Hydrogenation column nitrogen heating system

Abstract

The utility model provides a hydrogenation tower nitrogen gas heating system relates to the technical field of chemical production, solves the hydrogenation tower internal hydrogenation liquid heating measure of lacking under the long -term parking state of existing device, is easy to cause the problem of hydrogenation tower internal hydrogenation liquid precipitation. The utility model discloses a hydrogenation tower, the gas inlet end of hydrogenation tower is connected with hydrogen pipe, the nitrogen gas pipe is connected with the shunt on hydrogen pipe, the nitrogen gas heater's pipe connection is connected with nitrogen gas pipe, the shell side of nitrogen gas heater is connected with steam pipe, steam condensate pipe, be provided with nitrogen gas temperature monitoring unit on the nitrogen gas pipe between nitrogen gas heater and hydrogen pipe, be provided with steam solenoid regulating valve group on steam pipe, be provided with nitrogen gas solenoid regulating valve group on the nitrogen gas pipe of nitrogen gas heater inlet end. The utility model has the advantages of: through the nitrogen gas of heating, continuously give hydrogenation liquid heating, guarantee the hydrogenation liquid temperature in hydrogenation tower under the parking state in normal range, prevent hydrogenation liquid anthraquinone precipitation.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a nitrogen heating system for a hydrogenation tower. Background Technology

[0002] Hydrogenation towers are primarily used in chemical production for hydrogenation reactions, providing a reaction site for hydrogen to react with raw materials. For example, in hydrogen peroxide production, the hydrogenation tower is a core piece of equipment in fluidized bed processes. It allows hydrogen and working fluid to be introduced together into the bottom of the tower, where a hydrogenation reaction takes place under specific pressure and temperature to obtain a corresponding hydroanthraquinone (HEAQ) solution (hereinafter referred to as hydrogenated liquid). After entering the oxidation tower, the hydrogenated liquid is oxidized by air, restoring the hydroanthraquinone in the solution to its original form, while simultaneously generating hydrogen peroxide. However, during production, when the unit is shut down for extended periods, the lack of heating measures for the hydrogenated liquid inside the tower can easily lead to precipitation of the hydrogenated liquid inside the tower, especially at low ambient temperatures. In severe cases, this can cause excessively high pressure differential in the primary membrane filter, clogging the membrane channels and preventing the system from establishing circulation. Utility Model Content

[0003] The purpose of this invention is to solve the problem that in existing chemical production, when the equipment is shut down for a long time, there is a lack of heating measures for the hydrogenated liquid inside the hydrogenation tower. When the ambient temperature is low, the hydrogenated liquid inside the hydrogenation tower is prone to precipitation. In severe cases, this can cause excessive pressure differential of the primary membrane filter and blockage of the membrane channel, resulting in the system being unable to establish circulation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A nitrogen heating system for a hydrogenation tower, characterized in that: it includes a hydrogenation tower, the inlet end of which is connected to a hydrogen pipe, a nitrogen pipe is branched onto the hydrogen pipe, a nitrogen heater is connected to the nitrogen pipe, the tube side of the nitrogen heater is connected to the nitrogen pipe, the shell side of the nitrogen heater is connected to a steam pipe and a steam condensate pipe, a nitrogen temperature monitoring unit is installed on the nitrogen pipe between the nitrogen heater and the hydrogen pipe, a steam electromagnetic regulating valve group is installed on the steam pipe, a nitrogen electromagnetic regulating valve group is installed on the nitrogen pipe at the inlet end of the nitrogen heater, the nitrogen temperature monitoring unit is electrically connected to a central control room, and the central control room is electrically connected to the steam electromagnetic regulating valve group and the nitrogen electromagnetic regulating valve group.

[0006] A further improvement is that a hydrogenation tower temperature monitoring unit is installed at the bottom of the hydrogenation tower, and the hydrogenation tower temperature monitoring unit is electrically connected to the central control room.

[0007] A further improvement is that the hydrogen pipe is connected to the main hydrogen pipe in the boundary area.

[0008] A further improvement is that the nitrogen pipe is connected to the main nitrogen pipe in the boundary area.

[0009] A further improvement is that the steam pipe is connected to the low-pressure steam main in the boundary area.

[0010] A further improvement is that the steam condensate pipe is connected to the low-pressure steam condensate recovery main pipe in the boundary area.

[0011] A further improvement is that the nitrogen temperature monitoring unit includes a temperature transmitter TT, a temperature sensing element TE, a temperature indicating instrument Ti, and a local thermometer TG.

[0012] A further improvement is that a one-way ball valve and a shut-off valve are connected to the nitrogen pipe between the nitrogen temperature monitoring unit and the hydrogen pipe.

[0013] A further improvement is that a one-way ball valve and a shut-off valve are connected to the hydrogen pipe between the main hydrogen pipe and the nitrogen pipe.

[0014] A further improvement is that both the steam electromagnetic regulating valve assembly and the nitrogen electromagnetic regulating valve assembly include an electromagnetic regulating valve and a shut-off valve.

[0015] Compared with existing technologies, the above technical solution has the following advantages:

[0016] Compared to the existing method where the hydrogenated liquid inside the hydrogenation tower cannot be heated during shutdown, a newly added nitrogen heater heats the nitrogen gas. The hot nitrogen gas then enters the hydrogenation tower through a circulating hydrogen pipeline at the bottom to heat the hydrogenated liquid. Through a temperature monitoring unit and a central control room working in conjunction with the regulating valve group, the nitrogen temperature can be monitored and precisely controlled in real time, continuously raising the temperature of the hydrogenated liquid until the required process temperature is reached. In this way, the heated nitrogen gas can continuously raise the temperature of the hydrogenated liquid, ensuring that the temperature of the hydrogenated liquid inside the hydrogenation tower remains within the normal range during shutdown, and preventing the precipitation of anthraquinone from the hydrogenated liquid. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the system structure of this utility model;

[0019] Figure 2 This is a schematic block diagram of the circuit principle structure of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Hydrogenation tower; 2. Hydrogen pipe; 3. Nitrogen pipe; 4. Nitrogen heater; 5. Steam pipe; 6. Steam condensate pipe; 7. Nitrogen temperature monitoring unit; 8. Steam electromagnetic regulating valve group; 9. Nitrogen electromagnetic regulating valve group; 10. Central control room; 11. Hydrogenation tower temperature monitoring unit; 12. Steam drain valve. Detailed Implementation

[0021] See Figures 1-2 As shown, the technical solution adopted in this specific embodiment is: a nitrogen heating system for a hydrogenation tower, characterized in that: it includes a hydrogenation tower 1, the inlet end of which is connected to a hydrogen pipe 2, a nitrogen pipe 3 is connected to the hydrogen pipe 2, a nitrogen heater 4 is connected to the nitrogen pipe 3, the tube side of the nitrogen heater 4 is connected to the nitrogen pipe 3, the shell side of the nitrogen heater 4 is connected to a steam pipe 5 and a steam condensate pipe 6, a nitrogen temperature monitoring unit 7 is installed on the nitrogen pipe 3 between the nitrogen heater 4 and the hydrogen pipe 2, a steam electromagnetic regulating valve group 8 is installed on the steam pipe 5, a nitrogen electromagnetic regulating valve group 9 is installed on the nitrogen pipe 3 at the inlet end of the nitrogen heater 4, the nitrogen temperature monitoring unit 7 is electrically connected to a central control room 10, and the central control room 10 is electrically connected to the steam electromagnetic regulating valve group 8 and the nitrogen electromagnetic regulating valve group 9.

[0022] The hydrogenation tower 1 is equipped with a hydrogenation tower temperature monitoring unit 11 at its bottom, and the hydrogenation tower temperature monitoring unit 11 is electrically connected to the central control room 10.

[0023] The nitrogen heater 4 is equipped with a steam drain valve 12.

[0024] The hydrogen pipe 2 is connected to the main hydrogen pipe in the boundary area.

[0025] The nitrogen pipe 3 is connected to the nitrogen main pipe of the boundary area.

[0026] The steam pipe 5 is connected to the low-pressure steam main in the boundary area.

[0027] The steam condensate pipe 6 is connected to the low-pressure steam condensate recovery main pipe in the boundary area.

[0028] The nitrogen temperature monitoring unit 7 includes a temperature transmitter TT, a temperature sensing element TE, a temperature indicating instrument Ti, and a local thermometer TG.

[0029] The nitrogen pipe 3 between the nitrogen temperature monitoring unit 7 and the hydrogen pipe 2 is connected to a one-way ball valve and a shut-off valve.

[0030] The hydrogen pipe 2 between the main hydrogen pipe and the nitrogen pipe 3 is connected to a one-way ball valve and a shut-off valve.

[0031] The steam electromagnetic regulating valve group 8 and the nitrogen electromagnetic regulating valve group 9 both include electromagnetic regulating valves and shut-off valves.

[0032] The working principle of this invention is as follows: After a long-term system shutdown, the central control room observes the temperature at the bottom of the hydrogenation tower. When the bottom temperature is below 35℃, the valve from the nitrogen heater to the hydrogenation tower is opened on-site. The nitrogen flow rate is controlled by the nitrogen electromagnetic regulating valve group, and the pressure at the top of the hydrogenation tower is maintained. The steam drain valve of the nitrogen heater is slowly opened to drain the condensate from the steam pipeline. After the condensate inside the steam pipeline is drained, the central control room controls the outlet temperature of the nitrogen heater at 40-45℃ through the steam electromagnetic regulating valve group for nitrogen heating. The nitrogen is heated by the newly added nitrogen heater, and then the hot nitrogen enters the hydrogenation tower from the bottom of the hydrogenation tower through the circulating hydrogen pipeline to heat the hydrogenated liquid. Through the temperature monitoring unit and the coordination of the central control room and the regulating valve group, the nitrogen temperature is monitored and precisely controlled in real time, and the temperature of the hydrogenated liquid is continuously increased until the required process temperature is reached.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions provided are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents. Any aspects of this utility model not detailed herein are well-known to those skilled in the art.

Claims

1. A nitrogen heating system for a hydrogenation tower, characterized in that: The system includes a hydrogenation tower, with a hydrogen pipe connected to its inlet. A nitrogen pipe is branched off from the hydrogen pipe, and a nitrogen heater is connected to the nitrogen pipe. The tube side of the nitrogen heater is connected to the nitrogen pipe, and the shell side of the nitrogen heater is connected to a steam pipe and a steam condensate pipe. A nitrogen temperature monitoring unit is installed on the nitrogen pipe between the nitrogen heater and the hydrogen pipe. A steam electromagnetic regulating valve group is installed on the steam pipe, and a nitrogen electromagnetic regulating valve group is installed on the nitrogen pipe at the inlet of the nitrogen heater. The nitrogen temperature monitoring unit is electrically connected to a central control room, and the central control room is electrically connected to the steam electromagnetic regulating valve group and the nitrogen electromagnetic regulating valve group.

2. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: A hydrogenation tower temperature monitoring unit is installed at the bottom of the hydrogenation tower, and the hydrogenation tower temperature monitoring unit is electrically connected to the central control room.

3. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: The hydrogen pipe is connected to the main hydrogen pipe in the boundary area.

4. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: The nitrogen pipe is connected to the main nitrogen pipe in the boundary area.

5. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: The steam pipe is connected to the low-pressure steam main in the boundary area.

6. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: The steam condensate pipe is connected to the low-pressure steam condensate recovery main pipe in the boundary area.

7. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: The nitrogen temperature monitoring unit includes a temperature transmitter, a temperature detection element, a temperature indicating instrument, and a local thermometer.

8. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: A one-way ball valve and a shut-off valve are connected to the nitrogen pipe between the nitrogen temperature monitoring unit and the hydrogen pipe.

9. The nitrogen heating system for the hydrogenation tower according to claim 3, characterized in that: A one-way ball valve and a shut-off valve are connected to the hydrogen pipe between the main hydrogen pipe and the nitrogen pipe.

10. The nitrogen heating system for the hydrogenation tower according to claim 1, characterized in that: Both the steam electromagnetic regulating valve group and the nitrogen electromagnetic regulating valve group include electromagnetic regulating valves and shut-off valves.

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