阅读说明：本技术 一种蒸汽产生系统 (Steam generation system ) 是由 徐敬玉 于 2021-08-27 设计创作，主要内容包括：一种蒸汽产生系统,蒸汽产生部分与溶液再生部分之间循环流动有吸湿性溶液,废蒸汽管道与吸收器相连,废蒸汽管道内流动着废蒸汽,废蒸汽流入所述吸收器,吸收器内的吸湿性溶液与废蒸汽直接接触,并吸收废蒸汽,吸收过程放出热量,进水管道与蒸汽产生系统相连,工艺蒸汽管道与工艺水闪蒸罐相连,工艺水流入吸收器内换热管后,被吸湿性溶液吸收废蒸汽过程中放出的热量加热,进入所述工艺水闪蒸罐内闪蒸出工艺蒸汽,工艺水闪蒸罐内产生的工艺蒸汽进入所述工艺蒸汽管道。废蒸汽中蕴含的能量在被吸湿性溶液吸收的过程中转移至了吸收器内换热管中的工艺水,并最终生成高品质的工艺蒸汽,可回到工艺系统再利用或用于其他供热用途。(A steam generation system is characterized in that a hygroscopic solution flows between a steam generation part and a solution regeneration part in a circulating mode, a waste steam pipeline is connected with an absorber, waste steam flows in the waste steam pipeline and flows into the absorber, the hygroscopic solution in the absorber is in direct contact with the waste steam and absorbs the waste steam, heat is emitted in the absorption process, a water inlet pipeline is connected with a steam generation system, a process steam pipeline is connected with a process water flash tank, process water flows into a heat exchange pipe in the absorber and is heated by the heat emitted in the process of absorbing the waste steam by the hygroscopic solution and enters the process water flash tank to be flashed, and process steam generated in the process water flash tank enters the process steam pipeline. The energy contained in the waste steam is transferred to the process water in the heat exchange tube in the absorber in the process of being absorbed by the hygroscopic solution, and finally high-quality process steam is generated and can be returned to a process system for reuse or used for other heat supply purposes.)

1. A steam generation system is characterized by comprising a steam generation part, a solution regeneration part, a water inlet pipeline, a process steam pipeline and a waste steam pipeline, wherein a hygroscopic solution circularly flows between the steam generation part and the solution regeneration part, the steam generation part comprises an absorber and a process water flash tank, the waste steam pipeline is connected with the absorber, waste steam flows in the waste steam pipeline, the waste steam flows into the absorber, the hygroscopic solution in the absorber absorbs the waste steam and releases heat in the absorption process, the water inlet pipeline is connected with the steam generation part, process water in the water inlet pipeline flows into the steam generation part, part of the process water circulates between the process water flash tank and the absorber and forms a certain liquid level in the process water flash tank, and the process steam pipeline is connected with the process water flash tank, the process water flowing into the heat exchange tube in the absorber is heated by heat released in the process of absorbing the waste steam by hygroscopic solution, enters the process water flash tank to be flashed to obtain the process steam, the process steam generated in the process water flash tank enters the process steam pipeline, and the water inlet pipeline is not communicated with the waste steam pipeline.

2. The steam generation system of claim 1, wherein the solution regeneration section includes an evaporator, a solution flash tank; the hygroscopic solution in the absorber absorbs the waste steam to form a dilute solution, the dilute solution enters the evaporator for heat exchange, the temperature of the dilute solution rises, then the dilute solution enters the solution flash tank for flash evaporation, the dilute solution is converted into a concentrated solution after flash evaporation, and the concentrated solution enters the steam generation part through a pipeline.

3. The steam generation system of claim 2, wherein the solution regeneration section includes a steam compressor, and steam flashed off from the solution flash tank enters the steam compressor and is compressed into high temperature, high pressure steam that enters the evaporator for heating the dilute solution.

4. The steam generating system of claim 3, wherein the steam generating system comprises a preheating section, the preheating section comprises a water condensing tank and a preheater, the high-pressure steam flows through the evaporator and is condensed to enter the water condensing tank, part of liquid in the water condensing tank flows to the steam compressor to serve as outlet water supplement of the compressor, and part of liquid becomes preheating water which flows to the preheater to preheat process water of the water inlet pipeline.

5. The steam generation system of any one of claims 1-4, wherein an electric heater is disposed between the steam generation section and the solution regeneration section.

6. The steam generation system of claim 5, wherein the hygroscopic solution is one or more of a lithium bromide solution, a calcium bromide solution, and ethylene glycol.

7. The steam generation system of claim 5, wherein the absorber is provided with a vent.

8. The steam generation system of claim 1, wherein the process water in the water inlet conduit is pressurized demineralized water.

9. The steam generation system of claim 5, further comprising a solution treatment device disposed between the absorber and the electric heater, the solution treatment device having a solution storage tank, an alkali addition neutralization mechanism, and a cyclone filter press mechanism disposed therein.

Technical Field

The invention relates to the technical field of steam preparation, in particular to a steam generation system.

Background

In industrial fields such as refining, metallurgy or power generation, a large amount of waste steam (e.g. waste steam with a temperature below 90 ℃) is generated in the production process, and the waste steam is usually treated by condensation or direct evacuation. The waste steam generally contains higher energy, but because the temperature is lower, the waste steam is difficult to be directly utilized or efficiently utilized through direct heat exchange or a traditional heat pump heating mode. There is therefore a need for a waste heat recovery system that can efficiently utilize waste steam.

Disclosure of Invention

The invention aims to provide a steam generation system capable of efficiently utilizing waste steam.

In order to achieve the above purpose, the present invention provides the following technical solutions.

In a first aspect, a steam generation system includes a steam generation part, a solution regeneration part, a water inlet pipe, a process steam pipe, and a waste steam pipe, wherein a hygroscopic solution circularly flows between the steam generation part and the solution regeneration part, the steam generation part includes an absorber and a process water flash tank, the waste steam pipe is connected to the absorber, waste steam flows in the waste steam pipe, the waste steam flows into the absorber, the hygroscopic solution in the absorber absorbs the waste steam and releases heat during the absorption process, the water inlet pipe is connected to the steam generation part, process water in the water inlet pipe flows into the steam generation part, a part of the process water circulates between the process water flash tank and the absorber and forms a certain liquid level in the process water flash tank, and the process steam pipe is connected to the process water flash tank, the process water flowing into the heat exchange tube in the absorber is heated by heat released in the process of absorbing the waste steam by hygroscopic solution, enters the process water flash tank to be flashed to obtain the process steam, the process steam generated in the process water flash tank enters the process steam pipeline, and the water inlet pipeline is not communicated with the waste steam pipeline. In this way, the energy contained in the waste steam is transferred to the process water in the heat exchange tube in the absorber in the process of being absorbed by the hygroscopic solution, and finally high-quality process steam is generated and can be returned to the process system for utilization or used for other heat supply purposes, and the energy contained in the waste steam becomes the energy in the process steam which can be utilized.

With reference to the first aspect, in a first possible embodiment of the first aspect, the solution regeneration section comprises an evaporator, a solution flash tank; the hygroscopic solution in the absorber absorbs the waste steam to form a dilute solution, the dilute solution enters the evaporator for heat exchange, the temperature of the dilute solution rises, then the dilute solution enters the solution flash tank for flash evaporation, the dilute solution is converted into a concentrated solution after flash evaporation, and the concentrated solution enters the steam generation part through a pipeline. In this embodiment, the solution regeneration section changes the hygroscopic solution from a dilute solution to a concentrated solution to circulate the hygroscopic solution of the steam generation system.

With reference to the first embodiment of the first aspect, in a second possible embodiment of the first aspect, the solution regeneration portion includes a steam compressor, and the steam flashed off from the solution flash tank enters the steam compressor and is compressed into high-temperature and high-pressure steam, which enters the evaporator to heat the dilute solution. In the embodiment, the flashed steam is used for heating the dilute solution after passing through the steam compressor, so that the energy in the flashed steam is fully utilized, and the higher energy utilization rate is achieved.

In combination with the second embodiment of the first aspect, in a third possible embodiment of the first aspect, the steam generation system includes a preheating section, the preheating section includes a water condensing tank and a preheater, the high-pressure steam flows through the evaporator and is condensed and enters the water condensing tank, part of liquid in the water condensing tank flows to the steam compressor to be used as outlet water supplement of the compressor, and part of liquid becomes preheating water and flows to the preheater to preheat process water of the water inlet pipeline. In the embodiment, the preheating water preheats the process water of the water inlet pipeline, so that the energy of condensed water can be effectively utilized, and the higher energy utilization rate is achieved; meanwhile, part of liquid is used as the outlet water supplement of the compressor, so that the temperature of high-pressure steam can be reduced, and the evaporator has a better heat exchange effect.

With reference to the first aspect or any one of the first to third embodiments of the first aspect, in a fourth possible embodiment of the first aspect, an electric heater is disposed between the steam generation part and the solution regeneration part. In this embodiment, an electric heater is provided so that the concentration of the solution can be smoothly performed.

In a fifth possible embodiment of the first aspect in combination with the fourth embodiment of the first aspect, the hygroscopic solution is one or more of a lithium bromide solution, a calcium bromide solution, and ethylene glycol. In this embodiment, these solutions are used as the hygroscopic solution, which can effectively improve the absorption effect.

In a sixth implementation form of the first aspect in combination with the fourth embodiment of the first aspect, the absorber is provided with a gas outlet. In this embodiment, the non-condensable gases in the exhaust stream may be vented through a vent.

With reference to the first aspect, in a seventh embodiment of the first aspect, the process water in the water inlet conduit is pressurized demineralized water. Pressurized desalted water, meaning that the pressure of the process water exceeds a normal atmospheric pressure and is treated by desalting. In this embodiment, the process water is pressurized to raise the boiling point of the process water, thereby raising the temperature of the process steam, and the desalination process can prevent the scaling inside the system.

With reference to the fourth embodiment of the first aspect, in an eighth implementation manner of the first aspect, the system further includes a solution treatment device, the solution treatment device is disposed between the absorber and the electric heater, and the solution treatment device is provided with a solution storage tank, an alkali adding neutralization mechanism, and a cyclone filter pressing mechanism.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a steam generation system of the present invention.

Detailed Description

Specific embodiments will now be described in detail with reference to the accompanying drawings.

Fig. 1 illustrates a steam generation system 10, which includes a steam generation section 11, a solution regeneration section 12, a preheating section 13, a water inlet pipe 14, a process steam pipe 15, a waste steam pipe 16, an electric heater 17, and in some other embodiments, a solution treatment device may be provided. A hygroscopic solution is circulated between the steam generation section 11 and the solution regeneration section 12. The steam generation section 11 includes an absorber 111, a process water flash tank 112, a waste steam line 16 connected to the absorber 111, and a water inlet line 14 connected to the process water flash tank 112 and the absorber 111 of the steam generation section 11, as shown in fig. 1, the water inlet line 14 is connected to the absorber 111, a liquid level is formed in the process water flash tank 112, and process water circulates between the process water flash tank 112 and the absorber 111. The water inlet pipe 14 is not communicated with the waste steam pipe 16; process steam line 15 is connected to a process water flash drum 112. The process water flash tank 112 is connected to the absorber 111.

The waste steam (the waste steam may be steam with relatively low energy grade such as waste steam) flows in the waste steam pipeline 16, the waste steam flows into the absorber 111, the waste steam is directly contacted with the hygroscopic solution, and the hygroscopic solution in the absorber 111 absorbs the waste steam, so that heat is released in the absorption process.

The process water flows through the water inlet pipe 14, the process water in the water inlet pipe 14 flows into the heat exchange pipe in the absorber 111 and is heated, that is, the process water in the water inlet pipe 14 is heated by the heat emitted in the process of absorbing the waste steam by the hygroscopic solution after entering the absorber. And then enters the process water flash drum 112 to flash off the process steam. Process steam enters process steam line 15.

The absorber 111 is provided with a vent 113 and a portion of the non-condensable gases in the exhaust stream are removed from the vent 113.

The solution regeneration section 12 includes an evaporator 121, a solution flash tank 122, and a water vapor compressor 123, where the hygroscopic solution absorbs the waste vapor and becomes a dilute solution, the dilute solution enters the evaporator 121 to be heated, the temperature of the dilute solution rises, and then the dilute solution enters the solution flash tank 122 to be flashed in the solution flash tank 122, the dilute solution is converted into a concentrated solution after being flashed, and the concentrated solution enters the vapor generation section 11 through a pipeline.

The water vapor in the solution flash tank 122 enters a water vapor compressor 123, is compressed into high-temperature and high-pressure steam, and enters an evaporator 121 to heat the dilute solution.

The preheating part 13 includes a water condensing tank 131 and a preheater 132. High-pressure steam flows through and gets into condenser tank 131 after evaporimeter 121 condensation, and the liquid part in the condenser tank flows to the vapor compressor and as compressor outlet moisturizing, reduces high-pressure steam's temperature, can make high-pressure steam temperature more be close to condensing temperature like this, has better heat transfer effect in making its evaporimeter 121. At the same time, some of the liquid in the condenser tank becomes preheated water which flows to the preheater 132 for preheating the process water in the inlet conduit 14.

The electric heater 17 is disposed between the steam generation part 11 and the solution regeneration part 12.

The system is provided with a solution treatment device, the solution treatment device is arranged between the absorber 111 and the electric heater 17, and the solution treatment device is provided with a solution storage tank, an alkali adding neutralization mechanism, a rotational flow filter pressing mechanism and other structures.

The hygroscopic solution may be one or more of a lithium bromide solution, a calcium bromide solution, ethylene glycol.

The process water in the water inlet pipeline is pressurized desalted water, and the pressurized desalted water means water which is subjected to desalting treatment and has the pressure higher than one atmospheric pressure. The process water is pressurized, so that the boiling point of the process water can be increased, and the temperature of the process steam can be increased, for example, the process steam can be 120 ℃ steam through pressurization and has higher grade. The desalting treatment can prevent the fouling inside the system.