SU696359A1 - Oxygen content determining device - Google Patents

Description

(54) DEVICE TO DETERMINE THE CONTENT OF OXYGEN

The invention relates to the field of power engineering and can be used to control the water regime of steam turbine plants for the determination and content of oxygen in the condensate.

A device for sampling condensate for determining the content of oxygen in it is known, which contains a sampling tank installed on a D | Non-storage vessel, a calorimeter, and a device for dispensing the amount of chemical reagents supplied to tank 1.

The only problem with this device is the small degree of accuracy of the measurements being performed and the complexity of its maintenance.

It is also known a device for determining the oxygen content, mainly for steam power plants, comprising a sampling tank connected to a condenser in front of the condensate pump, a calorimeter and a metering device for feeding chemical reagents into the tank.

The sampling tank is installed in a storage vessel, in which the pressure is equalized with the pressure in the condenser 2 during the extraction of condensate.

The disadvantages of this device are the complexity and laboriousness of the condensate sampling process performed by it, which leads to a longer duration of a single measurement, which makes operational control of the quality of the condensate difficult. In addition, it is possible to diffuse atmospheric oxygen through an insulating layer of water when it is in contact with the atmosphere during the introduction of a chemical reagent into a container and shatter it through the throat of the vessel in which it is placed. This may cause a noticeable distortion of the results of the measurements made, since it is a question of monitoring the microscopic oxygen 3 of the analyzed condensate.

The purpose of the invention is to reduce the time of individual measurements and increase their accuracy.

Claims (2)

This is achieved by connecting a storage vessel with an overflow pipe connected to the condenser’s steam space between the tank and the condenser, which is connected to the condensate pump inlet, and the tank is made in the form of a groove, which is placed in the calorimeter and connected at the inlet through a three-way valve cumulative vessel and with a metering device for supplying chemical reagents to the tank, and at the outlet - with overflow pipe. In addition, a refrigerator and a filter are connected in series between the condenser and the storage vessel in the connecting lines, and an ejector is installed in the overflow pipe, the discharge nozzle of which is connected to the pump outlet. rfa drawing shows schematically the general view of the device. The device contains connected to the condenser 1 in front of the condensate pump 2 a sampling tank made in the form of a flow cell 3, a calorimeter 4 and a metering device 5 for feeding 3 chemical reagents into the cell. The flow cell 3 and the condenser 1 are connected to the storage space of the condenser 1 communicated with the vapor 6 with the overflow tube 7, the co-ora is connected to the pump 2 inlet, and the cuvette 3 is placed in the calorimeter and connected at the inlet through the three-way valve 8 with the bis-5 bore dispenser 11 and at the outlet - with TpyO..Cri overflow 7. In addition, in condensate line 9 between condenser I and storage tank b, the refrigerator 10 and filter 11 are connected in series, and ejector 12 is installed in the overflow pipe 7, the discharge nozzle of which is connected to the pump outlet 2, The apparatus also comprises a clamp 13, separating; vessel 14 and clamps 15-18. The device works as follows. The vessel b should be located below the condensate extraction point, and the metering device 5 discharges the overflow of the vessel 6. A continuous flow of condensate through the cuvette 3 with a constant flow rate is ensured by the constant difference of water levels in the vessel b and the tube that drains condensate from the cuvette 3 For this purpose, the flow rate of condensate taken out of the condenser is set by means of clamp 13, so that a small excess of condensate and vessel b are poured in. Bout pipe 7 and diverted to ejector 12, 8 the same tube is drained of condensate from the cuvette 3. PressureThe levels of condensate in the vessel b VI level | a. of the reagent in the dosing device 5 are set the same as in condenser 1, for which the upper processes of the vessel b and device 5 are connected through a separating vessel 14 to the vapor space of the condenser 1. In the vessel 14 condensate is collected, which may form as a result of vapor condensation in the tube leading to the condenser: this prevents condensate droplets from entering the reagent in the dosing device 5. Periodically draining this condensate from the vessel 14 as it accumulates opening the clamp 15 with the clips 13, 16-18 closed; Replenishment of the reagent in the device 5 while emptying it is carried out by gradually opening the clamp 16. Turning the valve 8 to the position at which the cuvette 3 is connected to the device 5 stops the flow condensate through the cuvette 3 and the reagent is introduced into it in an amount metered on the scale of the device 5. After that, the valve 8 is transferred to the position in which the cuvette 3 is separated from both the device 5 and the (Vessel b, and produces 1-1.5 minute shutter speed required for full rotekani reaction between the reagent introduced into the condensate, and dissolved in kbndensate with oxygen,. turn on the light, conduct calorimetry, after which the cuvette 3 is connected to the vessel 8 with vessel b and washed to prepare the instrument for the next measurement, cooling the condensate taken from condenser 1 to the temperature required for chemical analysis is adjusted by adjusting the flow rate of the cooling medium through the refrigerator 10 / made, for example, on the principle of a pipe in a pipe. The temperature of the condensate is controlled by a thermometer 19 placed in the filter 11 / made detachable from a transparent material to enable it to be periodically recharged with cationite as it loses its absorptive capacity. The invention makes it possible to shorten the measurement time, to increase their accuracy, as a result / to improve the control over the operation of the capacitor. Formula 1. A device for determining the oxygen content, mainly for steam power plants, containing a sampling tank connected to a condenser in front of the condensate pump, a calorimeter and a metering device for delivering chemical reagents to the tank, characterized in between the tank and the condenser is connected, communicating with the vapor space of the condenser, a collection vessel with an overflow tube that communicates with the pump inlet, and the tank is in the form of a flow cell, which is placed in the calorimeter and connected at the inlet through a three-way valve from the vessel and with a dosing device, and at the outlet with a overflow tube. 2. A popl device, characterized in that a refrigerator and a filter are connected in series in the condensate line between the condenser and the storage vessel. 3, Device POP.1, OLTLI-. It is likely that an ejector is installed in the branch tube, the pressure nozzle of which is connected to the pump outlet. Sources of information taken into account during the examination 1.Belan F.I. Water treatment, M.-L., Energie, 1958, p. 133, 2, Table moat A.A. Investigation of condensate deaeration in steam turbine condensers, VTI Report, 1968, p., 40, fig. 13 .