Blast furnace gas condenser and condensing system

Abstract

The utility model provides a blast furnace gas condenser which comprises a tower body, tube plates and vortex section heat exchange tubes are arranged in the tower body, a condensation structure is arranged between the tube plates, the condensation structure comprises a baffle plate, a circulating water outlet and a circulating water inlet, and a gas inlet, a gas outlet, a manhole and a liquid seal device are arranged on the tower body. The blast furnace gas condensation system comprises a plurality of blast furnace gas condensers, and comprises three first condensers and three second condensers which are connected in series; the heat exchanger serving as a condensing device is simple and durable in structure, long in service life, simple to maintain and low in maintenance cost; the problem of corrosion of gas transportation pipelines can be solved; the condensing device is vertically arranged, and a condensate recovery device is arranged, so that condensate recovery and unified treatment are facilitated; a liquid seal device is arranged below the tower body to prevent gas leakage and ensure safety; the demister is arranged at the outlet of the gas pipeline to ensure the dryness of the gas; after the coal gas is dehydrated, the low-level heating value is increased.

Description

Technical Field

[0001] The utility model relates to the technical field related to blast furnace gas condensation, in particular to a blast furnace gas condenser and a condensation system. Background Art

[0002] Blast furnace gas is a by-product produced during the ironmaking process. Its main components are CO, CO2, N2, H2, CH4, etc., of which the combustible component CO accounts for about 25%, H2 and CH4 content is very small, CO and N2 content account for 15% and 55% respectively, and the calorific value is 3500kJ / m 3 During the smelting process in a blast furnace, the raw materials undergo a series of chemical reactions at high temperatures, producing gases such as hydrogen sulfide and sulfur dioxide. These gases dissolve in water to form a strong acid solution. However, the more important acidic gases dissolve in water and adhere to the pipelines, causing more complex chemical and electrochemical reactions to occur continuously, causing corrosion to the pipelines.

[0003] Currently, blast furnace gas is primarily treated using dry and wet dust removal processes. Dry dust removal technology offers multiple benefits, including energy and water conservation, reduced footprint, environmental friendliness, and reduced production costs. It is widely adopted by large, medium, and small blast furnaces. Practice has proven that, compared with traditional wet dust removal, dry dust removal reduces investment by 35%, saves 7-9 tons of circulating water per ton of iron produced, saves 30-70% in electricity, and can generate 30% more electricity. It also significantly reduces wastewater and sludge emissions. Wet dust removal removes corrosive components (such as SO₂, SO₃, Cl₂, and H₂S) from the gas through a dissolution reaction using a Venturi tube or scrubber, allowing them to enter the water treatment system. However, after dry dust removal, the corrosive components are forced to flow into the next process along with the gas. As the gas cools and condenses, they form highly corrosive acids, posing a significant safety hazard to gas pipelines. Utility Model Content

[0004] The utility model aims to provide a blast furnace gas condenser and a condensation system, which can remove condensed water and corrosive components in the gas after dry dust removal of the blast furnace gas, thereby preventing the blast furnace gas transmission pipeline from being corroded.

[0005] To this end, the technical solution adopted by the present invention is: a blast furnace gas condenser, comprising a tower body, a gas inlet is arranged at the upper end of the tower body, tube sheets are arranged at upper and lower intervals in the tower body, there is a distance between the tube sheet located at the lower side and the bottom surface of the tower body, the space formed by the distance is a condensate collection tank, vertically extending vortex heat exchange tubes are distributed between the two tube sheets, a circulating water inlet is arranged on the upper side of the side of the tower body near the lower tube sheet, and a circulating water outlet is arranged on the lower side of the tube sheet near the upper side; baffles are also arranged at left and right intervals from top to bottom between the upper and lower tube sheets, a gas outlet is arranged on the side wall of the tower body, there is a gap between the gas outlet and the bottom surface of the tower body, a condensate outlet is arranged on the bottom surface of the tower body, and a liquid sealing device is provided on the condensate outlet.

[0006] As a preferred embodiment of the above scheme, the liquid sealing device includes a U-shaped tube and a "7"-shaped tube connected to the U-shaped tube, one end of the U-shaped tube is connected to the condensate outlet through a flange, and the other end is connected to the upper end of the "7"-shaped tube, and a valve is provided in the transverse part of the "7"-shaped tube.

[0007] More preferably, a manhole for maintenance is provided at the lower side of the tower body.

[0008] More preferably, the vortex heat exchange tubes are arranged in an equilateral triangle on the tube sheet.

[0009] At the same time, the utility model also discloses a blast furnace gas condensation system, including a first condenser and a second condenser arranged in series, the first condenser and the second condenser are both the above-mentioned blast furnace gas condensers, and a wire mesh demister is connected to the gas outlet of the second condenser.

[0010] More preferably, there are three first condensers and three second condensers, and the three first condensers and the three second condensers are respectively arranged in parallel.

[0011] It is further preferred that the circulating water outlet and the circulating water inlet of the first condenser are respectively connected to the first circulating water pipe, the circulating water outlet and the circulating water inlet of the second condenser are respectively connected to the second circulating water pipe, and butterfly valves are provided on the second circulating water pipe and the first circulating water pipe. The water inlet temperature of the first circulating water pipe is between 32 and 40°C, and the water inlet temperature of the second condenser is between 7 and 12°C.

[0012] The beneficial effects of the utility model are as follows: compared with the traditional wet dust removal process, the heat exchanger is used as the condensing device, which has a simple and durable structure, a long service life, simple maintenance and low maintenance cost; it can solve the corrosion problem of the gas transportation pipeline; the condensing device is arranged vertically and is equipped with a condensate recovery device to facilitate the unified recovery and treatment of the condensate; a liquid sealing device is provided under the tower body to prevent gas leakage and ensure safety; a demister is provided at the gas pipeline outlet to ensure the dryness of the gas; after the gas is dehydrated, the low calorific value is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the condenser in the utility model.

[0014] Figure 2 yes Figure 1 A partial enlarged view of .

[0015] Figure 3 This is a schematic diagram of the distribution position of the middle vortex heat exchange tubes on the tube plate of the utility model.

[0016] Figure 4 It is a flow diagram of the condensation system in the utility model. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-4 As shown, a blast furnace gas condenser includes a tower body 1, a gas inlet 2 is provided at the upper end of the tower body 1, and tube sheets 3 are provided at upper and lower intervals in the tower body 1 (a number of mounting holes for mounting vortex heat exchange tubes matching the vortex heat exchange tubes are distributed on the tube sheets), there is a distance between the tube sheet 3 located at the lower side and the bottom surface of the tower body 1, and the space formed by the distance is a condensate collection tank 18, and vertically extending vortex heat exchange tubes 4 are distributed between the two tube sheets 3, a circulating water inlet 7 is provided on the upper side of the side of the tower body 1 near the lower tube sheet 3, and a circulating water outlet 6 is provided on the lower side of the side of the tower body 1 near the upper side of the tube sheet 3; baffles 5 are also provided at left and right intervals from top to bottom between the upper and lower tube sheets 3, a gas outlet 8 is provided on the side wall of the tower body 1, and there is a gap between the gas outlet 8 and the bottom surface of the tower body 1, a condensate outlet is provided on the bottom surface of the tower body 1, and a liquid sealing device 10 is provided on the condensate outlet.

[0019] The condenser is made of corrosion-resistant material TA2, which has high mechanical strength and hardness. It has good low-temperature toughness and high low-temperature strength and can be used as a low-temperature structural material below -253℃.

[0020] Liquid seal device 10 comprises a U-shaped tube and a "7"-shaped tube connected to the U-shaped tube. One end of the U-shaped tube is connected to the condensate outlet via a flange, and the other end is connected to the upper end of the "7"-shaped tube. A valve 11 is installed on the transverse portion of the "7"-shaped tube. The U-shaped tube liquid seal prevents the condensate from the condenser from being carried away by gas when it is discharged, and it also ensures a certain pressure in the system.

[0021] A manhole 9 for maintenance is also provided on the lower side of the tower body 1. There is also a gap between the manhole 9 and the bottom surface of the tower body 1. When the liquid level at the bottom of the tower body 1 approaches the manhole 9 door, the valve 11 on the U-shaped pipe is opened to drain the condensate. The bottom of the manhole 9 door is lower than the bottom of the gas outlet 8.

[0022] The vortex heat exchange tubes 4 are arranged in an equilateral triangle on the tube sheet 3, as shown in Figure 3 As shown in the cross-sectional view, the centers of the cross-sections of the three vortex heat exchange tubes are the three vertices of the equilateral triangle. The vortex heat exchange tubes 4 save investment costs while also reducing the equipment footprint. The equilateral triangle arrangement of the vortex heat exchange tubes 4 allows the fluid inside the tower body 1 to be fully mixed in three directions, increasing the opportunities for heat transfer. Furthermore, the heat transfer area is larger, heat transfer is faster, and the fluid velocity is more uniform, resulting in higher heat exchange efficiency, effectively improving the efficiency of heat exchange within the tower body 1.

[0023] A blast furnace gas condensation system includes a first condenser 12 and a second condenser 13 arranged in series. The first condenser and the second condenser are both the above-mentioned blast furnace gas condensers. A wire mesh demister 17 is connected to the gas outlet 8 of the second condenser 13.

[0024] A wire mesh demister 17 is installed at the gas outlet of the second condenser 13. It features low pressure drop, a large specific surface area, and high demisting efficiency. For droplets larger than 3 μm, its demisting efficiency can reach over 98%. Wire mesh demister 17 is used to remove entrained mist (droplets) from the gas, recover droplets, or purify the gas to reduce impurities.

[0025] There are three first condensers 12 and second condensers 13, and the three first condensers 12 and second condensers 13 are respectively arranged in parallel. The three first condensers 12 and second condensers 13 are connected in series to process the coal gas at the same time, which has higher processing efficiency.

[0026] The circulating water outlet 6 and circulating water inlet 7 of the first condenser 12 are respectively connected to a first circulating water pipe 14. The circulating water outlet 6 and circulating water inlet 7 of the second condenser 13 are respectively connected to a second circulating water pipe 15. Butterfly valves 16 are installed on both the second circulating water pipe 15 and the first circulating water pipe 14. The inlet temperature of the water to the first circulating water pipe 14 is between 32 and 40°C, and the inlet temperature of the water to the second condenser 13 is between 7 and 12°C. The circulating water supply is controlled by opening and closing the butterfly valves 16, facilitating equipment troubleshooting and maintenance.

[0027] Blast furnace gas flows through the tube side, facilitating the complete separation and collection of condensate; all condensate circulating water flows through the shell side. The shell-side method is suitable for large heat exchangers or applications requiring high heat transfer efficiency. By increasing the fluid volume in the shell side, a larger heat exchange area is provided, making it suitable for heat exchange with high-temperature, high-pressure, or corrosive media.

[0028] like Figure 4 As shown, 60°C saturated blast furnace gas enters three first condensers 12 respectively, and circulating water at 32-40°C enters three first condensers 12 respectively. The gas is cooled by the condensed water, and the gas temperature is reduced and a large amount of water is precipitated; after the blast furnace gas is cooled to 45°C, it enters three second condensers 15 respectively, and circulating water at 7-12°C enters the second condensers to cool the gas again. After the gas precipitates some water again, the temperature is further reduced (to about 30°C); the condenser circulating water goes through the shell process; a wire mesh demister 17 is provided at the gas outlet to further remove water mist in the gas.

[0029] Compared with the traditional wet dust removal process, the heat exchanger is used as the condensing device, which has a simple and durable structure, a long service life, simple maintenance and low maintenance cost; it can solve the corrosion problem of gas transportation pipelines; the condensing device is arranged vertically and is equipped with a condensate recovery device to facilitate the recovery and unified treatment of condensate; a liquid sealing device 10 is provided under the tower body 1 to prevent gas leakage and ensure safety; a demister is set at the gas pipeline outlet to ensure the dryness of the gas; after the gas is dehydrated, the low calorific value is increased.

[0030] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A blast furnace gas condenser, characterized in that: The invention comprises a tower body (1), wherein a gas inlet (2) is provided at the upper end of the tower body (1), tube sheets (3) are provided in the tower body (1) at intervals from top to bottom, a distance is provided between the tube sheet (3) located at the lower side and the bottom surface of the tower body (1), and the space formed by the distance is a condensate collecting tank (18), and vertically extending vortex heat exchange tubes (4) are distributed between the two tube sheets (3), a circulating water inlet (7) is provided on the side of the tower body (1) near the upper side of the tube sheet (3) on the lower side, and a circulating water outlet (6) is provided on the lower side of the tube sheet (3) on the upper side; baffles (5) are also provided between the upper and lower tube sheets (3) at intervals from top to bottom, a gas outlet (8) is provided on the side wall of the tower body (1), and a gap is provided between the gas outlet (8) and the bottom surface of the tower body (1), a condensate outlet is provided on the bottom surface of the tower body (1), and a liquid sealing device (10) is provided on the condensate outlet.

2. The blast furnace gas condenser according to claim 1, characterized in that: The liquid sealing device (10) comprises a U-shaped tube and a "7"-shaped tube connected to the U-shaped tube. One end of the U-shaped tube is connected to the condensate outlet via a flange, and the other end is connected to the upper end of the "7"-shaped tube. A valve (11) is provided on the transverse portion of the "7"-shaped tube.

3. The blast furnace gas condenser according to claim 1, characterized in that: A manhole (9) for maintenance is also provided on the lower side of the tower body (1).

4. A blast furnace gas condenser according to any one of claims 1 to 3, characterized in that: The vortex heat exchange tubes (4) are arranged in an equilateral triangle on the tube plate (3).

5. A blast furnace gas condensation system, characterized by: The invention comprises a first condenser (12) and a second condenser (13) arranged in series, wherein the first condenser and the second condenser are both blast furnace gas condensers according to any one of claims 1 to 4, and a wire mesh demister (17) is connected to the gas outlet (8) of the second condenser (13).

6. The blast furnace gas condensation system according to claim 5, characterized in that: There are three first condensers (12) and three second condensers (13), and the three first condensers (12) and three second condensers (13) are respectively arranged in parallel.

7. The blast furnace gas condensation system according to claim 6, characterized in that: The circulating water outlet (6) and the circulating water inlet (7) of the first condenser (12) are respectively connected to the first circulating water pipe (14), and the circulating water outlet (6) and the circulating water inlet (7) of the second condenser (13) are respectively connected to the second circulating water pipe (15). A butterfly valve (16) is provided on both the second circulating water pipe (15) and the first circulating water pipe (14). The inlet water temperature of the first circulating water pipe (14) is between 32°C and 40°C, and the inlet water temperature of the second condenser (13) is between 7°C and 12°C.

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