Liquid oxygen reverse filling main cooling device of air separation equipment

Abstract

The utility model relates to a liquid oxygen reverse-filling main cooling device of air separation equipment, which comprises a liquid oxygen storage tank. The front end of the liquid oxygen pipeline I is connected with the liquid oxygen storage tank, the rear end of the liquid oxygen pipeline I is connected with a liquid oxygen vehicle, and a vehicle filling pump, a valve I and a valve II are arranged on the liquid oxygen pipeline I; the front end of the liquid oxygen pipeline II is connected with the liquid oxygen storage tank, the rear end of the liquid oxygen pipeline II is used for being connected with an air separation plant cold box, and a valve III and a valve IV are arranged on the liquid oxygen pipeline II; the branch pipe I is located between the liquid oxygen pipeline I and the liquid oxygen pipeline II, and a valve V is installed on the branch pipe I; the branch pipe II is located between the branch pipe I and the liquid oxygen pipeline II, and a valve VI is arranged on the branch pipe II. According to the device, an existing liquid oxygen storage tank in a plant is subjected to technical transformation, the liquid oxygen reverse filling function can be achieved only by additionally arranging a valve and a branch pipeline on an outlet pipeline of the liquid oxygen storage tank, main equipment does not need to be replaced, the liquid oxygen in the liquid oxygen storage tank is directly subjected to reverse filling to main cooling, the traditional liquid accumulation process needing more than 20 hours can be shortened to be within several hours, and the efficiency is improved. And the equipment starting efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air separation equipment technical field, concretely is a kind of air separation equipment liquid oxygen backfill main cold device. BACKGROUND

[0002] In the process of air separation equipment starting-up accumulation liquid, the cold energy of expander is used to liquefy air to meet the low-temperature liquid required by main cold heat exchange, and the time of accumulating low-temperature liquid generally accounts for more than half of the total starting-up time of air separation equipment (about 20 hours). This accumulation process is a process of consumption without product output, and energy is wasted seriously.

[0003] Although there is an operation method of using self-pressurized liquid oxygen tank to pressurize and backfill main cold in early stage, with the large-scale of air separation equipment, the low-temperature liquid oxygen tank generally provided is a flat-bottom atmospheric low-temperature liquid oxygen tank, which does not have the ability to backfill main cold by self-pressurization. To this end, in order to shorten the starting-up time of air separation equipment by using the low-temperature liquid oxygen stored during normal production of air separation equipment, technical improvement needs to be made to the existing equipment to meet the production requirements. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problems of the prior art, and provides an air separation equipment liquid oxygen backfill main cold device, which uses the existing liquid oxygen in the liquid oxygen tank to backfill into the cold box of the air separation equipment through a pipeline and a valve during the starting-up of the air separation equipment, so that the liquid accumulation time required during the starting-up of the air separation equipment is greatly shortened.

[0005] The technical problems solved by the utility model are solved by the following technical solutions. An air separation equipment liquid oxygen backfill main cold device comprises a liquid oxygen tank for supplying liquid oxygen to a cold box of an air separation equipment, and the liquid oxygen tank is provided with:

[0006] A liquid oxygen pipeline I has its front end connected to the liquid oxygen tank and its rear end connected to a liquid oxygen vehicle, and a charging vehicle pump, a valve I and a valve II are sequentially arranged on the liquid oxygen pipeline I from the front end to the rear end.

[0007] A liquid oxygen pipeline II has its front end connected to the liquid oxygen tank and its rear end connected to the cold box of the air separation equipment, and a valve III and a valve IV are sequentially arranged on the liquid oxygen pipeline II from the front end to the rear end.

[0008] A branch pipe I has its front end connected to the liquid oxygen pipeline I between the valve I and the valve II and its rear end connected to the liquid oxygen pipeline II between the valve III and the valve IV, and a valve V is installed on the branch pipe I.

[0009] A branch pipe II has one end connected to the branch pipe I between the front end of the branch pipe I and the valve V and the other end connected to the liquid oxygen pipeline II between the front end of the liquid oxygen pipeline II and the valve III, and a valve VI is installed on the branch pipe II.

[0010] The technical problems to be solved by the utility model can also be implemented by the following technical scheme, the above-mentioned air separation equipment liquid oxygen backfill main cooling device, the valve I, the valve II, the valve III, the valve IV, the valve V and the valve VI are all stop valves.

[0011] Compared with the prior art, the utility model has the beneficial technical effects that:

[0012] (1) the device utilizes the existing liquid oxygen storage tank in the factory for technical transformation, only needs to install the valve and branch pipeline at the liquid oxygen storage tank outlet pipeline to realize the liquid oxygen backfill function, does not need to replace the main equipment, directly backfills the liquid oxygen in the liquid oxygen storage tank to the air separation equipment cold box, can shorten the traditional liquid accumulation process of more than 20 hours to several hours, greatly improves the equipment starting efficiency, completely changes the traditional slow starting mode depending on the expansion machine refrigeration and natural liquid accumulation, simultaneously avoids the transportation coordination, cost fluctuation and other problems caused by the rented tank car and purchased liquid oxygen, has strong practicality and economy;

[0013] (2) the device can shorten the air separation equipment starting liquid accumulation time by 20 hours, taking 35000m³ / h air separation equipment as an example, the economic benefit generated by single starting is: saving electricity fee about (16500+355+100+650)kW*0.8*20h*0.6 yuan / kWh=169008 yuan, deducting the 30 tons of liquid oxygen cost (30 tons*300 yuan / ton=9000 yuan) consumed by backfilling, significantly reflects the foreseeable technical advantages and economic value after the device is implemented, and has strong practicality. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the front view structural schematic diagram of the utility model.

[0015] Reference signs: 1, air separation equipment cold box;2, liquid oxygen storage tank;3, liquid oxygen pipeline I;4, charging pump;5, valve I;6, valve II;7, liquid oxygen pipeline II;8, valve III;9, valve IV;10, branch pipe I;11, valve V;12, branch pipe II;13, valve VI. DETAILED DESCRIPTION

[0016] The specific technical scheme of the utility model is further described below with reference to the drawings, so that the person skilled in the art can further understand the utility model, and it does not constitute a limitation on its rights.

[0017] Example 1, refer to Figure 1The application discloses a liquid oxygen backfill main cooling device for air separation equipment, which comprises a liquid oxygen storage tank 2 for supplying liquid oxygen to a cold box 1 of the air separation equipment, wherein the liquid oxygen storage tank 2 is provided with a liquid oxygen pipeline I 3, a front end of the liquid oxygen pipeline I 3 is connected with the liquid oxygen storage tank 2, and a rear end of the liquid oxygen pipeline I 3 is used for being connected with a liquid oxygen tank car, a backfill pump 4, a valve I 5 and a valve II 6 are sequentially arranged on the liquid oxygen pipeline I 3 from the front end to the rear end, a liquid oxygen pipeline II 7 is provided, a front end of the liquid oxygen pipeline II 7 is connected with the liquid oxygen storage tank 2, and a rear end of the liquid oxygen pipeline II 7 is used for being connected with the cold box 1 of the air separation equipment, a valve III 8 and a valve IV 9 are sequentially arranged on the liquid oxygen pipeline II 7 from the front end to the rear end, a branch pipeline I 10 is connected to the liquid oxygen pipeline I 3 between the valve I 5 and the valve II 6 at a front end and connected to the liquid oxygen pipeline II 7 between the valve III 8 and the valve IV 9 at a rear end, a valve V 11 is arranged on the branch pipeline I 10, a branch pipeline II 12 is connected to the branch pipeline I 10 at one end and located between the front end of the branch pipeline I 10 and the valve V 11, and the other end of the branch pipeline II 12 is connected to the liquid oxygen pipeline II 7 and located between the front end of the liquid oxygen pipeline II 7 and the valve III 8, a valve VI 13 is arranged on the branch pipeline II 12, and the valve I 5, the valve II 6, the valve III 8, the valve IV 9, the valve V 11 and the valve VI 13 are all stop valves.

[0018] The cold box 1 of the air separation equipment and the liquid oxygen storage tank 2 are inherent equipment in a factory area, and the liquid oxygen pipeline I 3 and the liquid oxygen pipeline II 7 are also inherent equipment in the factory area, and only the valve II 6 is additionally arranged on the liquid oxygen pipeline I 3, the branch pipeline I 10 and the branch pipeline II 12 are additionally arranged between the liquid oxygen pipeline I 3 and the liquid oxygen pipeline II 7, and the valve V 11 and the valve VI 13 are arranged on the branch pipeline I 10 and the branch pipeline II 12.

[0019] The specific use principle is as follows:

[0020] When liquid oxygen in the liquid oxygen storage tank 2 is used to start the air separation equipment, the valve II 6, the valve III 8, the valve IV 9, the valve V 11 and the valve VI 13 are all kept closed, the valve VI 13 is opened first, then the valve I 5 is opened, the backfill pump 4 is opened at this time, the valve V 11 is opened after the backfill pump 4 is filled with liquid, and finally the opening degree of the valve VI 13 is selectively adjusted, when the flow of the valve V 11 needs to be increased, the valve VI 13 is closed or the opening degree of the valve VI 13 is adjusted.

[0021] After the device is used, the liquid accumulation time for starting the air separation equipment is shortened by 20 hours, the traditional slow starting mode depending on the expansion machine refrigeration and natural liquid accumulation is changed, and the cost caused by renting a tank car is saved.

Claims

1. A liquid oxygen backfill main cooling device of an air separation device, characterized in that: It includes liquid oxygen storage tank for supplying liquid oxygen to cold box of air separation unit, which is configured with; Liquid oxygen pipeline I, the front end of which is connected with the liquid oxygen storage tank and the rear end of which is used for connecting with liquid oxygen vehicle, a vehicle filling pump, a valve I and a valve II being arranged on the liquid oxygen pipeline I from the front end to the rear end in sequence; Liquid oxygen pipeline II, the front end of which is connected with the liquid oxygen storage tank and the rear end of which is used for connecting with the cold box of air separation unit, a valve III and a valve IV being arranged on the liquid oxygen pipeline II from the front end to the rear end in sequence; Branch pipeline I, the front end of which is connected to the liquid oxygen pipeline I between the valve I and the valve II and the rear end of which is connected to the liquid oxygen pipeline II between the valve III and the valve IV, a valve V being installed on the branch pipeline I; Branch pipeline II, one end of which is connected to the branch pipeline I between the front end of the branch pipeline I and the valve V and the other end of which is connected to the liquid oxygen pipeline II between the front end of the liquid oxygen pipeline II and the valve III, a valve VI being installed on the branch pipeline II.

2. The liquid oxygen backfill main cooling device of the air separation device according to claim 1, characterized in that: The valve I, the valve II, the valve III, the valve IV, the valve V and the valve VI are all stop valves.

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