HRS system heat energy recovery device capable of improving steam yield

Abstract

The utility model relates to the technical field of heat energy recovery, in particular to an HRS system heat energy recovery device capable of improving the steam yield. One outlet of the HRS tower is connected with an HRS steam generator through a circulating pump, one outlet of the HRS steam generator is connected with an inlet of an HRS diluter, an outlet of the HRS diluter is connected with the HRS tower, and the other outlet of the HRS steam generator is divided into two paths which are respectively connected with a medium inlet of an HRS heater and a medium inlet of a deoxidizing steam generator; medium outlets of the HRS heater and the deoxidizing steam generator are combined and then jointly connected with a medium inlet of the desalted water preheater, a medium outlet of the desalted water preheater is connected with a first acid pipeline, and a first branch pipeline is arranged between pipelines of the medium inlet and the medium outlet of the deoxidizing steam generator. And a first high-position control valve is arranged on the first branch pipeline. Compared with the prior art, heat energy in the acid making process is utilized, and the yield of low-pressure steam is increased under the action of the HRS steam generator and the deoxidizing steam generator.

Description

Technical Field

[0001] This utility model relates to the field of heat energy recovery technology, specifically a heat energy recovery device for an HRS system to increase steam production. Background Technology

[0002] Currently, heat recovery efficiency is highly valued in sulfuric acid production from smelting flue gas, pyrite, and sulfur. The heat energy sources for steam generation in these sulfuric acid production units mainly fall into three categories: 1. Heat energy from sulfur combustion; 2. Heat of conversion during the SO2 to SO3 conversion process; 3. The establishment of a low-temperature heat recovery system (HRS) for saturated steam to recover heat from the sulfuric acid production process. However, current heat recovery devices produce relatively little steam, which cannot meet actual demand. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of existing technologies by providing a heat recovery device for an HRS system that increases steam production.

[0004] To achieve the above objectives, a heat recovery device for an HRS system to increase steam production is designed, comprising an HRS tower. One outlet of the HRS tower is connected to an HRS steam generator via a circulating pump. One outlet of the HRS steam generator is connected to the inlet of an HRS diluent. The outlet of the HRS diluent is connected to the HRS tower. The other outlet of the HRS steam generator is split into two paths, which are respectively connected to the media inlet of an HRS heater and a deoxygenated steam generator. The media outlets of the HRS heater and the deoxygenated steam generator are combined and connected to the media inlet of a demineralized water preheater. The media outlet of the demineralized water preheater is connected to a first acid pipeline. A first branch pipeline is provided between the media inlet and media outlet pipelines of the deoxygenated steam generator, and a first high-level control valve is provided on the first branch pipeline.

[0005] One outlet of the HRS tower is connected to a third acid pipeline via an HRS acid discharge pump.

[0006] The inlet of the HRS diluter is connected to the second acid pipeline. The external demineralized water is connected to the demineralized water pump, demineralized water preheater, deoxygenated steam generator, and feed water pump in sequence through pipelines and then connected to the inlet of the HRS diluter. The heated acid and the treated external demineralized water are mixed in the HRS diluter and then enter the HRS tower.

[0007] The external demineralized water is connected in sequence through pipelines to the demineralized water pump, demineralized water preheater, deaerator steam generator, feed water pump, HRS heater, and then connected to the inlet of the HRS steam generator.

[0008] The HRS heater has a second branch pipe between the medium inlet and medium outlet pipes, and a temperature control valve is installed on the second branch pipe. A temperature detection point that cooperates with the temperature control valve is installed on the connecting pipe between the HRS heater and the HRS steam generator.

[0009] The steam outlet of the HRS steam generator is divided into two paths: one path is connected to the low-pressure steam manifold, and the other path is connected to the outlet pipeline of the deaerator steam generator. Both paths are connected to the HRS tower through a steam ejector.

[0010] A third branch pipe is provided between the medium inlet and medium outlet pipes of the demineralized water preheater, and a second high-level control valve is provided on the third branch pipe.

[0011] A liquid level control valve is installed on the connecting pipeline between the demineralized water preheater and the deoxygenated steam generator, and a liquid level control point is installed in the deoxygenated steam generator to cooperate with the liquid level control valve.

[0012] The connecting pipeline between the HRS steam generator, the deaerator steam generator and the steam ejector is equipped with a pressure monitoring point and a pressure control valve that cooperates with the pressure monitoring point.

[0013] An acid concentration meter is installed on the first acid pipeline.

[0014] Compared with the prior art, this utility model utilizes the heat energy in the acid production process and increases the output of low-pressure steam through the action of HRS steam generator and deaeration steam generator. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pipeline of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, one outlet of HRS tower 1 is connected to HRS steam generator 3 via circulating pump 2. One outlet of HRS steam generator 3 is connected to the inlet of HRS diluter 4. The outlet of HRS diluter 4 is connected to HRS tower 1. The other outlet of HRS steam generator 3 is split into two paths, which are respectively connected to the media inlet of HRS heater 5 and deoxygenated steam generator 6. The media outlets of HRS heater 5 and deoxygenated steam generator 6 are combined and connected to the media inlet of demineralized water preheater 7. The media outlet of demineralized water preheater 7 is connected to the first acid pipeline 11. The steam outlet of HRS steam generator 3 is split into two paths, one of which is connected to low-pressure steam manifold 10, and the other is connected to the outlet pipeline of deoxygenated steam generator 6. Both paths are connected to HRS tower 1 via steam ejector 9.

[0018] One outlet of HRS tower 1 is connected to a third acid pipeline 13 via HRS acid discharge pump 8, which merges with the existing acid system.

[0019] The inlet of HRS diluter 4 is connected to the second acid pipeline 12. External demineralized water 14 is connected sequentially through pipelines to the demineralized water pump 15, demineralized water preheater 7, deoxygenated steam generator 6, and feed water pump 16 before being connected to the inlet of HRS diluter 4. The heated acid and treated external demineralized water 14 are mixed in HRS diluter 4 and then enter HRS tower 1. The addition of water and acid generates heat through SO3 absorption, raising the temperature of the circulating acid and providing more heat to the HRS heater 5 and deoxygenated steam generator 6, thereby increasing the low-pressure steam production.

[0020] The external demineralized water 14 is connected in sequence through pipes to the demineralized water pump 15, the demineralized water preheater 7, the deaeration steam generator 6, the feed water pump 16, and the HRS heater 5, and then connected to the inlet of the HRS steam generator 3.

[0021] A second branch pipe 19 is provided between the medium inlet and medium outlet pipes of the HRS heater 5. A temperature control valve 20 is provided on the second branch pipe 19. A temperature detection point 21 that cooperates with the temperature control valve 20 is provided on the connecting pipe between the HRS heater 5 and the HRS steam generator 3.

[0022] A first branch pipe 17 is provided between the medium inlet and medium outlet pipes of the deaerator steam generator 6. A first high-level control valve 18 is provided on the first branch pipe 17 to control the inlet medium flow rate of the deaerator steam generator 6. The first branch pipe works simultaneously with the deaerator steam generator to control the medium volume in the pipe where the pressure control valve 26 is located. Adjustments are made according to the requirements of the device during specific use.

[0023] A third branch pipe 23 is provided between the medium inlet and medium outlet pipes of the demineralized water preheater 7. A second high-level control valve 22 is provided on the third branch pipe 23 to control the inlet medium flow rate of the demineralized water preheater 7, thereby controlling the medium temperature in the pipe where the liquid level control valve 24 is located. In specific use, adjustments are made according to the requirements of the device.

[0024] A liquid level control valve 24 is provided on the connecting pipeline between the demineralized water preheater 7 and the deoxygenated steam generator 6, and a liquid level control point 25 is provided in the deoxygenated steam generator 6 to cooperate with the liquid level control valve 24.

[0025] A pressure monitoring point 26 and a pressure control valve 27 that cooperate with the pressure monitoring point 26 are provided on the connecting pipeline between the HRS steam generator 3, the deaerator steam generator 6 and the steam ejector 9.

[0026] An acid concentration meter 28 is installed on the first acid pipeline 11.

[0027] In use, the acid is pumped from the HRS acid circulation pump 2 on the HRS tower 1 pump tank to the HRS steam generator 3. After leaving the HRS steam generator 3, the acid is divided into two streams. Most of the cooled acid flows through the HRS diluter 4 and then returns to the HRS tower 1 for circulation. A small portion, which will be used as product acid, is further divided into two parts. One part passes through the HRS heater 5, and the other part enters the deoxygenated steam generator 6, which respectively serve as heat source media to provide heat to the water vapor entering the HRS heater 5 and the deoxygenated steam generator 6. The acid flowing out of the HRS heater 5 and the deoxygenated steam generator 6 is mixed and then enters the demineralized water preheater 7 to provide heat again. Finally, it flows into the dry acid absorption system through the first acid channel 11.

[0028] After the external demineralized water 14 enters the deoxygenated steam generator 6, it exchanges heat with the high-temperature acid, and part of the demineralized water generates low-pressure steam. This steam combines with the steam separated from the HRS steam generator 3, and then, after pressure reduction, is sent into the flue gas system of HRS tower 1 to maintain the required water volume for HRS acid concentration and transfer heat energy to the high-temperature circulating acid system to generate more saturated low-pressure steam. The remaining demineralized water is deoxygenated by the deoxygenation function of the deoxygenated steam generator 6. Part of it enters the HRS heater 5 to exchange heat with the high-temperature acid and then enters the HRS steam generator 3 to generate high-pressure steam. Another part of the demineralized water enters the HRS diluent 4 and mixes with sulfuric acid in the second acid pipeline 12 to control the acid concentration to above 99.0%. This part of the acid is then recycled to HRS tower 1. The added dilution water and sulfuric acid absorb SO3 in HRS tower 1, generating heat of generation, which raises the temperature of the circulating acid, ensuring that the acid temperature exiting HRS tower 1 is sufficient.

[0029] In practical use, the deaerator steam generator 6 produces steam through heating. During steam generation, some oxygen escapes due to the increased temperature, thus providing a certain degree of deaeration. Furthermore, it prioritizes steam production efficiency, with deaeration as an auxiliary function, aiming to maximize steam output.

Claims

1. A HRS system heat recovery unit for increasing steam production, comprising a HRS column, characterized in that: One outlet of the HRS tower (1) is connected to the HRS steam generator (3) via a circulating pump (2). One outlet of the HRS steam generator (3) is connected to the inlet of the HRS diluent (4). The outlet of the HRS diluent (4) is connected to the HRS tower (1). The other outlet of the HRS steam generator (3) is split into two paths, which are respectively connected to the medium inlet of the HRS heater (5) and the deoxygenated steam generator (6). The medium outlets of the HRS heater (5) and the deoxygenated steam generator (6) are combined and connected to the medium inlet of the demineralized water preheater (7). The medium outlet of the demineralized water preheater (7) is connected to the first acid pipeline (11). A first branch pipeline (17) is provided between the medium inlet and medium outlet pipelines of the deoxygenated steam generator (6). A first high-level control valve (18) is provided on the first branch pipeline (17).

2. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: One outlet of the HRS tower (1) is connected to a third acid pipeline (13) via an HRS acid discharge pump (8).

3. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: The inlet of the HRS diluter (4) is connected to the second acid pipeline (12). The external demineralized water (14) is connected to the demineralized water pump (15), demineralized water preheater (7), deoxygenated steam generator (6), and feed water pump (16) in sequence through pipelines and then connected to the inlet of the HRS diluter (4). The heated acid and the treated external demineralized water (14) are mixed in the HRS diluter (4) and then enter the HRS tower (1).

4. The HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: The external demineralized water (14) is connected in sequence to the demineralized water pump (15), the demineralized water preheater (7), the deoxygenated steam generator (6), the feed water pump (16), and the HRS heater (5) through pipelines, and then connected to the inlet of the HRS steam generator (3).

5. A HRS system heat recovery device for increasing steam production according to claim 1 or 4, characterized in that: A second branch pipe (19) is provided between the medium inlet and medium outlet pipes of the HRS heater (5). A temperature control valve (20) is provided on the second branch pipe (19). A temperature detection point (21) is provided on the connecting pipe between the HRS heater (5) and the HRS steam generator (3) in conjunction with the temperature control valve (20).

6. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: The steam outlet of the HRS steam generator (3) is divided into two paths. One path is connected to the low-pressure steam manifold (10), and the other path is connected to the outlet pipeline of the deaerator steam generator (6). Both paths are connected to the HRS tower (1) through the steam ejector (9).

7. A heat recovery device for an HRS system to increase steam production according to claim 1, characterized in that: The demineralized water preheater (7) is provided with a third branch pipe (23) between the medium inlet and medium outlet pipes, and a second high-level control valve (22) is provided on the third branch pipe (23).

8. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: A liquid level control valve (24) is provided on the connecting pipeline between the demineralized water preheater (7) and the deoxygenated steam generator (6), and a liquid level control point (25) is provided in the deoxygenated steam generator (6) in coordination with the liquid level control valve (24).

9. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: The connecting pipeline between the HRS steam generator (3), the deaerator steam generator (6) and the steam ejector (9) is equipped with a pressure monitoring point (27) and a pressure control valve (26) that cooperates with the pressure monitoring point (27).

10. A HRS system heat recovery device for increasing steam production according to claim 1, characterized in that: An acid concentration meter (28) is provided on the first acid pipeline (11).

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