CN205055756U - Industry flue gas cooling device - Google Patents

Abstract

The utility model discloses an industrial flue gas cooling device, which comprises: a heat exchanger for cooling industrial flue gas; a liquid storage tank is connected with the heat exchanger through a pipeline and forms a loop to provide cooling for the heat exchanger liquid; the power pump is arranged on the pipeline to drive the coolant to flow in the pipeline; the pH measuring device is connected to the pipeline to measure the pH of the coolant; alkaline or acidic solution is added tank, connected to the pipeline; a control device, connected to the pH measuring device and the alkaline or acidic solution adding tank, for controlling the alkaline or acidic solution adding tank to the pipeline according to the pH Inject alkaline or acidic solutions.

Description

Industrial flue gas cooling device

technical field

The utility model relates to cooling technology, in particular to an industrial flue gas cooling device.

Background technique

High-temperature waste gas or high-temperature waste liquid will be generated in the production of industries (especially thermal power plants, steel plants, chemical plants, etc.), and direct discharge will not only pollute the environment, but also waste energy. In order to save energy, the heat energy of the treated high-temperature flue gas or waste liquid can be recycled. A heat exchanger is a common way. The heat exchanger uses cold water as the heat exchange medium, and the water quality is often pure water or high-purity water.

In production units such as thermal power plants and thermal power plants, the fuel used is mostly coal, and the exhaust gas contains more sulfur-containing gases, such as sulfur dioxide, sulfur trioxide, and hydrogen fluoride. The gas penetrates into the water for heat exchange to produce a chemical reaction to form an acidic solution. (Sulfuric acid, sulfurous acid, hydrofluoric acid), causing great corrosion to heat exchanger pipelines, delivery pipelines, etc. In order to inhibit the occurrence of corrosion, it is necessary to invest in large stainless steel metals. It is found that the pipeline cannot be used after corrosion and perforation, and the pipeline needs to be replaced again, resulting in high operation and maintenance costs.

Utility model content

In view of this, the utility model provides an industrial flue gas cooling device, which is used to solve the problem of acidic or alkaline substances penetrating into the cooling liquid during the industrial flue gas cooling process in the prior art, causing the cooling liquid to become acidic or alkaline, This in turn corrodes cooling lines, leading to high operating and maintenance costs.

The utility model provides an industrial flue gas cooling device, which comprises: a heat exchanger for cooling industrial flue gas; a liquid storage tank is connected with the heat exchanger through a pipeline, and forms a circuit to provide cooling for the heat exchanger liquid; the power pump is arranged on the pipeline to drive the coolant to flow in the pipeline; the pH measuring device is connected to the pipeline to measure the pH of the coolant; alkaline or acidic solution is added tank, connected to the pipeline; control device, connected to the pH measuring device and the alkaline or acidic solution adding tank, for controlling the alkaline or acidic solution adding tank to the pipeline according to the pH Inject alkaline or acidic solutions.

Further, the industrial flue gas cooling device further includes: a reverse osmosis membrane arranged between the alkaline or acidic solution addition tank and the liquid storage tank.

Further, the industrial flue gas cooling device also includes a buffer solution storage tank connected in parallel with the alkaline or acidic solution addition tank to prevent excessive addition of alkaline or acidic solution.

Further, the industrial flue gas cooling device further includes: a reverse osmosis membrane, arranged between the liquid storage tank and the buffer solution tank, for removing unnecessary salt ions in the cooling liquid.

Further, the reverse osmosis membrane is made of acid-resistant or alkali-resistant polymer material.

Further, the reverse osmosis membrane is a multistage reverse osmosis membrane.

Further, the heat exchanger is a multi-stage heat exchanger.

Further, the industrial flue gas cooling device further includes: a coolant supplement tank connected to the pipeline for supplementing the loss of the coolant.

Further, the pipe is made of PTFE or fluoropolymer material.

Further, the alkaline or acidic solution is sodium hydroxide standard solution or standard hydrochloric acid solution.

Compared with the prior art, the utility model provides an industrial flue gas cooling device which has the following beneficial effects: through the device, the acidity and alkalinity of the cooling liquid solution can be continuously adjusted to the required range, so that the cooling liquid can be continuously recycled in the pipeline , Reduce corrosion, reduce waste of coolant resources, and reduce equipment maintenance costs. Moreover, the device has low investment, long service life, and saves resources and energy.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Fig. 1 is a schematic structural view of an industrial flue gas cooling device provided by an embodiment of the utility model;

Fig. 2 is a structural schematic diagram of an industrial flue gas cooling device provided by another embodiment of the utility model;

Fig. 3 is a schematic structural view of an industrial flue gas cooling device provided by another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an industrial flue gas cooling device provided by another embodiment of the present invention;

Fig. 5 is a structural schematic diagram of an industrial flue gas cooling device provided by another embodiment of the utility model;

Fig. 6 is a structural schematic diagram of an industrial flue gas cooling device provided by another embodiment of the utility model;

Fig. 7 is a schematic structural diagram of an industrial flue gas cooling device provided by another embodiment of the present invention.

Explanation of reference signs:

Heat exchanger 110, liquid storage tank 120, pipeline 130, power pump 150, pH measuring device 160, alkaline or acidic solution addition tank 170, control device 180, buffer solution storage tank 190, reverse osmosis membrane 200, coolant replenishment tank 210, heat exchanger 330, pH measuring instrument 340, controller 350, alkaline solution addition tank 360, buffer solution tank 370, power pump 380, water storage tank 310, pipeline 320, pure water replenishment tank 390, heat exchanger 430 , PH measuring instrument 440, controller 450, alkaline solution adding tank 460, power pump 490, buffer solution tank 470, reverse osmosis membrane 480, water storage tank 410, PH measuring instrument 440, pipeline 420, pure water replenishing tank 411, Salinity Meter 442

detailed description

In order to illustrate the embodiments of the utility model or the technical solutions in the prior art more clearly, the utility model will be specifically described below in conjunction with the accompanying drawings and embodiments. The drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Considering that in the prior art, in the process of treating industrial flue gas, the gas permeates into the cooling liquid for heat exchange to produce a chemical reaction to form an acidic or alkaline solution, which will cause great damage to the heat exchanger pipelines, transportation pipelines, etc. corrosion. In order to suppress the occurrence of corrosion, the utility model installs acid-base neutralization equipment on the cooling device, and adopts corrosion-resistant pipelines, so that the corrosion of the cooling device and its pipelines by the flue gas can be greatly reduced, and the normal operation of the cooling device is ensured. Operation and maintenance.

As shown in FIG. 1 , the industrial flue gas cooling device provided by an embodiment of the utility model includes: a heat exchanger 110 for cooling industrial flue gas; a liquid storage tank 120 is connected to the heat exchanger 110 through a pipeline 130 , and form a loop to provide cooling liquid for the heat exchanger 110; the power pump 150 is arranged on the pipeline 130 for driving the cooling fluid to flow in the pipeline 130; the pH measuring device 160 and the pipeline 130 is connected to measure the pH of the cooling liquid; the alkaline or acidic solution addition tank 170 is connected to the pipeline 130; the control device 180 is connected to the pH measuring device 160 and the alkaline or acidic solution addition tank 170 is used to control the alkaline or acidic solution addition tank 170 to inject alkaline or acidic solution into the pipeline 130 according to the pH.

Specifically, cold water is often used as cooling liquid in heat exchangers of cooling devices in industries (especially thermal power plants, steel mills, chemical plants, etc.), and the water quality is often pure water or high-purity water. , acid or alkaline liquid) after heat exchange, it becomes an acid-base solution, which is collected and transported to a pH measuring device through a pipeline. After the pH measuring device measures its pH, the signal is transmitted to the control device, and the control device The pH is controlled by adding an alkaline or acidic solution tank to inject an alkaline or acidic solution into the pipeline to neutralize the solution in the pipeline, so that the cooling liquid can be continuously circulated in the pipeline, reducing the corrosion of the pipeline , reduce the waste of coolant resources, reduce the maintenance cost of equipment, and the device has a small investment and a long service life, saving resources and energy.

In the embodiment of the present invention, a set of salinity measuring instrument and permeable membrane can be added to filter the pipeline solution with salt ions again, which can be applied in occasions that require high purity of the cooling liquid.

Please refer to Fig. 2, in the embodiment of the utility model, the industrial flue gas cooling device further includes: a reverse osmosis membrane 200, which is arranged between the alkaline or acidic solution addition tank 170 and the liquid storage tank 120, It is used to remove unnecessary salt ions in the coolant to ensure the purity of the coolant.

Please refer to Fig. 3, in the embodiment of the present utility model, the industrial flue gas cooling device also includes a buffer solution storage tank 190 connected in parallel with the alkaline or acidic solution addition tank 170 to prevent excessive addition of alkaline or acidic solution or damage to the pH measuring device.

Please refer to Fig. 4, in the embodiment of the present utility model, the industrial flue gas cooling device further includes: a reverse osmosis membrane 200, which is arranged between the liquid storage tank 120 and the buffer solution storage tank 190, for removing the cooling liquid Unnecessary salt ions in the coolant to ensure the purity of the coolant.

In the embodiment of the present utility model, the reverse osmosis membrane 200 is made of acid-resistant or alkali-resistant polymer material, such as PTFE, PVDF, PSU, PES polymer.

In the embodiment of the utility model, the reverse osmosis membrane 200 is a multi-stage reverse osmosis membrane, which provides a stronger filtering effect and satisfies occasions with higher requirements on the acidity and alkalinity of the cooling liquid.

In the embodiment of the utility model, the heat exchanger 110 is a multi-stage heat exchanger, which uses water with a higher temperature after one heat exchange to preheat or condense other fluids, such as air or flue gas, to provide better heat exchange Effect.

Please refer to Fig. 5. In the embodiment of the present utility model, the industrial flue gas cooling device also includes: a cooling liquid supplement tank 210, which is connected to the pipeline 130, and is used to supplement the loss of the cooling liquid. Or the acidic solution is neutralized with the coolant in the pipeline, and the neutralized solution is filtered through a reverse osmosis membrane (optional according to the actual situation) and then returned to the liquid storage tank 120 for standby, and the solution in the pipeline is provided by the power pump 150 for transportation Power to maintain the circulation of coolant.

In the embodiment of the present utility model, the pipeline is made of polytetrafluoroethylene (PTFE for short) or fluoropolymer (PFA, FEP, ETFE, PVDF, etc.), or is lined with fluoropolymer Pipeline, so that the pipeline has strong corrosion resistance, which greatly improves the service life of the pipeline.

In the embodiment of the utility model, the alkaline or acidic solution is sodium hydroxide standard solution or standard hydrochloric acid solution.

In order to explain the utility model in more detail, the content of the utility model is explained below in conjunction with specific embodiments.

Example one:

Please refer to Figure 6. The direct discharge of flue gas generated by coal combustion in thermal power plants will waste huge heat energy, and the recovery and utilization of this part of energy will solve a large amount of energy. In Figure 3, the water in the water storage tank 310 is transported to the heat exchanger 330 through the pipeline 320 through the power pump 380 to exchange heat with the high-temperature flue gas, and the sulfur-containing gas in the flue gas permeates into the water to produce an acidic solution; After the solution flows through the pH measuring instrument 340, it is fed back to the controller 350; the controller 350 controls the alkaline solution addition tank 360 to discharge an appropriate amount of alkaline sodium hydroxide solution and the acidic liquid in the pipeline 320; it is connected to the alkaline solution addition tank The buffer solution tank 370 after 360 is used to prevent acid-base abnormality caused by excessive alkaline solution; the solution in the pipeline is sent back to the water storage tank 310 through the power pump 380; A pure water replenishment tank 390 is added before the water storage tank to maintain water circulation.

Example two:

Please refer to Figure 7. In a thermal power plant, the waste heat of the flue gas generated by coal combustion needs to be recovered and utilized in the form that the flue gas with a higher temperature (above 120°C) is exchanged with the heat exchanger 430 that transports cold water and then becomes low temperature. Flue gas: Due to the coal quality, the flue gas has a high sulfur content (a certain amount of sulfur dioxide, sulfur trioxide, hydrogen fluoride, etc. are produced after combustion), and produces acidic liquid with water, which causes corrosion to the heat exchanger 430, and its operating cost And the maintenance cost is extremely high, the investment is large, the recovery period is long, and the maintenance is inconvenient, especially the metal heat exchanger, which is difficult to clean and difficult to repair. The acidic liquid flows through the pH measuring instrument 440, and the measured value is transmitted to the controller 450. At the same time, the alkaline solution tank 460 is controlled to release an adapted solution to neutralize its alkalinity; Buffer solution tank 470, its purpose is to prevent that alkaline solution adds excessively or PH device is damaged; There is also reverse osmosis membrane 480 between water storage tank 410 and buffer solution tank 470, removes unnecessary salt ion in the solution, guarantees water purity; the power pump 490 constantly retransmits the solution back to the water storage tank 410, and before entering the water storage tank 410, the salinity measuring instrument 442 can monitor the solution concentration and simultaneously monitor the life of the reverse osmosis membrane; the salinity measuring instrument 442 Finally, a pure water supplement tank 411 is installed to supplement the water loss caused by various reasons; the delivery pipe 420 is made of fluorine plastic or fluorine-containing plastic or fluorine-containing lined pipe, which has strong corrosion resistance.

In summary, the industrial flue gas cooling device provided by the embodiment of the utility model continuously adjusts the acidity and alkalinity of the cooling liquid solution to the required range through the device, so that the cooling liquid is continuously recycled in the pipeline, reducing corrosion and reducing The waste of coolant resources reduces the maintenance cost of equipment. Moreover, the device has low investment, long service life, and saves resources and energy.

Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any person with ordinary knowledge in the technical field can make various modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the present utility model should be defined by the claims as the criterion.

Claims (10)

1. An industrial flue gas cooling device, characterized in that, comprising: Heat exchanger for cooling industrial flue gas; The liquid storage tank is connected with the heat exchanger through a pipeline, and forms a loop to provide cooling liquid for the heat exchanger; a power pump is arranged on the pipeline, and is used to drive the cooling liquid to flow in the pipeline; A pH measuring device is connected to the pipeline for measuring the acidity and alkalinity of the cooling liquid; An alkaline or acidic solution adding tank is connected with the pipeline; A control device, connected with the pH measuring device and the alkaline or acidic solution adding tank, is used to control the alkaline or acidic solution adding tank to inject alkaline or acidic solution into the pipeline according to the pH. 2. The industrial flue gas cooling device according to claim 1, further comprising: a reverse osmosis membrane arranged between the alkaline or acidic solution addition tank and the liquid storage tank. 3. The industrial flue gas cooling device according to claim 1, further comprising: a buffer solution storage tank connected in parallel with the alkaline or acidic solution adding tank for preventing excessive addition of alkaline or acidic solution. 4. The industrial flue gas cooling device according to claim 3, further comprising: a reverse osmosis membrane, arranged between the buffer solution storage tank and the liquid storage tank, for removing unnecessary salt ions. 5. The industrial flue gas cooling device according to claim 4, wherein the reverse osmosis membrane is made of acid-resistant or alkali-resistant polymer material. 6. The industrial flue gas cooling device according to claim 4, wherein the reverse osmosis membrane is a multistage reverse osmosis membrane. 7. The industrial flue gas cooling device according to claim 1, wherein the heat exchanger is a multi-stage heat exchanger. 8. The industrial flue gas cooling device according to claim 1, further comprising: a cooling liquid supplement tank connected to the pipeline for supplementing the loss of cooling liquid. 9. The industrial flue gas cooling device according to claim 1, wherein the pipe is made of PTFE or fluoropolymer material. 10. The industrial flue gas cooling device according to claim 1, wherein the alkaline or acidic solution is sodium hydroxide standard solution or standard hydrochloric acid solution.