An activated furnace superheated steam temperature control system

Abstract

The utility model discloses an activation furnace superheated steam temperature control system, including high temperature steam main pipeline, high temperature steam main pipeline connects direct discharge pipe, buffer tank, throttle valve and high temperature steam total output pipeline in proper order, high temperature steam main pipeline still has the heat exchanger through the three -way valve intercommunication, and the steam output end of heat exchanger is connected direct discharge pipe through high temperature steam pipeline, and high temperature steam main pipeline still has the branch pipe, and the medium input end of heat exchanger is communicated through booster pump with branch pipe, and the cut -off output of heat exchanger is provided with circulating line, and installs pressure -relief valve on circulating line. The activation furnace superheated steam temperature control system, through the steam shunt mode, a part of steam is used as heat medium after compression and temperature rise, and another part of steam is used as fluid and is heated by heat exchange, which is low in cost and different from electric heating and other modes, achieves the purpose of pipeline steam temperature control through different modes, solves the problem of heat loss caused by long steam pipeline conveying distance and inability to meet production demand.

Description

Technical Field

[0001] This utility model relates to the field of steam temperature control technology, specifically a superheated steam temperature control system for an activation furnace. Background Technology

[0002] Steam is mainly used in the activation process of activated carbon in the activated carbon activation furnace. It is one of the core media of the physical activation method. The activation of activated carbon is a process of forming a rich pore structure in the carbon material through physical or chemical methods.

[0003] The core reaction of steam activation (physical activation method) is: C + H₂O(g) → CO + H₂;

[0004] High-temperature conditions: The temperature inside the activation furnace is typically maintained at 800-1000℃, causing water vapor to undergo an oxidation-reduction reaction with the carbon material; Pore formation mechanism:

[0005] Etching effect: Water vapor reacts with carbon atoms on and inside the carbon surface to etch out micropores and mesopores, increasing the specific surface area (which can reach 500-2000 m² / g).

[0006] Pore ​​expansion and connectivity: When the gases (CO, H2, etc.) produced by the reaction escape, they drive the original pores to expand and form interconnected channels, thereby improving the adsorption performance;

[0007] Introducing CO2 and water vapor can also act as an activator.

[0008] In the activated carbon activation process, the source of steam needs to be determined according to the specific production process and equipment configuration. Common sources include the following:

[0009] 1. External steam supply network

[0010] When large-scale production enterprises or industrial parks have centralized heating systems, they are often directly connected to external steam networks, which is suitable for activation processes with high steam demand and continuous production (such as industrial-grade activated carbon production).

[0011] 2. Steam generated by self-built boiler

[0012] Small and medium-sized enterprises, or those with special requirements for steam parameters (such as pressure and purity), often build their own steam boilers.

[0013] Steam is transported long distances to the activation furnace via pipelines, during which its temperature is lost. This temperature loss is related to various factors, such as ambient temperature and pressure. When the steam arrives at the activation furnace, there is a temperature difference between the steam and the required temperature, which does not meet production needs. Therefore, the existing technology is improved to increase the steam temperature in an energy-efficient manner while keeping the pressure constant. Summary of the Invention

[0014] The purpose of this invention is to provide a superheated steam temperature control system for an activation furnace to solve the problems mentioned in the background art.

[0015] To achieve the above objectives, this utility model provides the following technical solution:

[0016] A superheated steam temperature control system for an activation furnace includes a high-temperature steam main pipeline, which is sequentially connected to a straight discharge pipe, a buffer tank, a throttling valve, and a high-temperature steam main output pipeline. The high-temperature steam main pipeline is also connected to a heat exchanger via a three-way valve. The steam output end of the heat exchanger is connected to the straight discharge pipe via the high-temperature steam pipeline. The high-temperature steam main pipeline is also connected to a branch pipe, which is connected to the medium input end of the heat exchanger via a booster pump. A circulation line is provided at the cut-off output end of the heat exchanger, and a pressure relief valve is installed on the circulation line.

[0017] As a further improvement of this utility model, a flow control valve for controlling the steam flow rate of the branch pipe is installed on the branch pipe.

[0018] As a further embodiment of this utility model: the heat exchanger is divided into a fluid cavity and a medium cavity. The bottom of the fluid cavity and the medium cavity are respectively connected to a condensate tank through pipelines. A drain valve is installed at the bottom of the condensate tank and is connected to a drain pipeline.

[0019] As a further improvement of this utility model, a one-way valve to prevent steam backflow is installed at the connection between the straight pipe and the high-temperature steam pipeline.

[0020] As a further improvement of this utility model: sensor group a is installed on the high-temperature steam main pipeline, sensor group b capable of detecting the temperature of the medium is installed in the heat exchanger, and sensor group c is installed on the high-temperature steam pipeline.

[0021] As a further embodiment of this invention: the sensor group a, sensor group b and sensor group c are configured identically, and each sensor group is configured with at least a pressure sensor and a temperature sensor.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This superheated steam temperature control system for the activation furnace achieves pipeline steam temperature control through a steam diversion method. One part of the steam is compressed and heated to serve as a heat medium, while the other part of the steam is heated by heat exchange as a fluid. This method is low-cost and, unlike electric heating and other methods, achieves the purpose of pipeline steam temperature control through different means. It solves the problem of heat loss caused by long steam pipeline transportation distances, which cannot meet production needs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a superheated steam temperature control system for an activation furnace.

[0025] In the diagram: 1. High-temperature steam main pipeline; 2. Three-way valve; 3. Straight pipe; 4. High-temperature steam main output pipeline; 5. Buffer tank; 6. Throttling valve; 7. Flow control valve; 8. Control branch pipe; 9. Condensate tank; 10. Drainage pipeline; 11. Heat exchanger; 12. Booster pump; 13. Sensor group a; 14. Pressure relief valve; 15. Sensor group b; 16. Circulation line; 17. Sensor group c; 18. High-temperature steam pipeline. Detailed Implementation

[0026] Please see Figure 1 In this embodiment of the invention, a superheated steam temperature control system for an activation furnace includes a high-temperature steam main pipeline 1. The high-temperature steam main pipeline 1 is sequentially connected to a straight discharge pipe 3, a buffer tank 5, a throttle valve 6, and a high-temperature steam main output pipeline 4. The high-temperature steam main pipeline 1 is also connected to a heat exchanger 11 via a three-way valve 2. The steam output end of the heat exchanger 11 is connected to the straight discharge pipe 3 via a high-temperature steam pipeline 18. The high-temperature steam main pipeline 1 is also connected to a branch pipe 8, which is connected to the medium input end of the heat exchanger 11 via a booster pump 12. The heat exchanger 11 has a circulation line 16 at its shut-off output end, and a pressure relief valve 14 is installed on the circulation line 16. The superheated steam temperature control system includes a control terminal. Steam is input through the high-temperature steam main pipeline 1 and output through the high-temperature steam main output pipeline 4. When the steam temperature of the high-temperature steam main pipeline 1 is lower than the production requirement, the pipeline is switched through the three-way valve 2, allowing steam to enter the medium cavity of the heat exchanger 11 through the branch pipe 8. Under the compression of the booster pump 12, the steam temperature rises, and this portion of the steam with the increased temperature is used as the heat medium. A flow control valve 7 is installed on branch pipe 8 to control the steam flow rate of branch pipe 8. By adjusting the opening of the three-way valve 2 and the flow control valve 7, a portion of the steam enters the fluid cavity of the heat exchanger 11 and exchanges heat with the high-temperature steam in the medium cavity, thereby increasing the temperature of the steam in the fluid cavity. After the steam in the fluid cavity rises to the target temperature through heat exchange, it is sent from the high-temperature steam pipeline 18 to the buffer tank 5 and then output from the high-temperature steam total output pipeline 4. Since some steam is sent back to reboiler or vented from the circulation line 16, the outflow of some steam leads to a decrease in steam pressure. In order to maintain the steam pressure, a throttle valve 6 is set to reduce the steam output, so that the pressure in the buffer tank 5 increases and the output is stable. This application divides the steam, with some steam being compressed and heated as a heat medium, and some steam being heated as a fluid through heat exchange. It is low-cost and different from electric heating and other methods. It achieves the purpose of pipeline steam temperature control through different methods, solving the problem of heat loss caused by long steam pipeline transportation distance, which cannot meet production needs.

[0027] In a preferred embodiment, the heat exchanger 11 is divided into a fluid cavity and a medium cavity. The bottoms of the fluid cavity and the medium cavity are respectively connected to a condensate tank 9 via pipelines. A drain valve is installed at the bottom of the condensate tank 9, and the drain valve is connected to the drain pipeline 10. During the heat exchange and compression process, steam will generate a certain amount of condensate. The design of the condensate tank 9 can effectively separate the condensate. The accumulation of condensate can easily cause water hammer and create resistance to the steam transport in the pipeline. Therefore, the condensate tank 9 is set up to discharge the condensate.

[0028] In a preferred embodiment, a one-way valve to prevent steam backflow is installed at the connection between the straight pipe 3 and the high-temperature steam pipeline 18. The one-way valve, also known as a check valve, allows the medium to flow in one direction and prevents backflow.

[0029] In a preferred embodiment, sensor group a13 is installed on the high-temperature steam main pipeline 1, sensor group b15 capable of detecting the medium temperature is installed in the heat exchanger 11, and sensor group c17 is installed on the high-temperature steam pipeline 18. Sensor groups a13, b15, and c17 are all electrically connected to the control terminal. The electrical signals detected by sensor groups a13, b15, and c17 are transmitted to the control terminal through electrical connections. Sensor groups a13, b15, and c17 have the same configuration, and each sensor group is equipped with at least a pressure sensor and a temperature sensor. When the control terminal receives the temperature signal and pressure signal, it adjusts the opening or closing of each valve to adjust the delivery volume of the pipeline and each line, thereby achieving automated control.

[0030] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.

[0031] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A superheated steam temperature control system for an activation furnace, comprising a high-temperature steam main pipeline (1), wherein the high-temperature steam main pipeline (1) is sequentially connected to a straight discharge pipe (3), a buffer tank (5), a throttle valve (6), and a high-temperature steam main output pipeline (4), characterized in that, The high-temperature steam main pipeline (1) is also connected to a heat exchanger (11) via a three-way valve (2). The steam output end of the heat exchanger (11) is connected to a straight pipe (3) via a high-temperature steam pipeline (18). The high-temperature steam main pipeline (1) is also connected to a branch pipe (8). The branch pipe (8) is connected to the medium input end of the heat exchanger (11) via a booster pump (12). A circulation line (16) is provided at the cut-off output end of the heat exchanger (11). A pressure relief valve (14) is installed on the circulation line (16).

2. The superheated steam temperature control system for an activation furnace according to claim 1, characterized in that, A flow control valve (7) for controlling the steam flow of the branch pipe (8) is installed on the branch pipe (8).

3. The superheated steam temperature control system for an activation furnace according to claim 1, characterized in that, The heat exchanger (11) is divided into a fluid cavity and a medium cavity. The bottom of the fluid cavity and the medium cavity are respectively connected to the condensate tank (9) through pipelines. A drain valve is installed at the bottom of the condensate tank (9) and the drain valve is connected to the drain pipeline (10).

4. The superheated steam temperature control system for an activation furnace according to claim 1, characterized in that, One-way valves to prevent steam backflow are installed at the connection points of the straight pipe (3) and the high-temperature steam pipeline (18).

5. A superheated steam temperature control system for an activation furnace according to any one of claims 1-4, characterized in that, Sensor group a (13) is installed on the high-temperature steam main pipeline (1), sensor group b (15) capable of detecting the medium temperature is installed in the heat exchanger (11), and sensor group c (17) is installed on the high-temperature steam pipeline (18).

6. The superheated steam temperature control system for an activation furnace according to claim 5, characterized in that, The sensor groups a (13), b (15) and c (17) are configured the same, and each sensor group is configured with at least a pressure sensor and a temperature sensor.

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