Glass kiln flue gas denitration device and method

Abstract

The application provides a glass kiln flue gas denitration device and method, which comprises an amino solution storage tank, a buffer tank and a chimney, the amino solution storage tank is connected with the buffer tank, one end of the bottom of the chimney is connected with a flue, a spray pipe is installed in the flue, the spray pipe is connected with the buffer tank, the spray pipe comprises end spray pipes and a middle spray pipe, the end spray pipes are arranged at two ends of the middle spray pipe, the end spray pipes and the middle spray pipe are of the same structure, and the middle parts of the end spray pipes and the middle spray pipe are provided with communication seats; the amino solution is used for redox reaction with flue gas, the process flow is simple, the problems that a catalyst and a specific use temperature range are needed in traditional flue gas denitration treatment are solved, the construction cost is low, the problem that a furnace body needs to be transformed in traditional flue gas denitration treatment is solved, the operation cost is low, the operation is simple, the setting is simple and automatic operation can be realized, the reliability is high, and the maintenance frequency is reduced.

Description

Technical Field

[0001] This invention belongs to the field of flue gas denitrification, specifically a device and method for denitrification of flue gas from a glass kiln. Background Technology

[0002] With the rapid development of my country's economy, glass products are widely used in photovoltaics, aerospace, construction, industry, and communications, and the demand continues to rise. Glass is generally made from a variety of inorganic minerals as the main raw materials, with the addition of a small amount of auxiliary materials. Glass furnaces, as an essential production equipment in the glass manufacturing industry, generate a large amount of dust-laden flue gas during operation. Direct emissions would cause serious environmental pollution. The pollutants in glass furnace flue gas are mainly particulate matter, sulfur oxides (SOx), and nitrogen oxides (NOx), originating from fuel combustion and the volatilization and release during the high-temperature melting of raw materials. Furthermore, due to the alternating combustion conditions of the glass furnace, the concentration of these pollutants fluctuates significantly.

[0003] Currently, the main fuels for glass kilns in my country are petroleum coke (coal tar, heavy oil), natural gas, and coal, while the main raw materials are quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, and soda ash (or mixed with a certain proportion of crushed glass). The general process for flue gas treatment is as follows: the high-temperature flue gas from the kiln outlet is used to generate electricity via a waste heat boiler; the cooled flue gas then enters a desulfurization unit; the desulfurized flue gas then enters a bag filter; and finally, the qualified flue gas is discharged through a chimney.

[0004] The combustion process in glass kilns produces a large amount of polluting flue gas, among which nitrogen oxides are extremely harmful to the environment. Therefore, the flue gas needs to be denitrified before being discharged. However, current technical solutions require high construction and operating costs, which are difficult for small and medium-sized enterprises to afford.

[0005] In summary, the present invention provides a glass furnace flue gas denitrification device and method to solve the above problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a glass kiln flue gas denitrification device and method to solve the problem of excessively high denitrification costs in the prior art.

[0007] A glass furnace flue gas denitrification device includes an amino solution storage tank, a buffer tank, and a chimney. The amino solution storage tank is connected to the buffer tank. A flue is connected to one end of the bottom of the chimney. A spray pipe is installed in the flue and connected to the buffer tank. The spray pipe includes end spray pipes and middle spray pipes. The end spray pipes are located at both ends of the middle spray pipe. The end spray pipes and the middle spray pipes have the same structure. A connecting seat is provided in the middle of both the end spray pipes and the middle spray pipe. Multiple reinforced water supply pipes connect the connecting seat to the end spray pipe. The end spray pipe has a ring structure. Multiple spray heads are installed in a ring array at the inner ring of the end spray pipe. A liquid outlet pipe is connected to the connecting seat in both end spray pipes. An online flue gas detector is installed at the top of the chimney.

[0008] Furthermore, the end nozzle and the middle nozzle are connected by a connecting pipe, with both ends of the connecting pipe connected to a connecting seat.

[0009] Furthermore, water inlet pipes are connected to the end nozzle and the middle nozzle respectively. The water inlet pipes pass through the flue and are connected to a metering water pipe through a water distribution pipe.

[0010] Furthermore, one end of the metering water pipe away from the branch water pipe is connected to the end of the buffer tank near the bottom, and a metering pump is installed on the metering water pipe.

[0011] Furthermore, the outlet pipes are respectively connected to the end of the connecting seat away from the connecting pipe, and baffles are respectively provided at the outlet of the outlet pipes. The baffles are fixedly connected to the surface of the connecting seat by the mounting bracket.

[0012] Furthermore, the buffer tank is connected to the ammonia solution storage tank via a spray pipe, on which a spray pump is installed. Two liquid level sensors are installed inside the buffer tank, located at the top and bottom of one side of the buffer tank.

[0013] A denitrification method for a glass furnace flue gas denitrification device includes the following steps:

[0014] Step 1: The flue gas online detector inside the chimney is used to detect whether nitrogen oxides exceed the standard. If they do, the buffer tank is checked for low liquid level.

[0015] Step 2: The level in the buffer tank is detected by two liquid level sensors. If the liquid level is low, the jet pump is turned on to draw the solution from the ammonia solution storage tank. If the liquid level is not low, the metering pump is turned on.

[0016] Step 3: After the metering pump is turned on, liquid is delivered into the spray pipe through the metering tube and sprayed out through the spray holes in the spray pipe to carry out an oxidation-reduction reaction on the flue gas passing through the spray pipe.

[0017] Step 4: The treated flue gas is tested by an online flue gas detector to check whether nitrogen oxide emissions have decreased. If they have decreased, spraying continues; if they have not decreased, the flow rate of the metering pump is increased.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This invention uses an amino solution to carry out an oxidation-reduction reaction with flue gas. The process is simple, which solves the problems of traditional flue gas denitrification treatment requiring catalysts and specific operating temperature ranges. It also has low construction costs, solves the problem of traditional flue gas denitrification treatment requiring furnace modification, low operating costs, simple operation, simple setup, fully automatic operation, high reliability, and reduced maintenance frequency.

[0020] 2. This invention installs a spray pipe inside the flue. The spray pipe is designed with three sets of spray pipes, which has a wider spray range. When the flue gas passes through, it comes into contact with the flue gas over a larger area, thereby achieving the purpose of denitrification of the flue gas. Liquid outlet pipes and baffles are designed at both ends of the spray pipe to diffuse the spray range in the middle and ensure full-range denitrification.

[0021] 3. This invention detects at the smoke outlet of the chimney to determine whether an increased dosage is needed, allowing for more flexible control of the spray metering and cost savings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a perspective view of the spray pipe of the present invention;

[0024] Figure 3 This is a perspective view of the end nozzle of the present invention;

[0025] Figure 4 This is a flowchart of the present invention.

[0026] In the picture:

[0027] 1. Ammonia solution storage tank;

[0028] 2. Buffer box;

[0029] 3. Flue;

[0030] 4. Spray pipe; 401. End spray pipe; 402. Middle spray pipe; 403. Connecting pipe; 404. Connecting seat; 405. Spray pipe; 406. Reinforced water supply pipe; 407. Spray head; 408. Baffle; 409. Inlet pipe

[0031] 5. Chimney;

[0032] 6. Online flue gas detector;

[0033] 7. Metering pump;

[0034] 8. Jet pump. Detailed Implementation

[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0036] like Figures 1-4 As shown, the present invention provides a glass furnace flue gas denitrification device, including an ammonia solution storage tank 1, a buffer tank 2, and a chimney 5. The ammonia solution storage tank 1 is connected to the buffer tank 2. A flue 3 is connected to one end of the bottom of the chimney 5. A spray pipe 4 is installed in the flue 3 and is connected to the buffer tank 2. The spray pipe 4 includes an end spray pipe 401 and a middle spray pipe 402. The end spray pipe 401 is located at both ends of the middle spray pipe 402. The end spray pipe 401 and the middle spray pipe 402 are connected... Both the end nozzle 401 and the middle nozzle 402 have a connecting seat 404 in the middle. The connecting seat 404 and the end nozzle 401 are connected by multiple reinforced water supply pipes 406. The end nozzle 401 has a ring structure. Multiple spray heads 407 are installed in the inner ring of the end nozzle 401 and arranged in a ring array. The connecting seat 404 in both end nozzles 401 is connected to a liquid outlet pipe 405. An online flue gas detector 6 is installed on the top of the chimney 5.

[0037] In one embodiment of the present invention, the end nozzle 401 and the middle nozzle 402 are connected by a connecting pipe 403, and the two ends of the connecting pipe 403 are respectively connected to the connecting seat 404.

[0038] In one embodiment of the present invention, water inlet pipes 409 are respectively connected to the end nozzle 401 and the middle nozzle 402. The water inlet pipes 409 pass through the flue 3 and are connected to the metering water pipe through the water distribution pipe.

[0039] In one embodiment of the present invention, one end of the metering water pipe away from the branch water pipe is connected to one end of the buffer tank 2 near the bottom, and a metering pump 7 is installed on the metering water pipe.

[0040] In one embodiment of the present invention, the liquid outlet pipe 405 is connected to one end of the connecting seat 404 away from the connecting pipe 403, and a baffle 408 is provided at the opening of the liquid outlet pipe 405. The baffle 408 is fixedly connected to the surface of the connecting seat 404 by a mounting bracket.

[0041] In one embodiment of the present invention, the buffer tank 2 is connected to the amino solution storage tank 1 through a spray pipe, and a spray pump 8 is installed on the spray pipe. Two liquid level sensors are installed inside the buffer tank 2, and the liquid level sensors are respectively set at the upper and lower ends of one side of the buffer tank 2.

[0042] A denitrification method for a glass furnace flue gas denitrification device includes the following steps:

[0043] Step 1: The flue gas online detector 6 inside the chimney 5 is used to detect whether nitrogen oxides exceed the standard. If they do, the buffer tank is checked for low liquid level.

[0044] Step 2: The level in the buffer tank 2 is detected by two liquid level sensors. If the liquid level is low, the jet pump 8 is turned on to extract the solution in the ammonia solution storage tank 1. If the liquid level is not low, the metering pump 7 is turned on.

[0045] Step 3: After the metering pump 7 is turned on, it delivers liquid into the spray pipe 4 through the metering tube and sprays it out through the spray holes in the spray pipe 4 to carry out an oxidation-reduction reaction on the flue gas passing through the spray pipe 4.

[0046] Step 4: The treated flue gas is tested by the flue gas online detector 6 to check whether the nitrogen oxide emissions have decreased. If they have decreased, the spraying continues; if they have not decreased, the flow rate of the metering pump 7 is increased.

[0047] Specific working principle:

[0048] When the spray pipe 4 sprays water, the liquid outlet pipes 405 at both ends also spray water. After being blocked by the baffle 408, the water from the liquid outlet pipe 405 diffuses outward and is sprayed onto the surface of the baffle 408. The ammonia solution is sprayed outward, which increases the spraying area and can also cover the spraying range in the middle of the spray pipe 4, thereby better treating the flue gas passing through the spray pipe 4 for denitrification.

[0049] This invention utilizes an amino solution to induce an oxidation-reduction reaction with flue gas. The process is simple, solving the problems of traditional flue gas denitrification treatment requiring catalysts and specific operating temperature ranges. It also boasts low construction costs, eliminates the need for furnace modifications, and reduces operating costs. Operation is simple, setup is straightforward, and it can operate fully automatically with high reliability, reducing maintenance frequency. By installing spray pipes 4 within the flue duct 3, designed with three sets of spray nozzles, the spray range is wider, allowing for greater contact with the flue gas as it passes through, thus achieving denitrification. At both ends of the spray pipes 4 are designed outlet pipes 405 and baffles 408 to diffuse the spray range in the middle, ensuring full-range denitrification. Detection at the flue gas outlet of the chimney 5 determines whether a larger dosage is needed, allowing for more flexible control of the spray metering and saving costs.

[0050] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A glass kiln flue gas denitration device, comprising an amino solution storage tank (1), a buffer tank (2) and a chimney (5), characterized in that: The amino solution storage tank (1) is connected with the buffer tank (2), one end of the bottom of the chimney (5) is connected with the flue (3), the spraying pipe (4) is installed in the flue (3), the spraying pipe (4) is connected with the buffer tank (2), the spraying pipe (4) comprises end spray pipe (401) and middle spray pipe (402), the end spray pipe (401) is arranged at both ends of the middle spray pipe (402), the end spray pipe (401) and the middle spray pipe (402) are same in structure, the end spray pipe (401) and the middle of the middle spray pipe (402) are provided with the communication seat (404), the communication seat (404) and the end spray pipe (401) are connected through a plurality of reinforced water pipes (406), the end spray pipe (401) is of annular structure, a plurality of spray heads (407) are installed at the inner ring of the end spray pipe (401) and are arranged in annular array, the communication seat (404) in the two end spray pipes (401) is connected with the liquid outlet pipe (405), the top of the chimney (5) is provided with the flue gas on-line detector (6); The end spray pipe (401) and the middle spray pipe (402) are connected through the communication pipe (403), the two ends of the communication pipe (403) are connected on the communication seat (404), the liquid outlet pipe (405) is connected on the communication seat (404) away from the communication pipe (403), the pipe opening of the liquid outlet pipe (405) is provided with the baffle (408), the baffle (408) is fixedly connected on the surface of the communication seat (404) through the mounting frame.

2. The glass kiln flue gas denitration device according to claim 1, characterized in that: The end spray pipe (401) and the middle spray pipe (402) are respectively connected with the water inlet pipe (409), the water inlet pipe (409) penetrates the flue (3) and is connected with the metering water pipe through the water distribution pipe.

3. The glass kiln flue gas denitration device according to claim 2, characterized in that: One end of the metering water pipe away from the water distribution pipe is connected on one end of the buffer tank (2) close to the bottom, the metering pump (7) is installed on the metering water pipe.

4. The glass kiln flue gas denitration device according to claim 1, characterized in that: The buffer tank (2) and the amino solution storage tank (1) are communicated through the injection pipe, the injection pump (8) is installed on the injection pipe, two liquid level sensors are installed in the buffer tank (2), the liquid level sensors are arranged on the upper and lower ends of one side of the buffer tank (2).

5. The denitration method of the glass kiln flue gas denitration device according to claims 1-4, characterized in that: The steps include the following steps: Step one: the flue gas on-line detector (6) in the chimney (5) detects, detects whether the nitrogen oxide is overproof, if overproof, detects whether the buffer tank is low liquid level; Step two: the buffer tank (2) is detected by two liquid level sensors, if the liquid level is low, the injection pump (8) is started, the solution in the amino solution storage tank (1) is extracted, if the liquid level is not low, the metering pump (7) is started; Step three: after the metering pump (7) is started, the liquid is transported to the spraying pipe (4) through the metering pipe, the liquid is sprayed through the spray hole in the spraying pipe (4), the flue gas passing through the spraying pipe (4) is subjected to oxidation and reduction reaction; Step four: the treated flue gas is detected by the flue gas on-line detector (6), whether the nitrogen oxide emission is reduced is detected, if reduced, the spraying is continued, if not reduced, the flow of the metering pump (7) is increased.

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