Efficient demisting wastewater heat pump

Abstract

The utility model discloses an efficient demisting waste water heat pump, which belongs to the technical field of heat pumps and is characterized in that a plurality of parallel flash evaporation tanks are arranged below a demisting tank, the tops of the flash evaporation tanks are communicated with the demisting tank, the bottoms of the flash evaporation tanks are communicated through liquid discharge pipelines, a heat pump is arranged below the flash evaporation tanks, and the liquid discharge pipelines are communicated with the heat pump. And the demisting tank is connected with the heat pump through a steam exhaust pipeline. The flash tank is located on the upper portion of the heat pump, the occupied space of the system can be saved, meanwhile, the necessary net positive suction head of the water return pump is guaranteed, waste water in flash evaporation can be discharged in the negative pressure state, the ascending process of flash steam is increased through the demisting tank independently arranged on the upper portion of the flash tank, and the gravity demisting effect is enhanced; in addition, a demister with a larger area can be arranged in the independent demisting tank, the flow speed of flash steam passing through the demister is reduced, and the demisting effect is enhanced, so that the flash steam entering the heat pump is cleaner, pollution to a heat exchange tube is reduced, and the quality of flash condensed water is better.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heat pump, especially a high -efficient demisting wastewater heat pump. BACKGROUND

[0002] In the industrial production process, wastewater treatment and energy utilization has been an important link of attention. Many industrial production activities will produce a large amount of waste water containing waste heat, for example, electric power, chemical industry, iron and steel industry. At present, for the treatment of these waste heat wastewater, mostly only focus on basic discharge standard, directly discharge wastewater to the environment, not only causes the waste of water resources, more makes the large amount of waste heat contained in wastewater is wasted, unable to be effectively utilized. In the energy increasingly nervous, this kind of resource waste phenomenon undoubtedly increases the production cost of enterprise, also causes certain pressure to the environment.

[0003] In the desulfurization process of industrial waste gas, the treatment of desulfurization slurry also has many problems. In the traditional way, after the desulfurization slurry completes the desulfurization task, part is directly discarded, unable to realize recycling, leading to low resource utilization rate. Moreover, in the flash evaporation, demisting and other related processes, the treatment efficiency and effect of the existing equipment are not satisfactory, and incomplete demisting makes the liquid droplets carried in the steam cause corrosion, wear and tear and other damages to the subsequent equipment, reduce the service life of the equipment, increase the maintenance cost, and also affect the operation stability and energy conversion efficiency of the whole system. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a high -efficient demisting wastewater heat pump to solve the above problems existing in prior art.

[0005] Technical scheme: a high -efficient demisting wastewater heat pump, comprising: a demisting tank, a plurality of flash tanks are arranged below the demisting tank, the top of the plurality of flash tanks is communicated with the demisting tank, the bottom of the plurality of flash tanks is communicated by a liquid discharge pipeline, a heat pump is arranged below the flash tank, and the demisting tank is connected with the heat pump through a steam exhaust pipeline.

[0006] Further, the demisting tank comprises: a demisting tank body, and a demister is arranged in the demisting tank body.

[0007] Further, the demister is a baffle demister.

[0008] Further, the demisting tank further comprises a backwashing nozzle group for cleaning the demister.

[0009] Further, the backwashing nozzle group is located below or above the demister.

[0010] Further, a slurry pipeline is arranged on each of the plurality of flash tanks, and an electric control valve is arranged on the slurry pipeline.

[0011] Further, a support is arranged for bearing the horizontally arranged demisting tank and the flash tank.

[0012] Further, a liquid level meter is arranged on the flash tank.

[0013] Further, an observation lens is arranged on the flash tank.

[0014] Further, an access hole is arranged on the flash tank and the demisting tank, and a sealing access cover is arranged on the access hole. Beneficial effects

[0015] The present application arranges multiple flash tanks which can be adjusted according to the wastewater inflow to ensure the stability of the liquid level in the flash tank and the flow rate of the flash steam, the flash tank is located at the upper part of the heat pump, which can save the system land occupation, and ensures the necessary NPSH of the water withdrawal pump, which is beneficial to the withdrawal of the wastewater in the flash tank under the negative pressure state, the demisting tank arranged at the upper part of the flash tank increases the upward flow process of the flash steam, enhances the gravity demisting effect, in addition, the separate demisting tank can be provided with a larger area demisting device, which reduces the flow rate of the flash steam passing through the demisting device, enhances the demisting effect, and thus the flash steam entering the heat pump is cleaner, reduces the pollution to the heat exchange tube, and the flash condensate water quality is better. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the present application;

[0017] Figure 2 is a structural schematic view of the demisting device of the present application.

[0018] The drawings are as follows: flash tank 1, demisting tank 2, demisting tank body 21, demisting device 22, backwashing nozzle group 23, liquid discharge pipeline 3, heat pump 4, steam exhaust pipeline 5, slurry pipeline 6, electric control valve 7, support 8, liquid level meter 9, access hole 10, sealing access cover 11. DETAILED DESCRIPTION

[0019] In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, some technical features known in the art are not described in order not to obscure the present application.

[0020] As Figure 1 and Figure 2As shown, a high-efficiency defogging wastewater heat pump comprises: a defogging tank 2, a plurality of flash tanks 1 are arranged below the defogging tank 2, the top of each of the plurality of flash tanks 1 is communicated with the defogging tank 2, the bottom of each of the plurality of flash tanks 1 is communicated through a liquid discharge pipeline 3, a heat pump 4 is arranged below the flash tank 1, and the defogging tank 2 is connected with the heat pump 4 through a steam exhaust pipeline 5. The defogging tank 2 comprises: a defogging tank body 21, and a defogging device 22 is arranged in the defogging tank body 21. The defogging device 22 is a baffle defogging device. The defogging tank 2 further comprises a backwashing nozzle group 23 for cleaning the defogging device 22. The backwashing nozzle group 23 is arranged below or above the defogging device 22. A slurry pipeline 6 is arranged on each of the plurality of flash tanks 1, and an electric control valve 7 is arranged on the slurry pipeline 6. A support 8 is further arranged, and the support 8 is used for bearing the horizontally arranged defogging tank 2 and the flash tank 1. A liquid level meter 9 is arranged on the flash tank 1. An observation lens is arranged on the flash tank 1. A manhole 10 is arranged on each of the flash tank 1 and the defogging tank 2, a sealing manhole cover 11 is arranged on the manhole 10, a flash medium inlet is arranged on the flash tank 1. The defogging device 22 in the defogging tank 2 can also be a cyclone impeller defogging device, a complex baffle defogging device, a wire mesh defogging device, a tube bundle defogging device and the like, as long as it can realize gas-liquid separation, and the application is not limited.

[0021] The flash tank 1 is mainly used to flash the waste heat water in the tank under the negative pressure environment created by the vacuum pump. Multiple flash tanks 1 are arranged in parallel, which not only increases the treatment capacity of waste water, but also makes full use of waste heat. The liquid level meter 9 arranged in the tank can monitor the liquid level in the tank in real time, provide data support for stable operation of the system, and ensure that the liquid level in the tank is always within a reasonable range, avoiding the influence of too high or too low liquid level on the flashing effect. The observation lens is convenient for the operator to observe the waste water flashing condition in the tank at any time, such as steam production, bubble state, etc., so as to find out the abnormality in time and make adjustment. The manhole 10 on the flash tank and the matched sealing manhole cover 11 are convenient for equipment maintenance. When there is a fault in the tank or it needs to be checked regularly, the manhole cover is opened, and the maintenance personnel can enter the tank for maintenance, cleaning, etc. The flash tank 1 is connected with the bottom of the desulfurization tower through the desulfurization slurry inlet, and receives the desulfurization slurry as the medium to be flashed. The exhaust pipe 3 transports the desulfurization slurry after flashing back to the desulfurization tower for re-spraying, realizing the recycling of the desulfurization slurry and improving the resource utilization rate. The electric control valve 7 on the slurry pipeline 6 can flexibly control the medium flow between the flash tanks according to the system demand, balance the pressure and liquid level in the tank, and optimize the flashing process. The demister tank 2 is used to remove the liquid droplets carried in the flash steam, and ensure the purity of the steam entering the heat pump 4. The demister 22 arranged in the demister tank 2, especially the baffle demister, changes the flow direction of the steam through the unique baffle structure. When the steam carrying liquid droplets flows in the demister, the liquid droplets impact on the baffle due to inertia, and separate from the steam, slide down the baffle surface, effectively reducing the liquid droplet content in the steam. The demister tank 2 is also equipped with a backwashing nozzle group 23, which can be located below or above the demister 22. After the equipment runs for a period of time, impurities may accumulate on the surface of the demister, affecting the demisting effect. At this time, the backwashing nozzle group 23 will play a role, and the demister will be cleaned by spraying water flow, ensuring that the demister always maintains good working condition. The demister tank 2 is connected with the top of the flash tank 1, and receives the rising steam in the flash tank. At the same time, the demister tank 2 is connected with the heat pump 4 through the exhaust steam pipeline 5, and transports the demisted steam to the heat pump, providing high-quality heat source for the heat pump. The exhaust pipe 3 collects the desulfurization slurry after flashing in the flash tank 1, and transports it to the desulfurization tower for re-spraying. This process realizes the recycling of the desulfurization slurry, saves water resources, and ensures the continuous and stable operation of the desulfurization process in the desulfurization tower. In the transportation process, the exhaust pipe 3 needs to have good sealing performance and corrosion resistance to prevent slurry leakage and pipeline corrosion, and ensure the safe and reliable operation of the system. The heat pump 4 can use a compression heat pump or an absorption heat pump. The exhaust steam pipeline 5 is responsible for transporting the steam treated by the demister in the demister tank 2 to the heat pump 4. In the transportation process, it needs to have good heat preservation performance to reduce the loss of steam heat, and ensure that the steam can enter the heat pump at a high temperature and pressure, providing guarantee for the efficient operation of the heat pump.The support 8 serves as the supporting structure of the entire system and bears important mechanical support tasks. It horizontally bears the demisting tank 2 and the flash tank 1, ensuring the stability of the equipment during operation. The support 8 needs to have sufficient strength and stability to withstand the weight of the equipment and the vibration and stress generated during operation, providing a solid foundation for the safe and reliable operation of the system. The liquid level meter 9 is installed on the flash tank 1 to monitor the liquid level height in real time. Its measurement data is transmitted to the control system through signal transmission, and the control system controls the feed amount of wastewater or adjusts the medium flow between the flash tanks according to the liquid level signal. When the liquid level is too high, the control system can reduce the feed amount or open the electric control valve 7 on the slurry pipeline 6, and when the liquid level is too low, it can increase the feed amount to ensure that the liquid level in the flash tank is always within a reasonable working range, maintaining the stability of the flash process. The observation lens provides a window for the operator to directly observe the inside of the flash tank 1. Through the observation lens, the operator can directly see the flash state of the wastewater in the tank, such as the amount of steam generated, the size and distribution of bubbles, the splashing of liquid droplets, etc. These intuitive information helps the operator to timely discover abnormal phenomena in the flash process, such as poor flash effect, excessive liquid level fluctuation, etc., so as to take appropriate adjustment measures in time to ensure the normal operation of the system. The access opening 10 is provided on the flash tank 1 and the demisting tank 2, and the sealed access cover 11 is used to close the access opening. When the equipment is maintained or repaired, the sealed access cover 11 is opened, and the maintenance personnel can enter the tank to check, clean, replace parts, etc. The design of the access opening and the sealed access cover facilitates the maintenance and management of the equipment, helps to prolong the service life of the equipment, and improves the reliability of the system.

[0022] Working process:

[0023] System startup and preparation phase: Before starting the system, the operator first needs to conduct a comprehensive check on the entire equipment. Check whether the equipment connection is firm, whether the pipeline is leaking, and whether the valve is in normal closed or open state. Especially check whether the electrical connection of key equipment such as vacuum pump, heat pump is correct, and whether the lubricating oil is sufficient. After confirming that there is no error, start the vacuum pump to gradually form a negative pressure environment in the flash tank 1. At the same time, start the control system to calibrate the monitoring equipment such as the liquid level meter 9 and the observation lens, to ensure that the data is accurate and reliable.

[0024] Waste heat and wastewater enter the flash tank stage: When the negative pressure in the flash tank 1 reaches the set value, the waste heat and wastewater at the bottom of the desulfurization tower enter the flash tank 1 through the flash medium inlet. The wastewater is rapidly flashed under negative pressure, generating a large amount of steam. During the flashing process, part of the heat in the wastewater is released and converted into the heat energy of the steam. Due to the parallel arrangement of multiple flash tanks 1, the flashing area of the wastewater is increased, and the flashing efficiency is improved. The liquid level meter 9 monitors the liquid level in the flash tank in real time. The control system adjusts the frequency of the wastewater feed pump according to the liquid level signal to accurately control the feed amount of the wastewater, ensuring that the liquid level is stable within the set range. If the liquid level is too high, the feed pump frequency is reduced to reduce the feed amount; if the liquid level is too low, the feed pump frequency is increased to increase the feed amount.

[0025] Steam carrying liquid droplets rising stage: The steam generated by flashing carries part of the wastewater droplets upward. As the steam rises, part of the droplets gradually fall back into the flash tank under the action of gravity. However, part of the droplets will continue to rise with the steam and enter the demisting tank 2. In this process, the flow speed and direction of the steam will change, which is affected by the airflow in the flash tank and related to the structure and airflow resistance of the demisting tank 2.

[0026] Demisting tank demisting stage: After the steam carrying droplets enters the demisting tank 2, it first contacts the baffle demister 22. The unique baffle structure of the demister causes the steam flow direction to change multiple times, while the droplets, due to inertia, will impact on the baffle. The impacted droplets gather into larger droplets and slide down the baffle surface to the bottom of the demisting tank under the action of gravity, thereby realizing the separation of steam and droplets. The demisting efficiency of the demister is as high as 95% or more, which can effectively reduce the droplet content in the steam and ensure the purity of the steam entering the heat pump. The backwashing spray head group 23 of the demisting tank 2 will automatically clean at a set time interval or according to the pressure difference before and after the demister. When the demister surface accumulates a lot of impurities, causing the pressure difference before and after to increase, the control system will start the backwashing program. The backwashing spray head group 23 sprays high-pressure water flow to comprehensively clean the demister and remove surface impurities, restoring the demisting performance of the demister.

[0027] Steam enters the heat pump stage: After demisting, the steam is transported to the heat pump 4 through the exhaust steam pipeline 5. The exhaust steam pipeline is insulated with high-efficiency insulation materials to reduce heat loss during transportation, ensuring that the steam enters the heat pump at a high temperature and pressure. Through the operation of the heat pump, the low-grade steam heat energy is converted into high-grade heat energy to meet various heating needs, greatly improving energy utilization.

[0028] The desulfurization slurry after flash evaporation is transported to the desulfurization tower through the liquid discharge pipeline 3 to be sprayed again during the circulation stage of the desulfurization slurry after flash evaporation. In the transportation process, in order to ensure the smooth transportation of the slurry, the liquid discharge pipeline 3 is provided with a certain slope and is equipped with a delivery pump. The delivery pump automatically adjusts the delivery flow according to the liquid level in the desulfurization tower and the process requirements. The desulfurization slurry is fully contacted with the flue gas in the desulfurization tower, absorbs harmful gases such as sulfur dioxide in the flue gas, completes the desulfurization process, and realizes the recycling of the desulfurization slurry.

[0029] System operation monitoring and adjustment stage: During the entire system operation process, the control system will collect the data of the liquid level meter 9, temperature sensor, pressure sensor and other monitoring devices in real time, and comprehensively monitor the system operation state. Once it is found that the system parameters deviate from the set value, the control system will quickly respond, adjust the electric control valve 7, the frequency of the feed pump, the operating parameters of the heat pump and the like, so that the system returns to the normal operation state. The operator can also intuitively understand the operation of the system through the observation lens and the display screen of the control system, discover potential problems in time, and manually intervene and adjust.

[0030] System shutdown stage: When the system needs to be shut down, first stop the wastewater feed pump and cut off the supply of waste heat wastewater. Then, the vacuum pump is turned off, and the pressure in the flash evaporation tank is gradually restored to normal pressure. Then, the heat pump is stopped, and the power of each device is turned off. After the system is shut down, the devices need to be comprehensively checked and maintained, such as cleaning the flash evaporation tank and the demisting tank, checking the sealing performance of the pipeline and the valve, replacing the worn parts, and the like, to prepare for the next start.

[0031] The preferred embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the specific details in the above embodiments, and various equivalent transformations of the technical solutions of the utility model can be made within the technical concept of the utility model, and these equivalent transformations all belong to the protection scope of the utility model.

Claims

1. A high efficiency defroster wastewater heat pump characterized by, The utility model relates to a kind of flash tank and demister system, including: Demister tank (2) is provided with multiple flash tanks (1) below, multiple the top of the flash tank (1) is communicated with demister tank (2), the bottom of multiple the flash tank (1) is communicated by drain line (3), the flash tank (1) is provided with heat pump (4) below, and demister tank (2) is connected with heat pump (4) by exhaust steam line (5).

2. The high-efficiency demisting wastewater heat pump of claim 1, wherein, The demister tank (2) includes: demister tank body (21), the demister tank body (21) is provided with demister (22) in.

3. The high-efficiency demisting wastewater heat pump of claim 2, wherein, The demister (22) is baffle demister.

4. The high efficiency mist elimination wastewater heat pump of claim 2, wherein, The demister tank (2) further includes backwash nozzle group (23) for cleaning the demister (22).

5. The high-efficiency demisting wastewater heat pump of claim 4, wherein, The backwash nozzle group (23) is below or above the demister (22).

6. The high efficiency mist elimination wastewater heat pump of claim 1, wherein, Multiple the flash tank (1) is provided with slurry line (6) on, and the slurry line (6) is provided with electric control valve (7) on.

7. The high efficiency mist elimination wastewater heat pump of claim 1, wherein, It further includes support (8), and the support (8) is used to carry the horizontally arranged demister tank (2) and the flash tank (1).

8. The high efficiency mist elimination wastewater heat pump of claim 1, wherein, The flash tank (1) is provided with liquid level meter (9) on.

9. The high efficiency mist elimination wastewater heat pump of claim 1, wherein, The flash tank (1) is provided with observation lens.

10. The high efficiency mist elimination wastewater heat pump of claim 1, wherein, The flash tank (1) and the demister tank (2) are provided with access hole (10) on, and the access hole (10) is provided with sealing access cover (11).

Images