CN219199237U

CN219199237U - High-temperature flue gas heat recycling device

Info

Publication number: CN219199237U
Application number: CN202320002072.4U
Authority: CN
Inventors: 冯海涛; 刘建勇; 周尧; 魏凯; 李可明
Original assignee: Qingdao Ronghe New Material Technology Co Ltd
Current assignee: Qingdao Ronghe New Material Technology Co Ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-06-16
Anticipated expiration: 2033-01-03

Abstract

The utility model discloses a high-temperature flue gas heat recycling device, and belongs to the technical field of high-temperature flue gas heat recycling. The technical proposal is as follows: the device comprises a vacuum evaporator, wherein the vacuum evaporator is connected with a vacuum pump, the vacuum evaporator is provided with an air inlet pipe, an air outlet pipe, a condensed water inlet pipe and a water vapor outlet pipe, the water vapor outlet pipe is connected with a water vapor inlet of an absorber, and an absorbent is arranged in the absorber; the absorbent aqueous solution outlet of the absorber is connected with the absorbent aqueous solution inlet of the water distribution disc in the high-temperature evaporator through an absorbent aqueous solution inlet pipe, and a pump is arranged on the absorbent aqueous solution inlet pipe. The utility model adopts the principle that water evaporation in the lithium bromide-water binary solution needs to absorb a large amount of heat to absorb the heat in the high-temperature flue gas, thereby realizing the recycling of the heat energy of the flue gas; and meanwhile, the heat in the space to be cooled is absorbed by utilizing the low evaporation temperature of water under the low-pressure vacuum working condition, so that the cooling function of the space to be cooled is realized, and the cooling cost of the air conditioner required by the space to be cooled is reduced.

Description

High-temperature flue gas heat recycling device

Technical Field

The utility model relates to the technical field of high-temperature flue gas heat recycling, in particular to a high-temperature flue gas heat recycling device.

Background

With the rapid development of China and the global chemical industry, more and more chemical enterprises are built in various places. As is well known, chemical enterprises are large energy consumption enterprises, and a large amount of energy is required to be input when various products are processed and produced, so that the required products are obtained; at the same time, production facilities, cooling facilities, exhaust facilities, etc. also output a large amount of dissipated energy. For example, kiln tail gas of glass processing enterprises is discharged, and a large amount of high-temperature tail gas with the temperature of more than 300 ℃ is discharged into the environment; as well as refining enterprises and energy enterprises, the exhaust drums which are high in cloud are used for discharging unused energy released from petroleum, natural gas and coal into the environment, and a great deal of energy waste is caused. The existing high-temperature tail gas recycling mode is a mode of heating water by flue gas and generating power by water vapor, but the power generation efficiency is low because the flue gas cannot efficiently heat the water to the evaporation temperature of 100 ℃. There is therefore a need to develop a more efficient device for collecting and utilizing heat in high temperature flue gases.

Disclosure of Invention

The utility model aims to solve the technical problems that: the defect of the prior art is overcome, and the high-temperature flue gas heat recycling device is provided, and the principle that a great amount of heat is required to be absorbed by water evaporation in a lithium bromide-water binary solution is adopted to absorb the heat in the high-temperature flue gas, so that the recovery of heat energy in the flue gas is realized; meanwhile, the utility model utilizes the low evaporation temperature of water under the low-pressure vacuum working condition to absorb the heat in the space needing cooling so as to realize the cooling function of the space needing cooling, and reduces the cooling cost of the air conditioner needed by the space needing cooling.

The technical scheme of the utility model is as follows:

the high-temperature flue gas heat recycling device comprises a vacuum evaporator, wherein the vacuum evaporator is connected with a vacuum pump, the vacuum evaporator is provided with an air inlet pipe, an air outlet pipe, a condensed water inlet pipe and a water vapor outlet pipe, the water vapor outlet pipe is connected with a water vapor inlet of an absorber, and an absorbent is arranged in the absorber; the absorbent aqueous solution outlet of the absorber is connected with the absorbent aqueous solution inlet of the water distribution disc in the high-temperature evaporator through an absorbent aqueous solution inlet pipe, and a pump is arranged on the absorbent aqueous solution inlet pipe; the high-temperature evaporator is provided with a high-temperature flue gas inlet pipe and a flue gas outlet pipe, a plurality of evaporation pipes are arranged in the high-temperature evaporator, an inlet of each evaporation pipe is connected with an outlet of the water distribution disc, a water collecting tank is connected with an outlet of each evaporation pipe, the water collecting tank is connected with a reflux port of the absorber through a reflux pipe, and a pump is arranged on the reflux pipe; the water vapor outlet of the water distribution disc is connected with the water vapor inlet of the condenser through a pipeline, and the condensed water outlet of the condenser is connected with the condensed water inlet pipe.

Preferably, the evaporation tube is spirally arranged.

Preferably, a plurality of corrugated plates are arranged in the vacuum evaporator at intervals up and down, a water distribution plate is arranged above each corrugated plate, and holes are formed in the water distribution plate.

Preferably, check valves are respectively arranged on the condensed water inlet pipe and the absorbent aqueous solution inlet pipe.

Preferably, the return pipe is communicated with a corrosion inhibitor inlet pipe, the corrosion inhibitor inlet pipe is connected with a corrosion inhibitor tank, a valve is arranged on the corrosion inhibitor inlet pipe, and a pH meter is arranged on the return pipe.

Preferably, the sump is inclined so that the absorbent aqueous solution having a low water content is pumped out after this collection.

Compared with the prior art, the utility model has the following beneficial effects:

the device adopts the principle that water evaporation in the lithium bromide-water binary solution needs to absorb a large amount of heat to absorb the heat in the high-temperature flue gas, so that the high-efficiency recycling of the heat energy in the flue gas is realized; meanwhile, the utility model utilizes the low evaporation temperature of water under the low-pressure vacuum working condition to absorb the heat in the space needing cooling so as to realize the cooling function of the space needing cooling, and reduces the cooling cost of the air conditioner needed by the space needing cooling.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic structural view of the corrugated plate and the water distribution plate of the present utility model.

In the figure, 1, a vacuum evaporator; 2. a vacuum pump; 101. an air inlet pipe; 102. an air outlet pipe; 103. condensed water inlet pipe; 104. a water vapor outlet pipe; 105. corrugated plates; 106. a water distribution plate; 3. an absorber; 301. a return pipe; 302. a corrosion inhibitor enters a pipe; 4. a high temperature evaporator; 401. feeding the absorbent aqueous solution into a pipe; 402. a water distribution plate; 403. high-temperature flue gas inlet pipe; 404. a flue gas outlet pipe; 405. an evaporation tube; 406. a water collection tank; 5. a pump; 6. a condenser; 7. a check valve; 8. a corrosion inhibitor tank; 9. a valve; 10. a pH meter.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

Example 1

As shown in fig. 1, the embodiment provides a high-temperature flue gas heat recycling device, which comprises a vacuum evaporator 1 with 870pa pressure, a vacuum pump 2 matched with the vacuum evaporator for vacuumizing, wherein the vacuum evaporator 1 is provided with an air inlet pipe 101, an air outlet pipe 102, a condensed water inlet pipe 103 and a water vapor outlet pipe 104, and a check valve 7 is arranged on the condensed water inlet pipe 103 to ensure that condensed water flows into the vacuum evaporator 1 in one direction; the steam outlet pipe 104 is connected with a steam inlet of the absorber 3, and the absorber 3 is filled with absorbent; the absorbent aqueous solution outlet of the absorber 3 is connected with the absorbent aqueous solution inlet of the water distribution disc 402 in the high-temperature evaporator 4 through an absorbent aqueous solution inlet pipe 401, and a pump 5 and a check valve 7 are arranged on the absorbent aqueous solution inlet pipe 401; the bottom of the high-temperature evaporator 4 is provided with a high-temperature flue gas inlet pipe 403, the top is provided with a flue gas outlet pipe 404, a plurality of evaporating pipes 405 are arranged in the high-temperature evaporator 4, the inlet of the evaporating pipes 405 is connected with the outlet of the water distribution disk 402, the outlet of the evaporating pipes 405 is connected with an inclined water collecting tank 406, the water collecting tank 406 is connected with the reflux port of the absorber 3 through a reflux pipe 301, and the reflux pipe 301 is provided with a pump 5; the water vapor outlet of the water distribution plate 402 is connected with the water vapor inlet of the condenser 6 through a pipeline, and the condensed water outlet of the condenser 6 is connected with the condensed water inlet pipe 103.

The vacuum pump 2 keeps vacuum in the vacuum evaporator 1, and the operation can be stopped after the vacuum evaporator 1 is vacuumized only when the vacuum evaporator is started initially. Condensed water in the 870pa vacuum evaporator 1 can be evaporated at the temperature of 5 ℃, and the evaporation absorbs heat, so that the introduced air is cooled down to form cold air for workshops. The condensed water evaporates to form vapor, the pressure becomes higher, the evaporation becomes lower gradually, and the temperature required for evaporation becomes higher, and in order to maintain the low pressure state, the vacuum evaporator 1 is connected to one absorber 3, and the absorber 3 is filled with lithium bromide absorbent. Since lithium bromide has a small partial pressure of water vapor, is much smaller than the saturated vapor pressure of water at room temperature, has strong hygroscopicity, and an aqueous solution of lithium bromide has a capability of absorbing water vapor at a much lower temperature than it, lithium bromide as an absorbent absorbs a large amount of water vapor. Along with the continuous absorption of the absorbent, the concentration of the lithium bromide solution gradually rises, the absorption gradually saturates, the high-concentration lithium bromide aqueous solution is pumped into the water distribution disc 402 of the high-temperature evaporator 4 through the pump 5 and respectively flows into the plurality of evaporation pipes 405, in the flowing process, high-temperature flue gas is introduced into the high-temperature evaporator 4 through the high-temperature flue gas inlet pipe 403, the evaporation pipes 405 are heated to more than 75 ℃, water in the lithium bromide aqueous solution is evaporated, a large amount of flue gas heat is absorbed, and the higher the temperature is, the faster the evaporation is. As the air pressure in the high temperature evaporator 4 increases, the evaporated water vapor can only enter the condenser 6 through the water vapor outlet of the water distribution tray 402 under pressure due to the blocking of the check valve 7. The condenser 6 is provided with a spherical condensation pipe and external circulating cooling water, water vapor is introduced into the spherical condensation pipe, cooling water is introduced outside the pipe, high-temperature and high-pressure water vapor is cooled and condensed under the cooling of the cooling water to obtain low-temperature and low-pressure condensed water, the low-temperature and low-pressure condensed water is sent into the condensed water inlet pipe 103 through the pump 5, and the condensed water as the condensed water of the vacuum evaporator 1 is subjected to low-temperature and low-pressure evaporation heat absorption again so as to realize refrigeration. After the water vapor in the high temperature evaporator 4 evaporates, the lithium bromide medium with low water content is collected in the water collecting tank 406, and then is sent back to the absorber 3 by the pump 5 to be used as an absorbent for absorbing the water vapor formed in the vacuum evaporator 1, so that a complete internal circulation is formed.

In order to fully utilize the heat of the flue gas, the high-temperature evaporator 4 and the flue gas emission are arranged in the same device, and in order to reduce the air resistance of the high-temperature evaporator 4 to the flue gas emission, a spiral evaporation tube 405 with larger specific surface area and smaller resistance is adopted, and an evaporation shell with larger diameter at the middle and lower parts and smaller diameter at the upper part is adopted, so that the middle and lower parts are in a continuous high-temperature state.

In this embodiment, the evaporation tube 405 needs to be heated by the high-temperature evaporator 4 to evaporate water vapor from the lithium bromide aqueous solution, and a great amount of heat needs to be absorbed in the process, so that the high-temperature flue gas is used as a heat source, the high-temperature evaporator with proper specification can be selected according to the flue gas amount and the temperature of the flue gas, the heat in the flue gas is fully utilized, and sufficient cool air is finally provided for a workshop, so that the recycling of the high-temperature flue gas is realized.

Example 2

On the basis of embodiment 1, as shown in fig. 1-2, the evaporating pipes 405 are spirally arranged, a plurality of corrugated plates 105 are arranged in the vacuum evaporator 1 at intervals up and down, a water distribution plate 106 is arranged above each corrugated plate 105, and holes are arranged on the water distribution plates 106. Both the spiral evaporator tube 405 and the corrugated plate 105 increase the heat exchange area and increase the rate of water evaporation.

Example 3

On the basis of the embodiment 1, as shown in fig. 1, the return pipe 301 is communicated with a corrosion inhibitor inlet pipe 302, the corrosion inhibitor inlet pipe 302 is connected with a corrosion inhibitor tank 8, a valve 9 is arranged on the corrosion inhibitor inlet pipe 302, and the pH meter 10 is arranged on the return pipe 301.

Because the absorbent lithium bromide has corrosion effect on metals such as carbon steel, copper and the like, a corrosion inhibitor is required to be added, so that the corrosiveness is reduced. Therefore, a corrosion inhibitor tank 8 is arranged, the pH value of the solution in the return pipe 301 is detected by the pH meter 10, when the pH value is too low, the controller controls to open the valve 9 on the corrosion inhibitor inlet pipe 302, lithium hydroxide and 0.15-0.25wt% of lithium chromate are added into the lithium bromide aqueous solution in the absorber 3, and the pH value of the solution is regulated to be in the range of 9-10, so that a good corrosion inhibition effect is achieved.

Although the present utility model has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present utility model is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present utility model by those skilled in the art without departing from the spirit and scope of the present utility model, and it is intended that all such modifications and substitutions be within the scope of the present utility model/be within the scope of the present utility model as defined by the appended claims. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The high-temperature flue gas heat recycling device is characterized by comprising a vacuum evaporator (1), wherein the vacuum evaporator (1) is connected with a vacuum pump (2), the vacuum evaporator (1) is provided with an air inlet pipe (101), an air outlet pipe (102), a condensed water inlet pipe (103) and a water vapor outlet pipe (104), the water vapor outlet pipe (104) is connected with a water vapor inlet of an absorber (3), and an absorbent is arranged in the absorber (3); an absorbent aqueous solution outlet of the absorber (3) is connected with an absorbent aqueous solution inlet of a water distribution disc (402) in the high-temperature evaporator (4) through an absorbent aqueous solution inlet pipe (401), and a pump (5) is arranged on the absorbent aqueous solution inlet pipe (401); the high-temperature evaporator (4) is provided with a high-temperature flue gas inlet pipe (403) and a flue gas outlet pipe (404), a plurality of evaporation pipes (405) are arranged in the high-temperature evaporator (4), an inlet of each evaporation pipe (405) is connected with an outlet of a water distribution disc (402), an outlet of each evaporation pipe (405) is connected with a water collecting tank (406), the water collecting tanks (406) are connected with a reflux port of the absorber (3) through a reflux pipe (301), and a pump (5) is arranged on the reflux pipe (301); the water vapor outlet of the water distribution disc (402) is connected with the water vapor inlet of the condenser (6) through a pipeline, and the condensed water outlet of the condenser (6) is connected with the condensed water inlet pipe (103).

2. The high temperature flue gas heat recovery device according to claim 1, wherein the evaporation tube (405) is spirally arranged.

3. The high-temperature flue gas heat recycling device according to claim 1, wherein a plurality of corrugated plates (105) are arranged in the vacuum evaporator (1) at intervals up and down, a water distribution plate (106) is arranged above each corrugated plate (105), and holes are formed in the water distribution plate (106).

4. The high-temperature flue gas heat recycling device according to claim 1, wherein check valves (7) are respectively arranged on the condensed water inlet pipe (103) and the absorbent aqueous solution inlet pipe (401).

5. The high-temperature flue gas heat recycling device according to claim 1, wherein the return pipe (301) is communicated with a corrosion inhibitor inlet pipe (302), the corrosion inhibitor inlet pipe (302) is connected with a corrosion inhibitor tank (8), a valve (9) is arranged on the corrosion inhibitor inlet pipe (302), and a pH meter (10) is arranged on the return pipe (301).

6. The high temperature flue gas heat recovery device according to claim 1, wherein the water collection trough (406) is arranged obliquely.