CN109939516A - Energy-saving device for flue gas condensation and dust removal based on graphene heat exchange tube bundles - Google Patents

Abstract

The invention discloses a flue gas condensation dust removal energy-saving device based on a graphene heat exchange tube bundle, which comprises a heat exchange module, a module support piece for fixing the heat exchange module and a water washing system for washing the heat exchange module, wherein the heat exchange module comprises a cooling water inlet pipe, a cooling water outlet pipe, a cooling water inlet, a cooling water outlet and the graphene heat exchange tube bundle, the water washing system comprises a water washing system header pipe water inlet, a water washing system header pipe, water washing system branch pipes and washing water spray heads, the water washing system header pipe and the graphene heat exchange tube bundle are arranged in parallel, the water washing system branch pipes are arranged in the vertical direction of the water washing system header pipe at equal intervals, and the washing water spray heads are arranged at equal intervals in the water washing system branch pipes extending. The heat exchange module formed by the graphene heat exchange tube bundle can stop smoke in a wavy flow direction, disturb flow, remove dust, dehumidify, demist and whiten the smoke.

Description

Energy-saving device for flue gas condensation and dust removal based on graphene heat exchange tube bundles

technical field

The invention relates to a flue gas condensation dust removal and energy saving device, in particular to a flue gas condensation dust removal energy saving device based on a graphene heat exchange tube bundle, and belongs to the technical field of exhaust gas purification devices.

Background technique

The major power generation equipment manufacturers, power generation groups and environmental protection equipment manufacturers have also taken the initiative to raise new targets for environmental protection emissions from coal-fired thermal power units based on their own survival and development, as well as on the basis of the development trend of coal and power environmental protection industries. Due to the emission level of gas turbines, there is an urgent need to break through existing technologies, obtain new economical and reliable solutions, and meet the strict ultra-clean emission requirements of large thermal power plants. In view of the current situation of air pollution in coal-fired boilers and iron and steel industries, it is imperative to further optimize existing control technologies, develop new multi-effect control technologies, and form an integrated and efficient flue gas purification system with synergistic removal.

In order to achieve the simultaneous ultra-clean emission of PM, SO2 and NOx, various industries such as coal-fired power plants and iron and steel need to start from the comprehensive treatment of flue gas, consider comprehensively, select technical routes reasonably, optimize design indicators and operating parameters, and ensure the overall flue gas purification system. For long-term stable operation, it is necessary to improve the corresponding removal efficiency of desulfurization, denitration, dust removal and energy saving, and to use the interaction between various flue gas purification equipment to reduce energy consumption and material consumption through collaborative emission reduction. effect of net emissions.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a flue gas condensation and dust-removing energy-saving device based on graphene heat exchange tube bundles, which adopts modular design and is easy to operate, manage and maintain. Flue gas, turbulence, and dust removal, dehumidification, defogging, and whitening of the flue gas.

In order to solve the technical problem, the technical solution adopted in the present invention is: a flue gas condensation and dust-removing energy-saving device based on a graphene heat exchange tube bundle, comprising one or more heat exchange modules detachably connected to the heat exchanger shell, A module support for fixing the heat exchange module and a water flushing system for flushing the heat exchange module, the heat exchange module includes a cooling water inlet pipe, a cooling water outlet pipe, a cooling water inlet, a cooling water outlet and a graphene heat exchange tube bundle, The graphene heat exchange tube bundles are suspended perpendicular to the flue gas channel, and there are pore spaces between adjacent graphene heat exchange tube bundles. The water outlet pipes are respectively arranged at the upper and lower ends of the graphene heat exchange tube bundle and communicated with the graphene heat exchange tube bundle; The main pipe of the flushing system is arranged in parallel with the graphene heat exchange tube bundle. The water inlet of the main pipe of the water flushing system is located at the upper end of the main pipe of the water flushing system. The sub-pipes of the water flushing system are arranged at equal intervals in the vertical direction of the main pipe of the water flushing system. Inside the gas block flow heat exchange tube grid, flushing water nozzles are arranged at equal intervals on the branch pipes of the water flushing system extending to the inside of the flue gas block flow heat exchange pipe grid.

Further, the module support includes a top plate, a bottom plate, a support rod connecting the top plate and the bottom plate, one or more support plates are arranged between the top plate and the bottom plate, and a plurality of graphene heat exchange tube bundles are opened on the top plate, the bottom plate and the support plate. Through the hole, the cooling water inlet pipe is arranged on the top plate, and the cooling water outlet pipe is connected to the bottom plate.

Further, the flushing water nozzle adopts a hollow cone nozzle with a jet angle of 120°.

Further, a flue gas flow detection device is also included, and the flue gas flow detection device includes a flue gas flow detection sensor and a control system.

Further, it also includes a water temperature intelligent online monitoring device, and the water temperature intelligent online monitoring device includes a temperature sensor, a smoke flow detection sensor and a control system.

Further, it also includes a cooling water flow measurement and adjustment device, and the cooling water flow measurement and adjustment device includes a water flow detection sensor, a smoke flow detection sensor and a control system.

Further, a sump for collecting flushing water is provided below the heat exchange module.

Beneficial effects of the present invention: The present invention adopts a modular design, which is convenient for equipment repair, maintenance, and disassembly of some components. When other graphene heat exchange modules are in operation, the graphene heat exchange modules that have problems are isolated and carried out separately. Maintenance and replacement, the utilization rate of each component of the device is greatly improved, thereby reducing the impact of the overall shutdown of the flue gas heat exchange device caused by the leakage of individual heat exchange tube bundles. Moreover, the graphene heat exchange tube bundle is light in weight, and the heat exchange module is more convenient to disassemble.

The flue gas condensation and dust-removing energy-saving device based on graphene heat exchange tube bundles in the present invention can improve the defects that traditional flue gas heat exchangers are easily damaged and easy to reduce heat exchange efficiency, and the traditional flue gas heat exchangers are inconvenient to maintain and structurally inconvenient. Reasonable and other technical issues.

The heat exchange tubes in some traditional flue gas heat exchangers use conventional metal tubes or fluoroplastic materials. Although fluoroplastics have the characteristics of high strength, corrosion resistance and toughness, their thermal conductivity is worse than that of metal materials. Fluoroplastic heat exchange tubes are generally flexible and soft, and are easily shaken, deformed, and damaged under the impact of the flue gas duct airflow, and the use function and heat exchange efficiency are also reduced. Compared with conventional metal pipes, its overall heat transfer coefficient is equivalent. Compared to traditional metal heat exchangers, as they require less maintenance, resist chemical corrosion and provide more surface area, they are less prone to sticking and therefore do not require scale inhibitors, eliminating the chemical and labor costs required for water treatment .

Compared with conventional metal tubes, graphene composites are no longer limited by corrosion due to their unique two-dimensional structure and novel properties, such as zero-gap band structure, high electron mobility, and high thermal conductivity, which are important for plastic heat exchangers. Application and manufacturing is a very good opportunity. It can open up new horizons in thermal energy management applications, cooling and thermal energy fields, from low-temperature waste heat utilization, to industrial heat exchange, cooling and cooling of special media, and is a new range of heat recovery ambient temperature control and energy-saving applications. These innovative plastic materials will enable the design of new compact heat exchangers at 50% or less cost, which are corrosion resistant, longer life, better heat radiation than metal, lighter, recyclable and environmentally friendly, Thereby replacing the traditional metals currently used for heat conduction, such as stainless steel, copper, aluminum, titanium alloys and rare metals.

The graphene composite heat exchange tube overcomes the problems of easy scaling, low temperature corrosion and wear that commonly exist in conventional metal heat exchangers under flue gas conditions, so that the waste heat recovery of flue gas is no longer limited by low temperature corrosion, that is to say, It fundamentally solves the problem of low temperature corrosion under flue gas conditions, can operate safely at acid dew point temperature, realizes low temperature heat exchange, absorbs waste heat in flue gas as much as possible, and achieves maximum energy saving effect. At the same time, the influence of scaling on heat conduction can be ignored; compared with metal pipes, it is lighter in weight, lower in specific gravity and lower in cost, and can be easily recycled; it is not afraid of corrosion. All in all, its advantages are: 1. Corrosion resistance; 2. No scaling; 3. High efficiency; 4. Modularity; 5. Easy installation; 6. Long service life; 7. No pollution; 8. Low cost.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is a left-view structural schematic diagram of the present invention;

Fig. 3 is the top view structure schematic diagram of the present invention;

In the picture: 1. Cooling water inlet pipe, 2. Cooling water inlet, 3. Cooling water outlet pipe, 4. Cooling water outlet, 5. Water flushing system main pipe inlet, 6. Graphene heat exchange tube bundle, 7. Module support Parts, 8, water flushing system main pipe, 9, water flushing system branch pipe, 10, flushing water nozzle, 11, top plate, 12, bottom plate, 13, support rod, 14, support plate, 15, heat exchange module.

Detailed ways

The design invention will be further described below with reference to the accompanying drawings and specific embodiments.

Example 1

This embodiment discloses a flue gas condensation and dust-removing energy-saving device based on graphene heat exchange tube bundles, as shown in Figures 1, 2, and 3, comprising one or more heat exchange modules 15, A module support 7 for fixing the heat exchange module 15 and a water flushing system for flushing the heat exchange module 15. The heat exchange module 15 includes a cooling water inlet pipe 1, a cooling water outlet pipe 3, a cooling water inlet 2, and a cooling water outlet 4 and the graphene heat exchange tube bundle 6, the graphene heat exchange tube bundle 6 is made by adding graphene components in the PP raw material, and is vertically suspended in the flue gas channel, and there are pore intervals between adjacent graphene heat exchange tube bundles 6. A plurality of graphene heat exchange tube bundles 6 form a flue gas block flow heat exchange tube grid, and the cooling water inlet tube 1 and the cooling water outlet tube 3 are respectively arranged at the upper and lower ends of the graphene heat exchange tube bundle 6 and are connected with the graphene heat exchange tube bundle 6. The water flushing system includes a water flushing system main pipe inlet 5, a water flushing system main pipe 8, a water flushing system branch pipe 9 and a flushing water nozzle 10. The water flushing system main pipe water inlet 5 is located at the upper end of the water flushing system main pipe 8. The water flushing system The branch pipes 9 are arranged at equal intervals in the vertical direction of the main pipe 8 of the water flushing system, the branch pipes 9 of the water flushing system extend to the inside of the flue gas block flow heat exchange pipe grid, and the flushing water nozzle 10 is extended to the inside of the flue gas block flow heat exchange pipe grid. The water flushing system branch pipes 9 are arranged at equal intervals.

In this embodiment, the module support 7 includes a top plate 11, a bottom plate 12, a support rod 13 connecting the top plate 11 and the bottom plate 12, one or more support plates 14 are arranged between the top plate 11 and the bottom plate 12, the top plate 11, the bottom plate 12, The support plate 114 is provided with a plurality of holes through which the graphene heat exchange tube bundle 6 passes. The cooling water inlet pipe 1 is arranged on the top plate 11 , and the cooling water outlet pipe 3 is connected to the bottom plate 12 . Each heat exchange module 15 is provided with a cooling water inlet pipe 1 and a cooling water outlet pipe 3, and the modules are independent of each other, which is easy to manage and maintain.

In this embodiment, the flushing water nozzle 10 adopts a hollow cone nozzle with a jet angle of 120°, which is a circular jet area, which can produce uniform distribution under a wide range of flow rates and pressures, and can be flushed into the tube bundle to ensure good flushing. Effectiveness and coverage, reducing the influence of nozzle flow and injection pressure.

In order to ensure that the water flushing system can operate normally and automatically switch on and off, the flue gas condensation and dust removal energy-saving device further includes a flue gas flow detection device, and the flue gas flow detection device includes a flue gas flow detection sensor and a control system. When the flue gas flow resistance reaches the set upper limit, the device automatically turns on the water flushing system to clean the heat exchange tube bundle and the droplets and particles in the flue gas. When the flue gas flow resistance reaches the set lower limit, the system automatically shuts down.

In order to ensure that the flue gas condensation and dust-removing energy-saving device based on graphene heat exchange tube bundles can effectively condense enough water to achieve the efficiency of dust removal and fog removal, it also includes an online water temperature monitoring device and a cooling water flow measurement and adjustment device. The intelligent online monitoring device for water temperature includes a temperature sensor, a flue gas flow detection sensor and a control system. The temperature sensor is used to detect the temperature of the cooling water. The cooling water flow measurement and adjustment device includes a water flow detection sensor, a flue gas flow detection sensor and a control system.

In this embodiment, a sump for collecting flushing water is provided below the heat exchange module.

The operation process of the device is as follows: the flue gas condensation and dust-removing energy-saving device based on the graphene heat exchange tube bundle is vertically arranged in the flue gas channel, and cooling water is introduced into the graphene heat exchange tube bundle (the cooling water in the device adopts circulating cooling water, the temperature rises to 4~10°C, and the flue gas temperature decreases by 1~4°C), and the flue gas block flow heat exchange tube grid composed of graphene heat exchange tube bundles intercepts and disturbs the flue gas, causing it to collide violently. There is cooling water in the graphene heat exchange tube bundle. When the water vapor is saturated, the cooling water will cause the water vapor in the flue gas to condense. The droplets wrap the solid particles in the flue gas and adhere to the graphene heat exchange tube bundle, which can not only adhere to the dust and remove scale, but also wash and clean the outer wall of the graphene heat exchange tube bundle. The water film will flow from top to bottom along the outer wall of the graphene heat exchange tube bundle, bringing the adhered solid particles and dust into the water collection tank. The water collecting tank can be connected with the water treatment system, and the washed mortar and condensed water can be collected and filtered, and then sent to the water treatment system as circulating supplementary water, which improves the water saving rate. When the condensed water on the outer wall of the graphene heat exchange tube bundle cannot completely clean the outer surface of the tube, the water flushing system can be turned on to ensure that the heat exchange module is clean. The pressure of the water flushing system reaches 0.7MPa, and it is flushed for 15 seconds to 30 seconds every 4 to 6 hours to ensure the cleanliness of the surface of the flue gas heat exchange tube module.

In this embodiment, the welding process of the support member adopts the injection molding process, and the material is 316L stainless steel.

In order to ensure the minimum flue gas flow resistance to achieve the effects of dust removal, fog removal and heat exchange, the graphene heat exchange tube bundles are suspended along the tube rows perpendicular to the direction of the flue gas.

In the present embodiment, the heat exchange module composed of graphene heat exchange tube bundles can block the flue gas in a wave-like flow direction, and disturb the flow, because graphene is a soft material, as a large amount of flue gas passes through, a wave-like dynamic capital will be generated. With the flow of the flue gas, some of the dust in the flue gas adheres to the wall of the heat exchange tube, and a part falls with the shaking of the graphene heat exchange tube bundle, which enhances the effect of blocking the flue gas and disturbing the flow.

The above descriptions are only the basic principles and preferred embodiments of the present invention. Improvements and replacements made by those skilled in the art according to the present invention belong to the protection scope of the present invention.

Claims (7)

1. a kind of flue gas condensing dedusting energy-saving device based on graphene heat-exchanging tube bundle, it is characterised in that: including one or more The heat exchange module being detachably connected on outer cover of heat exchanger, the module support for fixing heat exchange module and for rinse change The water rinse-system of thermal modules, heat exchange module include that cooling water inlet pipe, cooling water outlet pipe, cooling water inlet, cooling water go out Mouth and graphene heat-exchanging tube bundle, graphene heat-exchanging tube bundle are hung perpendicular to exhaust gases passes, between adjacent graphene heat-exchanging tube bundle There are hole interval, multiple graphene heat-exchanging tube bundles form flue gas choked flow heat exchanger tube grid, cooling water inlet pipe and cooling water water outlet Pipe is separately positioned on graphene heat-exchanging tube bundle upper and lower ends and is connected with graphene heat-exchanging tube bundle；Water rinse-system includes water punching It washes system manifold water inlet, water rinse-system general pipeline, water rinse-system and is in charge of and rinses sprinkler head, water rinse-system general pipeline and stone Black alkene heat-exchanging tube bundle is arranged in parallel, and water rinse-system general pipeline water inlet is located at the upper end of water rinse-system general pipeline, water rinse-system The vertical direction being in charge of in water rinse-system general pipeline is equally spaced, and water rinse-system, which is in charge of, extends to flue gas choked flow heat exchanger tube grid Inside is rinsed sprinkler head and is equally spaced extending to the water rinse-system inside flue gas choked flow heat exchanger tube grid and be in charge of.

2. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: Module support includes top plate and bottom plate, the support rod for connecting top plate and bottom plate, and one piece or muti-piece are equipped between top plate and bottom plate Support plate is provided with multiple holes for passing through graphene heat-exchanging tube bundle in top plate and bottom plate, support plate, and cooling water inlet pipe is set to On top plate, cooling water outlet pipe is connected on bottom plate.

3. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: Rinsing sprinkler head uses spray angle for 120 ° of hollow cone nozzle.

4. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: It further include flue gas flow detection device, flue gas flow detection device includes flue gas flow detection sensor and control system.

5. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: It further include water temperature on-Line Monitor Device, water temperature on-Line Monitor Device includes temperature sensor, flue gas flow detection sensor and control System processed.

6. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: It further include cooling water flow measurement regulating device, it includes water flow detection sensor, flue gas stream that cooling water flow, which measures regulating device, Quantity detection sensor and control system.

7. the flue gas condensing dedusting energy-saving device according to claim 1 based on graphene heat-exchanging tube bundle, it is characterised in that: The lower section of heat exchange module is equipped with the catch basin for collecting flushing water.