CN110553536B - Laboratory waste gas heat recovery device - Google Patents

Laboratory waste gas heat recovery device Download PDF

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Publication number
CN110553536B
CN110553536B CN201910784746.9A CN201910784746A CN110553536B CN 110553536 B CN110553536 B CN 110553536B CN 201910784746 A CN201910784746 A CN 201910784746A CN 110553536 B CN110553536 B CN 110553536B
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China
Prior art keywords
waste gas
heat exchanger
air
water
laboratory
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CN201910784746.9A
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CN110553536A (en
Inventor
邢希学
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Beijing Dynaflow Experiment Technology Co ltd
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Beijing Dynaflow Experiment Technology Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001Recuperative heat exchangers
    • F28D21/0003Recuperative heat exchangers the heat being recuperated from exhaust gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0057Regenerating the filter material in the filter
    • B01D46/0064Regenerating the filter material in the filter by means of acting on the cake side and moving with respect to the filtering elements
    • B01D46/0065Regenerating the filter material in the filter by means of acting on the cake side and moving with respect to the filtering elements by scrapers, brushes, nozzles or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10Particle separators, e.g. dust precipitators, using filter plates, sheets, or pads having plane surfaces, i.e. axial filtering
    • B01D46/12Particle separators, e.g. dust precipitators, using filter plates, sheets, or pads having plane surfaces, i.e. axial filtering in multiple arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28GCLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G13/00Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00

Abstract

The invention discloses a laboratory waste gas heat recovery device, which comprises an air heat exchanger; the fan is arranged on the left side of the air heat exchanger, and the output end of the fan is communicated with an air inlet on the left side of the air heat exchanger through an exhaust pipe; the water heat exchanger is arranged on the right side of the air heat exchanger, the bottom of the water heat exchanger is communicated with a hot water discharge pipe, and the right side of the water heat exchanger is communicated with a cooling waste gas discharge pipe; the water pump is arranged on the right side of the water heat exchanger, and the output end of the water pump is communicated with a drain pipe; the laboratory waste gas discharge pipe is communicated with the top of the air heat exchanger; the hot air discharge pipe is communicated with the right side of the air heat exchanger; the waste gas output pipe is communicated with the bottom of the air heat exchanger, and one end of the waste gas output pipe, which is far away from the air heat exchanger, is communicated with the left side of the water heat exchanger; the filter screen is arranged inside the exhaust pipe; and the surface cleaning mechanism is arranged on the air heat exchanger and used for cleaning the front surface and the back surface of the air heat exchanger.

Description

Laboratory waste gas heat recovery device
Technical Field
The invention relates to the technical field of energy-saving equipment, in particular to a laboratory waste gas heat recovery device.
Background
With the remarkable improvement of national and world construction levels and the innovative research of products which are different day by day, the research and development of food safety, building material quality detection, environmental product detection, medical pathology experiments, toxicology laboratories, biological safety laboratories and the like, as well as the development and development of more and more experiment centers and larger scale are carried out, the ventilation scale of laboratories is increased, so far, the air treated by air conditioners is directly discharged to the atmosphere, and unfortunately, the potential value of reasonably recovering the huge energy consumption is realized, and the debugging, operation management and analysis of laboratories are carried out for a long time, and a recovery system is excavated.
Purity to heat transfer air among the current laboratory waste gas recovery system in the heat transfer process is not good to accuse, makes the air that has impurity can reduce life to the heat exchanger damage in the morning, and secondly heat transfer equipment does not have the maintenance effect, leads to the surface to adhere to the heat exchange efficiency that has the dust to reduce the heat exchanger.
Disclosure of Invention
The invention aims to provide a laboratory waste gas heat recovery device which has the advantages of high purity of heat exchange air and good maintenance effect of a heat exchanger, and solves the problems that the heat exchange air purity of the existing laboratory waste gas recovery system is not well controlled and heat exchange equipment does not have the maintenance effect.
In order to achieve the purpose, the invention provides the following technical scheme: a laboratory waste gas heat recovery device comprises,
an air heat exchanger;
the fan is arranged on the left side of the air heat exchanger, and the output end of the fan is communicated with an air inlet on the left side of the air heat exchanger through an exhaust pipe;
the water heat exchanger is arranged on the right side of the air heat exchanger, the bottom of the water heat exchanger is communicated with a hot water discharge pipe, and the right side of the water heat exchanger is communicated with a cooling waste gas discharge pipe;
the water pump is arranged on the right side of the water heat exchanger, and the output end of the water pump is communicated with a drain pipe;
the laboratory waste gas discharge pipe is communicated and arranged at the top of the air heat exchanger;
the hot air discharge pipe is communicated with the right side of the air heat exchanger;
the waste gas output pipe is communicated with the bottom of the air heat exchanger, and one end of the waste gas output pipe, which is far away from the air heat exchanger, is communicated with the left side of the water heat exchanger;
the filter screen is arranged inside the exhaust pipe;
and the surface cleaning mechanism is arranged on the air heat exchanger and is used for cleaning the front surface and the back surface of the air heat exchanger.
Preferably, the filter net comprises a filter net body,
the cylinder shell is transversely arranged, and two ends of the cylinder shell are provided with openings;
the net film is arranged at openings at two ends of the cylinder shell;
the outer cleaning device is arranged at the openings at the two ends of the cylinder shell, is used for cleaning one side of the net membrane facing outwards, comprises an air duct ring, is arranged at the opening of the cylinder shell, and the axis of the air duct ring is collinear with the axis of the cylinder shell;
an inner cleaning device arranged in the middle of the cylinder shell and used for cleaning the inward side of the net film, comprising,
a cam arranged at the middle position of the rotating shaft,
the two guide frames are symmetrically and vertically arranged in the center of the rotating shaft and comprise vertical plates, strip holes are arranged on the vertical plates in a penetrating mode, bearing sleeves are arranged in the center of the vertical plates, rolling bearings are arranged in the bearing sleeves, and the rotating shaft penetrates through the rolling bearings;
two second cleaning scraping rods respectively penetrate through strip-shaped holes arranged at the upper end and the lower end of the guide frame,
the second cleaning scraping rod comprises a top plate which is horizontally arranged, an arc-shaped groove is formed in one side, facing the cam, of the top plate, connecting rods are arranged on two sides of the top plate and penetrate through the strip holes, a cross rod is arranged at one end, facing the net film, of each connecting rod, and bristles are arranged on one side, facing the net film, of each cross rod;
and the lower side wall of the cylinder shell is provided with a dust removal hole.
Preferably, the dust removing hole is connected with the dust collector through a pipeline.
Preferably, the upper side wall of the cylinder shell is provided with an air outlet, and the air outlet is provided with a blowing fan.
Preferably, the surface cleaning mechanism comprises a first surface cleaning element,
a fixing frame fixedly arranged at two sides of the front surface and the back surface of the air heat exchanger, a sliding frame is fixedly connected at the inner side of the fixing frame, a fixing plate is fixedly connected at the top part of the right side of the air heat exchanger,
micro motor, set up in the top of fixed plate, micro motor's output shaft passes through shaft coupling fixedly connected with screw rod, the surface cover of screw rod is equipped with the swivel nut, the equal fixedly connected with cleaning plate in front and the back of swivel nut, the inboard fixedly connected with cleaning brush of cleaning plate, the inboard and the surface contact of air heat exchanger of cleaning brush, the left side fixedly connected with and screw rod swing joint's axle sleeve frame at air heat exchanger top.
Preferably, the inner side of the sliding frame is provided with a limiting groove, the groove shape of the limiting groove is trapezoidal, and the outer side of the cleaning plate is fixedly connected with a limiting sliding block in sliding connection with the limiting groove.
Preferably, one end of the cooling waste gas discharge pipe, which is far away from the water heat exchanger, is communicated with air filtering equipment, the other end of the hot air discharge pipe, which is far away from the air heat exchanger, is communicated with the laboratory, and one end of the hot water discharge pipe, which is far away from the water heat exchanger, is communicated with bathing equipment around the laboratory.
Preferably, in order to save energy consumption of the waste gas heat recovery device and accurately control the amount of cold water pumped into a drain pipe (9) by the water pump (4) during waste gas heat recovery, waste gas heat generated in the heat recovery process and waste gas heat absorbed by the cold water need to be obtained;
in the process of calculating the heat quantity of the exhaust gas generated in the heat recovery process, the exhaust gas heat recovery device comprises a temperature and humidity detector, the temperature and humidity detector is placed at an exhaust gas discharge pipe (5) of a laboratory and is used for acquiring the temperature and the humidity of the exhaust gas, and meanwhile, the laboratory also comprises an air density detector which is used for acquiring the density of the exhaust gas in the laboratory;
bringing the temperature detected by the temperature and humidity detector and the density of the laboratory waste gas obtained by the air density detector into a formula I to obtain the waste gas heat generated in the heat recovery process;
Q=Q1*(1.01*(t1-t0)+(2500+1.84*(t1-t0))*w)
q is the waste gas heat generated in the heat recovery process, Q1 is the hot gas mass, T1 is the temperature detected by the temperature and humidity detector, T0 is the preset temperature for heating the cold water introduced into the drain pipe through the waste gas heat recovery device to T0, w is the humidity of the waste gas, a is the air purity introduced into the laboratory waste gas discharge pipe, chi is the air expansion coefficient, rho is the waste gas density of the laboratory, V is the circulation speed of the waste gas introduced into the laboratory waste gas discharge pipe, T is the preset time for introducing the waste gas into the laboratory waste gas discharge pipe, and R is the diameter of the waste gas discharge pipe;
when the waste gas heat absorbed by the cold water is obtained, firstly, the waste gas heat obtained by each liter of cold water in a drain pipe is calculated, in the process, a temperature detector is arranged at the water pump for detecting the temperature of the water in the water pump, and then the waste gas heat obtained by each liter of cold water is calculated by using a formula II;
J=C*(t2-t0)*ρs
formula two
Wherein J is the heat of the waste gas obtained by each liter of cold water, C is the specific heat capacity of water, is a preset value and is 4200J/kg. ℃, t2 is the temperature in the water pump detected by the temperature detector, and rho 2 issIs the density of water;
and finally, accurately controlling the amount of cold water pumped into the drain pipe by the water pump during waste gas heat recovery, and obtaining the amount of cold water pumped into the drain pipe by the water pump by using a formula III in the control process
WhereinK is the amount of cold water finally obtained and pumped into the drain pipe by the water pump, C2The specific heat capacity of the drain pipe is shown, rho g is the density of the drain pipe, Rw is the length of the outer diameter of the drain pipe, Rl is the length of the inner diameter of the drain pipe, and mu is a preset energy efficiency ratio which is generally preset to be 0.8;
the amount of cold water that the water pump let in the drain pipe during accurate control waste gas heat recovery is K, makes waste gas heat recovery in-process power consumption is few.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a filter screen according to the present invention;
FIG. 3 is a schematic view of the structure of the guide frame of the present invention;
FIG. 4 is a schematic view of a second cleaning bar according to the present invention
Fig. 5 is a schematic top view of the air heat exchanger of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, the present invention provides a laboratory exhaust heat recovery apparatus comprising
An air heat exchanger 1;
the fan 2 is arranged on the left side of the air heat exchanger 1, and the output end of the fan 2 is communicated with an air inlet on the left side of the air heat exchanger 1 through an exhaust pipe 6;
the water heat exchanger 3 is arranged on the right side of the air heat exchanger 1, the bottom of the water heat exchanger 3 is communicated with a hot water discharge pipe 10, and the right side of the water heat exchanger 3 is communicated with a cooling waste gas discharge pipe 11;
the water pump 4 is arranged on the right side of the water heat exchanger 3, and the output end of the water pump 4 is communicated with a drain pipe 9;
the laboratory waste gas discharge pipe 5 is communicated with the top of the air heat exchanger 1;
the hot air discharge pipe 7 is communicated with the right side of the air heat exchanger 1;
the waste gas output pipe 8 is communicated with the bottom of the air heat exchanger 1, and one end, far away from the air heat exchanger 1, of the waste gas output pipe 8 is communicated with the left side of the water heat exchanger 3;
a filter screen 13 disposed inside the exhaust duct 6;
and the surface cleaning mechanism 19 is arranged on the air heat exchanger 1 and used for cleaning the front surface and the back surface of the air heat exchanger 1.
In this embodiment, the one end that water heat exchanger 3 was kept away from to cooling exhaust emission pipe 11 is linked together with air filter equipment, and the other end that air heat exchanger 1 was kept away from to hot-blast delivery pipe 7 is linked together in with the laboratory, and this design does not have the injurance through cooling exhaust emission pipe 11 and external air filter equipment's intercommunication messenger laboratory exhaust after, improves the protection of environment, and hot-blast delivery pipe 7 and the laboratory intercommunication can heat the laboratory.
Compared with the prior art, the invention has the following beneficial effects:
according to the laboratory waste gas heat recovery device, the filter screen 13 is arranged in the exhaust pipe 6, so that the service life of the air heat exchanger is prolonged, meanwhile, the surface of the air heat exchanger 1 is cleaned through the surface cleaning mechanism 19, the heat exchange efficiency of the air heat exchanger is improved, the problems that the heat exchange air purity of an existing laboratory waste gas recovery system is poor to control and heat exchange equipment does not have a maintenance effect are solved, the laboratory waste gas heat recovery device has the advantages of high heat exchange air purity and good heat exchanger maintenance effect, and the service life and the heat exchange efficiency of the heat exchanger are prolonged.
As shown in fig. 2-4, in one embodiment,
the filter net 13 is comprised of a net,
the cylinder shell 13-1 is transversely arranged, and two ends of the cylinder shell are provided with openings;
a net film 13-2 arranged at the openings at the two ends of the cylinder shell 13-1;
the outer cleaning device is arranged at openings at two ends of the cylinder shell 13-1 and used for cleaning one outward side of the net membrane 13-2, comprises an air duct ring 13-3 which is arranged at the opening of the cylinder shell 13-1, the axis of the air duct ring is collinear with the axis of the cylinder shell 13-1, an axis sleeve 13-4 is arranged at the axis position of the air duct ring 13-3, the axis sleeve 13-4 is fixedly connected with the inner side wall of the air duct ring 13-3 through a connecting support 13-5, a rotating shaft 13-15 penetrates through two axis sleeves 13-4 arranged at two ends of the cylinder shell 13-1, a first cleaning scraping rod 13-6 is arranged at the position, close to the outer side of the net membrane 13-2, of two ends of the rotating shaft 13-15, a plurality of bristles are arranged at one side, facing the net membrane 13-2, of the first cleaning scraping rod 13-6, two ends of the rotor 13-5 are respectively provided with fan blades 13-7;
an inner cleaning device arranged in the middle of the cylinder shell 13-1 and used for cleaning the inward side of the net membrane 13-2, comprising,
a cam 13-8, wherein the cam 13-8 is arranged at the middle position of the rotating shaft 13-15,
the two guide frames 13-9 are symmetrically and vertically arranged in the center of the rotating shaft 13-15 and comprise vertical plates 13-91, strip holes 13-92 are arranged on the vertical plates 13-91 in a penetrating mode, bearing sleeves 13-93 are arranged at the center positions of the vertical plates 13-91, rolling bearings 13-94 are arranged in the bearing sleeves 13-93, and the rotating shaft 13-15 penetrates through the rolling bearings 13-94;
two second cleaning scraping rods 13-10 respectively penetrate through the elongated holes 13-92 arranged at the upper and lower ends of the guide frame 13-9,
the second cleaning scraping rod 13-10 comprises a top plate 13-101 which is horizontally arranged, an arc-shaped groove 13-102 is formed in one side, facing the cam 13-8, of the top plate 13-101, a connecting rod 13-103 is arranged on two sides of the top plate 13-101, the connecting rod 13-103 penetrates through the long hole 13-92, a cross rod 13-104 is arranged at one end, facing the net film 13-2, of the connecting rod 13-103, bristles are arranged on one side, facing the net film 13-2, of the cross rod 13-104, and the cross rod 13-104 is a telescopic rod;
the lower side wall of the cylinder shell 13-1 is provided with a dust removal hole 13-11.
The dust removing holes 13-11 are connected with the dust collector 13-12 through a pipeline.
The upper side wall of the cylinder shell 13-1 is provided with an air outlet 13-13, and a blowing fan 13-14 is arranged at the air outlet 13-13.
The working principle of the technical scheme is as follows:
air blows out the mouth from 6 air exit pipes, through the wind channel ring, blows the flabellum and drives the pivot rotatory, drives first clearance then and scrapes the pole rotatory, utilizes the brush hair that sets up on the first clearance driving lever to clear up the nethike embrane outside, and the rotation of collimation axle still drives the cam rotation, and the cam drives the roof and is the up-and-down motion, drives the horizontal pole then and is the up-and-down motion, utilizes the brush hair that is provided with on the horizontal pole to clear up the nethike embrane inboard.
The beneficial effects of the above technical scheme are:
1. the filter screen has the effects of self-cleaning and self-maintenance in the use process, the maintenance period of the filter screen is prolonged, and the working efficiency is improved.
2. The dust collector is arranged, so that dust cleaned on the filter screen can be cleaned in time, and the influence on the ventilation effect of the filter screen is avoided.
3. The setting of fan is blown to this embodiment for thereby the dust after the clearance on the filter screen can be as fast as possible the downstream is siphoned away by the dust catcher.
As shown in fig. 5, in one embodiment,
the surface cleaning mechanism 19 comprises a fixed frame 16 fixedly arranged at two sides of the front surface and the back surface of the air heat exchanger 1, a sliding frame 17 is fixedly connected at the inner side of the fixed frame 16, a fixed plate 18 is fixedly connected at the top part of the right side of the air heat exchanger 1,
the cleaning device comprises a micro motor 191 arranged at the top of the fixing plate 18, an output shaft of the micro motor 191 is fixedly connected with a screw 192 through a coupler, a threaded sleeve 193 is sleeved on the surface of the screw 192, cleaning plates 194 are fixedly connected to the front and the back of the threaded sleeve 193, cleaning brushes 195 are fixedly connected to the inner sides of the cleaning plates 194, the inner sides of the cleaning brushes 195 are in contact with the surface of the air heat exchanger 1, and a shaft sleeve frame 196 movably connected with the screw 192 is fixedly connected to the left side of the top of the air heat exchanger 1.
The working principle and the beneficial effects of the technical scheme are as follows:
when the cleaning brush is used, the micro motor 191 can be started regularly to drive the screw 192 to rotate through the output shaft, the screw 192 drives the threaded sleeve 193 to move left and right, the threaded sleeve 193 drives the cleaning plate 194 to move left and right, the cleaning plate 194 drives the cleaning brush 195 to move left and right to brush impurities on the surface of the air heat exchanger 1, the impurities on the surface of the air heat exchanger 1 are prevented from influencing heat exchange efficiency, meanwhile, the shaft sleeve frame 196 can limit the moving position of the screw 192, and the transmission of the screw 192 is enabled to be more stable.
Through the clean clearance of surface 19 with air heat exchanger 1's surface, improve air heat exchanger 1's heat exchange efficiency, solved current laboratory waste gas recovery system's heat transfer air purity and not had the problem of maintenance effect with indirect heating equipment.
As shown in fig. 5, in one embodiment,
the inner side of the sliding frame 17 is provided with a limiting groove 20, the groove shape of the limiting groove 20 is trapezoidal, and the outer side of the cleaning plate 194 is fixedly connected with a limiting slide block 21 which is in sliding connection with the limiting groove 20.
The working principle and the beneficial effects of the technical scheme are as follows:
according to the cleaning device, the inner side of the sliding frame is provided with the limiting groove, the groove type of the limiting groove is in a trapezoidal arrangement, the outer side of the cleaning plate is fixedly connected with the limiting sliding block in sliding connection with the limiting groove, and through the arrangement of the limiting groove and the limiting sliding block, a user can conveniently and stably move the cleaning plate left and right through the sliding connection of the limiting groove and the limiting sliding block, so that the phenomenon of blocking when moving left and right is prevented.
In one embodiment, the end of the hot water discharge pipe 10 remote from the water heat exchanger 3 communicates with bathing equipment around the laboratory. The device can fully utilize heat energy, reduce energy waste and reduce water heating time and water heating power consumption.
In one embodiment of the present invention,
in order to save energy consumption of the waste gas heat recovery device, the amount of cold water pumped into the drain pipe 9 by the water pump 4 during waste gas heat recovery is accurately controlled, and waste gas heat generated in the heat recovery process and waste gas heat absorbed by the cold water are required to be obtained;
in the process of calculating the heat quantity of the exhaust gas generated in the heat recovery process, the exhaust gas heat recovery device comprises a temperature and humidity detector, the temperature and humidity detector is placed at an exhaust gas discharge pipe 5 of a laboratory and is used for acquiring the temperature and the humidity of the exhaust gas, and meanwhile, the laboratory also comprises an air density detector which is used for acquiring the density of the exhaust gas in the laboratory;
bringing the temperature detected by the temperature and humidity detector and the density of the laboratory waste gas obtained by the air density detector into a formula I to obtain the waste gas heat generated in the heat recovery process;
Q=Q1*(1.01*(t1-t0)+(2500+1.84*(t1-t0))*w)
wherein Q is the waste gas heat generated in the heat recovery process, Q1 is the hot gas mass, T1 is the temperature detected by the temperature and humidity detector, T0 is the preset temperature at which the cold water introduced into the drain pipe 9 is heated by the waste gas heat recovery device to T0, w is the humidity of the waste gas, a is the air purity of the waste gas introduced into the laboratory discharge pipe 5, χ is the air expansion coefficient, ρ is the waste gas density of the laboratory, V is the flow velocity of the waste gas introduced into the laboratory discharge pipe 5, T is the preset time for introducing the waste gas into the laboratory discharge pipe 5, and R is the diameter of the waste gas discharge pipe 5;
the exhaust heat recovered by the exhaust heat recovery device can be obtained by using the formula I.
When the exhaust gas heat absorbed by the cold water is obtained, firstly, the exhaust gas heat obtained by each liter of cold water in a drain pipe 9 is calculated, in the process, a temperature detector is arranged at the water pump 4 for detecting the temperature of the water in the water pump, and then the exhaust gas heat obtained by each liter of cold water is calculated by using a formula II;
J=C*(t2-t0)*ρs
formula two
Wherein J is the heat of the waste gas obtained by each liter of cold water, C is the specific heat capacity of water, is a preset value and is 4200J/kg. ℃, t2 is the temperature in the water pump detected by the temperature detector, and rho 2 issIs the density of water;
the water in the water pump can be obtained by using a second formula, and the heat of the waste gas required by heating each liter of water to the preset temperature is the same as that of the waste gas.
And finally, accurately controlling the amount of cold water pumped into the drain pipe 9 by the water pump 4 during waste gas heat recovery, and obtaining the amount of cold water pumped into the drain pipe 9 by the water pump 4 by using a formula III in the control process
Wherein K is the amount of cold water which is finally obtained and is pumped into the drain pipe 9 by the water pump 4, C2The specific heat capacity of the drain pipe 9 is shown, rho g is the density of the drain pipe 9, Rw is the length of the outer diameter of the drain pipe, Rl is the length of the inner diameter of the drain pipe, and mu is a preset energy efficiency ratio which is generally preset to be 0.8;
the amount of cold water that the water pump 4 let in the drain pipe 9 during accurate control waste gas heat recovery is K for the waste gas heat recovery in-process power consumption is few.
The beneficial effects of the technology are as follows:
1. the heat of the recovered hot gas in the waste gas heat recovery process can be accurately known in the process;
2. the required heat can be accurately known in the process, so that the cold water quantity can be conveniently controlled;
3. in the process, the purity of air is considered, so that the heat in the waste gas is closer to the actual heat;
4. the process takes into account the heat loss in the inlet pipe during the heat recovery process.
5. The process is according to the heat in the waste gas, accurate control the volume of cold water makes the in-process can not only let the cold water temperature promote to required temperature, and in-process, the water resource has been practiced thrift to the not excessive cold water that lets in, and the power consumption of in-process has obtained fine control.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a laboratory waste gas heat recovery device which characterized in that: comprises that
An air heat exchanger (1);
the fan (2) is arranged on the left side of the air heat exchanger (1), and the output end of the fan (2) is communicated with an air inlet on the left side of the air heat exchanger (1) through an exhaust pipe (6);
the water heat exchanger (3) is arranged on the right side of the air heat exchanger (1), the bottom of the water heat exchanger (3) is communicated with a hot water discharge pipe (10), and the right side of the water heat exchanger (3) is communicated with a cooling waste gas discharge pipe (11);
the water pump (4) is arranged on the right side of the water heat exchanger (3), and the output end of the water pump (4) is communicated with a drain pipe (9);
the laboratory waste gas discharge pipe (5) is communicated and arranged at the top of the air heat exchanger (1);
the hot air discharge pipe (7) is communicated with the right side of the air heat exchanger (1);
the waste gas output pipe (8) is communicated with the bottom of the air heat exchanger (1), and one end, far away from the air heat exchanger (1), of the waste gas output pipe (8) is communicated with the left side of the water heat exchanger (3);
a filter screen (13) arranged inside the exhaust duct (6);
the surface cleaning mechanism (19) is arranged on the air heat exchanger (1) and used for cleaning the front surface and the back surface of the air heat exchanger (1);
the filter screen (13) comprises a filter screen,
the cylinder shell (13-1) is transversely arranged, and two ends of the cylinder shell are provided with openings;
the net film (13-2) is arranged at openings at two ends of the cylinder shell (13-1);
the outer cleaning device is arranged at the opening parts at the two ends of the cylinder shell (13-1) and used for cleaning one side of the net film (13-2) facing outwards, comprises an air channel ring (13-3) and is arranged at the opening part of the cylinder shell (13-1), the axis of the outer cleaning device is collinear with the axis of the cylinder shell (13-1), an axis sleeve (13-4) is arranged at the axis position of the air channel ring (13-3), the axis sleeve (13-4) is fixedly connected with the inner side wall of the air channel ring (13-3) through a connecting support (13-5), a rotating shaft (13-15) penetrates through the two axis sleeves (13-4) arranged at the two ends of the cylinder shell (13-1), and first cleaning scraping rods (13-6) are arranged at the positions, close to the outer side of the net film (13-2), at the two ends of the rotating shaft (13-15), a plurality of bristles are arranged on one side, facing the net membrane (13-2), of the first cleaning scraping rod (13-6), and fan blades (13-7) are arranged at two end parts of the rotating shaft (13-15) respectively;
an inner cleaning device which is arranged in the middle of the cylinder shell (13-1) and is used for cleaning the inward side of the net film (13-2) and comprises,
a cam (13-8), wherein the cam (13-8) is arranged at the middle position of the rotating shaft (13-15),
the two guide frames (13-9) are symmetrically and vertically arranged in the center of the rotating shaft (13-15) and comprise vertical plates (13-91), strip holes (13-92) are arranged on the vertical plates (13-91) in a penetrating mode, bearing sleeves (13-93) are arranged at the center positions of the vertical plates (13-91), rolling bearings (13-94) are arranged in the bearing sleeves (13-93), and the rotating shaft (13-15) penetrates through the rolling bearings (13-94);
two second cleaning scraping rods (13-10) respectively penetrate through the elongated holes (13-92) arranged at the upper end and the lower end of the guide frame (13-9),
the second cleaning scraping rod (13-10) comprises a top plate (13-101) which is horizontally arranged, an arc-shaped groove (13-102) is formed in one side, facing the cam (13-8), of the top plate (13-101), connecting rods (13-103) are arranged on two sides of the top plate (13-101), the connecting rods (13-103) penetrate through the strip-shaped holes (13-92), cross rods (13-104) are arranged at one ends, facing the net film (13-2), of the connecting rods (13-103), and bristles are arranged on one sides, facing the net film (13-2), of the cross rods (13-104);
the lower side wall of the cylinder shell (13-1) is provided with a dust removal hole (13-11).
2. The laboratory exhaust heat recovery device according to claim 1, wherein: the dust removal holes (13-11) are connected with a dust collector (13-12) through a pipeline.
3. The laboratory exhaust heat recovery device according to claim 1, wherein: the upper side wall of the cylinder shell (13-1) is provided with an air outlet (13-13), and the air outlet (13-13) is provided with a blowing fan (13-14).
4. The laboratory exhaust heat recovery device according to claim 1, wherein: the surface cleaning means (19) comprises,
a fixed frame (16) which is fixedly arranged at two sides of the front surface and the back surface of the air heat exchanger (1), a sliding frame (17) is fixedly connected at the inner side of the fixed frame (16), a fixed plate (18) is fixedly connected at the top part of the right side of the air heat exchanger (1),
micro motor (191), set up in the top of fixed plate (18), the output shaft of micro motor (191) passes through shaft coupling fixedly connected with screw rod (192), the surface cover of screw rod (192) is equipped with swivel nut (193), the equal fixedly connected with cleaning plate (194) in front and the back of swivel nut (193), the inboard fixedly connected with cleaning brush (195) of cleaning plate (194), the inboard of cleaning brush (195) and the surface contact of air heat exchanger (1), the left side fixedly connected with at air heat exchanger (1) top and screw rod (192) swing joint's axle sleeve frame (196).
5. The laboratory exhaust heat recovery device according to claim 4, wherein: the inner side of the sliding frame (17) is provided with a limiting groove (20), the groove shape of the limiting groove (20) is in a trapezoidal arrangement, and the outer side of the cleaning plate (194) is fixedly connected with a limiting sliding block (21) which is in sliding connection with the limiting groove (20).
6. The laboratory exhaust heat recovery device according to claim 1, wherein: one end, far away from the water heat exchanger (3), of the cooling waste gas discharge pipe (11) is communicated with air filtering equipment, the other end, far away from the air heat exchanger (1), of the hot air discharge pipe (7) is communicated with a laboratory, and one end, far away from the water heat exchanger (3), of the hot water discharge pipe (10) is communicated with bathing equipment around the laboratory.
7. The laboratory exhaust heat recovery device according to claim 1, wherein: in order to save the energy consumption of the waste gas heat recovery device, the amount of cold water pumped into a drain pipe (9) by the water pump (4) during waste gas heat recovery is accurately controlled, and waste gas heat generated in the heat recovery process and waste gas heat absorbed by the cold water are required to be obtained;
in the process of calculating the heat quantity of the exhaust gas generated in the heat recovery process, the exhaust gas heat recovery device comprises a temperature and humidity detector, the temperature and humidity detector is placed at an exhaust gas discharge pipe (5) of a laboratory and is used for acquiring the temperature and the humidity of the exhaust gas, and meanwhile, the laboratory also comprises an air density detector which is used for acquiring the density of the exhaust gas in the laboratory;
bringing the temperature detected by the temperature and humidity detector and the density of the laboratory waste gas obtained by the air density detector into a formula I to obtain the waste gas heat generated in the heat recovery process;
Q=Q1*(1.01*(t1-t0)+(2500+1.84*(t1-t0))*w)
q is the waste gas heat generated in the heat recovery process, Q1 is the hot gas mass, T1 is the temperature detected by the temperature and humidity detector, T0 is the preset temperature detected by the waste gas heat recovery device for heating the cold water introduced into the drain pipe (9) to T0, w is the humidity of the waste gas, a is the air purity introduced into the laboratory waste gas discharge pipe (5), chi is the air expansion coefficient, rho is the waste gas density of the laboratory, V is the circulation speed of the waste gas introduced into the laboratory waste gas discharge pipe (5), T is the preset time for introducing the waste gas into the laboratory waste gas discharge pipe (5), and R is the diameter of the waste gas discharge pipe (5);
when the waste gas heat absorbed by the cold water is obtained, firstly, the waste gas heat obtained by each liter of cold water in a drain pipe (9) is calculated, in the process, a temperature detector is arranged at the water pump (4) for detecting the temperature of the water in the water pump, and then the waste gas heat obtained by each liter of cold water is calculated by using a formula II;
J=C*(t2-t0)*ρs
formula two
Wherein J is the heat of the waste gas obtained by each liter of cold water, C is the specific heat capacity of water, is a preset value and is 4200J/kg. ℃, t2 is the temperature in the water pump detected by the temperature detector, and rho 2 issIs the density of water;
and finally, accurately controlling the amount of cold water pumped into the drain pipe (9) by the water pump (4) during waste gas heat recovery, and obtaining the amount of cold water pumped into the drain pipe (9) by the water pump (4) by using a formula III in the control process
Wherein K is finally obtained, the water pump (4) is led into a drain pipe(9) The amount of cold water in the water pipe C2 is the specific heat capacity of the water discharge pipe 9, pgThe density of the drain pipe (9) is shown, Rw is the length of the outer diameter of the drain pipe, Rl is the length of the inner diameter of the drain pipe, and mu is a preset energy efficiency ratio which is generally preset to be 0.8;
the amount of cold water pumped into the drain pipe (9) by the water pump (4) is K during the waste gas heat recovery, so that the energy consumption in the waste gas heat recovery process is low.
CN201910784746.9A 2019-08-23 2019-08-23 Laboratory waste gas heat recovery device Active CN110553536B (en)

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US4406402A (en) * 1981-04-28 1983-09-27 Joseph Henriques Flue heat recovery system
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CN201795471U (en) * 2010-07-19 2011-04-13 中国电力工程顾问集团华东电力设计院 Flue gas afterheat utilization system
CN102313291A (en) * 2010-06-30 2012-01-11 中国电力工程顾问集团华东电力设计院 Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant
CN205014330U (en) * 2015-07-31 2016-02-03 辽宁赛沃斯能效科技股份有限公司 Modular economizer residual heat from flue gas device and residual heat from flue gas system
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CN207471752U (en) * 2017-08-28 2018-06-08 广州泛美实验室系统科技股份有限公司 A kind of laboratory exhaust gas heat recovery system
CN207483867U (en) * 2017-11-27 2018-06-12 山东豪门铝业有限公司 A kind of alumina electrolysis bath waste-heat recovery device
CN208332481U (en) * 2018-05-24 2019-01-04 戚雨萱 A kind of air-conditioning with automatic dedusting function
CN208918770U (en) * 2018-05-19 2019-05-31 山东晟瑞新材料有限公司 One kind can dust-proof dust-removing formula air compressor machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406402A (en) * 1981-04-28 1983-09-27 Joseph Henriques Flue heat recovery system
CN201281441Y (en) * 2008-08-28 2009-07-29 宁波奥克斯空调有限公司 Dust removing mechanism for indoor set of air conditioner
CN102313291A (en) * 2010-06-30 2012-01-11 中国电力工程顾问集团华东电力设计院 Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant
CN201795471U (en) * 2010-07-19 2011-04-13 中国电力工程顾问集团华东电力设计院 Flue gas afterheat utilization system
CN205014330U (en) * 2015-07-31 2016-02-03 辽宁赛沃斯能效科技股份有限公司 Modular economizer residual heat from flue gas device and residual heat from flue gas system
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CN207471752U (en) * 2017-08-28 2018-06-08 广州泛美实验室系统科技股份有限公司 A kind of laboratory exhaust gas heat recovery system
CN207483867U (en) * 2017-11-27 2018-06-12 山东豪门铝业有限公司 A kind of alumina electrolysis bath waste-heat recovery device
CN208918770U (en) * 2018-05-19 2019-05-31 山东晟瑞新材料有限公司 One kind can dust-proof dust-removing formula air compressor machine
CN208332481U (en) * 2018-05-24 2019-01-04 戚雨萱 A kind of air-conditioning with automatic dedusting function

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