CN-121995977-A - Liquid level control system for ammonia water environment

CN121995977ACN 121995977 ACN121995977 ACN 121995977ACN-121995977-A

Abstract

The invention relates to the technical field of liquid level control, in particular to a liquid level control system for an ammonia water environment, which comprises an ammonia water tank, an ammonia water pump, a liquid level sensor and a logic controller, wherein the ammonia water tank is provided with a liquid inlet and a liquid outlet, the liquid inlet of the ammonia water tank is connected with the liquid outlet of the ammonia water pump, the liquid level sensor is arranged on the ammonia water tank, the logic controller is in communication connection with the ammonia water pump and the liquid level sensor, the liquid level sensor senses the liquid level of ammonia water in the ammonia water tank and sends a signal to the logic controller, and the logic controller sends an instruction to control whether the ammonia water pump supplements ammonia water to the ammonia water tank. According to the invention, the liquid level in the ammonia water tank is synchronously controlled by two different control modes, so that the stability and reliability of ammonia water control are improved, and long-period safe operation is ensured.

Inventors

MA LIANMING
GENG GUOXIN
WANG YUCHUAN
WANG HUAIQIANG
ZHEN SHIBO
GAO FEI
LI GUOHUI
ZHAO JIAN
LI RUIJUN
ZHENG LI
HU HONGYU
LI ZHENBAO
XIE HAOBIN
Jiang chunxing
SUN GUOYU
NING CUIJUN
LIU JINGYA
Xu Laili
WANG ZIQIANG
DAI JIANKUN

Assignees

唐山三友化工股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251223

Claims (9)

1. The liquid level control system for the ammonia water environment is characterized by comprising an ammonia water tank, an ammonia water pump, a liquid level sensor and a logic controller; The ammonia water tank is provided with a liquid inlet and a liquid outlet; the liquid inlet of the ammonia water tank is connected with the liquid outlet of the ammonia water pump; the liquid level sensor is arranged on the ammonia water tank; The liquid level sensor senses the liquid level of the ammonia water in the ammonia water tank and sends a signal to the logic controller, and the logic controller sends an instruction to control whether the ammonia water pump supplements the ammonia water to the ammonia water tank.
2. The liquid level control system for an aqueous ammonia environment of claim 1, wherein a sleeve is provided on top of the aqueous ammonia tank, and an insulating plate is provided on the sleeve; The liquid level sensor comprises a first detection column, a second detection column, a third detection column and a liquid level controller, wherein the first detection column, the second detection column and the third detection column are all arranged on an insulating plate, The first end of the first detection column is provided with a first binding post, the second end of the first detection column is provided with a first probe, the first end of the second detection column is provided with a second binding post, the second end of the second detection column is provided with a second probe, the first end of the third detection column is provided with a third binding post, and the second end of the third detection column is provided with a third probe; the first binding post, the second binding post and the third binding post are respectively connected with a liquid level controller through connecting wires, and the liquid level controller is connected with a logic controller.
3. The liquid level control system for an aqueous ammonia environment according to claim 2, wherein the second end of the first probe column is provided with a probe insertion hole, the first probe column is provided with a jackscrew fixing hole communicated with the probe insertion hole, the first probe is positioned in the probe insertion hole, and a jackscrew for fixing the first probe is arranged in the fixing hole.
4. The liquid level control system for an aqueous ammonia environment according to claim 2, wherein the aqueous ammonia pump comprises a U end, a V end and a W end, wherein the U end is connected with an L1 end of an external power supply through a motor protector and a first connecting wire, the V end is connected with an L2 end of the external power supply through a second connecting wire, and the W end is connected with an L3 end of the external power supply through a motor protector and a third connecting wire; The first end of the motor protector is connected with the L3 end of the external power supply, the second end and the third end of the motor protector are connected with the zero line of the external power supply, and the third end and the fourth end of the motor protector are respectively connected with the logic controller; the L3 end of the external power supply is connected with the liquid level controller through the voltage conversion circuit and provides the liquid level controller with the second voltage required by the liquid level controller, and the L3 end of the external power supply is connected with the logic controller and provides the logic controller with the first voltage required by the logic controller.
5. The liquid level control system for an aqueous ammonia environment of claim 4, wherein the voltage conversion circuit comprises a capacitor C1, a capacitor C2, a resistor R, a diode D1, a diode D2, and a diode D3; one end of the resistor R is connected with the L3 end of an external power supply, the other end of the resistor R is connected with one end of the diode D2, and the other end of the diode D2 is connected with the liquid level controller and provides a second voltage required by the liquid level controller; The other end of the resistor R is grounded through a diode D1, the other end of the diode D2 is grounded through a diode D3, one end of the capacitor C2 is connected with the other end of the diode D2, and the other end of the capacitor C2 is grounded.
6. The liquid level control system for an aqueous ammonia environment of claim 4, wherein the liquid level controller comprises a first terminal, a second terminal, a fourth terminal, a seventh terminal, and an eighth terminal; The first wiring terminal of the liquid level controller is connected with the third wiring terminal, the eighth wiring terminal of the liquid level controller is connected with the second wiring terminal, the seventh wiring terminal of the liquid level controller is connected with the first wiring terminal, the second wiring terminal of the liquid level controller is connected with the voltage conversion circuit, and the fourth wiring terminal of the liquid level controller is connected with the first terminal of the logic controller.
7. The liquid level control system for an aqueous ammonia environment of claim 6, wherein when the liquid level in the aqueous ammonia tank is lower than the second probe, the first connection terminal is disconnected from the eighth connection terminal, so that the second connection terminal is connected with the fourth connection terminal, the first terminal of the logic controller is powered on, the logic controller receives a low liquid level switching value signal of the liquid level controller, and the logic controller sends out a command to start the aqueous ammonia pump to supplement aqueous ammonia for the aqueous ammonia tank; When the liquid level in the ammonia water tank is higher than the first probe, the first wiring terminal is communicated with the seventh wiring terminal, so that the second wiring terminal is disconnected from the fourth wiring terminal, the first terminal of the logic controller is powered off, the logic controller receives a high liquid level switching value signal of the liquid level controller, and the logic controller sends out a command to stop the ammonia water pump to supplement ammonia water for the ammonia water tank.
8. The liquid level control system for an aqueous ammonia environment of claim 1, further comprising a first differential pressure transmitter and a second differential pressure transmitter, wherein the first differential pressure transmitter and the second differential pressure transmitter are respectively communicated with the aqueous ammonia tank, the aqueous ammonia tank is provided with a first source point and a second source point, the first differential pressure transmitter is used for acquiring a first pressure value of the first source point, the second differential pressure transmitter is used for acquiring a second pressure value of the second source point, and the second source point is located above the first source point.
9. The liquid level control system for an ammonia water environment according to claim 8, wherein the first differential pressure transmitter and the second differential pressure transmitter are respectively and electrically connected with the logic controller, the first differential pressure transmitter outputs a first pressure value to the logic controller, the second differential pressure transmitter transmits a second pressure value to the logic controller, the logic controller calculates a pressure difference value of the ammonia water tank in real time through the first pressure value and the second pressure value, and the logic controller can also give out instructions to control whether the ammonia water pump supplements ammonia water to the ammonia water tank based on the pressure difference value.

Description

Liquid level control system for ammonia water environment Technical Field The invention relates to the technical field of liquid level control, in particular to a liquid level control system for an ammonia water environment. Background Dissolving ammonia and water to obtain ammonia water, and displaying alkalinity. The caustic nature of the ammonia is corrosive and the corrosive hazards of ammonia are related to a number of aspects and can cause damage to materials and equipment. Corrosion of metallic materials ammonia can chemically react with a variety of metals, resulting in corrosion of metallic materials. For example, ammonia can react with copper and copper alloys to generate cuprammonium ions to accelerate corrosion of copper, damage to nonmetallic materials such as rubber and plastics due to ammonia is corrosive, physical properties of the materials are changed due to long-term contact, such as softening and elasticity losing, and damage to equipment and pipelines is caused by corrosion of ammonia, which can cause leakage of equipment and pipelines in industrial production, and increase risk of safety accidents. For example, ammonia can react with steel to produce hydrogen, cause stress corrosion cracking, and the like. Ammonia water is usually stored in an ammonia water tank, the existing simplest and lowest-cost liquid level control technology uses a floating ball/float type switch to control the liquid level as the most common control type, the principle is that buoyancy is utilized, a float drives a connecting rod or a magnetic reed switch to control a liquid inlet pump and a liquid inlet valve along with the lifting of the liquid level, the ammonia water has corrosiveness to the floating ball/float, and the floating ball/float can be corroded and damaged after long-term contact. In the production process, the failure of the liquid level controller can cause overflow of ammonia water, which causes serious consequences such as environmental pollution, fire explosion and the like, so that the liquid level control of the ammonia water environment is required to adopt stable control equipment so as to prevent accidents. Disclosure of Invention In order to solve the problems, the invention aims to provide a liquid level control system for an ammonia water environment, which can avoid corrosion damage of a liquid level controller in the ammonia water environment and can obtain a safe, stable and reliable automatic control system. The invention relates to a liquid level control system for an ammonia water environment, which comprises an ammonia water tank, an ammonia water pump, a liquid level sensor and a logic controller, wherein the ammonia water tank is connected with the ammonia water pump; The ammonia water tank is provided with a liquid inlet and a liquid outlet; the liquid inlet of the ammonia water tank is connected with the liquid outlet of the ammonia water pump; the liquid level sensor is arranged on the ammonia water tank; The liquid level sensor senses the liquid level of the ammonia water in the ammonia water tank and sends a signal to the logic controller, and the logic controller sends out an instruction to control whether the ammonia water pump supplements the ammonia water to the ammonia water tank. Further, a sleeve is arranged at the top of the ammonia water tank, and an insulating plate is arranged on the sleeve; The liquid level sensor comprises a first detection column, a second detection column, a third detection column and a liquid level controller, wherein the first detection column, the second detection column and the third detection column are all arranged on an insulating plate, The first end of the first detection column is provided with a first binding post, the second end of the first detection column is provided with a first probe, the first end of the second detection column is provided with a second binding post, the second end of the second detection column is provided with a second probe, the first end of the third detection column is provided with a third binding post, and the second end of the third detection column is provided with a third probe; the first binding post, the second binding post and the third binding post are respectively connected with a liquid level controller through connecting wires, and the liquid level controller is connected with a logic controller. Further, a probe insertion hole is formed in the second end of the first detection column, a jackscrew fixing hole communicated with the probe insertion hole is formed in the first detection column, the first probe is located in the probe insertion hole, and jackscrews used for fixing the first probe are arranged in the fixing hole. The ammonia water pump further comprises a U end, a V end and a W end, wherein the U end is connected with an L1 end of an external power supply through a motor protector and a first connecting wire, the V end is connected with an L2 end of the external power supply