Device for heating and flushing low-temperature blast furnace gas
By setting up a spray pipe in the low-temperature section to flush the heat exchange pipe, the problem of wet ash adhesion during the heating of the low-temperature blast furnace gas is solved, the heat exchange surface is cleaned and blocked and corrosion is prevented, and the heat exchange efficiency is improved.
Patent Information
- Application Number
- CN202422380055.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During the heating process of low-temperature blast furnace gas, mechanical water and dust condense on the heat exchange surface, resulting in blockage and corrosion, affecting the heat exchange efficiency.
Set up a spray pipe in the low-temperature section to flush the heat exchange pipe, use high-pressure water to clean the surface of the heat exchange pipe, and combine the use of the snake-shaped pipe structure and the use of the heat medium to ensure the cleanliness of the heat exchange surface.
It effectively prevents wet ash from adhesion, keeps the heat exchange surface clean, avoids blockage and corrosion, and improves heat exchange efficiency.
Smart Images
Figure CN223074201U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blast furnace gas waste heat recovery devices, and particularly relates to a device for heating and flushing low-temperature blast furnace gas. Background Art
[0002] The flue gas discharged from the blast furnace hot blast stove has a temperature of about 300°C. Recycling the heat of the discharged flue gas can heat the blast furnace gas and combustion-supporting air entering the hot blast stove for combustion, which is the double preheating of the blast furnace hot blast stove.
[0003] Blast furnace gas contains a certain amount of moisture. At low temperatures, the moisture will condense and turn into mechanical water (free water droplets) and precipitate. At the same time, blast furnace gas contains a certain amount of dust. At low temperatures, the mechanical water and dust combine to form wet ash. When using a heat exchanger to heat blast furnace gas, in the low-temperature section at the blast furnace gas inlet, due to the mechanical water not having enough time to evaporate, the wet ash will adhere to the heat transfer surface, affecting heat transfer. At the same time, it will also block and corrode the heat transfer surface (because blast furnace gas may also contain a certain amount of elements such as sulfur and chlorine). Summary of the Utility Model
[0004] Purpose of the utility model: To solve the defects of the prior art, the utility model provides a device for heating and flushing low-temperature blast furnace gas.
[0005] Technical solution: To achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A device for heating and flushing low-temperature blast furnace gas, including heat exchange tubes and spray pipes. The heat exchange tubes and spray pipes are arranged in the blast furnace gas flow channel. The heat exchange tubes are arranged in several rows along the blast furnace gas flow direction. At the low-temperature section at the blast furnace gas inlet, a spray pipe is arranged above each row of heat exchange tubes. Water with a certain pressure passes through the spray pipe and can flush the heat exchange tubes below. A flowing heat medium passes through the heat exchange tubes.
[0007] As an improvement, a water receiving hopper is provided below the heat exchange tubes.
[0008] As a specific implementation, the heat exchange tubes are smooth tubes or finned tubes.
[0009] As a specific implementation, the rows of heat exchange tubes are arranged in a staggered or in-line arrangement.
[0010] As a specific implementation, the heat exchange tubes are a group of serpentine tubes, provided with a heat medium inlet and a heat medium outlet.
[0011] As a specific implementation, the temperature of the water in the spray pipe is higher than the ambient temperature.
[0012] Beneficial effects: Compared with the prior art, for the blast furnace gas heater of the present utility model, spray pipes are arranged above each row of heat exchange pipes in the low-temperature section. During the shutdown period (short-term stop of operation) of the hot blast stove, water with a certain pressure is introduced into the spray pipes to wash the heat exchange pipes below, which can effectively keep the heat exchange surface clean. The device has a simple structure and takes into account factors such as reliability and cost. Brief Description of the Drawings
[0013] Figure 1 It is a schematic structural diagram of the device of the present utility model (each row of heat exchange pipes is arranged in a staggered pattern).
[0014] Figure 2 It is a schematic structural diagram of the device of the present utility model (each row of heat exchange pipes is arranged in an in-line pattern). Detailed Embodiment
[0015] The following further describes the device of the present utility model with reference to the drawings.
[0016] In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent.
[0017] Embodiment 1
[0018] A device for heating and washing low-temperature blast furnace gas, as Figure 1 and Figure 2 shown, includes heat exchange pipes 1, spray pipes 2 and water receiving hoppers 3.
[0019] The heat exchange pipes 1 and the spray pipes 2 are arranged in the blast furnace gas flow channel. The heat exchange pipes 1 are arranged in several rows along the blast furnace gas flow direction. In the low-temperature section at the blast furnace gas inlet, spray pipes 2 are arranged above each row of heat exchange pipes 1. Water with a certain pressure is passed through the spray pipes 2, which can wash the heat exchange pipes 1 below (several nozzles are provided at the lower part of the pipe wall of the spray pipes 2). A flowing heat transfer medium is passed through the heat exchange pipes 2. A water receiving hopper 3 is provided below the heat exchange pipes 1. Above the spray pipes 2, there is a top cover 4 of the heat exchanger housing, which can be partially opened during furnace shutdown for checking the cleaning situation and for thorough cleaning.
[0020] The heat exchange pipes 1 are smooth pipes or finned pipes. The rows of the heat exchange pipes 1 can be arranged in a staggered pattern, as Figure 1 shown, or in an in-line pattern, as Figure 2 shown.
[0021] As a specific implementation, the heat exchange tube 1 can be a group of serpentine tubes, provided with a heat medium inlet and a heat medium outlet. As a preferred solution, the water in the spray pipe 2 is hot water.
[0022] When using the heat exchanger to heat blast furnace gas, in the low-temperature section at the blast furnace gas inlet, due to the mechanical water not having enough time to evaporate, wet ash will adhere to the heat transfer surface, affecting heat transfer and at the same time having a corrosive effect on the heat transfer surface. In this device, the spray pipe 2 is arranged in the low-temperature section at the blast furnace gas inlet, and it can spray hot water to wash the surface of the heat exchange tube 1 below, effectively cleaning the heat transfer surface, with a simple structure, high cleaning efficiency and low cost.
[0023] Although the present utility model has been described in detail with general descriptions and specific implementations above, based on the present utility model, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.
Claims
1. A device for heating and flushing low-temperature blast furnace gas, characterized in that It includes heat exchange tubes (1) and spray pipes (2). The heat exchange tubes (1) and spray pipes (2) are arranged in the blast furnace gas flow channel. The heat exchange tubes (1) are arranged in several rows along the blast furnace gas flow direction. In the low-temperature section at the blast furnace gas inlet, spray pipes (2) are arranged above each row of heat exchange tubes (1). Water with a certain pressure flows through the spray pipes (2), which can wash the heat exchange tubes (1) below. A flowing heat transfer medium flows through the heat exchange tubes (1).
2. The device for heating and flushing low-temperature blast furnace gas according to claim 1, characterized in that, A water receiving hopper (3) is arranged below the heat exchange tubes (1).
3. The device for heating and flushing low-temperature blast furnace gas according to claim 1, characterized in that, The heat exchange tubes (1) are smooth tubes or finned tubes.
4. The device for heating and flushing low-temperature blast furnace gas according to claim 1, characterized in that, The various rows of heat exchange tubes (1) are arranged in a staggered or in-line layout.
5. The device for heating and flushing low-temperature blast furnace gas according to claim 1, characterized in that, The heat exchange tubes (1) are a group of serpentine tubes, provided with a heat transfer medium inlet and a heat transfer medium outlet.
6. The device for heating and flushing low-temperature blast furnace gas according to claim 1, characterized in that, The temperature of the water in the spray pipes (2) is higher than the ambient temperature.