CN106091661B - System for coupling and drying slurry-like heat-insulating material by using flue gas waste heat - Google Patents

Abstract

The invention relates to a system for coupling and drying slurry-like thermal insulation materials by utilizing waste heat of flue gas, belonging to the technical field of energy utilization. The dry unit uses the heat of the flue gas to dry the slurry-like thermal insulation material on the thermal equipment. It is also equipped with a pipeline internal flow heating system to feed high-temperature flue gas into the thermal equipment or pipeline to strengthen the slurry-like thermal insulation material. The drying system can not only recycle the heat of the flue gas of the thermal power plant, avoid the waste of heat, but also realize the drying of the slurry insulation material of the thermal equipment and its pipeline by using the heat of the flue gas, which solves the problem of slurry insulation The bottleneck problem in the process of material application and promotion has promoted the improvement of the thermal insulation effect of thermal equipment, and the heat dissipation in thermal equipment and its pipelines has been greatly reduced.

Description

A system for coupling and drying slurry-like thermal insulation materials by utilizing waste heat of flue gas

technical field

The invention belongs to the technical field of energy utilization, and in particular relates to a system for coupling and drying slurry-like thermal insulation materials by using waste heat of flue gas.

Background technique

A thermal power plant is a production unit that produces steam and electricity by burning coal, natural gas, combustible biomass and other fuels. In the process of energy conversion, there will inevitably be heat loss, and the smaller the heat loss of the entire device, the less heat or electricity it produces. The higher the efficiency, the higher the current pressure on energy and the environment, the requirements for energy conversion efficiency and emission indicators of thermal power plants are also increasing.

The heat loss of the thermal power plant mainly comes from two aspects, the heat loss of the flue gas and the heat loss of the thermal equipment pipeline.

First, for the heat loss of flue gas, the current method mainly uses the gradient heat exchange of flue gas to preheat hot water or coal to improve the combustion efficiency of the boiler, but even after a series of comprehensive utilization in the existing technology, the exhausted flue gas The gas temperature is still above 120 degrees Celsius. For units that generate a large amount of smoke for a long time, the heat loss is huge. Taking the current large-scale boiler (above 150 MW single-unit capacity) as an example, its thermal efficiency has reached over 90%, but its exhaust gas temperature is also above 120 degrees Celsius, and the flue gas in this temperature range has not been used much in the original system. value, but it does take away a lot of calories.

In the second aspect, the heat loss of thermal equipment and pipelines in thermal power enterprises is considerable, mainly due to the heat loss from high-temperature thermal equipment and pipelines to the external environment. For a 1000MW thermal power plant, even if it is thermally insulated according to national standards, one day The heat loss is also equivalent to an extra loss of 120 tons of standard coal. If the thermal insulation effect is not good, the heat loss will increase several times. At present, in the industry norms and practical applications, most of the thermal insulation materials commonly used by thermoelectric enterprises are rock wool, aluminum silicate, calcium silicate and other single materials or profiles made of multiple materials, including plates or shells, etc. During construction, the above materials are spliced and fixed on the outer surface of equipment and pipelines to achieve thermal insulation. However, for this kind of material and its use method, there will inevitably be gaps between the thermal insulation material and the outer surface of the thermal insulation body and joints between the profiles of the thermal insulation material, and all these gaps and joints will aggravate the flow of heat due to the thermal bridge effect. Loss, and this thermal bridge loss will increase with the increase of gaps and seams caused by the aging and deformation of thermal insulation profiles caused by the prolongation of use time. In order to reduce the above-mentioned type of thermal bridge loss, paste-like insulation materials that are directly smeared or sprayed on the insulation interface came into being. This type of insulation material is directly attached to the outer surface of equipment and pipelines by smearing or spraying to form a continuous The sealed structure eliminates the thermal bridge effect caused by the above gaps and seams, and saves the support and outer protective layer. It is a high-efficiency, green and energy-saving thermal insulation material, which can reduce more than 60% when used to replace conventional thermal insulation materials heat loss, the energy saving effect is extremely significant. Moreover, this kind of material can last the same life as the pipeline, which solves the problem that the existing conventional thermal insulation materials will be seriously damaged and reduce efficiency after a few years. However, the above-mentioned slurry insulation materials generally require hot construction, that is, when the equipment pipeline is officially put into use, there is a high-temperature working medium in the construction, and the heat emitted by the high-temperature working medium is used to realize the drying and forming of the insulation material. Even if some high-viscosity slurries can be applied cold, their use is extremely limited due to their shortcomings such as too long drying time and not suitable for sub-zero construction. The above-mentioned bottleneck problem in construction and drying and forming has largely restricted the application and promotion of slurry-like thermal insulation materials with excellent performance, and also directly hindered the replacement of thermal equipment and pipeline insulation materials in thermal power enterprises, resulting in the current thermal power enterprises thermal equipment, The pipeline insulation material is old and the heat loss is still relatively serious.

Contents of the invention

The present invention overcomes the disadvantages and deficiencies of the prior art, and provides a system for coupling and drying slurry-like thermal insulation materials by utilizing waste heat of flue gas. It also realizes the pre-quick drying of slurry insulation materials for industrial equipment, and realizes the rapid and convenient application of slurry insulation materials in thermal power enterprises, thereby greatly reducing the heat loss of thermal equipment and greatly improving heat conversion efficiency.

Concrete technical scheme of the present invention is:

A system for coupling and drying slurry-like thermal insulation materials by using the residual heat of flue gas, including a flue gas conveying mechanism and a heat recovery mechanism that communicate with the flue and are connected in sequence. The key point is that the heat recovery mechanism includes a drying unit 1. Dust removal unit and air return unit, the drying unit includes a drying chamber with an entrance door and an exit door on both sides respectively, and the front end of the drying unit is provided with a first air inlet and a second air inlet and a flue gas conveying mechanism The rear end is provided with the first air outlet and the second air outlet connected to the dust removal unit and the return air unit, the internal heating system of the pipeline is arranged between the second air inlet and the second air outlet, and the drying unit is provided with a penetrating inlet There are conveying rails with carrying trolleys at the entrance and exit, and thermal equipment and pipelines for spraying and pouring slurry-like thermal insulation materials are fixed on the load-carrying trolleys, or profile molds for pouring slurry-like thermal insulation materials are fixed.

The pipe internal heating system includes a first movable hollow spherical pipe with a telescopic pipe arranged downstream of the second air inlet, a second movable hollow spherical pipe with a telescopic pipe arranged upstream of the second air outlet, Both the first movable hollow spherical tube and the second movable hollow spherical tube are hemispherical with a hollow channel inside. One side of the spherical tube and the second movable hollow spherical tube is equipped with a position adjustment device, which includes X-direction telescopic cylinders and Y-direction telescopic cylinders perpendicular to each other. The telescopic ends of the X-direction telescopic cylinders and Y-direction telescopic cylinders are connected The corresponding first movable hollow spherical tube or the second movable hollow spherical tube is connected.

The first air inlet, the first air outlet and the drying cavity form an external drying unit for equipment, pipelines or external slurry-like thermal insulation materials of profile moulds.

The dust removal unit includes a dust removal chamber with a dust removal filter inside, the input end of the dust removal chamber is connected to the first air outlet, and the output end is connected to the input end of the return air unit.

The return air unit includes a casing with a fan inside, the input end of the casing is connected to the second air outlet, and the output end is connected to the outside or to the flue.

The flue gas conveying mechanism includes a smoke inlet pipe with a smoke valve connected in sequence, a filter cavity with a smoke filter inside and a flue valve, the smoke inlet pipe is connected with the flue, and the flue valve is arranged at the inlet Downstream of the smoke pipe connection.

The number of the first air inlet and the first air outlet is 1-10.

The number of the second air inlet and the second air outlet is 3-50.

The beneficial effects of the present invention are: the present invention transports the flue gas to the drying unit for drying the slurry-like thermal insulation material, and the drying chamber is provided with a first air inlet and a first air inlet for drying the slurry-like thermal insulation material outside the equipment. The first air outlet is also equipped with a pipe internal flow drying system for indirect heating and drying of the slurry insulation material through the flow of hot air inside the pipe, which can not only recycle the heat of the flue gas, but also be used for heat The drying and molding of slurry-like thermal insulation materials for equipment or pipelines solves the application bottleneck that requires on-site thermal construction for the spraying of slurry-like thermal insulation materials, and can quickly promote the application of slurry-like thermal insulation materials in thermal equipment and pipelines, thereby greatly reducing thermal equipment. 1. The heat is lost during the operation and use of the pipeline, and the overall energy efficiency is significantly improved.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the internal heating system of the pipeline in the present invention.

In the accompanying drawings, 1, the flue, 2, the drying cavity, 201, the entrance door, 202, the exit door, 203, the first air inlet, 204, the first air outlet, 205, the second air inlet, 206, the first air outlet 2. Air outlet, 3. Conveyor track, 301. Carrying trolley, 401. First movable hollow spherical pipe, 402. Telescopic pipe, 403. Second movable hollow spherical pipe, 404. X-direction telescopic cylinder, 405. Y-direction telescopic cylinder Cylinder, 5, dust chamber, 501, dust filter, 6, housing, 601, fan, 7, filter chamber, 701, smoke valve, 702, smoke inlet pipe, 703, smoke filter, 704, flue valve.

Detailed ways

The invention relates to a system for coupling and drying slurry-like thermal insulation materials by using waste heat of flue gas, which includes a flue gas conveying mechanism and a heat recovery mechanism that communicate with a flue 1 and are sequentially connected front and rear, and the heat recovery mechanism includes a drying unit , a dust removal unit and a return air unit, the drying unit includes a drying cavity 2 with an inlet door 201 and an outlet door 202 on both sides, and a first air inlet 203 and a second air inlet 205 are provided at the front end of the drying unit Connected with the flue gas conveying mechanism, the rear end is provided with a first air outlet 204 and a second air outlet 206 connected with the dust removal unit and the return air unit, and a pipeline internal heating system is arranged between the second air inlet 205 and the second air outlet 206 , the drying unit is provided with a conveying track 3 with a carrying trolley 301 that runs through the entrance door 201 and the exit gate 202, and the carrying trolley 301 is fixed with thermal equipment and pipelines for spraying and pouring slurry-like thermal insulation materials, or is fixed with pouring slurry Profile molds for thermal insulation materials.

In a specific embodiment, as shown in Figure 1 and Figure 2, the flue gas in the flue 1 of the thermal power plant is transported to the subsequent heat recovery mechanism through the flue gas delivery mechanism. The smoke pipe 702, the filter cavity 7 with the smoke filter 703 inside and the flue valve 704, the smoke inlet pipe 702 is connected with the flue 1, the flue valve 704 is arranged downstream of the connection of the smoke inlet pipe 702, and passes through the flue The combined effect of valve 704 and smoke valve 701 is to adjust the amount of smoke entering the smoke inlet pipe 702. The smoke enters the filter chamber 7 and is filtered by the smoke filter 703 to absorb and filter particulate matter and harmful gases. 7 The output is relatively pure flue gas with heat.

The internal heating system of the pipe includes a first movable hollow spherical pipe 401 with a telescopic pipe 402 arranged downstream of the second air inlet 205, a second movable hollow spherical pipe 401 with a telescopic pipe 402 arranged upstream of the second air outlet 206 The pipe 403, the first movable hollow spherical pipe 401 and the second movable hollow spherical pipe 403 are all hemispherical with a hollow channel inside, the arc surface of the hemispheric side faces the outside, and the plane side of the hemispherical shape is connected to the telescopic pipe 402 Connected, the first movable hollow spherical pipe 401 and the second movable hollow spherical pipe 403 are provided with position adjustment devices on one side, and the position adjustment devices include mutually perpendicular X-direction telescopic cylinders 404, Y-direction telescopic cylinders 405, and X-direction telescopic cylinders 404. and the telescopic end of the Y-direction telescopic cylinder 405 are connected with the corresponding first movable hollow spherical tube 401 or the second movable hollow spherical pipe 403, through the cooperation of the X-direction telescopic cylinder 404 and the Y-direction telescopic cylinder 405, the second The air inlet 205, the telescopic pipe 402, the first movable hollow spherical pipe 401, the nozzle or pipeline on the equipment, the second movable hollow spherical pipe 403 and the second air outlet 206 are connected to form an internal drying unit of the equipment and pipeline , the high-temperature flue gas does not directly contact the slurry-like insulation material, but achieves the purpose of drying through the heat conduction of equipment and pipelines. The first air inlet 203, the first air outlet 204 and the drying chamber 2 form a paste-like insulation material for equipment and pipelines. The external drying unit is directly in contact with the slurry insulation material to achieve the purpose of drying.

The filtered flue gas enters the drying chamber 2 after passing through the first air inlet 203. At this time, the carrying trolley 301 transports the thermal equipment or pipelines sprayed or poured with slurry-like thermal insulation materials to the drying chamber along the conveying track 3. In body 2, the heat of the flue gas dries the equipment or the slurry insulation material outside the pipeline, and the dried flue gas enters the next process through the first air outlet 204, the first air inlet 203 and the first air outlet 204 All of them are evenly arranged on the end faces of the 4 pieces, and the thermal equipment or the slurry-like thermal insulation material outside the pipeline can be dried more evenly; time, the corresponding X-direction telescopic cylinders and Y-direction telescopic cylinders on both sides pull the first movable hollow spherical pipe 401 and the second movable hollow spherical pipe 403 to move to the carrying trolley 301, finally making the first movable hollow spherical pipe 401 and the second movable hollow spherical pipe 401 The second movable hollow spherical tube 403 respectively connects the input end and output end of the thermal equipment or pipeline on the carrying trolley 301. The heat of the flue gas passes through the inside of the thermal equipment or pipeline, and transfers heat to the external slurry insulation material in the form of heat conduction. For heating and drying, there are 10 second air inlets 205 and second air outlets 206 that are evenly distributed on the end surface.

Among the flue gas passing through the drying chamber 2, the flue gas that directly dries the thermal equipment or the external slurry insulation material of the pipeline through the first air inlet 203 enters from the first air outlet 204 of the drying chamber 2 into the In the dust removal chamber 5 of the filter 501, the flue gas passes through the dust removal filter 501 to filter out dust and impurity particles and then is discharged to the return air unit, while the flue gas that has been heat-conducted and dried inside the thermal equipment or the pipeline enters the return air In the casing 6 with the fan 601 in the unit, the fan 601 performs power traction when the flue gas pressure in the drying system is insufficient. Exhaust to external space.

Based on the form of heat loss in thermal power plants, we propose in this invention an integrated coupling drying system that uses the waste heat of flue gas from thermal power plants to quickly dry the slurry insulation materials of industrial equipment pipelines on the spot, and uses the waste heat of flue gas from thermal power plants to dry thermal equipment pipelines. The slurry heat preservation is dried, and the equipment, valves and pipelines with high-efficiency insulation layer are directly made into equipment, valves and pipelines, which are applied in the process of thermoelectric production and heat transmission, which not only further utilizes the waste heat of the flue gas of the power plant, but also reduces the waste of heat. It also realizes the rapid pre-drying of high-efficiency slurry insulation materials, which solves the bottleneck of the application of this excellent insulation material, and then realizes the rapid and convenient application of slurry insulation materials in thermal power enterprises, thereby greatly reducing the heat loss of thermal equipment. This coupling drying system not only utilizes part of the waste heat of the flue gas, but also can greatly upgrade the existing thermal insulation materials of thermoelectric enterprises by solving the bottleneck of the application of slurry insulation materials, so as to greatly reduce the heat loss of thermal equipment, thereby greatly improving the heat conversion efficiency. , reduce the kilowatt electricity and coal consumption of the system.

After the flue gas in the present invention passes through the drying chamber, the heat is used to dry the slurry insulation material, which reduces the heat loss caused by the exhaust of the flue gas, and saves the high-temperature drying of the thermal equipment and the external insulation material of the pipeline. The finalized procedures and costs solve the impact of thermal construction of slurry-like insulation materials during the operation of equipment and pipelines. Particles and harmful gases in the flue gas are absorbed by the flue gas filter, and the hazards of the flue gas are greatly reduced. At the same time The impact of the chemical gas on the slurry insulation material is minimized, and the characteristics of the insulation material are not damaged. After drying, the flue gas passes through the dust removal function of the dust filter, making it cleaner and avoiding its inclusion of dust and other impurities. The clean air outside produces pollution. Therefore, the present invention can purify the flue gas while utilizing the heat of the flue gas, and plays a positive role in protecting the atmospheric environment.

Claims (6)

1. a kind of carrying out the dry system of coupling using fume afterheat to pulpous state thermal insulation material, including communicate with flue (1) and preceding Sequentially connected flue gas conveying mechanism and heat recovery mechanism afterwards, it is characterised in that：The heat recovery mechanism includes drying Unit, dust removing units and return air unit, the drying unit include that both sides are respectively set into doorway (201) and go out doorway (202) drying cavity (2), drying unit front end is provided with the first air inlet (203) and the second air inlet (205) and flue gas is defeated Mechanism is sent to be connected, rear end is provided with the first air outlet (204) and the second air outlet (206) and dust removing units and return air unit phase Even, it is provided with heating system inside pipeline between the second air inlet (205) and the second air outlet (206), is arranged in drying unit There are the delivery track (3) with carrying trolley (301) for running through into doorway (201) and going out doorway (202), carrying trolley (301) On be fixed with spraying, the heat power equipment for pouring pulpous state thermal insulation material, pipeline, or be fixed with the proximate matter for pouring pulpous state thermal insulation material Mold；

Inside the pipeline heating system include be set to the second air inlet (205) downstream carry flexible pipeline (402) The first activity hollow ball facial canal (401), be set to the with flexible pipeline (402) of the second air outlet (206) upstream Two activity hollow ball facial canals (403), the first activity hollow ball facial canal (401) and the second activity hollow ball facial canal (403) are interior Portion is provided with the hemispherical of hollow channel, hemispheric cambered surface side facing external, hemispheric plane side and telescopic tube Road (402) is connected, and the first activity hollow ball facial canal (401) and second activity hollow ball facial canal (403) side are both provided with position Regulating device, apparatus for adjusting position include orthogonal X to telescoping cylinder (404), Y-direction telescoping cylinder (405), and X is to telescoping cylinder (404) and the telescopic end of Y-direction telescoping cylinder (405) is movable with corresponding first activity hollow ball facial canal (401) or second Hollow ball facial canal (403) is connected；

First air inlet (203) and the first air outlet (204) are 4 of end face where being uniformly arranged on.

2. a kind of system that coupling drying being carried out to pulpous state thermal insulation material using fume afterheat according to claim 1, It is characterized in that：First air inlet (203), the first air outlet (204) and drying cavity (2) formed to equipment, pipeline or The external drying unit of pulpous state thermal insulation material outside section bar mold.

3. a kind of system that coupling drying being carried out to pulpous state thermal insulation material using fume afterheat according to claim 1, It is characterized in that：The dust removing units include the internal dedusting chamber (5) for carrying dust removal filter (501), dedusting chamber (5) input terminal It is connected with the first air outlet (204), output end is connected with return air unit input terminal.

4. a kind of system that coupling drying being carried out to pulpous state thermal insulation material using fume afterheat according to claim 1, It is characterized in that：The return air unit includes the shell (6) for being internally provided with wind turbine (601), and shell (6) input terminal goes out with second Air port (206) is connected, and output end is connected with the external world or is connected with flue (1).

5. a kind of system that coupling drying being carried out to pulpous state thermal insulation material using fume afterheat according to claim 1, It is characterized in that：The flue gas conveying mechanism includes sequentially connected smoke-intake pipe road (702), inside with smoke valve (701) It is provided with the filter chamber (7) and Flue valve (704) of smoke filtration net (703), smoke-intake pipe road (702) are connected with flue (1), cigarette Road valve (704) is set to the downstream of smoke-intake pipe road (702) junction.

6. a kind of system that coupling drying being carried out to pulpous state thermal insulation material using fume afterheat according to claim 1, It is characterized in that：The quantity of second air inlet (205) and the second air outlet (206) is 3-50.