Hydrogen chloride absorption system with intelligent pressure control

Abstract

A hydrogen chloride absorption system with intelligent pressure control, comprising: a three-in-one synthesis furnace for combustion reaction of hydrogen and chlorine, cooling of hydrogen chloride gas and absorption of hydrochloric acid; a chlorine inlet pipeline; a hydrogen inlet pipeline; a tail gas absorption tower; a circulating liquid system; a hydraulic ejector; an intelligent pressure control system comprising a pressure regulating valve, a vent valve and a pressure detection unit. Compared with the prior art, the hydrogen chloride absorption system can effectively control the pressure at the top of the tail gas absorption tower, ensure that the pressure at the top of the tail gas absorption tower maintains negative pressure, form a closed loop control circuit by using a pressure gauge and a regulating valve, accurately control the pressure at the top of the tail gas absorber, automatically regulate and control the pressure at the top of the tail gas absorption tower, ensure that hydrogen chloride tail gas is absorbed under optimal conditions, avoid too low pressure at the top of the tail gas absorption tower and cause accidents, and ensure that process indexes of the hydrogen chloride absorption device meet standards.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen chloride absorption chemical technology, and in particular to a hydrogen chloride absorption system with intelligent pressure control. Background Technology

[0002] Traditional hydrogen chloride absorption systems suffer from inaccurate pressure control, low automation, and insufficient safety performance. Pressure control in the absorption system is crucial during hydrogen chloride production; excessive pressure leads to substandard emissions, while insufficient pressure can cause equipment damage and safety accidents. Most existing absorption systems employ simple mechanical pressure control devices, which struggle to accurately maintain the required negative pressure at the top of the tail gas absorber. Maintaining negative pressure at the top of the absorber is a critical process requirement, but current technologies often exhibit large pressure fluctuations and lag in adjustment, resulting in unstable absorption efficiency. Furthermore, the hydrogen and chlorine reaction process poses an explosion risk, but traditional systems rely solely on basic safety valves and flame arresters, lacking comprehensive safety measures such as automatic nitrogen purging and multiple interlocking protections as described in the specifications. Currently, there is a lack of a hydrogen chloride absorption system capable of intelligent pressure control and multiple safety protection functions. Utility Model Content

[0003] To address the aforementioned shortcomings of existing technologies, this utility model provides a hydrogen chloride absorption system with intelligent pressure control as follows:

[0004] The technical solution of this utility model is implemented as follows:

[0005] A hydrogen chloride absorption system with intelligent pressure control includes:

[0006] The three-in-one synthesis furnace is used for the combustion reaction of hydrogen and chlorine, the cooling of hydrogen chloride gas, and the absorption of hydrochloric acid.

[0007] Chlorine gas is introduced into the pipeline and connected to the three-in-one synthesis furnace to provide chlorine gas with stable pressure and flow rate to the three-in-one synthesis furnace;

[0008] Hydrogen gas is introduced into the pipeline and connected to the three-in-one synthesis furnace to provide the three-in-one synthesis furnace with hydrogen gas at a stable pressure and flow rate.

[0009] The tail gas absorption tower is connected to the top of the three-in-one synthesis furnace and is used for secondary absorption of unreacted tail gas.

[0010] The circulating liquid system, including a circulating liquid pump, a circulating liquid tank, and an absorbent buffer tank, is used to provide dilute hydrochloric acid absorbent to the tail gas absorption tower and the three-in-one synthesis furnace.

[0011] A hydraulic jet is connected to the outlet of the exhaust gas absorption tower to establish negative pressure in the system and provide power for gas flow.

[0012] Intelligent pressure control system, including:

[0013] The pressure detection unit is located at the top of the exhaust gas absorption tower and is used to monitor the system pressure in real time.

[0014] A pressure regulating valve is installed on the outlet pipe of the circulating liquid pump;

[0015] Vent valve, connected to the top of the exhaust gas absorption tower;

[0016] The control unit receives pressure signals and controls the operation of the pressure regulating valve and the vent valve.

[0017] The safety protection system includes nitrogen purging pipelines, flame arresters, and emergency shut-off valves installed in the exhaust gas absorption tower.

[0018] Preferably, the chlorine gas inlet pipeline includes a chlorine gas buffer tank, which is connected to the main chlorine gas pipeline via a switch valve. The pipeline connecting the chlorine gas buffer tank to the three-in-one synthesis furnace is equipped with a pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester.

[0019] Preferably, the hydrogen inlet pipeline includes a hydrogen buffer tank, which is connected to the main hydrogen pipeline via a switch valve. The pipeline connecting the hydrogen buffer tank to the three-in-one synthesis furnace is equipped with a pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester.

[0020] Preferably, the three-in-one synthesis furnace is equipped with a cooling device, which includes an inner lining installed on the furnace wall. The inner lining is provided with two circulating water inlets and one circulating water return. The cooling device is also equipped with a flow control unit and a temperature display unit.

[0021] Preferably, the three-in-one synthesis furnace is equipped with a flame detection device for detecting the combustion status inside the furnace.

[0022] Preferably, the exhaust gas absorption tower is equipped with two sets of circulating liquid systems.

[0023] Preferably, the bottom of the three-in-one synthesis furnace is equipped with a substandard acid discharge pipeline, which is connected to the substandard acid tank.

[0024] Preferably, the tail gas absorption tower and the three-in-one synthesis furnace are connected by a pipeline for pumping the circulating liquid in the tail gas absorption tower into the three-in-one synthesis furnace, and a sight glass is installed in the middle of the pipeline.

[0025] Preferably, the three-in-one synthesis furnace is provided with a finished hydrochloric acid outlet, which is connected to a hydrochloric acid storage tank, and a sight glass is provided on the connected pipeline.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention discloses a hydrogen chloride absorption system with intelligent pressure control. It effectively controls the pressure at the top of the tail gas absorption tower, ensuring a negative pressure. By using a pressure gauge and regulating valve to form a closed-loop control circuit, it precisely controls the pressure at the top of the tail gas absorber, automatically adjusting the pressure to ensure optimal absorption of hydrogen chloride tail gas. This prevents excessively low pressure at the top of the absorption tower, thus avoiding accidents and ensuring the process parameters of the hydrogen chloride absorption device meet standards. Furthermore, the system controls the safety of the raw material gas before it enters the synthesis tower by controlling the pressure and flow rate of the chlorine and hydrogen gas pipelines purged with nitrogen. Attached Figure Description

[0028] Figure 1 This is a field schematic diagram of the hydrogen chloride absorption system with intelligent pressure control according to this utility model.

[0029] In the diagram: 1. Three-in-one synthesis furnace; 2. Tail gas absorption tower; 3. Chlorine buffer tank; 4. Flame arrester; 5. Hydrogen buffer tank; 6. Absorbent liquid buffer tank; 8. Sight glass; 9. Hydrochloric acid storage tank. Detailed Implementation

[0030] The present invention will now be described clearly and completely with reference to the accompanying drawings of the embodiments thereof.

[0031] like Figure 1 As shown, a hydrogen chloride absorption system with intelligent pressure control includes:

[0032] The three-in-one synthesis furnace 1 is used for the combustion reaction of hydrogen and chlorine, the cooling of hydrogen chloride gas, and the absorption of hydrochloric acid. Hydrogen and chlorine enter the three-in-one synthesis furnace 1 through their respective pipelines and are burned inside the furnace to generate hydrogen chloride gas. After being cooled in the cooling section, the gas comes into contact with dilute hydrochloric acid absorbent from the circulating liquid system in the upper absorption section to generate qualified hydrochloric acid product. The unabsorbed tail gas enters the tail gas absorption tower 2 from the top of the synthesis furnace for secondary absorption.

[0033] Chlorine gas is introduced into a pipeline and connected to the three-in-one synthesis furnace 1 to provide chlorine gas with stable pressure and flow rate to the three-in-one synthesis furnace 1. The chlorine gas introduction pipeline includes a chlorine gas buffer tank 3, which is connected to the chlorine gas main pipe through a switch valve ZV. A pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester 4 are installed on the pipeline between the chlorine gas buffer tank 3 and the three-in-one synthesis furnace 1.

[0034] A hydrogen inlet pipeline is connected to the three-in-one synthesis furnace 1 to provide hydrogen with stable pressure and flow rate to the three-in-one synthesis furnace 1. The hydrogen inlet pipeline includes a hydrogen buffer tank 5, which is connected to the main hydrogen pipeline through a switch valve ZV. A pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester 4 are installed on the pipeline between the hydrogen buffer tank 5 and the three-in-one synthesis furnace 1.

[0035] Tail gas absorption tower 2 is connected to the top of the three-in-one synthesis furnace 1 and is used for secondary absorption of unreacted tail gas.

[0036] The circulating liquid system, including a circulating liquid pump, a circulating liquid tank and an absorbent buffer tank 6, is used to provide dilute hydrochloric acid absorbent to the tail gas absorption tower 2 and the three-in-one synthesis furnace 1. The tail gas absorption tower 2 is equipped with two sets of circulating liquid systems. The two sets of circulating liquid systems can work simultaneously, and when one set has a problem and is under maintenance, the other set can continue to work to avoid unnecessary system shutdowns and affect production efficiency.

[0037] The hydraulic jet 7 is connected to the outlet of the tail gas absorption tower 2 to establish a negative pressure in the system and provide gas flow power, so that a negative pressure is generated in the tail gas absorption tower 2, ensuring that the unreacted tail gas of the three-in-one synthesis furnace 1 enters the tail gas absorption tower 2 for secondary absorption, and finally discharges the compliant tail gas into the atmosphere.

[0038] Intelligent pressure control system, including:

[0039] A pressure detection unit is installed at the top of the exhaust gas absorption tower 2 to monitor the system pressure in real time;

[0040] The pressure regulating valve PV is installed on the outlet pipe of the circulating liquid pump.

[0041] A vent valve is connected to the top of exhaust gas absorption tower 2;

[0042] The control unit receives pressure signals and controls the operation of the pressure regulating valve PV and the vent valve.

[0043] The safety protection system includes a nitrogen purging pipeline, a flame arrester 4, and an emergency shut-off valve HS installed in the tail gas absorption tower 2.

[0044] The pressure detection unit includes a pressure transmitter PT and a pressure display, control and alarm device PICA; the flow control unit includes a flow transmitter FT, a flow display controller FIC and a flow regulating valve FV; the nitrogen purging pipeline is equipped with a programmable valve HV and a shut-off valve HS.

[0045] The three-in-one synthesis furnace 1 is equipped with a cooling device, which includes an inner lining installed on the furnace wall. The inner lining is provided with two circulating water inlets and one circulating water return. The cooling device is equipped with a flow control unit and a temperature display unit, which includes a temperature sensor TE and a temperature display TI.

[0046] The three-in-one synthesis furnace 1 is equipped with a flame detection device for detecting the combustion situation inside the furnace. The flame detection device includes a flame sensor BX and a flame detection system BSA.

[0047] The bottom of the three-in-one synthesis furnace 1 is equipped with a substandard acid discharge pipeline, which is connected to the substandard acid tank for periodic discharge of substandard acid.

[0048] The tail gas absorption tower 2 is connected to the three-in-one synthesis furnace 1 through a pipeline, which is used to pump the circulating liquid in the tail gas absorption tower 2 into the three-in-one synthesis furnace 1. A sight glass 8 is installed in the middle of the pipeline.

[0049] The three-in-one synthesis furnace 1 is equipped with a finished hydrochloric acid outlet, which is connected to a hydrochloric acid storage tank 9, and a sight glass 8 is installed on the connected pipeline.

[0050] The specific process of the absorption system is as follows:

[0051] Hydrogen and chlorine enter the three-in-one synthesis furnace 1 through their respective pipelines, where they are combusted to produce hydrogen chloride gas. After being cooled in the cooling section, the gas contacts a dilute hydrochloric acid absorbent from the circulating liquid system in the upper absorption section, producing qualified hydrochloric acid product. Incompletely absorbed tail gas enters the tail gas absorption tower 2 from the top of the synthesis furnace for secondary absorption. The circulating liquid system provides a dilute mixed solution of pure water and hydrochloric acid as the absorbent, which is pumped to each absorption section. A hydraulic ejector 7 is connected to the outlet of the tail gas absorption tower 2, using liquid flow to establish negative pressure in the system and promote gas flow.

[0052] Gas from the gas-liquid separator of the three-in-one synthesis furnace 1 that has not been absorbed by hydrogen chloride enters the middle of the tail gas absorption tower 2. The absorbent liquid, after being metered by a flow meter, is sprayed down from the top of the tower. The hydrogen chloride in the tail gas is continuously absorbed by dilute acid. The dilute hydrochloric acid comes out from the bottom of the tail gas absorption tower 2, passes through a liquid seal, and flows into the top of the three-in-one synthesis furnace 1 as the absorption liquid for synthesis. The gas coming out of the separation chamber of the tail gas absorption tower 2 is led out through the water jet injector 7 and into the absorbent buffer 6. The pressure at the top of the tail gas absorption tower 1 is controlled by a circulating liquid pump through a pressure regulating valve, forming a control loop with the gas phase pressure at the top of the tail gas absorption tower 2. If the pressure is too high, it is vented through the vent valve. The pressure at the top of the tail gas absorption tower 2 is precisely controlled by the regulating valve to ensure that the pressure at the top of the tail gas absorber 2 is normal. The hydrogen chloride tail gas is regulated by the circulating liquid pressure control.

[0053] Based on the structure and process flow of this utility model, the intelligent pressure-controlled hydrogen chloride absorption system can effectively control the pressure at the top of the tail gas absorption tower, ensuring that the pressure at the top of the tail gas absorption tower remains negative. By using a pressure gauge and regulating valve to form a closed-loop control circuit, the pressure at the top of the tail gas absorber can be precisely controlled, automatically adjusting the pressure at the top of the tail gas absorption tower to ensure that the hydrogen chloride tail gas is absorbed under optimal conditions. At the same time, it avoids excessively low pressure at the top of the tail gas absorption tower, which could cause accidents, and ensures that the process indicators of the hydrogen chloride absorption device meet the standards. The safety of the raw material gas before entering the synthesis tower is controlled by the controllable pressure and flow rate of the chlorine gas inlet pipeline and the nitrogen-purged chlorine gas inlet pipeline.

Claims

1. A hydrogen chloride absorption system with intelligent pressure control, characterized in that, include: The three-in-one synthesis furnace is used for the combustion reaction of hydrogen and chlorine, the cooling of hydrogen chloride gas, and the absorption of hydrochloric acid. Chlorine gas is introduced into the pipeline and connected to the three-in-one synthesis furnace to provide chlorine gas with stable pressure and flow rate to the three-in-one synthesis furnace; Hydrogen gas is introduced into the pipeline and connected to the three-in-one synthesis furnace to provide the three-in-one synthesis furnace with hydrogen gas at a stable pressure and flow rate. The tail gas absorption tower is connected to the top of the three-in-one synthesis furnace and is used for secondary absorption of unreacted tail gas. The circulating liquid system, including a circulating liquid pump, a circulating liquid tank, and an absorbent buffer tank, is used to provide dilute hydrochloric acid absorbent to the tail gas absorption tower and the three-in-one synthesis furnace. A hydraulic jet is connected to the outlet of the exhaust gas absorption tower to establish negative pressure in the system and provide power for gas flow. Intelligent pressure control system, including: The pressure detection unit is located at the top of the exhaust gas absorption tower and is used to monitor the system pressure in real time. A pressure regulating valve is installed on the outlet pipe of the circulating liquid pump; Vent valve, connected to the top of the exhaust gas absorption tower; The control unit receives pressure signals and controls the operation of the pressure regulating valve and the vent valve. The safety protection system includes nitrogen purging pipelines, flame arresters, and emergency shut-off valves installed in the exhaust gas absorption tower.

2. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The chlorine gas inlet pipeline includes a chlorine gas buffer tank, which is connected to the main chlorine gas pipeline via a switch valve. The pipeline connecting the chlorine gas buffer tank to the three-in-one synthesis furnace is equipped with a pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester.

3. The hydrogen chloride absorption system with intelligent pressure control as described in claim 2, characterized in that, The hydrogen inlet pipeline includes a hydrogen buffer tank, which is connected to the main hydrogen pipeline via a switch valve. The pipeline connecting the hydrogen buffer tank to the three-in-one synthesis furnace is equipped with a pressure detection unit, a flow control unit, a nitrogen purging pipeline, and a flame arrester.

4. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The three-in-one synthesis furnace is equipped with a cooling device, which includes an inner lining installed on the furnace wall. The inner lining has two circulating water inlets and one circulating water return. The cooling device is equipped with a flow control unit and a temperature display unit.

5. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The three-in-one synthesis furnace is equipped with a flame detection device to detect the combustion situation inside the furnace.

6. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The tail gas absorption tower is equipped with two sets of circulating liquid systems.

7. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The bottom of the three-in-one synthesis furnace is equipped with a substandard acid discharge pipeline, which is connected to the substandard acid tank.

8. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The tail gas absorption tower is connected to the three-in-one synthesis furnace via a pipeline, which is used to pump the circulating liquid in the tail gas absorption tower into the three-in-one synthesis furnace. A sight glass is installed in the middle of the pipeline.

9. The hydrogen chloride absorption system with intelligent pressure control as described in claim 1, characterized in that, The three-in-one synthesis furnace is equipped with a finished hydrochloric acid outlet, which is connected to a hydrochloric acid storage tank, and a sight glass is installed on the connected pipeline.

Images