation according to claim 1, characterized in that: The air inlet end and the air outlet end of the condenser (10) are respectively provided with a first solenoid valve (9) and a second solenoid valve (11), and the first solenoid valve (9) and the second solenoid valve (11) are both electrically connected to the controller.

8. The explosive granulation system based on nitrogen circulation according to claim 7, characterized in that: It also includes a bypass pipe, wherein a third solenoid valve and a fourth solenoid valve are respectively provided at both ends of the bypass pipe, and the third solenoid valve and the fourth solenoid valve are both electrically connected to the controller. The end of the third solenoid valve away from the bypass pipe is connected to the end of the first solenoid valve (9) away from the condenser (10), and the end of the fourth solenoid valve away from the bypass pipe is connected to the end of the second solenoid valve (11) away from the condenser (10).

9. The explosive granulation system based on nitrogen circulation according to claim 1, characterized in that: The granulating main machine (3) and the material receiving device (6) are respectively located at two ends of the closed cover (1), and the length direction of the conveying device (4) matches the length direction of the closed cover (1).

10. An explosive granulation system based on nitrogen circulation according to any one of claims 1 to 9, characterized in that: The controller is electrically connected to an explosion-proof operating screen, and the explosion-proof operating screen is located outside the closed cover (1).

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