A program-controlled regeneration process based on a modified in-vivo regeneration mixed bed

Abstract

The present invention relates to a program-controlled regeneration process based on a modified internal regeneration mixed bed, including the sequential steps of primary water discharge, scrubbing, secondary water discharge, stratification, tertiary water discharge, acid and alkali feeding, replacement, quaternary water discharge, primary water feeding, fifth water discharge, mixing, sixth water discharge, secondary water feeding and positive washing, characterized in that when the primary water discharge, tertiary water discharge and fifth water discharge of the program-controlled regeneration process are performed, the water level in the internal regeneration mixed bed is discharged to the height position of the control drain valve through the program-controlled drainage pipeline. Compared with the prior art, the present invention does not need to rely on timing control, and only needs to provide a time sufficient to empty the water above the control water level, which is sufficient to ensure the precise control of the water discharge level.

Description

Technical Field

[0001] The invention belongs to the technical field of mixed bed regeneration, and relates to a program-controlled regeneration process based on a modified in-vivo regeneration mixed bed. Background Art

[0002] The in-vivo regeneration mixed bed (hereinafter referred to as mixed bed) currently commonly used in the water treatment industry needs to be regenerated according to the operating conditions.

[0003] In the existing mixed bed regeneration operation, air scrubbing and acid and alkali addition are the two important steps. Ensuring that the water level in the mixed bed is at the correct height during these two steps is the key factor affecting the success of the operation.

[0004] In the existing program-controlled regeneration, the regeneration mixed bed is used. Figure 1 As shown, during the specific regeneration process, the timing control sets the bottom drain valve to open for a fixed time (such as 90 seconds) to release water. If there is a delay in opening the valve, the actual water level after 90 seconds will be higher than the preset control water level; or if there is a delay in closing the valve, the actual water level will be lower than the preset control water level; or, the compaction degree of the resin layer is different during each regeneration, which will result in the same 90-second water release time, and the final actual water level will have random and uncontrollable deviations.

[0005] If the water level is not properly controlled, the following problems will occur: in the air scrubbing step, a large amount of resin will overflow (the water level is too high) or the resin will not loosen (the water level is too low); in the acid and alkali introduction link, the concentration of the alkali regeneration liquid will be too low (the water level is too high) or the acid and alkali will be unevenly introduced (the water level is too low), resulting in poor regeneration operation results or even regeneration failure. Summary of the invention

[0006] The purpose of the present invention is to provide a program-controlled regeneration process based on a modified in-vivo regenerative mixed bed. By draining water through a program-controlled drainage pipeline before the mixed bed is scrubbed and the acid and alkali are introduced, the entire process of program-controlled regeneration of the mixed bed can be carried out accurately and automatically.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A program-controlled regeneration process based on a modified internal regenerative mixed bed, comprising the following steps: primary water discharge, scrubbing, secondary water discharge, stratification, tertiary water discharge, acid and alkali addition, replacement, quaternary water discharge, primary water addition, quintuple water discharge, mixing, sixth water discharge, secondary water addition and positive washing, wherein the modified internal regenerative mixed bed is further provided with a program-controlled drainage pipeline parallel to a bottom drainage valve, a control drainage valve is provided in the program-controlled drainage pipeline, a siphon breaking pipeline is further connected to the rear of the control drainage valve, and an automatic exhaust valve is further provided in the siphon breaking pipeline;

[0009] When the program-controlled regeneration process is performed with one drain, three drains, or five drains, the water level in the in-vivo regeneration mixed bed is discharged to the height position of the controlled drain valve via the program-controlled drain pipeline.

[0010] Furthermore, when the secondary water discharge is performed, the water discharge time is controlled by timing until the water is emptied.

[0011] Furthermore, when draining water four times, the water is drained for a sufficient time until it is emptied.

[0012] Furthermore, the control process of the automatic exhaust valve is designed as follows: when the drain valve is controlled to open and the program-controlled drain pipeline is drained, the automatic exhaust valve is opened at the same time.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] (1) This solution is based on the modified mixed bed and can help realize unmanned automation of the entire program-controlled regeneration process of the mixed bed.

[0015] (2) Unmanned automation of mixed bed program-controlled regeneration is an important bottleneck in the automation of chemical water production systems in power plants. Solving this problem will help power plant chemical water production systems gain a favorable position in the application of big data and artificial intelligence, and lay a technical foundation for the control technology innovation of power plant chemical systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an existing in-vivo regeneration mixed bed;

[0017] Figure 2 It is a schematic diagram of the structure of the in vivo regeneration mixed bed of the present invention;

[0018] Description of the markings in the figure:

[0019] V1-water inlet valve, V2-exhaust valve, V3-upper drain valve, V4-alkali inlet valve, V5-middle drain valve, V6-backwash inlet valve, V7-acid inlet valve, V8-water outlet valve, V9-bottom drain valve, V10-control drain valve, V11-automatic exhaust valve, V12-air inlet valve, V13-sampling valve. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0021] In the following embodiments, unless otherwise specified, functional components or technologies are conventional components or conventional technologies used in the art to realize corresponding functions.

[0022] Embodiment 1:

[0023] This embodiment provides a program-controlled regeneration process based on a modified in-vivo regenerative mixed bed, wherein the modified in-vivo regenerative mixed bed is as follows: Figure 2 As shown, it includes a bed body, a resin layer filled in the bed body, and a water inlet valve V1, an exhaust valve V2, an upper drain valve V3, an alkali inlet valve V4, an intermediate drain valve V5, a backwash water inlet valve V6, an acid inlet valve V7, a water outlet valve V8, a bottom drain valve V9, a control drain valve V10, an automatic exhaust valve V11, an air inlet valve V12, and a sampling valve V13 arranged on the bed body. The automatic exhaust valve is arranged on the siphon destruction pipeline and connected behind the control drain valve.

[0024] The entire process includes the first draining, scrubbing, the second draining, stratification, the third draining, acid and alkali addition, replacement, the fourth draining, the first water addition, the fifth draining, mixing, the sixth draining, the second water addition and the positive washing in sequence.

[0025] The program control process of each process is as follows:

[0026] 1. Drain water once: open the control drain valve V10 and the exhaust valve V2, and drain water through the control drain valve V10 after sufficient time;

[0027] 2. Scrubbing: Open the air inlet valve V12 and the upper drain valve V3, and control the scrubbing time by timing;

[0028] 3. Secondary water discharge: open the air inlet valve V12, the middle drain valve V5, and the bottom drain valve V9, and control the water discharge time by timing until it is empty;

[0029] 4. Layering: Open the backwash water inlet valve V6, the upper drain valve V3, and the exhaust valve V2, and control the backwash time by timing;

[0030] 5. Drain water three times: open the control drain valve V10 and the exhaust valve V2, and drain water through the control drain valve V10 after sufficient time;

[0031] 6. Acid and alkali inlet: open the alkali inlet valve V4, acid inlet valve V7, and intermediate drain valve V5, and control the acid and alkali inlet by timing or liquid level;

[0032] 7. Replacement: Open the alkali inlet valve V4, the acid inlet valve V7, and the intermediate drain valve V5, and control the replacement time sequentially;

[0033] 8. Drain water four times: open the exhaust valve V2, the middle drain valve V5 and the bottom drain valve V9, and drain the water sufficiently;

[0034] 9. Primary water inlet: open the water inlet valve V1 and the exhaust valve V2, and control the water inlet by timing or pressure;

[0035] 10. Mixing: Open the air inlet valve V12, the upper drain valve V3, and the exhaust valve V2, and control the mixing time sequentially;

[0036] 11. Drain water six times: open the exhaust valve V2, the middle drain valve V5 and the bottom drain valve V9, and drain the water sufficiently;

[0037] 12. Secondary water inlet: open the water inlet valve V1 and the exhaust valve V2, and control the water inlet by timing or pressure;

[0038] 13. Positive wash: Open the water inlet valve V1 and the bottom drain valve V9, controlled by timing or conductivity meter.

[0039] The program-controlled regeneration process of the regenerative mixed bed of this embodiment is compared with the typical mixed bed regeneration control process, and the differences between the two are shown in Table 1 below.

[0040] Table 1 Comparison of the regeneration process of this embodiment with the typical mixed bed regeneration process

[0041]

[0042]

[0043] In the above table, “ / ” indicates that the control steps are consistent with those of a typical mixed bed regeneration process.

[0044] Through the process comparison in Table 1, it can be seen that the specific water discharge operation performed by the present invention does not need to rely on timing control. It only needs to provide a time sufficient to empty the water above the control water level, which is sufficient to ensure accurate control of the water discharge level.

[0045] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A program-controlled regeneration process based on a modified internal regeneration mixed bed, comprising the following steps: primary water discharge, scrubbing, secondary water discharge, stratification, tertiary water discharge, acid and alkali addition, replacement, quaternary water discharge, primary water addition, quintuple water discharge, mixing, sixth water discharge, secondary water addition and positive washing, characterized in that: When the program-controlled regeneration process is drained once, drained three times, or drained five times, the water level in the in-vivo regeneration mixed bed is drained to a height position controlled by the drain valve via the program-controlled drain pipeline.

2. A program-controlled regeneration process based on a modified in-vivo regeneration mixed bed according to claim 1, characterized in that: When the secondary water discharge is performed, the water discharge time is controlled by timing until the water is emptied.

3. The program-controlled regeneration process based on the modified in-vivo regeneration mixed bed according to claim 1 is characterized in that: When performing the four draining times, drain the water sufficiently until it is empty.

4. The program-controlled regeneration process based on the modified in-vivo regeneration mixed bed according to claim 1 is characterized in that: The control process of the automatic exhaust valve is designed as follows: when the drain valve is controlled to open and the program-controlled drain pipeline is drained, the automatic exhaust valve is opened at the same time.

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