Intercooling device of electrolysis device

Abstract

The invention discloses an intermediate cooling device of an electrolysis device. The device comprises a plurality of electrolysis units which are connected in series, and an intermediate cooling device is arranged between two adjacent electrolysis units or in a single electrolysis unit. The device mainly comprises a plate frame, a titanium coil pipe, a cooling water inlet and outlet pipe, an exhaust pipe and a temperature probe. The device can achieve segmented multi-time cooling, the temperature of each part in the tank is uniform, the tank temperature can be effectively controlled within the optimal reaction temperature, and the current efficiency is high. According to the device, unit consumption, direct current consumption and salt consumption of available chlorine are further reduced, meanwhile, the cooling device is flexible in layout, and modular assembly of devices with different productivity can be achieved.

Description

technical field [0001] The invention relates to electrolytic water treatment equipment, in particular to a cooling device for a sodium hypochlorite generator. Background technique [0002] When the on-site sodium hypochlorite generator produces sodium hypochlorite, direct current is applied between the electrode plates to generate electrolytic reaction, which generates a lot of heat. The actual performance is that the temperature of the sodium hypochlorite solution at the outlet of the electrolytic cell is much higher than the temperature of the imported brine, which is called the temperature rise of electrolysis. In the industry standard It is generally required to control the electrolytic temperature rise within 15°C. The electrolytic temperature rise is also an important indicator to measure the performance of the sodium hypochlorite generator. There are many factors that affect the electrolytic temperature rise, such as the structure of the sodium hypochlorite generator i...

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Problems solved by technology

[0004] The first one is to install a cooling titanium coil in the electrolytic cell, and pass in cooling water to indirectly exchange heat to remove the heat generated by the electrolytic reaction. This method is widely used in a single electrolytic cell with a chlorine production of less than 5kg / h, and has disadvantages There are: the inside of the electrolytic tank is originally full of electrode plates, the space is limited, and it is not easy to arrange the cooling coil, resulting in a very close distance between the cooling coil and the electrode plate, and across multiple electrolytic units connected in series in the electrolytic tank ( Between pole groups), it is easy to generate stray current, which affects the current efficiency of the sodium hypochlorite generator. The current efficiency of the existing device is between 65 and 70%. The DC power consumption per kilogram of available chlorine is 4.5kwh, and the salt consumption is 3.8kg. Low and high unit consumption is also affected by this factor

The disadvantages are: First, there is no way to adjust the temperature in the electrolytic cell in real time, and the temperature in the electrolytic cell varies. Usually, when the inlet temperature of the electrolytic cell is 20°C, the outlet temperature reaches about 35°C, and the cell temperature is not stable. Between 25 and 30 ℃, which affects the current efficiency, the current efficiency that can usually be achieved is between 68 and 72%, the DC power consumption per kilogram of available chlorine is 4.2kwh, and the salt consumption is 3.2kg. Second, for most of the time, the environment The temperature is within 5-20°C controlled by the hot and cold water machine, so that the initial temperature of the brine is also within 5-20°C, so the hot and cold water machine cannot effectively function

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