JPS6121716A - Continuous operation of adsorbing apparatus - Google Patents

Abstract

PURPOSE:To enhance the efficiency of adsorbing treatment, in a method for the continuous operation of an adsorbing apparatus, by providing a densitometer to the stock gas supply port communicated with an adsorbing vessel to calculate the introduction integrated value of an adsorbing component and changing over an adsorbing process to a desorbing process when said integrated value reaches a predetermined value. CONSTITUTION:An adsorbing component densitometer 3 and a flow meter 4 are attached to a stock gas supply line L1 and the measured values are sent to an integrating operator 5 to continuously calculate the introduction integrated value of the adsorbing component supplied to an adsorbing vessel 1a. When the introduction integrated value reaches preset change-over point adsorbing capacity, a signal is sent to a control apparatus 6 and the change-over of the stock gas supply line is performed by the opening and closing of solenoid valves V1-V8 while adsorbing treatment by an adsorbing vessel 1b after a desorbing process is started and regeneration gas is sent to the adsorbing vessel 1a from a regeneration gas line L3 to allow said adsorbing vessel 1a to enter a regeneration process.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method in which a plurality of adsorbers are installed together, at least one adsorber performs adsorption processing, and the other adsorber performs desorption processing. In a method of continuous operation of an adsorption device, in which the adsorption process is carried out as necessary and the adsorption process and desorption process are switched as appropriate, it is possible to obtain a high level of adsorption treatment efficiency by making the best use of the adsorption capacity of each adsorption device. Continuous operation method
It is.

[Conventional technology]

Adsorption is a method for removing certain components (one or more) contained in fluids such as gas, and the basic configuration of a typical adsorption treatment device is shown in Figure 3. It is common knowledge. That is, in FIG. 3, jaslb indicates an adsorber, and the raw material gas supplied from the raw material gas supply line L□ is sent from the pulp vl (or vt) to one of the adsorbers 1a (' or lb) for adsorption treatment. The gas that has been received and processed is sent from the pulp VS (also t-tvt) to the purified gas line L.
1 and then extracted. In parallel with this adsorption process, a desorption process is performed in the other adsorber xb (or la). That is, the regeneration gas is supplied from the regeneration gas line Ls to the pulp Va(
or VS) to the adsorber 1b (or la), and after desorbing the components adsorbed in the previous adsorption step, it is discharged from the valve V, (or V,) via the regeneration gas discharge line L4. By appropriately switching the outputs v1 to v8, adsorption and desorption by the adsorbers 1a and 1b are repeated, so that the entire apparatus continuously performs adsorption and desorption. In this case, it seems best to switch from the adsorption step to the desorption step in accordance with the time when each adsorber reaches its breakthrough point. However, what is currently available is that the time required for each adsorber to reach its breakthrough point is set in advance, depending on the concentration of adsorbed components in the raw material gas, unit time, and the amount of raw material gas supplied per unit time. Then, each valve V1~v
Reference numeral 8 is a solenoid valve, and the timer 2 is configured to automatically perform the above-mentioned switching.

[Problem that the invention seeks to solve]

At first glance, the switching operation method using a solenoid valve and timer as described above seems to be extremely rational, but it has the following drawbacks, so it is difficult to make full use of the processing capacity of each adsorber. It's hard to say. In other words, in the method shown in Figure 3, the adsorption processing time for each cycle is kept constant, but on the other hand, the concentration of adsorbed components in the raw gas is not necessarily constant, so the adsorber reaches the breakthrough point. There is considerable variation in the desired time. If the time required to reach this breakthrough point becomes shorter than the set time, the effect of removing adsorbed components that die at the end of the adsorption process will decrease rapidly, making it impossible to achieve the purpose of purification. . Therefore, it is possible to set the timer operating time within a safe range to avoid such problems, for example, the time required to reach the breakthrough point calculated based on the time when the adsorbed component concentration in the raw material gas reaches its peak value. is the set time. As a result, in actual operation, each adsorber is switched to the desorption process when it still has a considerable adsorption capacity, and the switching operation takes into account an excessive safety factor, so the adsorption capacity of the adsorbent is effectively utilized. It is difficult to say that it is being utilized effectively.

Under these circumstances, the present invention aims to provide a continuous operation method that makes the most effective use of the adsorption capacity of the adsorbent and significantly increases the efficiency of adsorption treatment.

[Means for solving problems]

In the present invention, as shown in FIG. 3, a plurality of adsorbers are installed together, and at least one adsorber performs adsorption processing, while the other adsorbers perform desorption, and the adsorption process and desorption process are performed as appropriate. In a method for continuous operation of an adsorption device that performs process switching, the switching point adsorption capacity is set in advance for each adsorption device, and the fluid to be treated (raw material gas) supply line to each adsorption device is A step in which an adsorbed component concentration measuring device is installed in the inside of the container to measure the concentration of the adsorbed component and an integrated value of the introduced amount of the adsorbed component is calculated, and the integrated value reaches the preset switching point adsorption capacity. The gist of this method is to switch between the adsorption process and the desorption process.

[Effect]

In the present invention, each adsorption capacity (
In other words, the actual saturated adsorption capacity (that is, the breakthrough point) is determined in advance, and the actual saturated adsorption capacity that takes into account a predetermined safety factor below each breakthrough point is set in advance as the switching point adsorption capacity. A device for measuring the concentration of adsorbed components in the fluid is installed in the processing fluid C raw material gas) supply 2-in to measure the concentration of the adsorbed components, and at the same time measure the fluid supply amount using a flowmeter, for example, to measure the amount of adsorbed components. The integrated value of the introduced amount is calculated, and when this integrated value reaches the preset switching point adsorption capacity, the adsorption process is switched to the desorption process. In other words, with this operating method, even if the adsorbed component concentration in the raw material gas or the raw material gas flow rate fluctuates, the integrated value of the introduced amount of adsorbed components supplied to each adsorber can be accurately grasped. It is possible to accurately know when to switch from the adsorption process to the desorption process. Therefore, even if the switching point adsorption capacity of each adsorber is set to the adsorption capacity just before the breakthrough point, there is no risk that the switching timing will be delayed and the adsorption efficiency will decrease, and the adsorption capacity of each adsorber can be adjusted. You can make the most of it. The specific configuration of this operating method will be explained in detail in Examples below, but it goes without saying that the structure of the adsorbers, the number of adsorbers, the piping structure, the position of the valves, etc. can be changed as desired.
The type of adsorbent to be filled into the adsorber may be appropriately selected and determined depending on the type S of the adsorbed component.

〔Example〕

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, and the basic configuration of the adsorbers 1a, 1b, the arrangement of electromagnetic valves V, ~v8, piping, etc. is substantially the same as the example of FIG. 3. does not change. However, in this example, an adsorbed component concentration measuring device 3 and a flow meter 4 are installed at appropriate locations on the raw material gas supply line L1 to continuously measure the adsorbed component concentration and raw material gas flow rate, and send these to the integrated value calculator 5. The system is configured so that the integrated value of introduced adsorbed components supplied to the adsorber 1a (or lb) can be continuously determined.

On the other hand, in the preparation stage for starting operation, the breakthrough point is determined in advance according to the type and amount of adsorbent filled in the adsorbers 1a and 1b, and any value below the breakthrough point (preferably the breakthrough point The previous value) is set in advance as the switching point adsorption capacity. Then, the introduced integrated value of adsorbed components determined by the integration calculator 5 (for example, the area of the shaded area in the graph of FIG. 2)
When the adsorption capacity reaches the switching point, the signal is sent to the control device 6, the raw material gas supply line is switched by opening and closing the electromagnetic valves v1 to v8, and the adsorption process is performed by the adsorber 1b which has completed the desorption process. is started.

Further, regeneration gas is fed from the regeneration gas line L to the adsorber 1a that has reached the switching point adsorption capacity, and regeneration processing is performed in parallel. By automatically repeating this operation, adsorption processing and desorption processing are performed continuously.

Ideally, the integrated value of the introduced amount of the adsorbed component should be measured continuously as described above, but depending on the case, it is also possible to measure it intermittently. In this case, a function of change over time may be obtained by interpolation from several of the latest measured values, and a continuous integrated value of the introduced amount may be calculated by extrapolating this. Also, depending on the type of adsorbent, the adsorption capacity may decrease as the number of repetitions of adsorption and desorption increases, and the adsorption capacity at the breakthrough point may decrease. Since it is possible to confirm the downward trend in advance according to the change, it is possible to easily deal with the downward trend by inputting the downward trend into the integration calculator 5 in advance and setting the switching timing to be advanced one by one. .

Furthermore, in the example shown in FIG. 2, two adsorbers 1a11b are used selectively, and the entire amount of raw material gas is sent to one adsorber 1a (or lb), so the adsorption i1
a.

A concentration meter 3 and a flow meter 4 are installed in the raw material gas supply line L before branching to 1b, but for example, if three or more adsorbers are installed together, the raw material gas is branched and supplied to two or more adsorbers at the same time. If the equipment is such that the raw material gas supply line (after branching) to each adsorber, it is necessary to install a concentration meter and a flow meter, respectively. In addition, when processing a raw material gas containing multiple adsorbed components, calculate the integrated amount of introduced amount of each adsorbed component using the above method, and select the switching point corresponding to the integrated amount of introduced amount of the adsorbed component with the weakest adsorption power. The switching may be performed when the adsorption capacity is reached.

〔Effect of the invention〕

The present invention is constructed as described above, but the key point is to continuously grasp the integrated value of the introduced amount of adsorbed components and to switch when the adsorption capacity of each adsorber is below the breakthrough point. Even if the concentration of the adsorbed component in the raw material gas or the flow rate of the raw material gas fluctuates, the switching timing will not be delayed. Therefore, there is no possibility that gas that has not been adsorbed sufficiently will mix into the purified gas and reduce its purity. Furthermore, since the switching point adsorption capacity can be set to the maximum adsorption capacity of the adsorbent, the adsorption processing capacity can be utilized as effectively as possible and the processing efficiency can be increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention, FIG. 2 is a graph showing an example of measurement of the integrated value of introduced amounts of adsorbed components, and FIG. 3 is a schematic explanatory diagram showing a conventional example. '1a*1b...-adsorber 2...timer 3.
...Concentration measuring device 4--Flowmeter 5... Integration calculator 6--Control device ■1~■, ... Solenoid valve

Claims (1)

[Claims] In a method for continuous operation of an adsorption device in which multiple adsorption devices are installed together, at least one adsorption device performs adsorption processing, the other adsorption devices perform desorption, and the adsorption process and desorption process are switched as appropriate. The switching point adsorption capacity is set in advance for each adsorber, and a device for measuring the concentration of adsorbed components in the fluid is installed in the fluid supply line to each adsorber to measure the concentration of the adsorbed components. Continuous operation of an adsorption device, characterized in that the integrated value of the introduced amount of adsorbed components is calculated, and when the integrated value reaches the preset switching point adsorption capacity, switching between the adsorption process and the desorption process is performed. Method.