Automatic balancing air supply device based on deep cooling air separation

Abstract

The utility model discloses an automatic balancing air supply device based on deep cooling air separation. The automatic balancing air supply device comprises a cold box and a control device. An air supply valve and an emptying valve are arranged on the cold box; a product gas flow meter is arranged on the pipeline between the cold box and the gas supply valve; the gas supply valve is used for conveying qualified product gas to a downstream gas using point, and the emptying valve is used for discharging unqualified product gas or excessive product gas to the atmosphere; the product gas flow meter is used for measuring the flow of product gas passing through the gas supply valve; the control device automatically controls the air supply valve and the air release valve to work so as to control the air supply valve and the air release valve to automatically adjust and balance the air quantity out of the cold box when air consumption fluctuation occurs in a downstream workshop, balance in the cold box is prevented from being damaged by the downstream air consumption fluctuation, and therefore it is guaranteed that qualified and stable product air can be available in the downstream workshop; and a long-term stable production plan can be made conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field related to the improvement of the gas supply device of cryogenic air separation, and specifically relates to an automatic balancing gas supply device based on cryogenic air separation, which can automatically adjust the gas supply valve and the vent valve to balance the gas volume out of the cold box when the gas consumption in the downstream workshop fluctuates, so as to avoid the balance in the cold box being destroyed due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop can have qualified and stable product gas available, and facilitating the formulation of a long-term and stable production plan. Background Art

[0002] At the end of the cryogenic air separation process, a gas supply valve and a vent valve are usually installed at the product gas outlet of the cold box. The gas supply valve is used to control the delivery of qualified product gas to the downstream gas consumption point, and the vent valve is used to discharge unqualified product gas or excess product gas into the atmosphere. In actual production, due to the process requirements of the downstream gas consumption point, its gas consumption often fluctuates or is pulsed, which will cause the cooling balance established after debugging in the cold box to be broken, resulting in the deterioration of the purity of the product gas, which usually requires several hours of re-purification. In the worst case, it will cause the downstream workshop to have no gas available for a period of time, wasting a lot of electricity and causing losses to the company. In serious cases, it may cause damage to raw materials or equipment in the production process of the downstream workshop, resulting in major production accidents.

[0003] To this end, we have developed an automatic balancing gas supply device based on cryogenic air separation, which can automatically adjust the gas supply valve and vent valve to balance the gas output of the cold box when the gas consumption in the downstream workshop fluctuates, so as to avoid the balance in the cold box being disrupted by the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop has qualified and stable product gas available, and facilitating the formulation of long-term and stable production plans. Summary of the invention

[0004] The utility model aims to provide an automatic balancing gas supply device based on cryogenic air separation, which can automatically adjust the gas supply valve and the vent valve to balance the gas volume out of the cold box when the gas consumption in the downstream workshop fluctuates, so as to avoid the balance in the cold box being destroyed due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop has qualified and stable product gas available, and facilitating the formulation of a long-term and stable production plan.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automatic balanced gas supply device based on cryogenic air separation, comprising a cold box and a control device; a gas supply valve and a vent valve are arranged on the cold box; a product gas flow meter is arranged on the pipeline between the cold box and the gas supply valve; the gas supply valve is used to transport qualified product gas to downstream gas usage points, and the vent valve is used to discharge unqualified product gas or excess product gas into the atmosphere; the product gas flow meter is used to measure the product gas flow through the gas supply valve; the control device automatically controls the operation of the gas supply valve and the vent valve to achieve automatic adjustment of the gas supply valve and the vent valve when the gas consumption in the downstream workshop fluctuates, so as to balance the gas volume out of the cold box and avoid destroying the balance in the cold box due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop has qualified and stable product gas available, which is convenient for formulating long-term and stable production plans.

[0006] Preferably, in the automatic balancing gas supply device based on cryogenic air separation, when the product gas flow rate is less than the set value, and when the valve opening of the gas supply valve is less than 100%, the control device controls the valve opening of the gas supply valve to increase until a balance is reached; when the product gas flow rate is less than the set value, and when the valve opening of the gas supply valve is 100%, the control device controls the valve opening of the vent valve to increase until a balance is reached; when the product gas flow rate is greater than the set value, and when the valve opening of the vent valve is greater than 0%, the control device controls the valve opening of the vent valve to decrease until a balance is reached; when the product gas flow rate is greater than the set value, and when the valve opening of the vent valve is 0%, the control device controls the valve opening of the gas supply valve to decrease until a balance is reached.

[0007] Compared with the prior art, the utility model provides an automatic balanced gas supply device based on cryogenic air separation, which has the following beneficial effects:

[0008] The automatic balancing gas supply device based on cryogenic air separation described in the utility model can automatically adjust the gas supply valve and the vent valve when the gas consumption in the downstream workshop fluctuates, so as to balance the gas volume out of the cold box and avoid the balance in the cold box being destroyed due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop can have qualified and stable product gas available, which is convenient for formulating long-term and stable production plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0010] Figure 1 This is a schematic diagram of an automatic balanced gas supply device based on cryogenic air separation proposed by the utility model;

[0011] Figure 2This is a working principle diagram of an automatic balanced gas supply device based on cryogenic air separation proposed by the utility model;

[0012] In the figure: 1. Cold box; 2. Air supply valve; 3. Vent valve; 4. Product gas flow meter; 5. Control device. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0014] See also Figure 1-2 The utility model provides a technical solution: an automatic balanced gas supply device based on cryogenic air separation, comprising a cold box 1 and a control device 5; a gas supply valve 2 and a vent valve 3 are arranged on the cold box 1; a product gas flow meter 4 is arranged on the pipeline between the cold box 1 and the gas supply valve 2; the gas supply valve 2 is used to transport qualified product gas to the downstream gas consumption point; the vent valve 3 is used to discharge unqualified product gas or excess product gas into the atmosphere; the product gas flow meter 4 is used to measure the product gas flow passing through the gas supply valve 2; the control device 5 automatically controls the operation of the gas supply valve 2 and the vent valve 3, so as to realize that when the gas consumption in the downstream workshop fluctuates, the gas supply valve and the vent valve are automatically adjusted to balance the gas volume out of the cold box, so as to avoid the destruction of the balance in the cold box due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop can have qualified and stable product gas available, which is convenient for formulating a long-term and stable production plan.

[0015] During operation, when the product gas flow rate is less than the set value, and when the valve opening of the air supply valve 2 is less than 100%, the control device 5 controls the valve opening of the air supply valve 2 to increase until a balance is reached; when the product gas flow rate is less than the set value, and when the valve opening of the air supply valve 2 is 100%, the control device 5 controls the valve opening of the vent valve 3 to increase until a balance is reached; when the product gas flow rate is greater than the set value, and when the valve opening of the vent valve 3 is greater than 0%, the control device 5 controls the valve opening of the vent valve 3 to decrease until a balance is reached; when the product gas flow rate is greater than the set value, and when the valve opening of the vent valve 3 is 0%, the control device 5 controls the valve opening of the air supply valve 2 to decrease until a balance is reached.

[0016] Example 1: Assume that the product gas flow rate is 4500L / H and the set value is 5000L / H; if the valve opening of the air supply valve 2 is less than 100%, the control device 5 controls the valve opening of the air supply valve 2 to increase until a balance is reached; if the valve opening of the air supply valve 2 is 100%, the control device 5 controls the valve opening of the vent valve 3 to increase until a balance is reached.

[0017] Example 2: Assume that the product gas flow rate is 5000L / H and the set value is 4500L / H; if the valve opening of the vent valve 3 is greater than 0%, the control device 5 controls the valve opening of the vent valve 3 to decrease until a balance is reached; if the valve opening of the vent valve 3 is 0%, the control device 5 controls the valve opening of the supply valve 2 to decrease until a balance is reached.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The automatic balancing gas supply device based on cryogenic air separation described in the utility model can automatically adjust the gas supply valve and the vent valve when the gas consumption in the downstream workshop fluctuates, so as to balance the gas volume out of the cold box and avoid the balance in the cold box being destroyed due to the fluctuation of the downstream gas consumption, thereby ensuring that the downstream workshop can have qualified and stable product gas available, which is convenient for formulating long-term and stable production plans.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic balanced gas supply device based on cryogenic air separation, characterized in that: It includes a cold box and a control device; the cold box is provided with a gas supply valve and a vent valve; a product gas flow meter is provided on the pipeline between the cold box and the gas supply valve; the gas supply valve is used to transport qualified product gas to the downstream gas use point, and the vent valve is used to discharge unqualified product gas or excess product gas into the atmosphere; The product gas flow meter is used to measure the product gas flow through the gas supply valve; the control device automatically controls the operation of the gas supply valve and the vent valve to achieve automatic adjustment of the gas supply valve and the vent valve when the gas consumption in the downstream workshop fluctuates, so as to balance the gas volume out of the cold box and avoid the balance in the cold box being destroyed due to fluctuations in the downstream gas consumption, thereby ensuring that the downstream workshop has qualified and stable product gas available, which is convenient for formulating long-term and stable production plans.

2. The automatic balanced gas supply device based on cryogenic air separation according to claim 1 is characterized in that: When the product gas flow rate is less than the set value and when the valve opening of the air supply valve is less than 100%, the control device controls the valve opening of the air supply valve to increase until a balance is reached; when the product gas flow rate is less than the set value and when the valve opening of the air supply valve is 100%, the control device controls the valve opening of the vent valve to increase until a balance is reached; when the product gas flow rate is greater than the set value and when the valve opening of the vent valve is greater than 0%, the control device controls the valve opening of the vent valve to decrease until a balance is reached; when the product gas flow rate is greater than the set value and when the valve opening of the vent valve is 0%, the control device controls the valve opening of the air supply valve to decrease until a balance is reached.

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