Dead steam condensing device suitable for waste heat power generation system

Abstract

The utility model provides a dead steam condensing device suitable for a waste heat power generation system, which comprises a spraying working medium storage tank, dead steam in an ammonia water circulation power generation system directly enters the spraying working medium storage tank, and a spraying pipe is arranged near an air inlet of the spraying working medium storage tank; and through the spraying pipe, the dead steam just entering the spraying working medium storage tank is subjected to contact type cooling by utilizing the low-temperature ammonia water which is in a liquid state in the spraying working medium storage tank. According to the ammonia water waste steam condensation device, ammonia water waste steam can be fully condensed, and the economic investment and the system power performance can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to an exhaust steam condensing device suitable for a waste heat power generation system. Background Art

[0002] Waste heat recovery power generation technology uses an intermediate medium to recover waste heat from industry, and then converts the intermediate medium into heat and electricity through four steps: evaporation, expansion, condensation and compression. Waste heat recovery power generation technology can significantly improve the utilization rate of fuel or energy in industrial production, and has a significant effect on industrial energy conservation and carbon reduction.

[0003] Among them, the use of ammonia water as the intermediate medium of the waste heat power generation system is conducive to improving the waste heat recovery efficiency. Since the boiling point of ammonia is much lower than that of water, it can be in a gasified state at a lower temperature. In the steam Rankine cycle, the temperature curves of the heat exchange process between water and high-temperature flue gas do not match well, the heat transfer temperature difference is large, and the irreversible loss is large; the endothermic evaporation of the ammonia water mixture is a variable temperature process, which can make the heat release process of the heat source better match the heat absorption process curve of the mixed working fluid, minimize the irreversible loss in the heat release process, and improve the thermal energy utilization efficiency. Therefore, the waste heat power generation system with ammonia water as the working fluid is currently mainly used in nuclear power, geothermal, industrial waste heat, solar energy and other fields.

[0004] In the ammonia circulation system, the exhaust back pressure at the turbine outlet is an important parameter that affects the thermal power conversion of the system. The exhaust back pressure is mainly affected by the exhaust steam condensation effect. Only when the exhaust steam is well condensed can the thermal efficiency of the system be well guaranteed. However, the lean ammonia solution and the exhaust steam in the mixer are prone to insufficient mixing, which in turn causes the condensation pressure to be too high, affecting the turbine outlet back pressure. When the conventional condenser in the steam Rankine cycle is used to condense the ammonia exhaust steam, there are often problems of poor condensation effect and high condenser temperature. The heat exchange area of ​​the condenser needs to be greatly increased to ensure the condensation effect, which is very unfavorable for the economic investment and the power performance of the system. Utility Model Content

[0005] In response to the problems existing in the prior art, the present application proposes a waste steam condensing device suitable for a waste heat power generation system, including a working fluid storage tank, wherein the exhaust steam in the ammonia water circulation power generation system directly enters the spray working fluid storage tank, and a spray pipe is provided near the air inlet of the working fluid storage tank; through the spray pipe, the low-temperature ammonia water that is already in liquid state in the working fluid storage tank is used to contact cool the exhaust steam that has just entered the working fluid storage tank.

[0006] Furthermore, it also includes a cooling pipeline, one end of which is connected to the spray pipe, and the other end of which is connected to the bottom of the working fluid storage tank, and the spray pipe is arranged at the top of the spray working fluid storage tank;

[0007] A circulation pump is provided on the cooling pipeline, and the circulation pump is used to pressurize the working medium in the cooling pipeline and pump the low-temperature ammonia water at the bottom of the spray working medium storage tank to the spray pipe.

[0008] Further, a cooler is provided on the cooling pipeline between the circulation pump and the spray pipe, and the cooler is connected with a first cooling water circulation pipeline.

[0009] Further, a cooling coil is also provided in the working medium storage tank.

[0010] Further, the cooling coil is arranged at a position close to the bottom in the working medium storage tank, and both ends of the cooling coil are connected with a second cooling water circulation pipeline.

[0011] Further, a first valve is provided at each end of the circulation pump on the cooling pipeline, and a second valve is provided on the cooling pipeline between the spray pipe and the cooler.

[0012] Further, each component is fixedly arranged on the base.

[0013] The beneficial effects of the exhaust steam condensation system provided by the present utility model compared with the prior art are as follows:

[0014] The present utility model can realize the full condensation of ammonia water exhaust steam, which is very effective for ensuring economic investment and system power performance. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the exhaust steam condensation system of the present utility model;

[0016] Figure 2 is the front view of the present utility model;

[0017] Figure 3 is the right view of the present utility model;

[0018] Figure 4 is the top view of the present utility model;

[0019] Figure 5 is the three-dimensional rendering of the present utility model.

[0020] Reference numerals and names of the drawings: 1. Working medium storage tank, 2. Cooling coil, 3. Circulation pump, 4. Spray pipe, 5. Cooler, 6. First valve, 7. Second valve, 8. Base. Detailed Embodiments

[0021] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0022] As Figure 1 shown, the exhaust steam condensation device applicable to the waste heat power generation system proposed in this application is composed of a working fluid storage tank 1, a circulation pump 3, a cooler 5, valves 6 and 7, and a base 8. The exhaust steam in the ammonia water circulation power generation system directly enters the working fluid storage tank 1, and a spray pipe 4 is arranged near the air inlet of the working fluid storage tank 1; through the spray pipe, the low-temperature ammonia water already in the liquid state in the working fluid storage tank 1 is used to perform contact cooling on the exhaust steam just entering the spray working fluid storage tank.

[0023] The working fluid storage tank 1 is used to store the ammonia water working fluid, with the upper part being the vapor phase and the lower part being the liquid phase. A spray pipe 4 is arranged in the vapor phase of the upper part. Ammonia water enters the spray pipe 4 and, after being sprayed through the spray pipe 4, absorbs and cools the ammonia water vapor in the vapor phase, causing the ammonia water mixed vapor in the vapor phase to condense. A cooling coil 2 is arranged in the liquid phase of the lower part, and the working fluid in the working fluid storage tank is cooled by external cooling water, which is mainly used for cooling the working fluid in the working fluid storage tank 1 under dynamic conditions of the system, and also plays a certain auxiliary role in cooling the working fluid.

[0024] It also includes a cooling pipeline. One end of the cooling pipeline is connected to the spray pipe 4, and the other end is connected to the bottom of the working fluid storage tank 1. The spray pipe 4 is arranged at the top inside the working fluid storage tank 1; a circulation pump 3 is arranged on the cooling pipeline, and the circulation pump 3 is used to pressurize the working fluid in the cooling pipeline and pump the low-temperature ammonia water at the bottom of the working fluid storage tank 1 to the spray pipe 4. A cooler 5 is arranged on the cooling pipeline between the circulation pump 3 and the spray pipe 4, and the cooler 5 is connected with a first cooling water circulation pipeline. It realizes the cooling of the sprayed working fluid, further reduces the temperature of the working fluid, and enables the cooled working fluid to cool the exhaust steam at a sufficiently low temperature after spraying.

[0025] A cooling coil 2 is also arranged inside the working fluid storage tank 1. The cooling coil 2 is arranged at a position close to the bottom inside the working fluid storage tank 1, and both ends of the cooling coil 2 are connected with a second cooling water circulation pipeline.

[0026] A first valve is arranged at both ends of the circulation pump 3 on the cooling pipeline, and a second valve is arranged between the spray pipe 4 and the cooler on the cooling pipeline. It realizes the cut-off of the pipeline working fluid during the equipment maintenance process and facilitates the maintenance.

[0027] When the external heat source of the waste heat power generation system changes or the load of the generator set changes (i.e., dynamic working conditions), the proportion of ammonia in the exhaust steam of the system changes significantly. At this time, if a traditional condenser is used, the back pressure of the turbine exhaust will rise rapidly because ammonia and water cannot be fully mixed, affecting the stable operation of the unit. By using the system described in the present utility model, through the control of the flow rate of the spraying working medium, the exhaust steam can be sprayed according to the changes in dynamic working conditions to promote the full mixing of ammonia and water, realizing the condensation of the exhaust steam. The system can control the frequency of the pump. During this period, the frequency of the pump can be automatically adjusted according to the pressure of the tank body, so as to realize the control of the flow rate of the spraying liquid, and then automatically adapt to the dynamic changes to achieve the full condensation of the exhaust steam.

[0028] In summary, the above are only the preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model. All equivalent changes and modifications made according to the scope of the present utility model patent and the content of the specification are within the scope covered by the present utility model patent.

Claims

1. An exhaust steam condensing device suitable for a waste heat power generation system, comprising a working fluid storage tank, characterized in that: The exhaust steam in the ammonia water cycle power generation system directly enters the working fluid storage tank, and a spray pipe is provided near the air inlet of the working fluid storage tank; through the spray pipe, the low-temperature ammonia water that is already in liquid state in the working fluid storage tank is used to contact cool the exhaust steam that has just entered the working fluid storage tank.

2. The condensing device according to claim 1, characterized in that: It also includes a cooling pipeline, one end of which is connected to the spray pipe, and the other end of which is connected to the bottom of the working fluid storage tank, and the spray pipe is arranged at the top of the working fluid storage tank; A circulating pump is provided on the cooling pipeline, and the circulating pump is used to pressurize the working medium in the cooling pipeline and pump the low-temperature ammonia water at the bottom of the spray working medium storage tank to the spray pipe.

3. The exhaust steam condensing device according to claim 2, characterized in that: A cooler is provided on the cooling pipeline between the circulation pump and the spray pipe, and the cooler is connected to a first cooling water circulation pipeline.

4. The exhaust steam condensing device according to claim 3, characterized in that: A cooling coil is also provided in the working fluid storage tank.

5. The exhaust steam condensing device according to claim 4, characterized in that: The cooling coil is arranged at a position close to the bottom of the working fluid storage tank, and both ends of the cooling coil are connected to a second cooling water circulation pipeline.

6. The exhaust steam condensing device according to claim 5, characterized in that: A first valve is respectively provided on both ends of the circulating pump on the cooling pipeline, and a second valve is provided on the cooling pipeline between the spray pipe and the cooler.

7. The condensing device according to claim 1, characterized in that: Each component is fixed on the base.

Images