Steam condensate recycling system

Abstract

The utility model discloses a steam condensate recycling system which comprises a low-pressure steam pipeline and a medium-low-pressure steam pipeline in a plant area, drain valves are arranged at drainage discharge ports of the low-pressure steam pipeline and the medium-low-pressure steam pipeline, and the drainage discharge ports of the steam pipelines are communicated with a condensate recycling header pipe through drainage pipes. And the condensate recovery header pipe is arranged below an underground frozen soil layer. And by arranging the drain valve, the effects of blocking steam and draining water can be achieved. Due to the fact that the collected condensate is non-pressure, the condensate recovery header pipe is designed to have a gradient, and the condensate can be smoothly collected into the steam condensate recovery tank. After being treated, the condensate can be recycled, and steam is generated for cyclic utilization, so that recycling of the steam condensate in a factory area is realized.

Description

Technical field:

[0001] The utility model relates to the field of steam condensate recycling, in particular to a steam condensate recycling system. Background technology:

[0002] In chemical enterprises, many steam pipes are set up. In order to prevent the condensate produced by the condensation of steam in the pipe due to the decrease in temperature from accumulating water in the pipe and affecting the normal and stable operation of the steam system, it is necessary to set up a drain on the steam pipe, and the steam drain valve is in a normally open state to facilitate the timely discharge of the condensate from the steam pipe. However, due to the large number of drains, the amount of steam condensate discharged from each drain is not very large, so it is currently directly discharged. However, for the entire enterprise, the total amount of steam condensate discharged every day will be relatively large. In addition, steam condensate will also be generated during the use of heating heat exchangers and bathhouse heaters in the factory area. At present, it is also directly discharged, resulting in a huge waste of water resources. Utility model content:

[0003] In order to solve the above problems, the utility model aims to provide a steam condensate recovery and utilization system.

[0004] The utility model is implemented by the following technical solutions:

[0005] A steam condensate recovery and utilization system comprises a low-pressure steam pipeline and a medium-low pressure steam pipeline in a plant area, wherein drain valves are arranged at the drain outlets of the low-pressure steam pipeline and the medium-low pressure steam pipeline, and the drain outlets of the steam pipeline are connected to a condensate recovery main pipe through a drainage pipe, and the condensate recovery main pipe is arranged below the frozen soil layer underground, thus effectively solving the problem that the pipeline is easily frozen in winter and ice is attached to the connection to injure people;

[0006] The water outlet of the condensate recovery main pipe is connected to the water inlet of the steam condensate recovery tank, the water outlet of the steam condensate recovery tank is connected to the water inlet of the raw water tank through a pipeline, the water outlet of the raw water tank is connected to the heat medium inlet of the heat exchanger through a pipeline, the heat medium inlet of the heat exchanger is connected to the water inlet of the multi-media filter through a pipeline, the water outlet of the multi-media filter is connected to the water inlet of the security filter through a pipeline, the water outlet of the security filter is connected to the water inlet of the reverse osmosis desalination device through a pipeline, and the water outlet of the reverse osmosis desalination device is connected to the decarbonization device through a pipeline. The water inlet of the decarbonizer is connected, the water outlet of the decarbonizer is connected with the water inlet of the intermediate water tank through a pipeline, the water outlet of the intermediate water tank is connected with the water inlet of the mixed ion exchanger through a pipeline, the water outlet of the mixed ion exchanger is connected with the water inlet of the pure water tank through a pipeline, the water outlet of the pure water tank is connected with the water inlet of the by-product steam synthesis furnace of the chlor-alkali plant through a pipeline, the steam outlet of the by-product steam synthesis furnace is connected with the steam inlet of the steam distribution table through a pipeline, and the steam outlet of the steam distribution table is connected with a 0.4MPa low-pressure steam pipeline to the caustic soda production device for heat exchange.

[0007] Furthermore, the water outlet of the pure water tank is also connected to the water inlet of the waste heat boiler through a pipeline, and the steam outlet of the waste heat boiler is connected to the 0.88MPa medium and low pressure steam pipeline to each user.

[0008] Furthermore, a liquid level sensor is provided in the steam condensate recovery tank, and a condensate recovery pump is provided on a pipeline connecting the steam condensate recovery tank and the raw water tank;

[0009] The liquid level sensor is signal-connected to a signal input terminal of a controller, and a signal output terminal of the controller is signal-connected to a signal input terminal of the condensate recovery pump.

[0010] Furthermore, the condensate recovery main pipe has a slope, and the lowest point of the condensate recovery main pipe is located at the water outlet end of the condensate recovery main pipe.

[0011] Advantages of the utility model:

[0012] By setting up a steam trap, it can play the role of steam blocking and water drainage. Since the collected condensate is pressureless, by designing the condensate recovery main pipe with a slope, the condensate can be smoothly collected into the steam condensate recovery tank. After the condensate is treated, it can be reused and generate steam for recycling, thereby realizing the recycling and reuse of steam condensate in the plant. Description of the drawings:

[0013] Figure 1 is a schematic diagram of system connection of this embodiment;

[0014] In the figure: low-pressure steam pipeline 1, medium- and low-pressure steam pipeline 2, steam trap 3, drainage pipe 4, condensate recovery main pipe 5, steam condensate recovery tank 6, raw water tank 7, heat exchanger 8, multi-media filter 9, security filter 10, reverse osmosis desalination device 11, decarbonizer 12, intermediate water tank 13, mixed ion exchanger 14, pure water tank 15, by-product steam synthesis furnace 16, steam distribution table 17, waste heat boiler 18, liquid level sensor 19, condensate recovery pump 20, controller 21. Specific implementation method:

[0015] like Figure 1 A steam condensate recovery and utilization system shown in the figure comprises a low-pressure steam pipeline 1 and a medium-low pressure steam pipeline 21 in a plant area, a steam trap 3 is provided at the drainage outlets of the low-pressure steam pipeline 1 and the medium-low pressure steam pipeline 21, and the drainage outlets of the steam pipelines are connected to a condensate recovery main pipe 5 through a drainage pipe 4, and the condensate recovery main pipe 5 is arranged under the frozen soil layer underground, which well solves the problem that the pipelines are easily frozen in winter and ice is hung on the connection to injure people;

[0016] The water outlet of the condensate recovery main pipe 5 is connected to the water inlet of the steam condensate recovery tank 6, the water outlet of the steam condensate recovery tank 6 is connected to the water inlet of the raw water tank 7 through a pipeline, the water outlet of the raw water tank 7 is connected to the heat medium inlet of the heat exchanger 8 through a pipeline, the heat medium inlet of the heat exchanger 8 is connected to the water inlet of the multi-media filter 9 through a pipeline, the water outlet of the multi-media filter 9 is connected to the water inlet of the security filter 10 through a pipeline, the water outlet of the security filter 10 is connected to the water inlet of the reverse osmosis desalination device 11 through a pipeline, the water outlet of the reverse osmosis desalination device 11 is connected to the water inlet of the decarbonizer 12 through a pipeline. The water outlet of the decarbonizer 12 is connected to the water inlet of the intermediate water tank 13 through a pipeline, the water outlet of the intermediate water tank 13 is connected to the water inlet of the mixed ion exchanger 14 through a pipeline, the water outlet of the mixed ion exchanger 14 is connected to the water inlet of the pure water tank 15 through a pipeline, the water outlet of the pure water tank 15 is connected to the water inlet of the by-product steam synthesis furnace 16 of the chlor-alkali plant through a pipeline, the steam outlet of the by-product steam synthesis furnace 16 is connected to the steam inlet of the steam distribution table 17 through a pipeline, and the steam outlet of the steam distribution table 17 is connected to the 0.4MPa low-pressure steam pipeline 1 to the caustic soda production device for heat exchange. The water outlet of the pure water tank 15 is also connected to the water inlet of the waste heat boiler 18 through a pipeline, and the steam outlet of the waste heat boiler 18 is connected to the medium and low pressure steam pipeline 21 of 0.88MPa to each user.

[0017] A liquid level sensor 19 is provided in the steam condensate recovery tank 6, and a condensate recovery pump 20 is provided on the pipeline connecting the steam condensate recovery tank 6 and the raw water tank 7; the liquid level sensor 19 is signal-connected to the signal input end of the controller 21, and the signal output end of the controller 21 is signal-connected to the signal input end of the condensate recovery pump 20.

[0018] The condensate recovery main pipe 5 has a slope, and the lowest point of the condensate recovery main pipe 5 is located at the water outlet end of the condensate recovery main pipe 5 .

[0019] Job Description:

[0020] The steam condensate generated by the low-pressure steam pipeline 1 and the medium- and low-pressure steam pipeline 21 in the plant area is drained into the condensate recovery main pipe 5 through the drainage pipe 4 and is uniformly collected in the steam condensate recovery tank 6. When the liquid level sensor 19 detects that the liquid level in the steam condensate recovery tank 6 reaches the preset high liquid level, the condensate recovery pump 20 is started, and the recovered condensate is pumped into the raw water tank 7 for buffering, and then enters the heat exchanger 8 for cooling, and then enters the multi-media filter 9 and the security filter 10 in turn to filter out the extremely small particles contained in the condensate, and then is sent to the reverse osmosis desalination device 11 for desalination treatment. The reverse osmosis produced water passes through the decarbonizer 12 to remove the CO2 therein and then enters the intermediate water tank 13. After that, the mixed ion exchanger 14 further removes the soluble solid matter ions in the water to make the conductivity ≤0.2μS / cm, and then enters the pure water tank 15. A part of it is sent to the by-product steam synthesis furnace 16 to produce by-product steam. The generated steam is sent to the low-pressure steam pipeline 1 after passing through the steam distribution table 17 to be transported to each user; the other part is sent to the waste heat boiler 18 to generate medium and low pressure steam and sent to the medium and low pressure steam pipeline 21 to be transported to each user.

[0021] In this embodiment, the steam trap 3 is provided to prevent steam from draining. Since the collected condensate is pressureless, the condensate recovery main pipe 5 is designed with a slope, so that the condensate can be smoothly collected into the steam condensate recovery tank 6. After the condensate is processed, it can be reused and steam can be generated for recycling, thereby realizing the recycling of the steam condensate in the plant.

[0022] Through the measurement and statistics of steam condensate at each location in the factory, if the steam condensate is centrally recovered according to this embodiment, about 6,000 tons can be recovered each year. After recovery, it can not only improve the operating efficiency of the steam system and reduce the waste of resources, but also save costs for the enterprise and improve economic benefits. At the same time, it is also an important manifestation of the enterprise fulfilling its social responsibility, improving the corporate environmental protection image, and promoting sustainable development.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam condensate recovery and utilization system, comprising a low-pressure steam pipeline and a medium- and low-pressure steam pipeline within a plant area, characterized in that: A steam trap is provided at the drain outlet of the low-pressure steam pipeline and the medium- and low-pressure steam pipelines, and the drain outlet of the steam pipeline is connected to a condensate recovery main pipe through a drainage pipe, and the condensate recovery main pipe is arranged below the frozen soil layer underground; The water outlet of the condensate recovery main pipe is connected to the water inlet of the steam condensate recovery tank, the water outlet of the steam condensate recovery tank is connected to the water inlet of the raw water tank through a pipeline, the water outlet of the raw water tank is connected to the heat medium inlet of the heat exchanger through a pipeline, the heat medium inlet of the heat exchanger is connected to the water inlet of the multi-media filter through a pipeline, the water outlet of the multi-media filter is connected to the water inlet of the security filter through a pipeline, the water outlet of the security filter is connected to the water inlet of the reverse osmosis desalination device through a pipeline, and the reverse osmosis desalination device The water outlet is connected with the water inlet of the decarbonizer through a pipeline, the water outlet of the decarbonizer is connected with the water inlet of the intermediate water tank through a pipeline, the water outlet of the intermediate water tank is connected with the water inlet of the mixed ion exchanger through a pipeline, the water outlet of the mixed ion exchanger is connected with the water inlet of the pure water tank through a pipeline, the water outlet of the pure water tank is connected with the water inlet of the by-product steam synthesis furnace through a pipeline, the steam outlet of the by-product steam synthesis furnace is connected with the steam inlet of the steam distribution table through a pipeline, and the steam outlet of the steam distribution table is connected with the low-pressure steam pipeline.

2. A steam condensate recovery and utilization system according to claim 1, characterized in that: The water outlet of the pure water tank is also connected to the water inlet of the waste heat boiler through a pipeline, and the steam outlet of the waste heat boiler is connected to the medium and low pressure steam pipelines.

3. A steam condensate recovery and utilization system according to claim 1, characterized in that: A liquid level sensor is provided in the steam condensate recovery tank, and a condensate recovery pump is provided on a pipeline connecting the steam condensate recovery tank and the raw water tank; The liquid level sensor is signal-connected to a signal input terminal of a controller, and a signal output terminal of the controller is signal-connected to a signal input terminal of the condensate recovery pump.

4. A steam condensate recovery and utilization system according to claim 1, characterized in that: The condensate recovery main pipe has a slope, and the lowest point of the condensate recovery main pipe is located at the water outlet end of the condensate recovery main pipe.

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