CN217058464U - Low-temperature-level heat energy recycling device in sulfuric acid production device - Google Patents
Low-temperature-level heat energy recycling device in sulfuric acid production device Download PDFInfo
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- CN217058464U CN217058464U CN202220661661.9U CN202220661661U CN217058464U CN 217058464 U CN217058464 U CN 217058464U CN 202220661661 U CN202220661661 U CN 202220661661U CN 217058464 U CN217058464 U CN 217058464U
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Abstract
The utility model discloses a low temperature position heat recovery utilizes device in sulphuric acid apparatus for producing relates to waste heat recovery technical field in the sulphuric acid production. The device comprises a desalted water storage tank, a water pump, a liquid ammonia evaporator and a secondary acid absorption cooler which are sequentially connected, wherein an ammonia gas outlet of the liquid ammonia evaporator is sequentially connected with a gas ammonia superheater and a gas ammonia buffer tank, a liquid inlet of the gas ammonia superheater is connected with an outlet of a sulfur melting condenser, and a liquid outlet of the gas ammonia superheater is connected with the desalted water storage tank; the liquid outlet of the secondary acid absorption cooler is connected with a desalted water storage tank, and the sulfuric acid inlet and the sulfuric acid outlet of the secondary acid absorption cooler are respectively connected with a primary circulating pump and a primary tower. Through the setting of desalinized water storage tank, collect steam or the comdenstion water that low temperature position heat energy produced to liquid ammonia gasification is used for gas ammonia superheating with the comdenstion water of melting sulfur condenser in the gas ammonia superheater, and uses desalinized water and two to inhale the acid and carry out the heat transfer, reduces the use of recirculated cooling water, the low temperature position heat energy in the make full use of sulphuric acid course of working.
Description
Technical Field
The utility model relates to a waste heat recovery technical field in sulphuric acid production, concretely relates to low temperature position heat recovery utilizes device in sulphuric acid apparatus for producing.
Background
In the production process of sulfuric acid, three main processes of combustion of a sulfur-containing raw material, oxidation of sulfur dioxide and absorption of sulfur trioxide are accompanied by release of a large amount of chemical heat energy. Most of the heat energy is recycled, but the low-temperature heat energy occupies a large proportion and has a low utilization rate. The low-temperature heat energy refers to the heat transferred to the dry absorption process after the high-temperature heat energy and the medium-temperature heat energy are recovered through the conversion process in the conventional sulfuric acid production device, and the total of the generated heat of the sulfuric acid, the steam condensation heat and the sulfuric acid dilution heat generated in the dry absorption process, for example, the heat in the sulfuric acid dry absorption circulating acid is taken away through the heat exchange of circulating cooling water, and the water vapor generated after the circulating cooling water is evaporated is generally directly discharged, so that the waste of the heat is caused; meanwhile, the steam or condensed water in the sulfur melting condenser after heat exchange with the molten sulfur is also directly discharged, so that the waste of heat and water resources is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low-temperature position heat recovery utilizes device in sulphuric acid apparatus for producing, solve the low problem that leads to heat and wasting of resources of low-temperature heat recovery rate among the prior art.
In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a low temperature position heat recovery utilizes device in sulphuric acid apparatus for producing which characterized in that: the system comprises a desalted water storage tank, a water pump, a liquid ammonia evaporator and a secondary acid absorption cooler which are sequentially connected, wherein an ammonia gas outlet of the liquid ammonia evaporator is sequentially connected with a gas ammonia superheater and a gas ammonia buffer tank, a liquid inlet of the gas ammonia superheater is connected with an outlet of a sulfur melting condenser, and a liquid outlet of the gas ammonia superheater is connected with the desalted water storage tank; the liquid outlet of the secondary acid absorption cooler is connected with a desalted water storage tank, and the sulfuric acid inlet and the sulfuric acid outlet of the secondary acid absorption cooler are respectively connected with a primary circulating pump and a primary tower.
A further technical scheme is that a heat exchanger is arranged between the liquid ammonia evaporator and the secondary acid absorption cooler, and a cooling water inlet and a cooling water outlet of the heat exchanger are respectively connected with a cooling water tank.
The still further technical proposal is that the desalted water storage tank is connected with a low-pressure steam inlet pipe.
A further technical scheme is that a conductivity analyzer is arranged on an outlet pipeline of the water pump.
The still further technical scheme is that the desalted water storage tank is used for storing desalted water, and a temperature sensor is arranged in the desalted water storage tank.
The further technical proposal is that the liquid outlet of the liquid ammonia evaporator is connected with a desalted water storage tank.
The working principle is as follows: steam and condensate water generated by low-temperature heat energy are added into a desalination water tank as desalted water, the temperature of the desalination water in the desalination water tank is about 60 ℃, the desalted water is pumped into a tube pass of a liquid ammonia evaporator through a water pump and exchanges heat with liquid ammonia in a shell pass, the liquid ammonia is evaporated into gaseous ammonia through heat absorption and enters a gaseous ammonia superheater, the gaseous ammonia is subjected to heat exchange with the condensate water (80-90 ℃) at the outlet of a sulfur melting condenser, the temperature of the gaseous ammonia is over-heated to 35-45 ℃, and the gaseous ammonia is merged into a gaseous ammonia pipe network for subsequent processes after passing through a gaseous ammonia buffer tank. The temperature of the desalted water from the liquid ammonia evaporator is about 50 ℃, the desalted water enters a secondary acid absorption cooler to exchange heat with secondary acid absorption inside the secondary acid absorption cooler, the temperature of the secondary acid absorption is reduced from 79 ℃ to 71 ℃, the desalted water returns to the desalted water storage tank to be recycled after the temperature of the desalted water is increased, and the condensed water after heat exchange in the gas ammonia superheater is sent to the desalted water storage tank to be recycled.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a low temperature position heat recovery utilizes device in simple structure's sulphuric acid apparatus for producing, setting through the desalinized water storage tank, collect steam or the comdenstion water that low temperature position heat energy produced, and be used for the liquid ammonia gasification, the comdenstion water that will melt the sulphur condenser is used for the gas ammonia overheated in the gas ammonia over heater, and use desalinized water and two to inhale the acid and carry out the heat transfer, reduce recirculated cooling water's use, low temperature position heat energy in the make full use of sulphuric acid course of working, steam has been reduced, the consumption of resources such as cooling water, make the energy obtain more reasonable utilization.
Drawings
Fig. 1 is a process schematic block diagram of the present invention.
In the figure: 1-desalted water storage tank, 2-liquid ammonia evaporator, 3-secondary acid absorption cooler, 4-gas ammonia superheater, 5-sulfur melting condenser, 6-water pump, 7-heat exchanger, 8-circulating cooling water pool, and 9-gas ammonia buffer tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a low-temperature-level heat energy recycling device in a sulfuric acid production device, which comprises a desalted water storage tank 1, a water pump 6, a liquid ammonia evaporator 2 and a secondary acid absorption cooler 3 which are connected in sequence, wherein a liquid ammonia inlet of the liquid ammonia evaporator 2 is connected with a liquid ammonia spherical tank through a regulating valve, an ammonia outlet of the liquid ammonia evaporator 2 is connected with a gas ammonia superheater 4 and a gas ammonia buffer tank 9 in sequence, a liquid inlet of the gas ammonia superheater 4 is connected with an outlet of a sulfur melting condenser 5, cooling water and sulfur melting heat exchange are carried out in the sulfur melting condenser 5, and obtained steam and condensate water are discharged through an outlet of the sulfur melting condenser 5. The condensate water and the gas ammonia further exchange heat in the gas ammonia superheater 4, the condensate water is connected with the desalted water storage tank 1 through a liquid outlet of the gas ammonia superheater 4, a liquid outlet of the secondary acid absorption cooler 3 is connected with the desalted water storage tank 1, and when the desalted water in the desalted water tank 1 is insufficient, the condensate water is connected with the desalted water storage tank 1 through a liquid outlet of the liquid ammonia evaporator 2, so that the supplement can be performed. The desalted water is steam condensate water, namely desalted water, contained in the desalted water storage tank 1, and the problem that a large amount of scales are formed on the inner wall of a pipeline can be greatly reduced by the desalted water. The sulfuric acid inlet and the sulfuric acid outlet of the secondary acid absorption cooler 3 are respectively connected with a primary circulating pump and a primary tower, and the secondary acid absorption is further subjected to heat exchange with desalted water in the secondary acid absorption cooler 3.
In order to better control the temperature after the heat exchange of the secondary absorption acid, the temperature of the desalted water entering the secondary absorption acid cooler 3 needs to be strictly controlled, a heat exchanger 7 can be arranged on a connecting pipeline of the liquid ammonia evaporator 2 and the secondary absorption acid cooler 3 in parallel, a cooling water inlet and a cooling water outlet of the heat exchanger 7 are respectively connected with a circulating cooling water tank 8, the circulating cooling water and the desalted water are used for heat exchange at the heat exchanger 7, when the temperature of the desalted water is higher, the water in the circulating cooling water tank 8 is used for cooling, and when the temperature of the desalted water is proper, the water is directly sent into the secondary absorption acid cooler 3.
In order to control the temperature of the desalted water in the desalted water tank 1 conveniently, a temperature sensor is arranged in the desalted water tank 1, and when the temperature of the desalted water is not enough, particularly when a sulfuric acid production device is stopped, low-pressure steam is introduced through a low-pressure steam inlet pipe to heat the desalted water. A conductivity analyzer is arranged on an outlet pipeline of the water pump 6 to ensure that the conductivity of desalted water is less than or equal to 30 us/cm.
When the device is used, the temperature of desalted water in the desalted water storage tank 1 is about 60 ℃, the desalted water is pumped into a tube pass of the liquid ammonia evaporator 2 through the water pump 6 to exchange heat with liquid ammonia in a shell pass, the liquid ammonia absorbs heat and is evaporated into gas ammonia to enter the gas ammonia superheater 4, the gas ammonia superheater 4 exchanges heat with condensate water (80-90 ℃) at the outlet of the sulfur melting condenser, the temperature of the gas ammonia is superheated to 35-45 ℃, and the gas ammonia is merged into a gas ammonia pipe network to be used in subsequent processes after passing through the gas ammonia buffer tank 9.
The temperature of the desalted water from the liquid ammonia evaporator 4 is about 50 ℃, the desalted water enters a secondary acid absorption cooler 3 to exchange heat with the secondary acid absorption inside, the temperature of the secondary acid absorption is reduced from 79 ℃ to 71 ℃, the desalted water returns to the desalted water storage tank 1 to be recycled after the temperature of the desalted water is increased, and the condensed water after heat exchange in the gas ammonia superheater 4 is sent to the desalted water storage tank 1 to be recycled.
If the temperature of the desalted water from the liquid ammonia evaporator 4 is too high, the desalted water is sent into the heat exchanger 7 to exchange heat with the circulating cooling water for cooling, and then sent into the secondary acid absorption cooler 3, and when the desalted water in the desalted water storage tank 1 is insufficient, the desalted water from the liquid ammonia evaporator 4 can be sent into the desalted water storage tank 1 for recycling.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements within the scope of the disclosure, the drawings and the claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a low temperature position heat recovery utilizes device in sulphuric acid apparatus for producing which characterized in that: the system comprises a desalted water storage tank (1), a water pump (6), a liquid ammonia evaporator (2) and a secondary acid absorption cooler (3) which are sequentially connected, wherein an ammonia gas outlet of the liquid ammonia evaporator (2) is sequentially connected with a gas ammonia superheater (4) and a gas ammonia buffer tank (9), a liquid inlet of the gas ammonia superheater (4) is connected with an outlet of a sulfur melting condenser (5), and a liquid outlet of the gas ammonia superheater (4) is connected with the desalted water storage tank (1); the liquid outlet of the secondary acid absorption cooler (3) is connected with the desalted water storage tank (1), and the sulfuric acid inlet and the sulfuric acid outlet of the secondary acid absorption cooler (3) are respectively connected with the primary circulating pump and the primary tower.
2. The low-temperature-level heat energy recycling device in the sulfuric acid production device according to claim 1, characterized in that: a heat exchanger (7) is arranged between the liquid ammonia evaporator (2) and the secondary acid absorption cooler (3), and the cooling water inlet and the cooling water outlet of the heat exchanger (7) are respectively connected with a circulating cooling water tank (8).
3. The low-temperature-level heat energy recycling device in the sulfuric acid production device according to claim 1, characterized in that: the desalted water storage tank (1) is connected with a low-pressure steam inlet pipe.
4. The low-temperature-level heat energy recycling device in the sulfuric acid production device according to claim 1, characterized in that: and a conductivity analyzer is arranged on an outlet pipeline of the water pump (6).
5. The low-temperature-level heat energy recycling device in the sulfuric acid production device according to claim 1, characterized in that: the desalted water storage tank (1) is used for storing desalted water, and a temperature sensor is arranged in the desalted water storage tank (1).
6. The low-temperature-level heat energy recycling device in the sulfuric acid production device according to claim 1, characterized in that: the liquid outlet of the liquid ammonia evaporator (2) is connected with the desalted water storage tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220661661.9U CN217058464U (en) | 2022-03-24 | 2022-03-24 | Low-temperature-level heat energy recycling device in sulfuric acid production device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220661661.9U CN217058464U (en) | 2022-03-24 | 2022-03-24 | Low-temperature-level heat energy recycling device in sulfuric acid production device |
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| CN217058464U true CN217058464U (en) | 2022-07-26 |
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| CN202220661661.9U Active CN217058464U (en) | 2022-03-24 | 2022-03-24 | Low-temperature-level heat energy recycling device in sulfuric acid production device |
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