CN210127086U

CN210127086U - Energy-saving system in acid making start-stop process

Info

Publication number: CN210127086U
Application number: CN201920972464.7U
Authority: CN
Inventors: 刘振宇; 胡隆沈
Original assignee: Zhejiang Jiangxi Copper Smelting And Copper Co Ltd Ding Fu; Zhejiang Rich Metallurgical Group Co Ltd
Current assignee: Zhejiang Jiangxi Copper Smelting And Copper Co Ltd Ding Fu; Zhejiang Rich Metallurgical Group Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-03-06
Anticipated expiration: 2029-06-26

Abstract

The utility model provides an energy-saving system in the acid production start-stop process, which comprises a drying tower, a first absorption tower, a second absorption tower and a conversion system; the first absorption tower is connected with a first absorption tower circulating tank through a first absorption tower upper acid pipe and a first absorption tower acid return pipe, and the second absorption tower is connected with a second absorption tower circulating tank through a second absorption tower upper acid pipe and a second absorption tower acid return pipe; SO is arranged in parallel between the smoke outlet of the drying tower and the primary conversion section inlet of the conversion system₂The machine and the energy-saving special secondary fan; an acid stringing pipe is communicated between the acid feeding pipe of the first absorption tower and the acid feeding pipe of the second absorption tower, wherein a control valve is arranged on the acid stringing pipe; said oneThe bottom of the absorption tower circulating groove is communicated with the bottom of the secondary absorption tower circulating groove. The utility model discloses can stop SO when sour conversion system sweeps or goes up and down the temperature with constant temperature, stop₂The main fan starts the energy-saving secondary fan, so that the electric energy is saved; in the processes of starting and stopping the acid making system and purging at constant temperature, acid can be supplied to the first absorption tower and the second absorption tower by the first absorption tower circulating pump so as to save electric energy.

Description

Energy-saving system in acid making start-stop process

Technical Field

The utility model relates to an acid making system field, specificly relate to an energy-saving system of acid making start-stop process.

Background

The acid preparation from the flue gas is to remove SO in the flue gas₂Conversion of gas to SO₃Then absorbing and recycling, wherein during normal production, sulfur-containing flue gas enters a sulfuric acid production system for acid production, the temperature of a catalyst in a converter in the sulfuric acid production system needs to be controlled within a range of allowable working temperature of the catalyst, and the catalyst does not work when the temperature is lower than or higher than the range of allowable working temperature; the dry acid concentration of the dry absorption system needs to be maintained above 92.5 percent, the absorption acid concentration needs to be maintained above 97.5 percent, and if not, the corrosion of equipment or the influence on SO can be caused₃The absorption effect of (1).

Therefore, ⑴, before the sulfuric acid production system starts to access sulfur-containing flue gas for sulfuric acid production, the temperature of the catalyst in the sulfuric acid converter needs to be raised to meet the requirement of the working temperature, ⑵, before the sulfuric acid production system is ready to be overhauled, in order to avoid S-containing gas from being condensed after the temperature of the conversion system is reduced to form condensed acid corrosion equipment, the sulfuric acid conversion system needs to be purged at constant temperature to blow off residual SO in the conversion system₃Gas, which prevents condensed acid from corroding equipment; meanwhile, the catalyst is cooled to ensure that the temperature of each device is reduced to an adaptive temperature which can be entered by people. In the above processes of starting and stopping and constant-temperature blowing, normal production configuration is continuously adopted, so that a large amount of electric energy consumption is generated, and meanwhile, due to the fact that the capacity of related equipment is large, negative pressure at the inlet of the drying tower is too large, and a large amount of air and moisture are sucked into the system.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an energy-saving system in the acid making start-stop process.

In order to solve the technical problem, the technical scheme of the utility model is that:

section in acid making starting and stopping processThe energy system comprises a drying tower, a first absorption tower, a second absorption tower and a conversion system, wherein the conversion system at least comprises two conversion processes; the first absorption tower is connected with a first absorption tower circulating tank through a first absorption tower upper acid pipe and a first absorption tower acid return pipe, and the second absorption tower is connected with a second absorption tower circulating tank through a second absorption tower upper acid pipe and a second absorption tower acid return pipe; the smoke outlet of the drying tower passes through SO₂2, the main fan is communicated with an inlet of a primary conversion section of the conversion system; an outlet of a primary conversion section of the conversion system is communicated with a smoke inlet of a first absorption tower; the smoke outlet of the first absorption tower is communicated with the inlet of the secondary conversion section of the conversion system; an outlet of a secondary conversion section of the conversion system is communicated with a smoke inlet of the secondary absorption tower; SO is also arranged between the smoke outlet of the drying tower and the primary conversion section inlet of the conversion system₂The main fan is connected with the energy-saving secondary fan in parallel; an acid stringing pipe is communicated between the acid feeding pipe of the first absorption tower and the acid feeding pipe of the second absorption tower, wherein a control valve is arranged on the acid stringing pipe; and the bottom of the first absorption tower circulating groove is communicated with the bottom of the second absorption tower circulating groove.

Preferably, the bottom of the first-suction-tower circulation tank and the bottom of the second-suction-tower circulation tank are communicated through a communicating pipe.

Compare prior art, the utility model has the advantages that:

1 by additionally arranging the secondary fan, the acid making system can start and stop the acid making system and perform constant-temperature purging process, the secondary fan is started, and the high-power SO is closed₂Main blower, i.e. avoiding high-power SO₂The use of the main fan reduces the power consumption of the fan, and simultaneously avoids overlarge negative pressure at the inlet of the drying tower due to overlarge air quantity of the fan, so that overlarge air (containing certain moisture) is sucked, and the control of the circulating acid concentration of the drying tower is facilitated.

2, in the processes of starting and stopping the acid making system and purging at constant temperature, acid can be supplied to the first absorption tower and the second absorption tower by the first absorption tower circulating pump, so that the starting of the second absorption tower circulating pump and the second absorption circulating water pump can be avoided, and the power consumption of the two pumps is saved; meanwhile, due to the reduction of the external circulating water amount, the heat carry-over of the external circulating water is reduced, and the purpose of reducing the heat loss of the whole system is achieved. Because the heat of the whole system is supplied by the electric furnace of the conversion system in the processes of starting and stopping the acid making system and purging at constant temperature, the heat loss of the system is reduced by the local part, and the power consumption of the conversion heating electric furnace is saved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Reference numerals: 1. a drying tower; 11. a drying circulation tank; 2. a first absorption tower; 21. an acid feeding pipe on the first absorption tower; 22 an absorption tower acid return pipe; 23. a first absorption tower circulation tank; 3. a second absorption tower; 31. an acid pipe is arranged on the second absorption tower; 32. a second absorption tower acid return pipe; 33. a second absorption tower circulation tank; 4. a conversion system; 5. SO (SO)₂A main fan; 6. a secondary air blower; 7. stringing acid pipes; 71. a control valve; 8. a communication pipe is provided.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.

Example (b):

referring to fig. 1, the embodiment provides an energy saving system in the acid production start-stop process, including a drying tower 1, a first absorption tower 2, a second absorption tower 3, and a conversion system 4, where the conversion system 4 includes at least two conversion processes; the existing conversion system 4 mainly comprises a heat exchanger, a converter, a heating electric furnace, a heat pipe waste heat boiler and the like.

The first absorption tower 2 is connected with a first absorption tower circulation tank 23 through a first absorption tower acid feeding pipe 21 and a first absorption tower acid returning pipe 22, and a first absorption tower circulation pump (not shown) is generally arranged on the first absorption tower acid feeding pipe 21 and is used for driving acid liquor to circularly flow between the first absorption tower 2 and the first absorption tower circulation tank 23. The second absorption tower 3 is connected with a second absorption tower circulating tank 33 through a second absorption tower upper acid pipe 31 and a second absorption tower acid return pipe 32, and a second absorption tower circulating pump (not shown in the figure) is also arranged on the second absorption tower upper acid pipe 31.

The drying tower 1 is also connected with a drying circulating groove 11, and the smoke outlet of the drying tower 1 passes through SO₂The main fan 5 is communicated with an inlet of a primary conversion section of the conversion system 4; the primary conversion section outlet of the conversion system 4 and the smoke inlet of the absorption tower 2The ports are communicated; the smoke outlet of the absorption tower 2 is communicated with the inlet of the secondary conversion section of the conversion system 4; and the outlet of the secondary conversion section of the conversion system 4 is communicated with the smoke inlet of the secondary absorption tower 3.

An energy-saving secondary fan 6 is also arranged between the smoke outlet of the drying tower 1 and the primary conversion section inlet of the conversion system 4, wherein the secondary fan 6 and the main fan 5 are in a parallel structure; an acid stringing pipe 7 is communicated between the first absorption tower upper acid pipe 21 and the second absorption tower upper acid pipe 31, wherein a control valve 71 is arranged on the acid stringing pipe 7; the bottoms of the first absorption tower circulation tank 23 and the second absorption tower circulation tank 33 are communicated, wherein the bottoms of the first absorption tower circulation tank 23 and the second absorption tower circulation tank 33 are communicated through a communicating pipe 8.

The implementation principle is as follows:

when the acid making system is in the starting and stopping and constant-temperature purging stages, the main fan 5 is closed, the secondary fan 6 is opened, the circulating pump of the second absorption tower and the corresponding cooling water circulating pump are stopped at the same time, the outlet valve of the second absorption circulating pump is closed, and the control valve 71 on the acid serial pipe 7 is opened, so that the first absorption tower and the second absorption tower can be supplied with acid only by the circulating pump of the first absorption tower 2. Therefore, the use of the main fan 5 (with larger power) is avoided, the power consumption of the fan is reduced, and the phenomenon that the air quantity of the fan is too large to cause too large negative pressure at the inlet of the drying tower 1 and bring too large air (containing certain moisture) suction is avoided, so that the control of the circulating acid concentration of the drying tower 1 is facilitated.

Because the first absorption tower circulation tank 23 and the second absorption tower circulation tank 33 are communicated, the first absorption tower circulation pump can pump acid liquor to be pumped into the first absorption tower 2 through the first absorption tower acid feeding pipe 21 for acid supply, and to be pumped into the second absorption tower 3 through the acid stringing pipe 7 for acid supply, and finally to be reflowed into the first absorption tower circulation tank 23 and the second absorption tower circulation tank 33 from the bottoms of the first absorption tower 2 and the second absorption tower 3. Therefore, in the process, only the first absorption tower circulating pump can supply acid to the first absorption tower 2 and the second absorption tower 3 at the same time, so that the second absorption tower circulating pump and the second absorption circulating water pump can be prevented from being started, and the electric energy consumption of the two pumps is saved; meanwhile, due to the reduction of the external circulating water amount, the heat carry-over of the external circulating water is reduced, and the purpose of reducing the heat loss of the whole system is achieved. Because the heat of the whole system is supplied by the electric furnace of the conversion system 4 in the processes of starting and stopping the acid making system and purging at constant temperature, the heat loss of the system is reduced by the part, and the power consumption of the conversion heating electric furnace is saved.

The above embodiment is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the technical scope of the claims.

Claims

1. An energy-saving system in the acid production start-stop process comprises a drying tower, a first absorption tower, a second absorption tower and a conversion system, wherein the conversion system at least comprises two conversion processes; the first absorption tower is connected with a first absorption tower circulating tank through a first absorption tower upper acid pipe and a first absorption tower acid return pipe, and the second absorption tower is connected with a second absorption tower circulating tank through a second absorption tower upper acid pipe and a second absorption tower acid return pipe; the smoke outlet of the drying tower passes through SO₂The fan is communicated with an inlet of a primary conversion section of the conversion system; an outlet of a primary conversion section of the conversion system is communicated with a smoke inlet of a first absorption tower; the smoke outlet of the first absorption tower is communicated with the inlet of the secondary conversion section of the conversion system; an outlet of a secondary conversion section of the conversion system is communicated with a smoke inlet of the secondary absorption tower; the method is characterized in that: SO is also arranged between the smoke outlet of the drying tower and the primary conversion section inlet of the conversion system₂The main fan is connected with the energy-saving secondary fan in parallel; an acid stringing pipe is communicated between the acid feeding pipe of the first absorption tower and the acid feeding pipe of the second absorption tower, wherein a control valve is arranged on the acid stringing pipe; and the bottom of the first absorption tower circulating groove is communicated with the bottom of the second absorption tower circulating groove.

2. The energy saving system in the process of acid making start-up and shutdown according to claim 1, characterized in that: and the bottoms of the first-suction tower circulating tank and the second-suction tower circulating tank are communicated through a communicating pipe.