A stable desulfurized coal gas pipeline network

Abstract

This utility model belongs to the technical field of sulfur-treated coal gas pipeline networks, and relates to a stable and finely desulfurized coal gas pipeline network, including a blast furnace gas pipeline network. The blast furnace gas pipeline network is connected to the blast furnace system at its front end. A TRT (Transmission Reduction Unit) and a spray cooling device are installed at the front end of the blast furnace gas pipeline network. Connecting pipes extend from the blast furnace gas pipeline network and connect to desulfurization towers. Six desulfurization towers are connected in parallel. The desulfurization towers are connected to a collecting pipe via leading pipes. The blast furnace gas pipeline network is connected to the collecting pipe via regulating pipes. A bypass regulating valve is installed on the regulating pipe. A bypass pipe is led out from the connecting pipe directly to the collecting pipe, and a bypass valve is installed on the bypass pipe. This utility model achieves precise desulfurization of blast furnace gas through parallel desulfurization tower group bypass control. The multi-tower operation ensures continuous and stable production, balances pipeline pressure, eliminates fluctuations in operating conditions, and outputs stable coal gas pressure to meet production needs.

Description

Technical Field

[0001] This utility model belongs to the technical field of sulfur gas pipeline network, specifically relating to a stable and refined sulfur gas pipeline network. Background Technology

[0002] Blast furnace gas is a byproduct of the iron and steel smelting process. It contains sulfides such as hydrogen sulfide and organic sulfur compounds. Downstream user units such as heating furnaces, hot blast stoves, and power plant boilers will experience low-temperature corrosion and scaling, shortening equipment life. After combustion, it generates harmful substances such as SO2, causing air pollution.

[0003] The mainstream process commonly used in the industry is to connect dry or wet desulfurization towers to the blast furnace gas pipeline network. During blast furnace operation, the gas production often fluctuates significantly in a short period of time due to shutdowns, forced drafts, and oxygen-enriched blast operations. The large fluctuations in blast furnace gas flow rate mean that when the blast furnace operating conditions change, the gas production suddenly increases. If the desulfurization unit's processing capacity is insufficient or the bypass valve is not opened in time, the pressure in the upstream pipeline network cannot be released in time, causing the water seal of the gas pipeline network to break down, which can easily lead to a large risk of gas leakage. Long-term overpressure in the gas pipeline network can cause weld cracks and flange sealing surface leaks, especially in weak links such as compensators and valve connections, which may lead to gas leaks, causing personnel poisoning or explosion accidents.

[0004] Therefore, there is an urgent need to develop a stable desulfurized coal gas pipeline network to ensure that the pipeline pressure remains within a safe range. Utility Model Content

[0005] The purpose of this invention is to provide a stable desulfurized coal gas pipeline network with adaptive adjustment and pressure stabilization functions, which solves the problems of pipeline overpressure, water seal breakdown and coal gas leakage caused by drastic fluctuations in blast furnace gas flow in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a stable and refined desulfurized coal gas pipeline network, including a blast furnace gas pipeline network. The front end of the blast furnace gas pipeline network is connected to the blast furnace system. A TRT unit and a spray cooling device are installed at the front end of the blast furnace gas pipeline network. A connecting pipe is led out from the blast furnace gas pipeline network and connected to the desulfurization tower. There are 6 sets of desulfurization towers connected in parallel. The desulfurization towers are connected to the collecting pipe through the leading pipe. The blast furnace gas pipeline network is connected to the collecting pipe through the regulating pipe. A bypass regulating valve is installed on the regulating pipe. A bypass pipe is led out from the connecting pipe and directly connected to the collecting pipe. A bypass valve is installed on the bypass pipe.

[0007] Preferably, the manifold is equipped with a pressure sensor and a gas composition analyzer.

[0008] Preferably, both the bypass regulating valve and the bypass valve are electrically operated regulating valves, and are electrically connected to the TRT unit.

[0009] Preferably, the inlet end of the regulating pipe is connected to the blast furnace gas pipeline network behind the TRT unit, and the inlet end of the connecting pipe is connected to the blast furnace gas pipeline network behind the spray cooling device.

[0010] Preferably, the downstream of the collection pipe is connected to a clean gas pipeline network.

[0011] Preferably, each of the desulfurization towers is equipped with an isolation valve on its inlet and outlet pipes, with the inlet of the bypass pipe connected to the front end of the desulfurization tower inlet isolation valve and the outlet of the bypass pipe connected to the manifold.

[0012] Preferably, the inner walls of the connecting pipes, regulating pipes, bypass pipes, and collecting pipes are lined with an anti-corrosion and wear-resistant layer.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. This utility model features a parallel desulfurization tower group bypass control system, which enables precise desulfurization of blast furnace gas. The operation of multiple towers ensures continuous and stable production, balances pipeline pressure, eliminates fluctuations in operating conditions, and outputs stable gas pressure to meet production needs.

[0015] 2. This utility model has adaptive adjustment and pressure stabilization functions, which solves the problems of pipeline overpressure, water seal breakdown and gas leakage caused by drastic fluctuations in blast furnace gas flow in the prior art. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a stable desulfurized coal gas pipeline network according to one embodiment;

[0018] In the diagram above, 1. Blast furnace gas pipeline network, 2. Blast furnace system, 3. TRT unit, 4. Spray cooling device, 5. Connecting pipeline, 6. Desulfurization tower, 7. Outlet pipeline, 8. Collection pipe, 9. Regulating pipeline, 10. Bypass regulating valve, 11. Bypass pipe, 12. Bypass valve, 13. Pressure sensor, 14. Gas composition analyzer, 15. Clean gas pipeline network, 16. Isolation valve. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1, as Figure 1 As shown, a stable desulfurization gas pipeline network includes a blast furnace gas pipeline network 1. The blast furnace gas pipeline network 1 is connected to the blast furnace system 2 at its front end. The blast furnace gas pipeline network 1 serves as the main transportation pipeline, transporting the crude gas from the blast furnace system 2 to subsequent processing units. A TRT unit 3 and a spray cooling device 4 are installed at the front end of the blast furnace gas pipeline network 1. The TRT unit 3, officially called a blast furnace gas residual pressure turbine power generation device, is connected to the front end of the blast furnace gas pipeline network 1 and utilizes the pressure and heat energy of the blast furnace top gas to generate electricity, achieving energy recovery. While saving energy and reducing consumption, the TRT unit 3, as the first regulating gate of the pipeline network pressure, can effectively suppress large pressure fluctuations. The spray cooling device 4 is located after the TRT unit 3 and reduces the gas temperature by spraying atomized water, providing the optimal reaction temperature for the downstream desulfurization tower 6.

[0022] A connecting pipe 5 extends from the blast furnace gas pipeline network 1, connecting to desulfurization towers 6. Six desulfurization towers 6 are connected in parallel. The connecting pipe 5 distributes the gas from the blast furnace gas pipeline network 1 to the six parallel desulfurization towers 6. Each desulfurization tower 6 is a purification unit equipped with a spray layer, a packing layer, or a dry desulfurizing agent. It removes sulfides such as H2S from the gas through physical and chemical processes. The parallel design of the six towers allows some towers to operate online while others are offline for maintenance or desulfurization agent replacement, ensuring continuous and stable operation. By activating different numbers of desulfurization towers 6, different blast furnace gas production rates can be flexibly matched.

[0023] The desulfurization tower 6 is connected to the collection pipe 8 via the outlet pipe 7. The blast furnace gas pipeline network 1 is connected to the collection pipe 8 via the regulating pipe 9. A bypass regulating valve 10 is installed on the regulating pipe 9. A bypass pipe 11 is led out from the connecting pipe 5 and directly connected to the collection pipe 8. A bypass valve 12 is installed on the bypass pipe 11. The bypass pipe 11 is directly connected to the collection pipe 8. When the blast furnace gas volume increases suddenly, exceeding the processing capacity of the desulfurization tower 6, or when the desulfurization tower 6 needs to be shut down for maintenance, the bypass valve 12 opens quickly. By providing a low-resistance, fast-response emergency pressure relief channel, when the pressure rises, the gas can bypass directly through the bypass pipe 11, instantly releasing the pipeline pressure and effectively preventing the water seal from being broken. The regulating pipe 9 leads the undesulfurized crude gas from the blast furnace gas pipeline network 1 to the collection pipe 8. The regulating pipe 9 and the bypass pipe 11 work together to achieve precise control of the pipeline pressure by combining "coarse adjustment" and "fine adjustment," maintaining pressure stability. The collecting pipe 8 collects gas from three channels: gas purified by the desulfurization tower 6, undesulfurized gas from the regulating pipe 9, and emergency bypass gas from the bypass pipe 11. After mixing, the gas is delivered to downstream users, serving as a gas manifold to ensure system pressure balance.

[0024] The specific design of the aforementioned key components will be discussed in detail below:

[0025] A pressure sensor 13 and a gas composition analyzer 14 are installed on the manifold 8. The pressure sensor 13 is preferably a pressure transmitter, with the measuring point located on a straight pipe section at least five times the pipe diameter upstream of the manifold 8 to ensure accurate pressure measurements. The gas composition analyzer 14 is an online analyzer using laser spectroscopy or ultraviolet fluorescence. Its sampling probe is located in the middle of the manifold and it is equipped with a complete sample gas pretreatment system to continuously and accurately monitor indicators such as H2S and organic sulfur. The pressure sensor 13 serves as a feedback unit for pressure control, determining the operation of the bypass valve 12 based on pressure readings. The gas composition analyzer 14 ensures that the clean gas meets emission standards, providing data support for optimizing the number of desulfurization towers 6 in operation and achieving economical operation.

[0026] Both bypass control valve 10 and bypass valve 12 are electrically operated control valves, electrically connected to the TRT unit 3. Bypass control valve 10 is a high-precision electric control valve with linear flow characteristics, enabling continuous and precise regulation from 0-100%. Bypass valve 12 is an angle-stroke electric butterfly valve; the control signal is ultimately connected to the DCS or PLC and establishes a communication interlock with the control system of the TRT unit 3. The electric actuator has a fast response speed, high control accuracy, and is easily integrated into the automatic control system program.

[0027] The inlet end of the regulating pipe 9 is connected to the blast furnace gas pipeline network 1 downstream of the TRT unit 3, and the inlet end of the connecting pipe 5 is connected to the blast furnace gas pipeline network 1 downstream of the spray cooling device 4. The gas intake point of the regulating pipe 9 is strictly set on the outlet pipe of the TRT unit 3 to obtain gas that has undergone energy recovery and whose pressure has been initially reduced. The gas intake point of the connecting pipe 5 is strictly set on the outlet pipe of the spray cooling device 4 to obtain gas whose temperature has been reduced to the range required for the desulfurization reaction.

[0028] The manifold 8 is connected downstream to the clean gas pipeline 15. The manifold 8 is connected to the downstream clean gas pipeline 15 via a flange. After the connection, the clean gas pipeline 15 is preferably equipped with a safety quick-cut valve for emergency shut-off and a gas compressor for delivery.

[0029] Each desulfurization tower 6 is equipped with an isolation valve 16 on its inlet and outlet pipes. The inlet of a bypass pipe 11 is connected to the front end of the inlet isolation valve 16 of the desulfurization tower 6, and the outlet of the bypass pipe 11 is connected to the manifold 8. Each isolation valve 16 is a hard-seal flange ball valve with excellent sealing performance. The inlet of the bypass pipe 11 is connected to the front end of the inlet isolation valve 16 of the desulfurization tower 6, close to the side of the blast furnace gas pipeline network 1. When the inlet and outlet isolation valves 16 of a certain desulfurization tower 6 are closed, the tower is completely isolated and online maintenance can be performed. The inlet of the bypass pipe 11 is located before the isolation valve 16, and the bypass pipe 11 remains unobstructed, allowing high-pressure gas to still be depressurized through the bypass pipe 11.

[0030] The inner walls of the connecting pipe 5, regulating pipe 9, bypass pipe 11, and manifold 8 are lined with an anti-corrosion and wear-resistant layer. This anti-corrosion and wear-resistant layer can be selected according to the characteristics of the medium, such as an acid-resistant glass flake resin coating, a wear-resistant and corrosion-resistant polyurea elastomer coating, or a stainless steel lining. The lining construction must ensure integrity, absence of pinholes, and a firm bond with the base material, enhancing the pipeline's corrosion resistance and erosion resistance, extending its service life, and reducing maintenance costs.

[0031] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A stable, fine-depleted sulfur gas pipe network, characterized in that, The system includes a blast furnace gas pipeline network. The blast furnace gas pipeline network is connected to the blast furnace system at its front end. A TRT unit and a spray cooling device are installed at the front end of the blast furnace gas pipeline network. A connecting pipe is led out from the blast furnace gas pipeline network and connected to a desulfurization tower. There are 6 desulfurization towers connected in parallel. The desulfurization towers are connected to a collection pipe through a lead-out pipe. The blast furnace gas pipeline network is connected to the collection pipe through a regulating pipe. A bypass regulating valve is installed on the regulating pipe. A bypass pipe is led out from the connecting pipe and directly connected to the collection pipe. A bypass valve is installed on the bypass pipe.

2. A stable fine desulfurized coal gas pipe network according to claim 1, characterized in that, The manifold is equipped with a pressure sensor and a gas composition analyzer.

3. A stable fine desulfurized coal gas pipe network according to claim 1, characterized in that, Both the bypass regulating valve and the bypass valve are electrically operated and are electrically connected to the TRT unit.

4. A stable fine desulfurized coal gas pipe network according to claim 1, characterized in that, The inlet end of the regulating pipe is connected to the blast furnace gas pipeline network behind the TRT unit, and the inlet end of the connecting pipe is connected to the blast furnace gas pipeline network behind the spray cooling device.

5. A stable fine desulfurized coal gas pipe network according to claim 2, characterized in that, The downstream of the collection pipe is connected to the clean gas pipeline network.

6. A stable fine desulfurized coal gas pipe network according to claim 1, characterized in that, Each of the desulfurization towers is equipped with an isolation valve on its inlet and outlet pipes. The inlet of the bypass pipe is connected to the front end of the isolation valve at the inlet of the desulfurization tower, and the outlet of the bypass pipe is connected to the manifold.

7. A stable fine desulfurized coal gas pipe network according to claim 1, characterized in that, The inner walls of the connecting pipes, regulating pipes, bypass pipes, and collecting pipes are lined with an anti-corrosion and wear-resistant layer.

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