JP2014065619A - Oxygen gas supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxygen gas supply system with which oxygen gas is suitably supplied corresponding to the oxygen gas usage status of a demander as the oxygen gas supply system for a case in which one intermittently using oxygen gas such as a steel converter is included in demanders.SOLUTION: In an oxygen gas supply system, an oxygen gas generation amount in an oxygen gas generation apparatus 1 and a liquid oxygen storage amount and a liquid oxygen vaporization amount in an oxygen gas liquefaction and storage apparatus 5 are adjusted by using oxygen usage information consisting of a raw material charge signal synchronizing with raw material charge and a blow start signal synchronizing with start of blowing in a steel converter 11 operated according to a series of steps.

Description

  The present invention relates to an oxygen gas supply system used in steelworks or the like.

  The amount of oxygen gas used (demand) when a converter (such as a shaft furnace) that performs intermittent operation or a similar furnace (for example, a shaft furnace) is included in the user (demand) at a steelworks, etc. Fluctuates greatly due to operating conditions (operational conditions).

  The fluctuation in the amount of oxygen gas used (demand amount) is absorbed by the oxygen gas holder that temporarily stores the oxygen gas supplied from the oxygen gas generator (raw material air compressor, air separator). The supply amount of oxygen gas is smoothed.

  Therefore, for example, when the converter is blown and oxygen gas is used, the amount of oxygen gas in the oxygen gas holder decreases, the pressure in the oxygen gas holder decreases, and conversely, the converter is blown. If not, the amount of oxygen gas in the oxygen gas holder increases and the pressure in the oxygen gas holder rises.

  However, since the pressure control value of the oxygen gas holder has an upper limit value, for example, when the converter is not blown, the amount of oxygen gas generated in the air separator is temporarily reduced, and the oxygen gas holder Suppresses pressure rise.

  On the other hand, since there is a lower limit of the oxygen gas pressure required at the user (demand), for example, when the converter is being blown, the amount of oxygen gas generated in the air separator is temporarily increased. Thus, the pressure drop of the oxygen gas is suppressed. However, when the pressure drop of oxygen gas cannot be suppressed only by increasing the amount of oxygen gas generated in the air separator, the shortage of oxygen gas supply is replenished by vaporizing liquid oxygen stored separately.

  In such an oxygen gas supply system, when the decrease in the amount of oxygen gas generated in the air separator is not in time, the pressure of the oxygen gas holder reaches the upper limit value, and excess oxygen gas is released into the atmosphere. On the other hand, when the increase in the amount of oxygen gas generated in the air separator is not in time, or when the amount of oxygen gas used is large, the replenishment amount of liquid oxygen increases.

  As a method of adjusting the supply amount of oxygen gas according to the amount of oxygen gas used (demand amount), a method for predicting and displaying the oxygen gas holder pressure based on the predicted oxygen gas demand amount and the predicted oxygen gas generation amount (patent) Document 1) and a method of suppressing surplus oxygen gas emission by mixing surplus oxygen gas into the material air on the outlet side of the material air compressor (Patent Document 2).

JP 2006-2958 A JP-A-5-34061

  However, in the method as disclosed in Patent Document 1, depending on the operation state of the converter or the like, there is a difference between the predicted oxygen gas usage amount and the actual oxygen gas usage amount, and the predicted oxygen gas holder pressure value based on the blowing schedule. There is a problem that the actual oxygen gas holder pressure change deviates from that, and oxygen gas is released into the atmosphere and the vaporized supply amount of liquid oxygen is generated due to the difference.

  Further, in the method as disclosed in Patent Document 2, since the total flow rate of the raw material intake flow rate and the surplus oxygen gas mixed flow rate cannot be changed rapidly, there is a limit in the amount of atmospheric oxygen gas that can be suppressed.

  This invention is made | formed in view of the above situations, and uses oxygen gas of a customer as an oxygen gas supply system in the case of including in the customer who uses oxygen gas intermittently like a converter etc. An object of the present invention is to provide an oxygen gas supply system that can supply oxygen gas appropriately according to the situation.

  In order to solve the above problems, the present invention has the following features.

  [1] An oxygen gas supply system in the case of including a customer who uses oxygen gas intermittently, an oxygen gas generator, an oxygen gas holder for temporarily storing oxygen gas from the oxygen gas generator, oxygen Oxygen gas from the gas generator liquefied and stored, oxygen gas liquefied storage device that vaporizes and replenishes the liquefied oxygen when the supply amount of oxygen gas is insufficient, and to the customer based on the oxygen usage information of the customer An oxygen gas supply system comprising: an oxygen gas supply control device that controls an oxygen gas supply amount of the gas.

  [2] The oxygen gas supply system according to [1], wherein the oxygen gas supply control device increases or decreases the amount of oxygen gas generated from the oxygen gas generator based on oxygen usage information of a demand destination. .

  [3] The oxygen gas supply control device increases or decreases the storage amount and vaporization amount of liquid oxygen in the oxygen gas liquefaction storage device based on the oxygen usage information of the demand destination, and leveles the fluctuation of the oxygen gas supply amount. The oxygen gas supply system according to [1] or [2], wherein

  [4] The oxygen gas supply system according to any one of [1] to [3], wherein a demand destination that intermittently uses oxygen gas is a converter.

  [5] The oxygen usage information according to [4], wherein oxygen usage information including a raw material charging signal and a blowing start signal in a converter operated in accordance with a series of processes is used as the oxygen usage information of a customer. Gas supply system.

  [6] The oxygen gas supply system according to [5], wherein an operation signal of an explosion-proof shutter in a converter is used as a raw material charging signal.

  In the present invention, since the oxygen gas supply amount to the customer is controlled based on the oxygen usage information of the customer, the oxygen gas can be appropriately supplied according to the oxygen gas usage situation of the customer. .

It is a figure which shows the oxygen gas supply system in one Embodiment of this invention. It is a figure which shows the change of the oxygen gas pressure, etc. in one Embodiment of this invention. It is a figure which shows the change of oxygen gas generation amount and oxygen liquefaction amount, and vaporization amount in one Embodiment of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an oxygen gas supply system according to an embodiment of the present invention.

  As shown in FIG. 1, the oxygen gas supply system in this embodiment includes a converter 11 (No. 1 converter, No. 2 converter) that uses oxygen gas intermittently as a demand destination 10 for oxygen gas. A blast furnace 12 that continuously uses oxygen gas is provided. The oxygen gas generator 1, the oxygen gas holder 4 that temporarily stores the oxygen gas from the oxygen gas generator 1, and the oxygen gas generator 1 Oxygen gas liquefied and stored, oxygen gas liquefied storage device 5 that vaporizes and replenishes liquefied oxygen when the supply amount of oxygen gas is insufficient, and supply of oxygen gas to customers based on oxygen usage information of customers And an oxygen gas supply control device (not shown) for controlling the amount.

  The oxygen gas generator 1 includes a raw material air compressor 2 and an air separator 3. The oxygen gas liquefaction storage device 5 includes an oxygen liquefaction device 6 for liquefying oxygen gas, a liquid oxygen storage tank 7 for liquefied liquid oxygen, a pumping pump 8, and an oxygen vaporization device 9 for vaporizing liquid oxygen. Yes.

  2 (a) shows the temporal transition of the pressure of the oxygen gas holder 4, FIG. 2 (b) shows the blowing schedule in the converter 11 (No. 1 converter, No. 2 converter), FIG. 2 (c). ) Shows the time transition of the oxygen gas generation amount in the oxygen gas generator 1 (air separator 3), and FIG. Fig. 3 (a) shows a series of work steps in one blowing (raw material charging, start of blowing, blowing (in use of oxygen)), Fig. 3 (b) shows an air separator in one blowing. 3 shows the time transition of the oxygen gas generation amount in FIG. 3, and FIG. 3 (c) shows the time transition of the oxygen liquefaction amount in the oxygen gas liquefaction storage device 5 in one blowing. Incidentally, in FIG. 2A, the broken line indicates the case where the oxygen gas supply control according to this embodiment is not performed, and the solid line indicates the case where the oxygen gas supply control according to this embodiment is performed.

  As shown in FIGS. 2 and 3, in this oxygen gas supply system, in the converter 11 operated according to a series of processes, the raw material charging signal synchronized with the raw material charging and the start of blowing are synchronized. The oxygen use information formed from the blowing start signal is used to adjust the oxygen gas generation amount of the oxygen gas generator 1 and the liquid oxygen storage amount / vaporization amount of the oxygen gas liquefaction storage device 5.

  That is, the operation signal of the explosion-proof shutter operated according to the raw material charging is used as the raw material charging signal, and the oxygen gas generation amount of the oxygen gas generator 1 is determined based on the raw material charging signal (oxygen use start notice signal). By adjusting so that the amount of liquid oxygen stored in the oxygen gas liquefaction storage device 5 is increased, an increase in the pressure level of the oxygen gas holder 4 before blowing can be suppressed. As a result, the diffusion of oxygen gas due to the pressure level of the oxygen gas holder 4 reaching the upper limit value can be reduced.

  Since the oxygen gas generation amount of the oxygen gas generator 1 is maintained at an increased value based on the subsequent blowing start signal, the oxygen gas pressure during blowing due to the delay in adjusting the oxygen gas supply amount Can be suppressed. As a result, the replenishment amount with liquid oxygen can be reduced.

  More specifically, as shown in FIG. 3, an increase in the amount of oxygen generated from the air separator 3 is started based on the raw material charging information (oxygen use start notice information) before the start of blowing. Further, by increasing the oxygen liquefaction amount by operating the oxygen gas liquefaction storage device 5 in response to an increase in the pressure level of the oxygen gas holder 4 at that time, the pressure of the oxygen gas holder 4 increases with the increase in the amount of oxygen gas generated. Suppress the speed. Thereafter, oxygen liquefaction is stopped simultaneously with the blowing start information, the amount of oxygen supplied to the customer is increased, and a decrease in oxygen gas pressure during the blowing is suppressed.

  As described above, the oxygen gas pressure level when the blowing is performed and when it is not performed is set within the control value by increasing or decreasing the oxygen generation amount from the air separator 3 or the oxygen liquefaction amount in the oxygen gas liquefaction storage device 5. Thus, it is possible to reduce the amount of oxygen diffused by exceeding the pressure upper limit and the amount of oxygen vaporization by falling below the pressure lower limit.

  Thus, in this embodiment, in a series of operation processes in the converter plant 11, the oxygen use start information is created based on the operation signal of the explosion-proof shutter operated in accordance with the raw material charging, so that the blowing is performed. Oxygen gas supply from the oxygen gas generator 1 before the start of blowing by eliminating the adjustment of the supply amount of oxygen gas due to the difference between the schedule and the actual blowing and ensuring the allowance until the start of oxygen use Increase the amount to suppress the decrease in oxygen gas pressure during blowing (using oxygen).

  In other words, in this embodiment, an operation signal for starting and ending raw material charging and starting blowing is acquired based on the explosion-proof shutter signal in the converter plant 11, and the intake amount of the raw material air compressor 2 is controlled based on the signal. Thus, an increase in the amount of oxygen generated until the start of blowing and adjustment of the supply amount of oxygen gas in synchronization with the start of blowing are performed, thereby making it possible to suppress the pressure rise and fall of the oxygen gas holder 4.

  Moreover, in addition to the intake air amount control of the raw material air compressor 2 described above, by adding the storage amount control of liquid oxygen, rapid fluctuations in oxygen gas demand that cannot be accommodated by the intake air amount control of the raw material air compressor 2 are achieved. It absorbs and the pressure rise of the oxygen gas holder 4 can be suppressed.

  In this way, in this embodiment, since the raw material charging information and the blowing start signal of the converter 11 are taken in and used as the intake amount control of the raw material air compressor 2, the actual operation of the converter 11 is performed. It became possible to adjust the supply amount of oxygen gas in synchronization with the state and increase the amount of oxygen gas generated until the start of blowing. Further, by adding liquefied storage amount control of surplus oxygen gas, it has become possible to adjust the supply amount of oxygen gas that can cope with rapid fluctuations in oxygen usage that cannot be handled by the intake air amount control of the raw air compressor 2. .

  In the above-described embodiment, the converter is targeted as a demand destination that uses oxygen gas intermittently, but the same applies to a furnace similar to the converter (for example, a shaft furnace). be able to.

DESCRIPTION OF SYMBOLS 1 Oxygen gas generator 2 Raw material air compressor 3 Air separator 4 Oxygen gas holder 5 Oxygen gas liquefying storage device 6 Oxygen liquefying device 7 Liquid oxygen storage tank 8 Pressure pump 9 Oxygen vaporizer 10 Oxygen gas customer 11 Converter 12 Blast furnace

Claims (6)

  An oxygen gas supply system in the case of including a customer who uses oxygen gas intermittently, an oxygen gas generator, an oxygen gas holder for temporarily storing oxygen gas from the oxygen gas generator, and an oxygen gas generator Liquefied and stored oxygen gas from the storage, oxygen gas liquefied storage device to vaporize and replenish the liquefied oxygen when the oxygen gas supply amount is insufficient, and oxygen gas to the customer based on the oxygen usage information of the customer An oxygen gas supply system comprising an oxygen gas supply control device for controlling a supply amount.   2. The oxygen gas supply system according to claim 1, wherein the oxygen gas supply control device increases or decreases the amount of oxygen gas generated from the oxygen gas generator on the basis of the oxygen usage information of the customer.   The oxygen gas supply control device is characterized by leveling fluctuations in the oxygen gas supply amount by increasing / decreasing the storage amount and vaporization amount of liquid oxygen in the oxygen gas liquefaction storage device based on the oxygen usage information of the customer. The oxygen gas supply system according to claim 1 or 2.   The oxygen gas supply system according to any one of claims 1 to 3, wherein a demander that uses oxygen gas intermittently is a converter.   5. The oxygen gas supply system according to claim 4, wherein oxygen usage information including a raw material charging signal and a blowing start signal in a converter operated according to a series of steps is used as the oxygen usage information of a demand destination.   6. The oxygen gas supply system according to claim 5, wherein an operation signal of an explosion-proof shutter in the converter is used as the raw material charging signal.

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