Treatment device for waste dilute sulphuric acid of coking plant

Abstract

The utility model relates to the field of waste dilute sulphuric acid treatment, in particular to a treatment device for waste dilute sulphuric acid in a coking plant. The treatment device comprises: a dilute acid storage tank for storing waste dilute sulfuric acid; a first spraying assembly communicated with the dilute acid storage tank and a circulating spraying assembly capable of circularly spraying liquid in the pickling tower are arranged in the pickling tower; the pickling tower is provided with a tail gas inlet, a tail gas outlet and a first acid adding port; the tail gas inlet conveys regenerated tail gas into the pickling tower, and the first spraying assembly sprays waste dilute sulphuric acid to the regenerated tail gas so as to remove ammonia gas in the regenerated tail gas; the tail gas outlet is used for discharging the regenerated tail gas without ammonia gas out of the pickling tower, and concentrated sulfuric acid can be supplemented into the pickling tower through the first acid adding port. The treatment device for the waste dilute sulphuric acid in the coking plant can absorb ammonia gas in regenerated tail gas by using the waste dilute sulphuric acid to produce an ammonium sulfate product, so that the treatment problem of the waste dilute sulphuric acid is solved, and reasonable resource utilization of the waste dilute sulphuric acid is realized.

Description

Technical Field

[0001] The utility model relates to the field of waste dilute sulfuric acid treatment, in particular to a treatment device for waste dilute sulfuric acid in a coking plant. Background Art

[0002] At present, the HPF (quinone cobalt iron composite catalyst composed of hydroquinone, binuclear titanium cobalt cyanosulfonate and ferrous sulfate) desulfurization process is a wet oxidation desulfurization process widely used in my country, with independent intellectual property rights. It is characterized by high desulfurization efficiency, wider operating requirements than absorption and desorption methods, and no special equipment and material requirements. After two-stage desulfurization, the H2S content of coal gas is ≤100mg / m3, and even as low as 50mg / m3 or less. In recent years, the development and application of desulfurization waste liquid and sulfur paste acid production technology have made this process more perfect.

[0003] The desulfurized liquid and sulfur particles produced by the HPF desulfurization of coke oven gas are sent to the desulfurized liquid acid-making unit for concentration and incineration to produce concentrated sulfuric acid for the acid supplementation of the ammonium sulfate unit in the coking plant. During the acid production process, a large amount of dilute sulfuric acid waste liquid with a concentration of less than 1% will be produced. This part of the waste liquid is usually discharged from the system in the form of wastewater. If it is not properly treated, it will have an adverse effect on the normal production of the acid-making unit; at the same time, the acid-containing wastewater enters the sewage treatment, and a certain amount of liquid alkali is required for neutralization, which increases the sewage operation cost and cannot realize the resource utilization of waste acid. In addition, a large amount of regenerated tail gas will be generated during the HPF desulfurization of coke oven gas. This part of the regenerated tail gas is usually released on-site in the high tower. Since the regenerated tail gas contains 2000-5000mg / m 3 The regeneration exhaust gas has a strong odor and has a great impact on the surrounding environment.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to improve or solve the technical problem that waste dilute sulfuric acid is difficult to reasonably utilize in the prior art, the utility model provides a treatment device for waste dilute sulfuric acid in a coking plant. The treatment device includes: a dilute acid storage tank for storing waste dilute sulfuric acid; a pickling tower, in which a first spray assembly connected to the dilute acid storage tank and a circulating spray assembly that can circulate and spray the liquid in the pickling tower are arranged; the pickling tower has a tail gas inlet located at the bottom of the pickling tower, a tail gas outlet located at the top of the pickling tower, and a first acid addition port; the tail gas inlet is suitable for conveying regeneration tail gas containing ammonia into the pickling tower, and the first spray assembly is configured to spray the waste dilute sulfuric acid into the regeneration tail gas to remove ammonia from the regeneration tail gas; the tail gas outlet is suitable for discharging the regeneration tail gas after the ammonia is removed from the pickling tower, and the first acid addition port is configured to replenish concentrated sulfuric acid into the pickling tower.

[0006] In the treatment device of waste dilute sulfuric acid in a coking plant, the utility model includes a dilute acid storage tank and a pickling tower. The dilute acid storage tank is used to store waste dilute sulfuric acid. A first spray assembly is arranged in the pickling tower and has a tail gas inlet and a tail gas outlet; the regeneration tail gas containing nitrogen enters the pickling tower through the tail gas inlet, and the waste dilute sulfuric acid enters the pickling tower through the first spray assembly and sprays to the regeneration tail gas, dissolving most of the ammonia in the regeneration tail gas in the waste dilute sulfuric acid to form a pickling liquid; the regeneration tail gas washed with the waste dilute sulfuric acid is discharged from the pickling tower from the tail gas outlet. The circulating spray assembly is arranged in the pickling tower, and the first acid addition port is connected to the inside of the pickling tower, which is used to add concentrated sulfuric acid to the pickling tower to ensure that the pH value and acid concentration of the pickling liquid in the pickling tower meet the requirements, thereby obtaining a better washing effect. Through the above-mentioned arrangement, the device for treating waste dilute sulfuric acid in a coking plant can utilize waste dilute sulfuric acid to absorb ammonia in the regenerated tail gas to produce ammonium sulfate products, thereby solving the problem of treating waste dilute sulfuric acid and realizing the rational utilization of waste dilute sulfuric acid resources.

[0007] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, the circulating spray assembly is connected to a circulating pipeline, and one end of the circulating pipeline away from the circulating spray assembly is connected to the pickling tower and is located at the bottom of the pickling tower. Through the above-mentioned arrangement, the circulating spray assembly can circulate the pickling liquid in the pickling tower.

[0008] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, a pH meter is arranged in the pickling tower, and the pH meter is located at the bottom of the pickling tower. Through the above-mentioned arrangement, the arrangement of the pH meter can more conveniently observe the pH value of the pickling liquid in the pickling tower, thereby determining the timing of adding concentrated sulfuric acid.

[0009] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, the material of the pickling tower is high-temperature corrosion-resistant fiberglass. Through the above-mentioned setting, the high-temperature corrosion-resistant fiberglass has high strength and corrosion resistance, can withstand the pressure, load and corrosion during the pickling process, and ensure the stability and safety of the equipment.

[0010] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, a saturator is also included, and the saturator is connected to the pickling tower through a flushing pipe, and the end of the flushing pipe away from the pickling tower is located at the bottom of the pickling tower. Through the above-mentioned arrangement, the saturator can make the ammonia dissolved in the pickling liquid fully react with the dilute sulfuric acid to generate sulfate, and effectively remove the ammonia in the pickling liquid.

[0011] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, the saturator is connected to a full flow tank via a full flow pipe, and one end of the full flow pipe away from the full flow tank is located in the middle of the saturator. Through the above-mentioned arrangement, the full flow pipe and the full flow tank are used to control the page height of the mother liquor in the saturator; at the same time, the overflow tank can also store the mother liquor.

[0012] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, the full flow pipe is connected to a second acid adding pipe, and the second acid adding pipe is configured to replenish concentrated sulfuric acid into the full flow tank. Through the above-mentioned setting, the second acid adding pipe is used to adjust the acid concentration of the mother liquor in the full flow tank.

[0013] In the preferred technical solution of the above-mentioned device for treating waste dilute sulfuric acid in a coking plant, the flushing pipe is connected to a steam pipe, and the steam pipe is configured to adjust the temperature of the mother liquor in the saturator. Through the above-mentioned arrangement, the steam pipe is used to adjust the temperature of the mother liquor in the saturator, thereby facilitating a full reaction between ammonia and acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0015] Figure 1 It is a schematic diagram of an embodiment of the utility model for a device for treating waste dilute sulfuric acid in a coking plant.

[0016] List of reference numerals: 1. dilute acid storage tank; 11. dilute acid pipeline; 12. dilute acid pump; 2. pickling tower; 21. first spray assembly; 22. circulating spray assembly; 23. circulating pipeline; 231. circulating pump; 24. tail gas inlet pipeline; 25. tail gas outlet pipeline; 26. first acid adding pipeline; 27. pH meter; 3. saturator; 31. flushing pipe; 311. external discharge pump; 32. steam pipe; 33. full flow pipe; 34. full flow tank; 35. second acid adding pipeline. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0018] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In order to improve or solve the technical problem that waste dilute sulfuric acid is difficult to reasonably utilize in the prior art, the utility model provides a treatment device for waste dilute sulfuric acid in a coking plant. The treatment device comprises: a dilute acid storage tank 1 for storing waste dilute sulfuric acid; a pickling tower 2, in which a first spray assembly 21 connected to the dilute acid storage tank 1 and a circulating spray assembly 22 for circulating and spraying the liquid in the pickling tower 2 are arranged; the pickling tower 2 has a tail gas inlet located at the bottom of the pickling tower 2, a tail gas outlet located at the top of the pickling tower 2, and a first acid addition port; the tail gas inlet is suitable for conveying regeneration tail gas containing ammonia into the pickling tower 2, and the first spray assembly 21 is configured to spray waste dilute sulfuric acid to the regeneration tail gas to remove ammonia in the regeneration tail gas; the tail gas outlet is suitable for discharging the regeneration tail gas after the ammonia is removed from the pickling tower 2, and the first acid addition port is configured to replenish concentrated sulfuric acid into the pickling tower 2.

[0021] Figure 1 This is a schematic diagram of an embodiment of the utility model for treating waste dilute sulfuric acid in a coking plant. Figure 1 As shown, in one or more embodiments, the device for treating waste dilute sulfuric acid from a coking plant of the utility model comprises a dilute acid storage tank 1 , a pickling tower 2 and a saturator 3 .

[0022] Continue to see Figure 1 In one or more embodiments, a dilute acid pipeline 11 is provided on the acid storage tank, and the waste dilute sulfuric acid flows into the acid storage tank through the dilute acid pipeline 11. Preferably, one end of the dilute acid pipeline 11 is located at the top of the acid storage tank. Further, an outflow pipeline is provided at the bottom of the acid storage tank, and a dilute acid pump 12 is provided on the outflow pipeline.

[0023] Continue to see Figure 1In one or more embodiments, a first spray assembly 21 is arranged in the pickling tower 2, and the first spray assembly 21 is close to the top of the pickling tower 2 and connected to the outflow pipe. Waste dilute sulfuric acid is transported to the first spray assembly 21 through the outflow pipe, and sprayed into the pickling tower 2 by the first spray assembly 21. Preferably, the first spray assembly 21 includes a plurality of spray heads arranged side by side. Further, a circulating spray assembly 22 is arranged in the pickling tower 2. Specifically, the circulating spray assembly 22 is connected to a circulating pipe 23, and one end of the circulating pipe 23 away from the circulating spray assembly 22 is connected to the pickling tower 2 and is located at the bottom of the pickling tower 2. A circulating pump 231 is provided on the circulating pipe 23. Through the circulating pump 231, the liquid at the bottom of the pickling tower 2 can be transported to the circulating spray assembly 22. Further, the circulating spray assembly 22 is located below the first spray assembly 21, and has the same structure as the first spray assembly 21.

[0024] Continue to see Figure 1 In one or more embodiments, the pickling tower 2 has a tail gas inlet and a tail gas outlet. The tail gas inlet is located at the bottom of the pickling tower 2, and the tail gas outlet is located at the top of the pickling tower 2. Specifically, a tail gas inlet pipe 24 is provided at the tail gas inlet, and a tail gas outlet pipe 25 is arranged at the tail gas outlet. The regenerated tail gas containing ammonia is transported to the pickling tower 2 through the tail gas inlet, and the ammonia in the regenerated tail gas is removed under the spraying of the first spray component 21 and the circulating spray component 22. Finally, the regenerated tail gas after the ammonia is removed is discharged from the pickling tower 2 through the tail gas outlet. The regenerated tail gas without ammonia removal contains 2000-5000 mg / m3 of ammonia, and the regenerated tail gas after the ammonia removal contains ≤50 mg / m3 of ammonia.

[0025] Continue to see Figure 1 In one or more embodiments, the pickling tower 2 has a first acid addition port, and the first acid addition port is provided with a first acid addition pipeline 26. Concentrated sulfuric acid is transported to the pickling tower 2 through the first acid addition pipeline 26 and the first acid addition port to maintain the pH and acid concentration of the pickling solution in the pickling tower 2. Preferably, the pH value of the pickling solution in the pickling tower 2 is ≤1, and the acid concentration is 3%-5%. Further, a pH meter 27 is arranged in the pickling tower 2, and the pH meter 27 is located at the bottom of the pickling tower 2, so as to monitor the pH value of the pickling solution in the pickling tower 2 online. Further, the material of the pickling tower 2 is high-temperature corrosion-resistant fiberglass.

[0026] Continue to see Figure 1In one or more embodiments, the saturator 3 is connected to the pickling tower 2 through a flushing pipe 31, and the end of the flushing pipe 31 away from the pickling tower 2 is located at the bottom of the pickling tower 2. The pickling liquid in the pickling tower 2 forms a mother liquor after entering the saturator 3. An efflux pump 311 is arranged on the flushing pipe 31. The pickling liquid in the pickling tower 2 can be transported to the saturator 3 through the efflux pump 311. Preferably, the efflux pump 311 is turned on regularly to transport the pickling liquid to the saturator 3. Further, the flushing pipe 31 is connected to a steam pipe 32, and the steam pipe 32 can adjust the temperature of the mother liquor in the saturator 3. Preferably, the temperature of the steam pipe 32 is between 60-90°C. Further, the saturator 3 is connected to a full flow tank 34 through a full flow pipe 33, and a section of the full flow pipe 33 away from the full flow tank 34 is located in the middle of the saturator 3. Furthermore, the full flow pipe 33 is connected to a second acid adding pipe 35, and the second acid adding pipe 35 can add concentrated sulfuric acid into the full flow tank 34 to control the acid concentration of the mother liquor. Preferably, the acid concentration of the mother liquor is controlled at 3%-5%.

[0027] So far, the technical scheme of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical schemes after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A device for treating waste dilute sulfuric acid from a coking plant, characterized in that: include: A dilute acid storage tank (1) for storing waste dilute sulfuric acid; A pickling tower (2), wherein a first spray assembly (21) connected to the dilute acid storage tank (1) and a circulating spray assembly (22) capable of circulating and spraying the liquid in the pickling tower (2) are arranged in the pickling tower (2); the pickling tower (2) has an exhaust gas inlet located at the bottom of the pickling tower (2), an exhaust gas outlet located at the top of the pickling tower (2), and a first acid addition port; the exhaust gas inlet is suitable for conveying regenerated exhaust gas containing ammonia into the pickling tower (2), and the first spray assembly (21) is configured to spray the waste dilute sulfuric acid onto the regenerated exhaust gas to remove ammonia from the regenerated exhaust gas; the exhaust gas outlet is suitable for discharging the regenerated exhaust gas after the ammonia is removed from the pickling tower (2), and the first acid addition port is configured to replenish concentrated sulfuric acid into the pickling tower (2).

2. The device for treating waste dilute sulfuric acid from a coking plant according to claim 1, characterized in that: The circulating spray assembly (22) is connected to a circulating pipe (23), and one end of the circulating pipe (23) away from the circulating spray assembly (22) is connected to the pickling tower (2) and is located at the bottom of the pickling tower (2).

3. The device for treating waste dilute sulfuric acid from a coking plant according to claim 1, characterized in that: A pH meter (27) is arranged in the pickling tower (2), and the pH meter (27) is located at the bottom of the pickling tower (2).

4. The device for treating waste dilute sulfuric acid from a coking plant according to claim 1, characterized in that: The pickling tower (2) is made of high-temperature corrosion-resistant glass fiber reinforced plastic.

5. The device for treating waste dilute sulfuric acid from a coking plant according to claim 1, characterized in that: It also includes a saturator (3), which is connected to the pickling tower (2) through a flushing pipe (31), and one end of the flushing pipe (31) away from the pickling tower (2) is located at the bottom of the pickling tower (2).

6. The device for treating waste dilute sulfuric acid from a coking plant according to claim 5, characterized in that: The saturator (3) is connected to a full flow tank (34) via a full flow pipe (33), and one end of the full flow pipe (33) away from the full flow tank (34) is located in the middle of the saturator (3).

7. The device for treating waste dilute sulfuric acid from a coking plant according to claim 6, characterized in that: The full flow pipe (33) is connected to a second acid adding pipe (35), and the second acid adding pipe (35) is configured to replenish concentrated sulfuric acid into the full flow tank (34).

8. The device for treating waste dilute sulfuric acid from a coking plant according to claim 5, characterized in that: The flushing pipe (31) is connected to a steam pipe (32), and the steam pipe (32) is configured to adjust the temperature of the mother liquid in the saturator (3).

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