Flue gas self-heat-exchange sulfuric acid low-pressure steam production efficiency optimization system

Abstract

The utility model discloses a flue gas self-heat-exchange sulfuric acid low-pressure steam production efficiency optimization system, which relates to the technical field of flue gas self-heat-exchange and steam production efficiency optimization, and comprises a first heat exchanger, a battery acid device, a second heat exchanger, a fuming sulfuric acid device and a converter, a gas return pipe of the battery acid device is connected into a gas inlet of the first heat exchanger, a converter is further connected into the gas inlet of the first heat exchanger, a gas return pipeline of the first heat exchanger is further connected with the second heat exchanger, and a gas inlet of the second heat exchanger is connected with the fuming sulfuric acid device. According to the low-pressure waste heat steam production system, the heat exchange between steam and gas is enhanced by additionally arranging a plurality of heat exchangers, the gas inlet temperature of the low-pressure waste heat steam production system can be regulated and controlled, the utilization rate of waste heat is increased, and the productivity of low-pressure steam is improved by utilizing self heat exchange of flue gas of each hrs tower; and the smoke heat energy is transferred to the low-pressure waste heat steam generating device, so that the productivity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas self-heat exchange and steam production efficiency optimization, and in particular to a flue gas self-heat exchange sulfuric acid low-pressure steam production efficiency optimization system. Background Art

[0002] As a waste heat steam production plant, the sulfuric acid plant is an energy platform for many chemical companies. Sub-high-pressure superheated steam can be produced by sulfur combustion and sulfur dioxide conversion, and low-pressure saturated steam can be produced by sulfur trioxide absorption heat. Due to the different acid production concentrations of various companies, there are large deviations in the absorption process design of various sulfuric acid plants, and there are great differences in the low-pressure steam production rate.

[0003] With the gradual promotion of low-temperature heat recovery technology, sulfuric acid plants are equipped with waste heat utilization devices that use sulfur trioxide to absorb heat to produce low-pressure saturated steam. However, low-pressure steam production is affected by the difference in acid concentration of sulfuric acid products, and no targeted process design is carried out.

[0004] Therefore, it is necessary to invent a flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system to solve the problem in the technology that the waste heat steam production capacity in the acid production process of the sulfuric acid device cannot be maximized.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system, comprising a No. 1 heat exchanger, a battery acid device, a No. 2 heat exchanger, a fuming sulfuric acid device and a converter, wherein the air inlet pipe of the No. 1 heat exchanger is connected to the battery acid device, the return air pipe of the battery acid device is connected to the air inlet of the No. 1 heat exchanger, the air inlet of the No. 1 heat exchanger is also connected to the converter, the return air pipe of the No. 1 heat exchanger is also connected to the No. 2 heat exchanger, and the air inlet of the No. 2 heat exchanger is connected to the fuming sulfuric acid device.

[0007] Preferably, the return air duct of the oleum device is connected to the return air pipe of the No. 2 heat exchanger, and a closed gas circulation loop is formed between the No. 2 heat exchanger and the oleum device.

[0008] Preferably, the air inlet of the No. 2 heat exchanger is also connected to an economizer and an HRS tower, the temperature between the No. 2 heat exchanger and the HRS tower continues to increase, and the steam refluxes into the No. 2 heat exchanger.

[0009] Preferably, the temperature in the air inlet pipe between the second heat exchanger and the economizer is 160-180°C, and the economizer is electrically connected to the converter.

[0010] Preferably, the No. 2 heat exchanger is newly added, and multiple No. 2 heat exchangers can be newly added. Adding multiple No. 2 heat exchangers can transfer the flue gas thermal energy toward the low-pressure waste heat steam production mechanism.

[0011] Preferably, the low-pressure waste heat steam generation mechanism is a sulfuric acid device, and the sulfuric acid device utilizes sulfur trioxide to absorb heat to generate low-pressure saturated steam, and the waste heat of the steam is utilized.

[0012] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0013] 1. The utility model uses multiple newly added heat exchangers to enhance the heat exchange between steam and gas, and uses the self-heat exchange of flue gas in each HRS tower to adjust the intake temperature of the low-pressure waste heat steam production system, improve the utilization rate of waste heat, and increase the production capacity of low-pressure steam. In addition, through multiple newly added flue gas heat exchangers, the flue gas heat energy is transferred to the low-pressure waste heat steam production device to increase the production capacity;

[0014] 2. The utility model reduces the heat energy of flue gas entering the fuming acid and battery acid absorption towers through the heat exchange of circulating water, thereby reducing the consumption of circulating water, and the operation of the entire waste heat steam production system is automated and unmanned. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall process of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the oleum device of the utility model.

[0018] Description of reference numerals:

[0019] 1. Heat exchanger No.1; 2. Battery acid unit; 3. Heat exchanger No.2; 4. Oleum unit; 5. Economizer; 6. Converter; 7. HRS tower. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] The utility model provides Figure 1-3The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system shown includes a heat exchanger No. 1, a battery acid device 2, a heat exchanger No. 2, a fuming sulfuric acid device 4 and a converter 6. The air inlet pipe of the heat exchanger No. 1 is connected to the battery acid device 2, the return air pipe of the battery acid device 2 is connected to the air inlet of the heat exchanger No. 1, the air inlet of the heat exchanger No. 1 is also connected to the converter 6, the return air pipe of the heat exchanger No. 1 is also connected to the heat exchanger No. 2, and the air inlet of the heat exchanger No. 2 is connected to the fuming sulfuric acid device 4.

[0022] The use of the newly added No. 2 heat exchanger 3 on the No. 1 heat exchanger 1 can increase the thermal energy of the generated steam, and the absorption efficiency of the thermal energy and waste heat of the steam is improved, thereby achieving optimization of production capacity.

[0023] The return air pipeline of the oleum device 4 is connected with the return air pipe of the No. 2 heat exchanger 3, and a closed gas circulation loop is formed between the No. 2 heat exchanger 3 and the oleum device 4. The air inlet of the No. 2 heat exchanger 3 is also connected to the economizer 5 and the HRS tower 7. The temperature between the No. 2 heat exchanger 3 and the HRS tower 7 continues to rise, and the steam flows back into the No. 2 heat exchanger 3. The temperature in the air inlet pipe between the No. 2 heat exchanger 3 and the economizer 5 is 160-180℃, and the economizer 5 is electrically connected to the converter 6. The No. 2 heat exchanger 3 is newly added, and multiple No. 2 heat exchangers 3 can be added. The addition of multiple No. 2 heat exchangers 3 can transfer the flue gas thermal energy toward the low-pressure waste heat steam production mechanism.

[0024] The increase of 3 can absorb the waste heat of steam faster, and the temperature at 7 can be increased by utilizing the effect of 6, thereby increasing the production capacity of 7 and the heating operating temperature of 5. The heat will naturally flow toward the low temperature direction and transport the heat energy toward the low-pressure waste heat steam production mechanism.

[0025] The low-pressure waste heat steam generation mechanism is a sulfuric acid equipment. The sulfuric acid device utilizes sulfur trioxide to absorb heat to generate low-pressure saturated steam, and the waste heat of the steam is utilized.

[0026] The heat absorbed by the low-pressure waste heat steam generation mechanism increases, which reduces the consumption and use of circulating water, and the energy consumption of the entire acidification process will be significantly reduced.

[0027] Working principle of this utility model:

[0028] Refer to the instruction manual Figure 1-3 When using the utility model, firstly, the gas is transported between the first heat exchanger 1 and the battery acid device 2, and a closed gas circulation reflux is formed, and the low-pressure steam in the process is recycled by the first heat exchanger 1;

[0029] When the utility model is used, the newly added No. 2 heat exchanger 3 is connected with the oleum device 4, and is connected with the economizer 5 and the HRS tower 7, so that the steam temperature of the HRS tower 7 inlet is increased, and the steam capacity of the HRS tower 7 is achieved between 1.0-1.2Pa. At this time, the temperature of the economizer 5 inlet is within the range of 160-180°C. The temperature of the waste heat steam is increased to increase the capacity of the low-pressure steam, reduce the use of circulating water, and reduce consumption ( Figure 2 The solid line in the figure represents the air inlet line, and the dotted line represents the air return line).

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system, characterized by: The invention comprises a first heat exchanger (1), a battery acid device (2), a second heat exchanger (3), an oleum device (4) and a converter (6), wherein the air inlet pipe of the first heat exchanger (1) is connected to the battery acid device (2), the air return pipe of the battery acid device (2) is connected to the air inlet of the first heat exchanger (1), the air inlet of the first heat exchanger (1) is also connected to the converter (6), the air return pipe of the first heat exchanger (1) is also connected to the second heat exchanger (3), and the air inlet of the second heat exchanger (3) is connected to the oleum device (4).

2. The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system according to claim 1 is characterized by: The return air pipeline of the oleum device (4) is connected to the return air pipe of the No. 2 heat exchanger (3), and a closed gas circulation loop is formed between the No. 2 heat exchanger (3) and the oleum device (4).

3. The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system according to claim 1 is characterized by: The air inlet of the second heat exchanger (3) is also connected to the economizer (5) and the HRS tower (7). The temperature between the second heat exchanger (3) and the HRS tower (7) is continuously increased, and the steam flows back into the second heat exchanger (3).

4. The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system according to claim 3 is characterized by: The temperature in the air inlet pipe between the second heat exchanger (3) and the economizer (5) is 160-180° C., and the economizer (5) and the converter (6) are electrically connected.

5. The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system according to claim 4 is characterized in that: The No. 2 heat exchanger (3) is newly added, and a plurality of No. 2 heat exchangers (3) can be newly added. Adding a plurality of No. 2 heat exchangers (3) can transfer the heat energy of the flue gas toward the low-pressure waste heat steam production mechanism.

6. The flue gas self-heating sulfuric acid low-pressure steam production efficiency optimization system according to claim 5 is characterized in that: The low-pressure waste heat steam generation mechanism is a sulfuric acid device, in which the sulfuric acid device utilizes sulfur trioxide to absorb heat to generate low-pressure saturated steam, and the waste heat of the steam is utilized.

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