CN206045978U - A kind of sulfur dioxide liquid automatic feeding system - Google Patents

Abstract

The utility model relates to an automatic liquid sulfur dioxide feeding system. The system consists of sulfur dioxide storage tanks, feed pumps, high-level metering tanks, enamel reactors, intelligent instruments with program segments, liquid level differential pressure transmitters, regulating valves and solenoid valves. The high-level metering tank of the system is connected to the sulfur dioxide storage tank through a feed pump and a pipeline with a solenoid valve, and its bottom outlet is connected to an enamel reaction kettle through a pipeline with a regulating valve. When preparing materials, the differential pressure transmitter detects the liquid level signal of sulfur dioxide in the metering tank, and when the liquid level reaches a given value, the intelligent instrument controls the opening and closing of the feed pump and solenoid valve. During program feeding, the program feeding of sulfur dioxide is controlled by the liquid level signal of the metering tank by using the corresponding relationship between the liquid level pressure difference signal and the sulfur dioxide feeding amount. The system controls the programmed feeding amount of sulfur dioxide through the liquid level signal of the metering tank, which simplifies the control scheme and improves the control precision of the feeding amount.

Description

A liquid sulfur dioxide automatic feeding system

technical field

The utility model relates to an automatic feeding system for liquid materials, in particular to a system for adding liquid sulfur dioxide to a reaction kettle during the production process of sodium saccharin.

Background technique

Various raw materials need to be added in the production process of sodium saccharin, and the replacement reaction section needs to add liquid sulfur dioxide at different flow rates at different time intervals. The sulfur dioxide feeding in this section is intermittent operation, the operating pressure is about 0.4MPa, and the feeding speed is adjusted every 5 minutes. The total feeding amount is 610 kg, and the cycle is 70 minutes. In order to ensure stable operation of the production process and reliable product quality, manual feeding is mostly used in the existing production. Operators adjust the feed flow of sulfur dioxide through manual valves according to requirements, and estimate different times based on the liquid level of the sulfur dioxide metering tank on site. Point the total amount of material added. This method not only has a large workload, but also has a large deviation in the amount of feed, which will have a great impact on the quality of the product. Later, the flow transmitter was used to measure the instantaneous volume flow and cumulative volume flow of sulfur dioxide feeding, and the sulfur dioxide feeding was realized through the control mode of single-chip microcomputer. However, this method has defects such as a large cumulative error in the total amount of sulfur dioxide feeding during and at the later stage of feeding, especially when the feeding operation is performed at a small flow rate, the control is not timely, and the flow rate deviation is large. Therefore, it is necessary to develop a sulfur dioxide program feeding system suitable for the production of sodium saccharin with simple operation and accurate feeding, so as to improve the production efficiency and operational reliability of the replacement section.

Contents of the invention

Aiming at the defects in the prior art, the purpose of this utility model is to provide an automatic feeding system for liquid materials, especially a system for quantitatively adding liquid sulfur dioxide to the reactor in the production of saccharin sodium according to the program requirements.

The technical scheme adopted in the utility model is:

The liquid sulfur dioxide automatic feeding system of the utility model includes a sulfur dioxide material preparation system and a program automatic feeding system, which consists of a sulfur dioxide storage tank, a feed pump, a high-level metering tank, an enamel reaction kettle, an intelligent instrument with a program segment, and a liquid level differential pressure transmitter. It is composed of components such as controller, regulating valve and solenoid valve, and has functions such as material preparation, program feeding, feeding reset and end. The top of the high-level sulfur dioxide metering tank of the system is provided with a sulfur dioxide preparation port, a constant pressure balance pipe interface and an overflow port, and a sulfur dioxide discharge port is provided at the bottom. The material preparation port of the metering tank is connected with the sulfur dioxide storage tank through a feed pump and a pipeline with a solenoid valve. The top of the enamel reaction kettle is equipped with a stirring motor, agitator and tail gas outlet, and the bottom is equipped with a sulfur dioxide inlet and a material outlet. The discharge port at the lower part of the metering tank is connected with the sulfur dioxide feed port of the reactor through a sulfur dioxide feed pipeline with a regulating valve. The initial liquid level and end liquid level signal of the high level tank, the opening and closing signal of the solenoid valve and the feeding pump during material preparation, the liquid level signal corresponding to the sulfur dioxide feeding amount during program feeding, the opening degree of the automatic regulating valve, and the reset and end signals are all Connect with smart meter with program segment.

The material preparation system of the utility model is composed of a sulfur dioxide storage tank, a feed pump, a high-level metering tank, and a sulfur dioxide material preparation control system. The sulfur dioxide stock preparation control system is connected by a liquid level differential pressure transmitter and an intelligent instrument, and realizes the opening and closing of the feed pump and the electromagnetic valve by using the upper and lower limit alarms of the instrument.

The program automatic feeding system of the utility model is composed of a high-level metering tank, an enamel reaction kettle, an intelligent instrument, a liquid level differential pressure transmitter, an automatic regulating valve and other components. The liquid level signal corresponding to the amount of sulfur dioxide added during program feeding, the opening degree of the automatic regulating valve, and the reset and end signals are all connected to the intelligent instrument control box with program segments.

The working principle of the utility model is to use the corresponding relationship between the pressure difference signal of sulfur dioxide in the metering tank and the feeding amount, and realize the feeding amount corresponding to the time by controlling the liquid level of the sulfur dioxide in the metering tank. The device controls the liquid level of the sulfur dioxide high-level tank at different times by automatically setting the liquid level value, and realizes the sulfur dioxide program feeding.

The liquid sulfur dioxide automatic feeding system controls the feeding amount in the production process through the sulfur dioxide liquid level in the metering tank, which is beneficial to the operation of the process. Compared with the cumulative flow feeding control technology, the system simplifies the control scheme of the feeding process, improves the control accuracy of the feeding amount in the process, and the automation degree of the operating system is also improved.

Description of drawings:

Fig. 1 is the structural representation of the utility model liquid sulfur dioxide automatic feeding system.

detailed description:

The embodiments described in the utility model are also applicable to the programmed feeding of other liquids, and other embodiments obtained thereby also belong to the protection scope of the utility model.

The liquid sulfur dioxide automatic feeding system of the utility model consists of a sulfur dioxide storage tank 1, a feed pump 2, a high-level metering tank 3, an enamel reaction kettle 4, an intelligent instrument with a program segment 5, a liquid level differential pressure transmitter 6, a solenoid valve 7, An automatic regulating valve 8, a constant pressure balance pipe 9 and related pipelines are formed. Among them, the high-level metering tank 3 is provided with a glass tube liquid level gauge 301, the top of the metering tank 3 is provided with a sulfur dioxide preparation port 31, a constant pressure balance pipe interface 32 and an overflow port 33, and the bottom part is provided with a sulfur dioxide discharge port 34. The enamel reaction kettle 4 is a jacketed reactor with a stirring motor 401 , an agitator 402 and an exhaust gas outlet 43 at the top, and a sulfur dioxide feed port 41 and a material discharge port 42 at the bottom.

The sulfur dioxide storage tank 1 of the system described in the utility model is connected to the high-level metering tank 3 through the delivery pipeline of the feed pump 2, the electromagnetic valve 7 and the material preparation port 31; the sulfur dioxide outlet 34 of the metering tank 3 is provided with a regulating valve 8 The pipeline and the sulfur dioxide feed port 41 are connected with the enamel reactor 4. The input end of the smart meter 5 with program segments is connected to the liquid level differential pressure transmitter 6 on the high-level metering tank 3 , and the output end is connected to the solenoid valve 7 and the regulating valve 8 respectively.

The constant pressure balance pipe interface 32 of the metering tank 3 of the utility model is connected with the constant pressure balance pipe 9 .

The material preparation system of the utility model includes a sulfur dioxide storage tank 1, a feed pump 2, a high-level metering tank 3, an intelligent instrument 5 with a program segment, a liquid level differential pressure transmitter 6 and an electromagnetic valve 7, wherein the liquid level differential pressure transmitter The opening and closing signals of the device 6, the solenoid valve 7 and the feed pump 2 are connected with the smart meter 5. When preparing materials, the differential pressure transmitter 6 detects the liquid level signal of sulfur dioxide in the metering tank 3, and when the liquid level reaches a given value, the intelligent instrument 5 gives a signal to realize the opening and closing of the feed pump 2 and the solenoid valve 7.

The program automatic feeding system of the utility model includes a high-level metering tank 3, an enamel reaction kettle 4, an intelligent instrument 5, a liquid level differential pressure transmitter 6, and an automatic regulating valve 8, wherein the program control part is controlled by the liquid level differential pressure transmitter 6. The smart instrument 5 and the automatic regulating valve 8 are connected in sequence to form. When the program feeds, the liquid level signal of the high-level metering tank 3 is detected by the liquid level differential pressure transmitter 6. The opening of the regulating valve 8 is adjusted by setting the given value of each program segment of the intelligent instrument 5, and the technological operation of controlling the amount of sulfur dioxide feeding is realized through the sulfur dioxide liquid level signal.

Claims (4)

1. An automatic liquid sulfur dioxide feeding system, characterized in that the system consists of a sulfur dioxide storage tank (1), a feed pump (2), a high-level metering tank (3), an enamel reaction kettle (4), and an intelligent instrument with a program ( 5), liquid level differential pressure transmitter (6), solenoid valve (7), regulating valve (8) and constant pressure balance pipe (9), the high-level metering tank (3) passes through the feed pump (2) It is connected with the sulfur dioxide storage tank (1) through the pipeline with the solenoid valve (7), and its bottom outlet (34) is connected with the enamel reaction kettle (4) through the pipeline with the regulating valve (8). The input end of the smart instrument (5) is connected to the liquid level differential pressure transmitter (6) on the high-level metering tank (3), and the output end is respectively connected to the solenoid valve (7) and the regulating valve (8). 2. The system according to claim 1, characterized in that the constant pressure balance pipe interface (32) of the metering tank (3) is connected to the constant pressure balance pipe (9). 3. The system according to claim 1, characterized in that when the sulfur dioxide is being prepared, the opening and closing of the feed pump (2) and the solenoid valve (7) are controlled by the liquid level signal of the sulfur dioxide in the high-level metering tank (3). 4. The system according to claim 1, characterized in that during program feeding, liquid feeding is realized by controlling the opening of the regulating valve (8) through the liquid level pressure difference signal of the sulfur dioxide high-level metering tank (3).