Sand raking system for maintenance of cold box of air separation fractionation device

Abstract

The utility model discloses a sand raking system for cold box maintenance of an air separation fractionation device, which comprises a cold box body, the cold box body is fixedly connected with a sand raking system and a pressure monitor respectively, the sand raking system can realize negative-pressure sand raking, the pressure monitor can monitor the pressure in the cold box body, and the pressure monitor can monitor the pressure in the cold box body. The sand raking system comprises a main air exhaust system and an auxiliary air exhaust system, the main air exhaust system and the auxiliary air exhaust system are electrically connected with the controller in a control mode, and the controller is electrically connected with the pressure monitor in a transmission mode. Negative-pressure sand raking can be achieved through the sand raking system, a large amount of pearlife is prevented from being sprayed out, and potential safety hazards are reduced; and through the controller, the air exhaust modes, including parallel air exhaust, series air exhaust or intermittent air exhaust, of the main air exhaust system and the auxiliary air exhaust system can be flexibly controlled, so that different maintenance requirements are met, and more accurate control over the internal environment of the cold box is achieved.

Description

Technical field:

[0001] The utility model relates to the technical field of cold box maintenance, in particular to a sand scraping system for cold box maintenance of an air separation and fractionation device. Background technology:

[0002] The cold box of the air fractionation unit needs regular maintenance to ensure the working effect of the cold box. However, since there are about 6000m 3 Pearlescent sand is in large quantity and powder form, which can easily diffuse into the air and cause pollution. The traditional way of filling pearlescent sand is to manually scrape the sand, which has the problem of environmental pollution. If the scraping mouth is not properly controlled, it may cause a large amount of pearlescent sand to spray out, causing the risk of sand explosion and causing accidents. Utility model content:

[0003] To this end, the utility model provides a sand scraping system for cold box maintenance of an air separation distillation device, so as to overcome the problem of manual sand scraping in the prior art, which has environmental pollution and may cause a large amount of pearl sand to be ejected if the sand scraping port is not properly controlled, resulting in the risk of sand explosion causing accidents.

[0004] The utility model is implemented by the following technical solutions:

[0005] A sand-removing system for cold box maintenance of an air separation and fractionation device comprises a cold box body, to which a sand-removing system and a pressure monitor are respectively fixedly connected, and the sand-removing system can realize negative pressure sand-removing, and the pressure monitor can monitor the pressure inside the cold box body, the sand-removing system comprises a main air pumping system and an auxiliary air pumping system, the main air pumping system and the auxiliary air pumping system are respectively electrically connected to a controller, and the controller is electrically connected to the pressure monitor, and the controller can control the main air pumping system and the auxiliary air pumping system to act on the cold box body through parallel air pumping, series air pumping or intermittent air pumping.

[0006] Preferably, the main air extraction system comprises a first vacuum pump, the first vacuum pump is fixedly connected to the cold box body via a first conduit, and a first electric valve is fixed on the first conduit.

[0007] Preferably, the auxiliary air extraction system comprises a second vacuum pump, the second vacuum pump is fixedly connected to the cold box body via a second conduit, and a second electric valve is fixed on the second conduit.

[0008] Preferably, two third conduits are fixedly connected between the first conduit and the second conduit, and the two third conduits are arranged between the first electric valves, and the two third conduits are also arranged between the second vacuum pumps, and the two third conduits are arranged at the side ends of the second electric valves, and the third electric valves are fixed on the third conduits.

[0009] Preferably, the first vacuum pump, the first electric valve, the second vacuum pump, the second electric valve and the third electric valve are electrically connected to the controller respectively.

[0010] Preferably, the suction rate of the second vacuum pump is lower than that of the first vacuum pump, and the second vacuum pump can be replaced by a fan or other suction equipment.

[0011] The advantages of the utility model are as follows: negative pressure sand removal can be achieved through the sand removal system to prevent large amounts of pearl sand from being sprayed out, reducing safety hazards, and the air extraction methods of the main air extraction system and the auxiliary air extraction system can be flexibly controlled through the controller, including parallel air extraction, series air extraction or intermittent air extraction, to meet different maintenance needs and achieve more precise internal environment control of the cold box. Description of the drawings:

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic diagram of the structure of the utility model.

[0014] In the figure: a cold box body 1, a pressure monitor 2, a first vacuum pump 3, a second vacuum pump 4, a first electric valve 5, a second electric valve 6, a third electric valve 7, and a controller 8. Specific implementation method:

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1 As shown, a sand-removing system for cold box maintenance of an air separation and distillation device comprises a cold box body 1, to which a sand-removing system and a pressure monitor 2 are respectively fixedly connected, and the sand-removing system can realize negative pressure sand-removing, and the pressure monitor 2 can monitor the pressure inside the cold box body 1, the sand-removing system comprises a main air pumping system and an auxiliary air pumping system, the main air pumping system and the auxiliary air pumping system are respectively electrically connected to a controller 8 for control, and the controller 8 is electrically connected to the pressure monitor 2 for transmission, and the controller 8 can control the main air pumping system and the auxiliary air pumping system to act on the cold box body 1 through parallel air pumping, series air pumping or intermittent air pumping.

[0017] Specifically, the pressure monitor 2 measures the pressure in the cold box body 1 in real time and transmits the data to the controller 8 to implement different air extraction modes:

[0018] Parallel air extraction: The main air extraction system and the auxiliary air extraction system work simultaneously, extracting air and pearl sand from different positions of the cold box body 1 at the same time, thereby improving the sand removal efficiency.

[0019] Series exhaust: The main exhaust system and the auxiliary exhaust system work in sequence. First, the main exhaust system performs preliminary extraction, and then the auxiliary exhaust system performs deep cleaning to ensure that the sand is thoroughly removed.

[0020] Intermittent vacuuming: The main vacuuming system and the auxiliary vacuuming system work alternately. This mode is usually used in situations where the pressure in the cold box body 1 needs to be precisely controlled.

[0021] The controller 8 determines the pressure condition in the cold box body 1 according to the data of the pressure monitor 2, and selects the appropriate vacuum mode accordingly. If the pressure is too high, the controller 8 will select parallel vacuum to quickly reduce the pressure; if the pressure is moderate, series vacuum may be selected to ensure the thoroughness of sand removal; when fine control of the pressure is required, the controller 8 will select intermittent vacuum.

[0022] During the entire sand-scraping process, the real-time monitoring of the pressure monitor 2 and the intelligent control of the controller 8 ensure the safety of the operation; once abnormal pressure is detected, the controller 8 will immediately adjust the air extraction strategy or even suspend the sand-scraping operation to prevent danger.

[0023] The sand-removing system monitors the pressure in the cold box body 1 in real time and intelligently adjusts the air extraction strategy according to the pressure conditions, thereby achieving safe and efficient sand-removing operations.

[0024] The main vacuum system comprises a first vacuum pump 3, which is fixedly connected to the cold box body 1 through a first conduit, and a first electric valve 5 is fixed on the first conduit.

[0025] The auxiliary exhaust system comprises a second vacuum pump 4, which is fixedly connected to the cold box body 1 through a second conduit, and a second electric valve 6 is fixed on the second conduit.

[0026] Two third conduits are fixedly connected between the first conduit and the second conduit, and the two third conduits are arranged between the first electric valves 5, and the two third conduits are also arranged between the second vacuum pumps 4, and the two third conduits are arranged at the side ends of the second electric valve 6, and the third electric valve 7 is fixed on the third conduits.

[0027] The first vacuum pump 3 , the first electric valve 5 , the second vacuum pump 4 , the second electric valve 6 and the third electric valve 7 are electrically connected to the controller 8 respectively.

[0028] The suction rate of the second vacuum pump 4 is lower than that of the first vacuum pump 3, and the second vacuum pump 4 can be replaced by a fan or other suction equipment.

[0029] Specifically,

[0030] Make sure that the controller 8 is powered on, and all the electric valves (the first electric valve 5, the second electric valve 6 and the third electric valve 7) and the vacuum pumps (the first vacuum pump 3 and the second vacuum pump 4) are in standby mode;

[0031] According to the change of the pressure of the cold box body 1, the switching between parallel extraction, series extraction and intermittent extraction can be adjusted in the following ways:

[0032] Initial stage: parallel vacuuming, opening the first electric valve 5 and the second electric valve 6, closing the two third electric valves 7, and starting the first vacuum pump 3 and the second vacuum pump 4;

[0033] In the initial stage when the pressure of the cold box body 1 is relatively high, the parallel auxiliary exhaust device is started.

[0034] The auxiliary device works simultaneously with the main air extraction device to accelerate the pressure drop rate in the cold box body 1;

[0035] Pressure drop stage: switch to series vacuuming, open the two third electric valves 7, close the first electric valve 5 and the second electric valve 6, and start the first vacuum pump 3 and the second vacuum pump 4;

[0036] When the pressure in the cold box body 1 drops to a certain level, it switches to the series exhaust mode, where the auxiliary exhaust device performs rough exhaust first, and then the main exhaust device performs fine exhaust, which can improve the overall exhaust efficiency and reduce the load of the main exhaust device;

[0037] Approaching the target pressure stage: intermittently pumping air, opening the first electric valve 5 and the second electric valve 6, closing the two third electric valves 7, and the controller 8 controls the first vacuum pump 3 and the second vacuum pump 4 to work alternately;

[0038] When the pressure of the cold box body 1 approaches the target value, it switches to the intermittent pumping mode, and the main pumping device and the auxiliary pumping device work alternately to perform fine pressure control. This intermittent mode can avoid pressure overshoot and improve stability.

[0039] When the pressure fluctuates greatly: switch to parallel pumping again. If the pressure in the box fluctuates greatly, switch back to parallel pumping mode. Parallel pumping can utilize the rapid pumping capacity of the auxiliary device to stabilize the pressure in the box.

[0040] By real-time monitoring of the pressure changes in the box and dynamically switching the vacuum mode according to the above strategy, the performance and stability of the entire negative pressure extraction system can be maximized. The specific switching timing and parameter settings need to be debugged and optimized according to the actual application scenario.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand stripping system for cold box maintenance of an air fractionation unit, comprising a cold box body, characterized in that: The cold box body is respectively fixedly connected with a sand-removing system and a pressure monitor, and the sand-removing system can realize negative pressure sand-removing, and the pressure monitor can monitor the pressure inside the cold box body. The sand-removing system includes a main air pumping system and an auxiliary air pumping system, and the main air pumping system and the auxiliary air pumping system are respectively electrically connected to the controller, and the controller is electrically connected to the pressure monitor. The controller can control the main air pumping system and the auxiliary air pumping system to act on the cold box body through parallel air pumping, series air pumping or intermittent air pumping.

2. The sand stripping system for cold box maintenance of air fractionation and distillation device according to claim 1, characterized in that: The main air extraction system comprises a first vacuum pump, which is fixedly connected to the cold box body through a first conduit, and a first electric valve is fixed on the first conduit.

3. The sand stripping system for cold box maintenance of air fractionation and distillation device according to claim 2, characterized in that: The auxiliary air extraction system comprises a second vacuum pump, the second vacuum pump is fixedly connected to the cold box body through a second conduit, and a second electric valve is fixed on the second conduit.

4. The sand stripping system for cold box maintenance of air separation and fractionation device according to claim 3, characterized in that: Two third conduits are fixedly connected between the first conduit and the second conduit, and the two third conduits are arranged between the first electric valves, and the two third conduits are also arranged between the second vacuum pumps, and the two third conduits are arranged at the side ends of the second electric valves, and the third electric valves are fixed on the third conduits.

5. The sand stripping system for cold box maintenance of air separation and fractionation device according to claim 4, characterized in that: The first vacuum pump, the first electric valve, the second vacuum pump, the second electric valve and the third electric valve are electrically connected to the controller respectively.

6. The sand stripping system for cold box maintenance of air separation and fractionation device according to claim 5, characterized in that: The suction rate of the second vacuum pump is lower than that of the first vacuum pump, and the second vacuum pump can be replaced by a fan or other suction equipment.

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