CN202887006U - Cutoff water supply control device for analysis meter - Google Patents

Abstract

The analytical instrument flow interruption and water replenishment control device includes a medium-pressure shut-off valve and a thermostat at the sample water sampling point. Sample water enters the analytical instrument or electrode flow cell after passing through the medium-pressure shut-off valve and thermostat. Its features include a sampling solenoid valve, a float flowmeter with a flow interruption signal, a flow interruption and water replenishment solenoid valve, a flow interruption and water replenishment tank, a water tank replenishment solenoid valve, a recovery water tank, and a recovery water pump. The sampling solenoid valve and the float flowmeter with a flow interruption signal are connected to the pipeline after the thermostat. During normal sampling, the sampling solenoid valve is open, and the flow interruption and water replenishment solenoid valve is closed. The flow interruption and water tank replenishment solenoid valve are connected in parallel to this pipeline. When the sample water flow is interrupted, the sampling solenoid valve is closed, and the flow interruption and water replenishment solenoid valve is open. This achieves the purpose of protecting the instrument and enables resource recovery and recycling, which is of great significance for the stable operation of the analytical instrument.

Description

Analytical instrument cut-off water replenishment control device

technical field

The utility model relates to a water supply control device for an analysis instrument, in particular to a centralized sampling device for chemical analysis of the water treatment system of a power plant. control device.

Background technique

Chemical supervision is an important link to ensure the safe, economical and stable operation of power plants, and the supervision of water vapor quality is the main work content of chemical supervision. The power plant is in continuous operation. During the circulation of the working medium in the thermal system, the stability of water and steam quality and the randomness of its pollution constitute the technical characteristics of chemical supervision. Supervise and measure the random situation of water vapor quality in the thermal process, so as to realize the whole process supervision of water vapor quality. Chemical technology supervision requires the continuous and timely monitoring function of online chemical instruments and the technical characteristics of eliminating omissions, false reports, subjective errors and accuracy. At the same time, technical diagnosis also requires that the monitoring data provided by chemical instruments can fully play its role, predict signs of water vapor quality deterioration, forecast possible accidents, and provide guidance for accident recovery and prompt treatment measures. It is of great significance to improve the level of chemical supervision and ensure the safe and economical operation of steam turbine generator equipment that the measurement data of online continuous analysis instruments can be put into operation accurately and reliably. Therefore, how to make the online chemical instrument run normally, stably and reliably is a very important task.

Centralized sampling rack for online chemical instruments, common instruments include pH, conductivity meters, silicon meters, sodium meters, dissolved oxygen meters, etc. The traditional instrument sampling method is: the sample water enters the inside of the analytical instrument or the electrode flow cell after passing through the medium pressure shut-off valve, constant temperature device, pressure reducing valve, filter, and low-pressure shut-off valve. Normally, the sample water flows continuously and the analytical instrument works normally with regular maintenance. When the unit is out of operation, it cannot provide stable sample water for the analysis instrument. The design of the flow cell of some analytical instruments has taken into account the situation of possible water cut-off. The position of the water inlet of the flow cell is low and the position of the water outlet is high, so that there is always a water sample in the flow cell and the electrode can always be immersed in water. However, in the actual use process, due to various reasons, there is no guarantee that there is enough water sample in the flow cell, which has a great impact on the service life and measurement accuracy of the analytical instrument, and in severe cases, it will damage the instrument electrodes or internal measuring components. .

Contents of the invention

The purpose of this utility model is to propose a water replenishment control device for analytical instruments, which can replenish qualified water samples when the normal sample water of the analytical instrument is interrupted, so as to ensure that the analytical instrument works under normal conditions of use and extend the life of the analytical instrument. service life and ensure its measurement accuracy.

The technical solution of the utility model is: the control device for water replenishment of the analysis instrument, including the medium pressure cut-off valve and the constant temperature device of the sample water sampling point, and the sample water enters the inside of the analysis instrument or the electrode flow pool after passing through the medium pressure stop valve and the constant temperature device ; There is also a sampling solenoid valve, a float flowmeter with a cut-off signal, a cut-off water replenishment solenoid valve, a cut-off water replenishment tank, a water tank replenishment solenoid valve, a recovery water tank, and a recovery water pump; The float flowmeter is connected to the pipeline behind the constant temperature device; during normal sampling, the sampling solenoid valve is opened, and the stop-flow replenishment solenoid valve is closed; the stop-flow replenishment water tank and the water tank replenishment solenoid valve are connected in parallel to this pipe; when the sample water is cut off, the sampling solenoid valve Closed, the stop-flow replenishment solenoid valve is opened, which ensures the continuous flow of the analytical instrument and achieves the purpose of protecting the instrument. When the analytical instrument is maintained and calibrated, the electrode or the internal pipeline of the instrument can be cleaned with the water source of the cut-off water supply.

Further, there is a recovery water tank, which is connected to the analysis instrument or the flow cell of the electrode after the sample water flows out of the pipeline.

Qualified sample water or demineralized water can be recovered for recycling. In addition, the device can operate fully automatically, and can also switch the operation mode and manually intervene in the operation control mode.

The beneficial effects of the utility model are: this is a control device for water replenishment when the flow of normal sample water is cut off, which can replenish qualified water samples and recycle resources for recycling. At the same time, combined with the reasonable design of the auxiliary circuit, the device can be operated fully automatically, and the operation mode can also be switched, and the operation control mode can be manually intervened.

Description of drawings

Fig. 1 is a structural diagram of the utility model system.

Detailed ways

As shown in Figure 1, sampling solenoid valve 1, float flowmeter with cut-off signal 2, cut-off replenishment solenoid valve 3, cut-off replenishment water tank 4, water tank replenishment solenoid valve 5, recovery water tank 6, recovery water pump 7, sampling point 8. Analytical instrument 9, constant temperature device 10.

The connection method of a complete analytical instrument includes a medium pressure shut-off valve, a thermostat, a pressure reducing valve, a filter and a low pressure shut-off valve, which are connected in sequence. The sample water enters the interior of the analytical instrument or the electrode flow cell after passing through the medium-pressure shut-off valve and the thermostat. On the basis of the original equipment, the present invention adds a sampling solenoid valve, a float flowmeter with a cut-off signal, a cut-off water replenishment solenoid valve, a cut-off replenishment water tank, and a water tank replenishment solenoid valve; the sample water is connected to the Rotameter with cut-off signal, and then connected to the analysis instrument. The water intake of the cut-off replenishment solenoid valve is provided by the cut-off replenishment water tank, and the pipeline is connected after the float flowmeter with the cut-off signal, and then connected to the analysis instrument. During normal sampling, the sampling solenoid valve is opened, and the stop-flow replenishment solenoid valve is closed. When the rotameter detects a cut-off, it sends a cut-off contact signal, which is interlocked with the cut-off water replenishment solenoid valve. At this time, the sampling solenoid valve is closed, and the cut-off water replenishment solenoid valve is opened.

According to the characteristics of the instrument, desalinated water with good water quality is used as the water source for supplementary water supply. The cut-off replenishment water tank is equipped with a water tank replenishment solenoid valve, which is interlocked with the liquid level switch of the water tank. When the liquid level is low, the water tank replenishment solenoid valve is opened to start replenishing water. When the liquid level is high, the water tank replenishment solenoid valve is closed to stop water replenishment. In order not to waste resources, a recovery water tank is set up to recover qualified sample water or demineralized water. When the flow of the analysis instrument is cut off, the recovery water pump is used to pump it to the cut-off make-up water tank for recycling. The recovery water pump is interlocked with the liquid level switch of the recovery water tank. It should be noted that silicon meters, sodium meters and other instruments need to add chemicals when analyzing sample water, so this part of water cannot be recycled and needs to be discharged directly, which needs to be considered in the design of the pipeline system. Since the water source of cut-off replenishment is demineralized water with good water quality, it can be used to clean the electrodes or internal pipelines of the instrument when the analytical instrument is maintained and calibrated.

During normal operation, the sampling solenoid valve is opened, and the stop-flow replenishment solenoid valve is closed. The sample water from the sampling point enters the analytical instrument after passing through the medium pressure cut-off valve, constant temperature device, pressure reducing valve, filter, and low-pressure cut-off valve, and the analytical instrument is in a normal working state.

When the rotameter detects a cut-off, it sends a cut-off contact signal, which is interlocked with the cut-off replenishment solenoid valve. At this time, the sampling solenoid valve is closed, the stop-flow replenishment solenoid valve is opened, and the stop-flow replenishment water tank provides sample water to the analysis instrument, thereby ensuring that the analysis instrument is always in a state of water. The water replenishment solenoid valve of the cut-off replenishment water tank is interlocked with the liquid level switch of the water tank. When the liquid level is low, the water replenishment solenoid valve of the water tank is opened to start replenishing water. When the liquid level is high, the water replenishment solenoid valve of the water tank is closed to stop replenishing water. And the qualified sample water or demineralized water is recovered to the recovery water tank. When the analysis instrument is cut off, the recovery water pump is used to pump it to the cut-off make-up water tank for recycling, which achieves the effect of rational utilization of resources.

Claims (2)

1. analysis meter cutout water-replenishing control device is characterized in that comprising middle pressure cutoff valve, the thermostat of sample water sampling spot, sample water through in enter analysis meter inside or electrode flow-through cell behind the pressure cutoff valve, thermostat; It is characterized in that being provided with in addition the sampling solenoid valve, be with the suspended body flowmeter, cutout moisturizing solenoid valve, cutout water supply tank, water tank moisturizing solenoid valve, return water tank, the recovered water pump that connect the cutout signal; Sampling solenoid valve and the pipeline of being with after the suspended body flowmeter that connects the cutout signal is connected on thermostat; During normal sampling, the sampling solenoid valve is opened, cutout moisturizing closed electromagnetic valve; Cutout water supply tank and water tank moisturizing solenoid valve are parallel to this pipeline; During the sample water cutout, the sampling closed electromagnetic valve, cutout moisturizing solenoid valve is opened.

2. analysis meter cutout water-replenishing control device according to claim 1 is characterized in that being provided with return water tank, and sample water flows out pipeline after linking parsing instrument or the electrode flow-through cell.

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