CN111895831A - a heat exchange device - Google Patents

Abstract

The invention relates to the field of ceramic production, and provides a heat exchange device for solving the problem of recycling heat in flue gas. A heat exchange device provided by the present invention includes: a cold source, the cold source includes a first box body and a blower, the first box body communicates with the blower; a heat exchanger, the heat exchanger includes a first box body and a blower. Two boxes, a heat pipe and an induced draft fan, the heat pipe is arranged in the second box, the induced draft fan is connected to the second box, the second box is connected to the smoke pipe; the second box is connected to the The first box is connected, the heat pipe includes a vaporization section and a liquefaction section, and the liquefaction section is arranged at the connection between the first box and the second box. The heat in the flue gas is fully utilized, and the pollutants in the flue gas are not introduced into the cold source, which improves the energy utilization efficiency and saves the consumption of water and gas in the ceramic production process.

Description

a heat exchange device

technical field

The invention relates to the field of ceramic production, in particular to a heat exchange device.

Background technique

At present, with the country's higher and higher requirements for environmental protection, most fuel flue gas is installed with a flue gas desulfurization system before being discharged. Among the flue gas desulfurization systems used in China, due to the mature wet desulfurization technology and high desulfurization efficiency, most of the flue gas desulfurization systems are used. Wet desulfurization used. However, in order to ensure the desulfurization effect of the flue gas, the pre-desulfurized flue gas must be cooled before entering the desulfurization tower. The traditional method only considers the flue gas desulfurization, and does not make reasonable use of the heat carried by the flue gas.

The temperature of the flue gas generated in the kiln for ceramic tile production can reach more than 400 degrees Celsius, and the energy is very high. The utilization rate of the existing technology is low, and the energy in the flue gas cannot be fully utilized.

SUMMARY OF THE INVENTION

The technical problem solved by the invention is the problem of recycling and utilization of heat in flue gas, and a heat exchange device is provided.

In order to solve the above-mentioned technical problems, the technical scheme provided by the present invention is:

A heat exchange device, comprising:

a cold source, the cold source includes a first box body and a blower, and the first box body communicates with the blower;

A heat exchanger, the heat exchanger includes a second box body, a heat pipe and an induced draft fan, the heat pipe is arranged in the second box body, the induced draft fan is connected to the second box body, and the second box body is connected to the second box body. smoke pipe connection;

The second box is connected to the first box, the heat pipe includes a vaporization section and a liquefaction section, and the liquefaction section is arranged at the connection between the first box and the second box.

Part of the heat generated by the flue gas in the ceramic production process is absorbed by the heat exchanger and then transferred to the cold source, and the air in the cold source can be used for ceramic production after being heated.

The heat in the flue gas is fully utilized, and the pollutants in the flue gas are not introduced into the cold source, which improves the energy utilization efficiency and saves the consumption of water and gas in the ceramic production process.

Preferably, there is not less than one heat pipe, and the vaporization section of the heat pipe is distributed in the second box.

Preferably, the flow rate of the flue gas in the smoke pipe is 15000~25000Nm3/h, and the temperature of the flue gas is 350~450°C.

Preferably, the flow rate of the air in the first box is 15000~20000Nm3/h, and the temperature of the air is 25~35°C.

Preferably, the blower is electrically connected with the induced draft fan, and after the blower is stopped, the induced draft fan also needs to be stopped.

Preferably, the air inlet of the first box is connected to the blower, and the air outlet of the first box is provided with a temperature sensor and a pressure sensor.

Preferably, a pressure sensor is arranged in the smoke pipe, and a temperature sensor is arranged in the heat pipe.

Preferably, the cigarette pipe is connected with a tee, and the tee includes a smoke inlet, a first branch port and a second branch port, the smoke inlet is connected with the smoke pipe, and the first branch port is the same as the smoke pipe. the second box is connected, and the second split port is connected with the butterfly valve;

The opening degree of the butterfly valve is 50-80%.

Preferably, an inspection port is provided on the second box body.

Preferably, an ash hopper is provided on the second box body.

Preferably, the heat pipe is coated with a self-cleaning coating.

Preferably, the self-cleaning coating is formed by applying a self-cleaning coating to the heat pipe; the preparation method of the self-cleaning coating is:

Take 20-25 parts by mass of polytetrafluoroethylene resin, 5-10 parts by mass of polyethersulfone resin, 5-10 parts by mass of modified nano-silicon dioxide, 5-10 parts by mass of modified nano-titanium dioxide, and 0.5-1 part by mass of dispersant parts, 0.5-1 part by mass of defoamer, 0.5-1 part by mass of leveling agent, and 100-120 parts by mass of xylene;

Add polyethersulfone resin into xylene, heat and stir to dissolve evenly, add modified nano-silicon dioxide, modified nano-titanium dioxide, defoaming agent, leveling agent, dispersing agent, as for ball milling in a ball mill for 36 hours, the slurry obtained by ball milling The material and polytetrafluoroethylene resin powder are stirred and mixed evenly, and sieved to obtain a self-cleaning coating.

Preferably, the preparation method of the modified nano-silica is as follows: mixing a saturated solution of water glass and a saturated solution of sodium bicarbonate in a volume ratio of 1:1, heating to 90 degrees Celsius, and fully stirring for 1 hour to obtain a silica sol , adding silver nitrate solution to carry out ion exchange reaction, washing and drying after the reaction is completed to obtain modified nano-silica.

Preferably, the preparation method of the modified nano titanium dioxide:

Take 10-15 parts by mass of lignin cyclic acid salt, 2-4 parts by mass of alkyl trimethyl ammonium bromide, 10-20 parts by mass of butyl titanate, and 100-200 parts by mass of ethanol;

The lignosulfonate and the alkyl trimethyl ammonium bromide are respectively configured into a 2g/L solution, mixed evenly, the precipitate is separated, and dried to obtain the first product;

Mix butyl titanate and ethanol, add the first product, stir evenly, slowly add dropwise to water with a pH of 5, the amount of water is 3 times the volume of ethanol, stir for 40 min, centrifuge and wash the mixture, and put it at 80 After drying at degrees Celsius for 4 hours, the obtained solid was ground and calcined at 500 degrees Celsius for 2 hours in a nitrogen atmosphere, and cooled to room temperature to obtain modified nano-titanium dioxide.

Compared with the prior art, the present invention has the beneficial effects of fully utilizing the heat in the flue gas, without introducing the pollutants in the flue gas into the cold source, improving the energy utilization efficiency and saving the time in the ceramic production process. The amount of water and gas.

The air in the cold source can be heated to more than 200 degrees Celsius, which meets the needs of the ceramic production process and greatly saves energy.

Description of drawings

FIG. 1 is a schematic diagram of a heat exchange device.

Detailed ways

The following examples are to further illustrate the present invention, but not to limit the present invention.

Example 1

A heat exchange device, comprising:

Cold source 1, the cold source 1 includes a first box 11 and a blower 12, and the first box 11 communicates with the blower 12;

Heat exchanger 2. The heat exchanger 2 includes a second box body 21, a heat pipe 23, and an induced draft fan 22. The heat pipe 23 is arranged in the second box body 21, and the induced draft fan 22 is the same as the second box body. 21 is connected, the second box 21 is connected with the cigarette pipe 3;

The second box 21 is connected to the first box 11 , the heat pipe 23 includes a vaporization section and a liquefaction section, and the liquefaction section is arranged between the first box 11 and the second box 21 . Junction. The heat pipe 23 is not less than one, and the vaporization section of the heat pipe 23 is distributed in the second box body 21 . The flow rate of the flue gas in the smoke pipe 3 is 15000-25000Nm ³ /h, and the temperature of the flue gas is 350-450°C. The flow rate of the air in the first box body 11 is 15000~20000Nm ³ /h, and the temperature of the air is 25~35°C. The blower 12 is electrically connected to the induced draft fan 22. After the blower 12 is stopped, the induced draft fan 22 also needs to be stopped. The air inlet of the first box 11 is connected to the blower 12 , and the air outlet of the first box 11 is provided with a temperature sensor 13 and a pressure sensor 14 . A pressure sensor 33 is arranged in the smoke pipe, and a temperature sensor is arranged in the heat pipe. The smoke pipe 3 includes a conveying pipe 31 and a tee 32. The conveying pipe 31 is connected to the tee 32. The smoke inlet 321 is connected with the conveying pipe 31, the first branch port 322 is connected with the second box body 21, and the second branch port 323 is connected with the butterfly valve 324;

The opening degree of the butterfly valve 324 is 50-80%. An inspection port is provided on the second box body 21 .

Part of the heat generated by the flue gas in the ceramic production process is absorbed by the heat exchanger and then transferred to the cold source, and the air in the cold source can be used for ceramic production after being heated. The heat in the flue gas is fully utilized, and the pollutants in the flue gas are not introduced into the cold source, which improves the energy utilization efficiency and saves the consumption of water and gas in the ceramic production process.

Example 2

A heat exchange device, comprising:

Cold source 1, the cold source 1 includes a first box 11 and a blower 12, and the first box 11 communicates with the blower 12;

Heat exchanger 2. The heat exchanger 2 includes a second box body 21, a heat pipe 23, and an induced draft fan 22. The heat pipe 23 is arranged in the second box body 21, and the induced draft fan 22 is the same as the second box body. 21 is connected, the second box 21 is connected with the cigarette pipe 3;

The second box 21 is connected to the first box 11 , the heat pipe 23 includes a vaporization section and a liquefaction section, and the vaporization section is distributed in the second box 21 . The heat pipe 23 is not less than one, and the liquefaction section of the heat pipe 23 passes through the tank walls of the first tank 11 and the second tank 12 and enters the first tank 11 . The flow rate of the flue gas in the smoke pipe 3 is 15000-25000Nm ³ /h, and the temperature of the flue gas is 350-450°C. The flow rate of the air in the first box body 11 is 15000~20000Nm ³ /h, and the temperature of the air is 25~35°C. The blower 12 is electrically connected to the induced draft fan 22. After the blower 12 is stopped, the induced draft fan 22 also needs to be stopped. The air inlet of the first box 11 is connected to the blower 12 , and the air outlet of the first box 11 is provided with a temperature sensor 13 and a pressure sensor 14 . A pressure sensor 33 is arranged in the smoke pipe, and a temperature sensor is arranged in the heat pipe. The smoke pipe 3 includes a conveying pipe 31 and a tee 32. The conveying pipe 31 is connected to the tee 32. The smoke inlet 321 is connected with the conveying pipe 31, the first branch port 322 is connected with the second box body 21, and the second branch port 323 is connected with the butterfly valve 324;

The opening degree of the butterfly valve 324 is 50-80%. An inspection port is provided on the second box body 21 .

Example 3

The difference between Example 3 and Example 1 is that the heat pipe is coated with a self-cleaning coating, and the self-cleaning coating is formed by applying the self-cleaning coating to the heat pipe; the preparation method of the self-cleaning coating is as follows. :

Take 22Kg of polytetrafluoroethylene resin, 6Kg of polyethersulfone resin, 7 parts of modified nano-silica, 6Kg of modified nano-titanium dioxide, 0.6Kg of dispersant, 0.7Kg of defoamer, 0.7Kg of leveling agent, and 110Kg of xylene ;

Add polyethersulfone resin into xylene, heat and stir to dissolve evenly, add modified nano-silicon dioxide, modified nano-titanium dioxide, defoaming agent, leveling agent, dispersing agent, as for ball milling in a ball mill for 36 hours, the slurry obtained by ball milling The material and polytetrafluoroethylene resin powder are stirred and mixed evenly, and sieved to obtain a self-cleaning coating.

The preparation method of the modified nano-silica is as follows: mixing a saturated solution of water glass and a saturated solution of sodium bicarbonate in a volume ratio of 1:1, heating to 90 degrees Celsius, fully stirring for 1 hour to obtain silica sol, adding nitric acid The silver solution is subjected to ion exchange reaction, and after the reaction is completed, it is washed and dried to obtain modified nano-silica.

The preparation method of described modified nano titanium dioxide:

Take lignin cyclate 6Kg, alkyl trimethylammonium bromide 1.5Kg, butyl titanate 6Kg, ethanol 50Kg;

The lignosulfonate and the alkyl trimethyl ammonium bromide are respectively configured into a 2g/L solution, mixed evenly, the precipitate is separated, and dried to obtain the first product;

Mix butyl titanate and ethanol, add the first product, stir evenly, slowly drop into water with a pH of 5, the amount of water is 3 times the volume of ethanol, stir for 40 min, centrifuge and wash the mixture, and put it at 80 After drying at degrees Celsius for 4 hours, the obtained solid was ground and calcined at 500 degrees Celsius for 2 hours in a nitrogen atmosphere, and cooled to room temperature to obtain modified nano-titanium dioxide.

Example 4

The difference between Example 4 and Example 2 is that the heat pipe is coated with a self-cleaning coating, and the self-cleaning coating is formed by applying the self-cleaning coating to the heat pipe; the preparation method of the self-cleaning coating is as follows. :

Take 11Kg of polytetrafluoroethylene resin, 3Kg of polyethersulfone resin, 3.5 parts of modified nano-silica, 3Kg of modified nano-titanium dioxide, 0.3Kg of dispersant, 0.35Kg of defoamer, 0.35Kg of leveling agent, and 55Kg of xylene ;

Add polyethersulfone resin into xylene, heat and stir to dissolve evenly, add modified nano-silicon dioxide, modified nano-titanium dioxide, defoaming agent, leveling agent, dispersing agent, as for ball milling in a ball mill for 36 hours, the slurry obtained by ball milling The material and polytetrafluoroethylene resin powder are stirred and mixed evenly, and sieved to obtain a self-cleaning coating.

The preparation method of the modified nano-silica is as follows: mixing a saturated solution of water glass and a saturated solution of sodium bicarbonate in a volume ratio of 1:1, heating to 90 degrees Celsius, fully stirring for 1 hour to obtain silica sol, adding nitric acid The silver solution is subjected to ion exchange reaction, and after the reaction is completed, it is washed and dried to obtain modified nano-silica.

The preparation method of described modified nano titanium dioxide:

Take 3Kg of lignin cyclic salt, 0.75Kg of alkyl trimethyl ammonium bromide, 3Kg of butyl titanate, and 25Kg of ethanol;

The lignosulfonate and the alkyl trimethyl ammonium bromide are respectively configured into a 2g/L solution, mixed evenly, the precipitate is separated, and dried to obtain the first product;

Mix butyl titanate and ethanol, add the first product, stir evenly, slowly add dropwise to water with a pH of 5, the amount of water is 3 times the volume of ethanol, stir for 40 min, centrifuge and wash the mixture, and put it at 80 After drying at degrees Celsius for 4 hours, the obtained solid was ground and calcined at 500 degrees Celsius for 2 hours in a nitrogen atmosphere, and cooled to room temperature to obtain modified nano-titanium dioxide.

The heat pipes of the heat exchange devices in Examples 1 to 4 were cleaned regularly, and the effects of different cleaning cycles on the heat exchange efficiency were evaluated.

The cleaning method is:

Have your pressure washer gun ready and connected to the water source.

Manually open the butterfly valve of the main desulfurization and keep it fully open.

Close the lower inlet of the heat exchanger and the outlet gate valve of the induced draft fan, and reduce the frequency of the induced draft fan and the blower to the minimum safe frequency.

After the temperature of the heat exchanger is lower than 150 degrees, open the side doors on both sides of the heat exchanger and the sewage outlet.

Directly flush the inner heat pipe with a high-pressure water gun.

The heat exchanger in Example 1 is cleaned every 1 month. After cleaning, the maximum temperature of the air in the cold source can reach 210 degrees Celsius; 20 days later, the maximum temperature of the air in the cold source is 190 degrees Celsius; Before cleaning, the maximum temperature in the cold source can reach 210 degrees Celsius. 180 degrees Celsius.

The heat exchanger in Example 2 is cleaned every 1 month. After cleaning, the maximum temperature of the air in the cold source can reach 215 degrees Celsius; 20 days later, the maximum temperature of the air in the cold source is 190 degrees Celsius; Before cleaning, the maximum temperature in the cold source can reach 215 degrees Celsius. 186 degrees Celsius.

The heat exchanger in Example 3 is cleaned every 2 months. After cleaning, the maximum air temperature in the cold source can reach 212 degrees Celsius; 20 days later, the maximum air temperature in the cold source is 203 degrees Celsius; Before cleaning, the maximum temperature in the cold source can reach 212 degrees Celsius. 201 degrees Celsius.

In Example 4, the heat exchanger is cleaned every 2 months. After cleaning, the maximum air temperature in the cold source can reach 215 degrees Celsius; 20 days later, the maximum air temperature in the cold source is 208 degrees Celsius; Before cleaning, the maximum temperature in the cold source can reach 205 degrees Celsius. Celsius.

The above detailed descriptions are specific descriptions of feasible embodiments of the present invention, and the above embodiments are not intended to limit the scope of the invention. middle.

Claims (10)

1. A heat exchange device, characterized in that, comprising: a cold source, the cold source includes a first box body and a blower, and the first box body communicates with the blower; A heat exchanger, the heat exchanger includes a second box body, a heat pipe and an induced draft fan, the heat pipe is arranged in the second box body, the induced draft fan is connected to the second box body, and the second box body is connected to the second box body. smoke pipe connection; The second box is connected to the first box, the heat pipe includes a vaporization section and a liquefaction section, and the vaporization section is distributed in the second box. 2 . The heat exchange device according to claim 1 , wherein there is not less than one heat pipe. 3 . 3 . The heat exchange device according to claim 2 , wherein the flow rate of the flue gas in the smoke pipe is 15,000-25,000 Nm ³ /h, and the temperature of the flue gas is 350-450° C. 4 . 4 . The heat exchange device according to claim 1 , wherein the flow rate of the air in the first box is 15,000-20,000 Nm ³ /h, and the temperature of the air is 25-35° C. 5 . 5 . The heat exchange device according to claim 1 , wherein the blower is electrically connected to the induced draft fan, and after the blower is stopped, the induced draft fan also needs to be stopped. 6 . 6. A heat exchange device according to claim 1, wherein the air inlet of the first box is connected to the blower, and the air outlet of the first box is provided with a temperature sensor and a pressure sensor. 7 . The heat exchange device according to claim 1 , wherein a pressure sensor is arranged in the smoke pipe, and a temperature sensor is arranged in the heat pipe. 8 . 8. A heat exchange device according to claim 1, wherein the smoke pipe comprises a conveying pipe and a tee, the conveying pipe is connected with the tee, and the tee comprises a smoke inlet, a first A split port and a second split port, the smoke inlet is connected with the conveying pipe, the first split port is connected with the second box body, and the second split port is connected with the butterfly valve; The opening degree of the butterfly valve is 50-80%. 9 . The heat exchange device according to claim 1 , wherein an inspection port is provided on the second box body. 10 . 10 . The heat exchange device according to claim 1 , wherein an ash hopper is arranged on the second box body. 11 .

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