Recovery device for air discharged from liquid oxygen storage tank

Abstract

The utility model relates to the technical field of liquid oxygen related equipment, in particular to a liquid oxygen storage tank vent gas recovery device which comprises a liquid oxygen storage tank, the liquid oxygen storage tank is sequentially connected with a steam heater, a buffer tank, a piston oxygen compressor and an oxygen pipe network through pipelines, and return valves are arranged on the pipelines on the two sides of the piston oxygen compressor in parallel. The temperature measuring points are distributed on a pipeline between the steam heater and the buffer tank, and a stop valve is arranged between the steam heater and the buffer tank for interlocking; and the pressure measuring points are arranged on the pipeline between the buffer tank and the piston oxygen compressor. According to the utility model, the emptied oxygen is recovered and re-pressurized and then is fed into the oxygen pipe network for the iron-making blast furnace to use, and the return valve is arranged to ensure that the oxygen before being input into the piston oxygen compressor reaches a certain pressure, so that the risk that the normal-pressure storage tank is pumped and held down is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid oxygen related equipment technical field especially relates to a liquid oxygen storage tank emptying gas recovery device. BACKGROUND

[0002] Normal pressure storage tank is maintained simple, simple structure, low cost is put into more and more in the production, but because its working pressure is lower, a part of liquid product will vaporize, in order to guarantee the safety of storage tank, the product after vaporization can only be discharged, this problem is all the low pressure storage tank use process must face the embarrassing problem, the gaseous product discharged its purity reached the product industrial oxygen requirement, this leads to the waste of great resources, energy waste. In addition, the existing technology exists through the compressor and recycles liquid oxygen and re-enters oxygen pipe network, however, when the oxygen pressure of normal pressure storage tank emptying discharge reduces, the risk of pumping normal pressure storage tank appears. UTILITY MODEL CONTENTS

[0003] The utility model aims at solving above-mentioned defect, provides a kind of liquid oxygen storage tank emptying gas recovery device.

[0004] In order to overcome the defect in the background art, the technical scheme adopted by the utility model to solve its technical problems is: a kind of liquid oxygen storage tank emptying gas recovery device, including liquid oxygen storage tank, it is connected with vapor heater, buffer tank, piston oxygen compressor and oxygen pipe network in proper order by pipeline, backflow valve is arranged on the pipeline of the two sides of piston oxygen compressor;

[0005] Temperature measuring point is arranged on the pipeline between vapor heater and buffer tank, cut-off valve interlock is arranged between vapor heater and buffer tank.

[0006] Pressure measuring point is arranged on the pipeline between buffer tank and piston oxygen compressor.

[0007] Further improvement, including that vapor heater is connected with steam source and circulating water pool by pipeline respectively.

[0008] Further improvement, including that check valve is arranged in series on the pipeline between piston oxygen compressor and oxygen pipe network.

[0009] Further improvement, including that safety valve is arranged on buffer tank.

[0010] Further improvement, including that sending valve is arranged in series on the pipeline between piston oxygen compressor and oxygen pipe network.

[0011] The utility model discloses beneficial effect is: this design is through the empty oxygen recovery and re -pressurization after sending into oxygen pipe network for blast furnace of smelting iron, and through setting backflow valve to ensure that the oxygen before input piston oxygen compressor reaches certain pressure, avoid the risk of pumping the normal pressure storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model is further illustrated below in combination with the drawings and examples.

[0013] Figure 1 It is the front view of the utility model;

[0014] In the drawing, 1 is liquid oxygen storage tank, 2 is circulating water pool, 3 is steam heater, 4 is steam source, 5 is temperature measuring point, 6 is cut-off valve, 7 is buffer tank, 8 is safety valve, 9 is pressure measuring point, 10 is backflow valve, 11 is piston oxygen compressor, 12 is check valve, 13 is sending valve, 14 is oxygen pipe network. DETAILED DESCRIPTION

[0015] To make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, and obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. The embodiment in the basic utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of protection of the utility model.

[0016] As Figure 1 Shown, a kind of liquid oxygen storage tank emptying recovery device, including liquid oxygen storage tank 1, it is sequentially connected with steam heater 3, buffer tank 7, piston oxygen compressor 11 and oxygen pipe network 14 by pipeline, backflow valve 10 is arranged on the pipeline of both sides of the piston oxygen compressor 11 in parallel;

[0017] Temperature measuring point 5, it is arranged on the pipeline between the steam heater 3 and the buffer tank 7, for detecting the temperature of low-temperature oxygen, it is interlocked with the piston oxygen compressor 11, when the temperature detected is low, piston oxygen compressor 11 then will be stopped, at the same time, the cut-off valve 6 interlocked that is arranged between the piston oxygen compressor 11 and the steam heater 3 and the buffer tank 7, when piston oxygen compressor 11 stops, cut-off valve 6 can be closed, prevent high-pressure oxygen from being reversed to liquid oxygen storage tank 1, cause liquid oxygen storage tank 1 overpressure;

[0018] Pressure measuring point 9 is arranged on the pipeline between the buffer tank 7 and the piston oxygen compressor 11, and is used for detecting the liquid oxygen pressure in the pipeline between the buffer tank 7 and the piston oxygen compressor 11; then the backflow valve 8 of the piston oxygen compressor 7 is opened to ensure that the pressure measuring point 17 is stable, thereby ensuring the safety of the pressure in the liquid oxygen tank 1, and avoiding the risk of pumping the liquid oxygen tank 1.

[0019] In the embodiment, the steam heater 3 is connected with the steam source 4 and the circulating water pool 2 through pipelines respectively, the steam source 4 inputs steam into the steam heater 3, the low-temperature oxygen is firstly naturally heat-exchanged with the ambient air to be warmed, and then enters the steam heater 3 to be warmed again by heat exchange with steam, so that the ambient air can be fully utilized to warm the low-temperature oxygen, and the temperature of the low-temperature oxygen entering the steam heater 3 is close to normal temperature, the use of the steam heater 3 can reduce the heat exchange area, save the investment cost of the heat exchanger and the steam consumption, and after the 0.6MPa steam is heat-exchanged with the low-temperature oxygen in the steam heater 3 to generate steam condensate water, the steam condensate water enters the circulating water pool 2 for production, thereby forming a steam condensate water recycling zero-waste system.

[0020] In the embodiment, the check valve 12 is arranged in series on the pipeline between the piston oxygen compressor 11 and the oxygen pipe network 14, so as to prevent the oxygen in the 0.8MPa oxygen pipe network 14 from flowing back after the piston oxygen compressor 11 stops, and the check valve 12 is automatically closed to prevent the oxygen from flowing back if the piston oxygen compressor 11 stops.

[0021] In the embodiment, the safety valve 8 is arranged on the buffer tank 7 to prevent the oxygen from flowing back due to the internal leakage of the check valve 12 after the piston oxygen compressor 11 stops, and the safety valve 8 is automatically discharged to ensure the safety of the system if the pressure of the buffer tank 7 increases.

[0022] In the embodiment, the delivery valve 13 is arranged in series on the pipeline between the piston oxygen compressor 11 and the oxygen pipe network 14, and the delivery valve 13 is used to open and close the pipeline of the entire device.

[0023] Working principle: The oxygen in the liquid oxygen tank 1 is input into the steam heater 3 through a pipeline, the oxygen is naturally heat-exchanged with the ambient air in the pipeline to be warmed, i.e. close to normal temperature, and then enters the steam heater 3 to be warmed again by heat exchange with steam, and then enters the buffer tank 7, and then enters the piston oxygen compressor 11 to be compressed, and the liquid oxygen after being compressed is input into the oxygen pipe network 14.

[0024] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, and any skilled person in the art can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A liquid oxygen tank vent gas recovery apparatus, characterized by, The liquid oxygen tank (1) is connected with a vapor heater (3), a buffer tank (7), a piston oxygen compressor (11) and an oxygen pipe network (14) through pipelines in sequence, and backflow valves (10) are arranged in parallel on the pipelines at both sides of the piston oxygen compressor (11); A temperature measuring point (5) is arranged on the pipeline between the vapor heater (3) and the buffer tank (7), and a cut-off valve (6) is arranged between the vapor heater (3) and the buffer tank (7) for interlocking. A pressure measuring point (9) is arranged on the pipeline between the buffer tank (7) and the piston oxygen compressor (11).

2. A liquid oxygen tank vent gas recovery apparatus as claimed in claim 1, wherein: The vapor heater (3) is connected with a steam source (4) and a circulating water pool (2) through pipelines.

3. A liquid oxygen tank vent gas recovery apparatus as claimed in claim 1, wherein: Check valves (12) are arranged in series on the pipeline between the piston oxygen compressor (11) and the oxygen pipe network (14).

4. A liquid oxygen tank vent gas recovery apparatus as claimed in claim 3, wherein: A safety valve (8) is arranged on the buffer tank (7).

5. A liquid oxygen tank vent gas recovery apparatus as claimed in claim 1, wherein: Delivery valves (13) are arranged in series on the pipeline between the piston oxygen compressor (11) and the oxygen pipe network (14).

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