Sodium silicate kiln exhaust waste heat recovery device

Abstract

The exhaust gas waste heat recovery device of the sodium silicate kiln relates to the technical field of the spray device, and comprises a waste heat recovery tower body arranged in a rectangular shape, wherein the waste heat recovery tower body is provided with low temperature section fillers and high temperature section fillers arranged side by side from top to bottom, and spray pipe groups are respectively provided above the low temperature section fillers and the high temperature section fillers, and each spray pipe group is independently lifted and lowered vertically to adjust the distance with the low temperature section fillers or the high temperature section fillers. The present invention solves the problem that when the spray assembly is used to spray cooling water in the traditional technology, the spraying efficiency is affected due to the blockage or insufficient flow of the nozzle of the existing spray pipe group, and the sprayed cooling water cannot exchange heat with the fillers.

Description

Technical Field

[0001] The invention relates to the technical field of injection devices, and in particular to a waste heat recovery device for tail gas discharged from a sodium silicate kiln. Background Art

[0002] Sodium silicate, commonly known as sodium silicate and glass glue, is a colorless, transparent viscous solid. Its aqueous solution is commonly known as water glass, which is a mineral adhesive. In the production process of sodium silicate, tail gas is easily generated when processing various raw materials. In order to avoid the pollution of tail gas to the environment, tail gas treatment equipment is used to purify it.

[0003] During the use of the exhaust gas treatment device, the generated exhaust gas needs to be passed into the treatment box so as to be processed. However, during the use of the existing exhaust gas treatment device, the exhaust gas is only processed through the treatment box and its purification effect cannot be guaranteed.

[0004] The prior art discloses a patent with a publication number of CN217796754U, which includes a nozzle shell and a nozzle mouth sealing plate; the nozzle shell is a cylindrical structure, and the interior of the nozzle shell is sequentially provided with a nozzle interface portion, a spiral spoiler portion, a radially reduced chamber portion, a connecting straight pipe portion, a radially enlarged chamber portion and a nozzle mouth connecting portion, and the connecting straight pipe portion connects the radially reduced chamber portion and the radially enlarged chamber portion; the nozzle interface portion and the nozzle mouth connecting portion are both cylindrical structures, and a threaded connection portion connected to the spray pipe interface is provided inside the nozzle interface portion and on the inner wall of the spiral spoiler portion, so that the atomization effect is good, and the phosphoric acid tail gas after spraying by the nozzle can continuously meet the emission standards.

[0005] As the existing devices including the above patents are used, the shortcomings of the existing technology are gradually exposed, which are mainly manifested in the following aspects:

[0006] First, when the exhaust gas of the sodium silicate kiln is used to recover waste heat, it is necessary to use a spray component to spray cooling water. However, when the nozzle of the existing spray pipe group is blocked or the flow is insufficient, the spraying efficiency is affected, and the sprayed cooling water cannot exchange heat with the filler.

[0007] Second, when the existing spray structure is in use, the exhaust gas emission varies according to different time periods, which requires frequent corresponding adjustments to the spray flow rate and the operating power of the pump group, which greatly shortens the life of the pump group of the spray structure; or by designing a solenoid valve to control the on and off of the nozzle, due to the harsh working environment, the solenoid valve has a very short service life and is prone to failure.

[0008] Third, when the existing exhaust gas is introduced into the waste heat recovery device, it cannot evenly contact the filler during the rising period, thereby affecting the heat exchange efficiency between the exhaust gas and the spray water.

[0009] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0010] In view of the defects in the prior art, the present invention provides a sodium silicate kiln exhaust gas waste heat recovery device to solve the problem that when the traditional technology uses a spray assembly to spray cooling water, the spraying efficiency is affected due to the blockage of the nozzle of the existing spray pipe group or the insufficient flow, thereby making it impossible for the sprayed cooling water to exchange heat with the filler.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] The waste heat recovery device for tail gas discharged from a sodium silicate kiln comprises a waste heat recovery tower body arranged in a rectangular shape, wherein low-temperature section fillers and high-temperature section fillers are arranged in parallel from top to bottom in the waste heat recovery tower body, and spray pipe groups are respectively arranged above the low-temperature section fillers and the high-temperature section fillers, and each of the spray pipe groups is independently lifted and lowered vertically to adjust the distance with the low-temperature section fillers or the high-temperature section fillers.

[0013] The spray pipe group includes a horizontally arranged main pipe, a plurality of branch pipes are fixedly connected in parallel to one side of the main pipe, a plurality of nozzles are fixedly connected in parallel along the axial direction to the lower surface of each branch pipe, a valve plate is rotatably provided in the branch pipe, and the inlet end of the nozzle is sealed at intervals by the valve plate.

[0014] As an optimized solution, a smoke distribution cavity shell is provided below the high-temperature section filler, and a plurality of smoke outlet tubes connected to the inner cavity thereof are evenly distributed on the upper end of the smoke distribution cavity shell.

[0015] As an optimized solution, a spray water drop guide tube penetrating the smoke distribution chamber shell is fixedly connected to the area of ​​the smoke distribution chamber shell between adjacent smoke outlet pipes.

[0016] As an optimized solution, the smoke outlet pipe includes a straight section extending to the interior of the smoke distribution chamber shell and a conical focusing section located above the smoke distribution chamber shell.

[0017] As an optimized solution, spiral guide vanes are provided on the inner walls of the straight cylinder section and the conical focusing section.

[0018] As an optimized solution, a liquid discharge port communicating with the inner cavity of the smoke distribution chamber shell is provided on the lower surface of the smoke distribution chamber shell below the straight cylinder section.

[0019] As an optimized solution, the upper surfaces of the low-temperature section filler and the high-temperature section filler are provided with grid-shaped dispersed fillers respectively.

[0020] As an optimized solution, the main pipe and the branch pipe are fixedly connected to a support frame, and the support frame is installed in the waste heat recovery tower body along a vertical lifting direction.

[0021] As an optimized solution, the opposite ends of the support frame are respectively threadedly connected with screws, and the two ends of the screws are respectively supported on the inner wall of the waste heat recovery tower body through a seat body, and a driving motor for driving the screw to rotate is fixedly connected to the seat body at the top.

[0022] As an optimized solution, swivels are rotatably provided near both ends of the branch pipe, the two ends of the valve plate are fixedly connected to the opposite side walls of the two swivels, the outer ring of the swivel is fixedly connected to a gear ring, the lower surface of the branch pipe is fixedly connected to a driving machine, the lower surface of the branch pipe is provided with an avoidance hole, and the output end of the driving machine is meshed with the gear ring by a gear.

[0023] As an optimized solution, the valve plate is provided with avoidance grooves at intervals to avoid the inlet end of the nozzle.

[0024] As an optimized solution, a water inlet pipe is fixedly connected to the side wall of the waste heat recovery tower body, the outlet end of the water inlet pipe extends into the waste heat recovery tower body and is connected to an elbow, the upper end of the main pipe is fixedly connected to a connecting tube opposite to the elbow, and a corrugated expansion tube is connected between the elbow and the connecting tube.

[0025] As an optimized solution, a spray water outlet cylinder is provided on the side wall of the waste heat recovery tower body near the bottom. The spray water outlet cylinder is connected to a sodium sulfate brine evaporator through a spray pump. A hot water outlet and a cold water outlet are connected to the sodium sulfate brine evaporator. The cold water outlet is connected to two water inlet pipes through a water supply pipe.

[0026] As an optimized solution, a flue gas inlet tube connected to the flue gas distribution chamber shell is fixedly connected to the side wall of the waste heat recovery tower body.

[0027] As an optimized solution, the high temperature section filler is a ball ring made of 304 material.

[0028] As an optimized solution, the low-temperature section filler is a ball ring made of PE material.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The spray pipe group can be raised and lowered vertically, so when the nozzle of the spray pipe group is blocked or the flow is insufficient, the distance between the spray pipe group and the corresponding filler can be adjusted to improve the heat exchange efficiency;

[0031] When the exhaust gas emission is large, all the nozzles are opened to improve the spray coverage efficiency of cooling water. When the exhaust gas emission is small, the valve plate is driven by the driving machine to rotate, and the nozzles are closed by the valve plate interval type, leaving only half of the nozzles to work normally, which can reduce the amount of spray water used and overcome the problem of frequent damage caused by setting solenoid valves in harsh environments in traditional technologies. There is no need to frequently adjust the pump group, and the operation is convenient;

[0032] Grid-shaped dispersed fillers are respectively arranged above the high-temperature section fillers and the low-temperature section fillers. The spray water will first fall on the grid-shaped dispersed fillers. Under the action of the grid-shaped dispersed fillers, the spray water is broken into small water droplets and more evenly scattered on the high-temperature section fillers and the low-temperature section fillers, thereby improving the heat exchange efficiency.

[0033] The heat in the tail gas can be recovered and the spray water can be circulated by setting a spray pump and a sodium sulfate brine evaporator;

[0034] By setting up a smoke distribution cavity shell and utilizing a smoke outlet tube, the smoke can be evenly sprayed upward, thereby improving the uniformity of contact with the high-temperature section filler;

[0035] The upper port of the flue gas outlet is provided with a conical focusing section, which can focus the falling water and make it enter the flue gas outlet to achieve further contact with the ejected flue gas, thereby improving the heat exchange efficiency;

[0036] The spiral guide blades are arranged at the flue gas outlet to guide the falling spray water to form a spiral downward flow, thereby increasing the kinetic energy of the spray water and the heat exchange efficiency;

[0037] The spray water falling guide tube is used to guide and drop the spray water that has not entered the smoke distribution cavity shell, while the spray water that has entered the smoke distribution cavity shell falls to the bottom of the waste heat recovery tower body through the drain port, and the spray water is collected.

[0038] By setting up the main body of the waste heat recovery tower, the circulating spraying process can be realized, and the function of a wet dust collector can be realized, which can absorb dust in the exhaust gas, further purify the exhaust gas, and improve the qualified rate of emission standards. It can be connected in series after the bag dust collector of the existing system. When the bag dust collector has an unexpected dust leakage, increasing the spraying water volume can play a good interception role, ensure that the emission is up to standard, and reduce the number of shutdowns. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0040] Figure 1 It is a structural schematic diagram of the present invention;

[0041] Figure 2 It is a structural schematic diagram of the valve plate of the present invention;

[0042] Figure 3 It is a structural schematic diagram of the swivel of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the smoke distribution chamber shell of the present invention.

[0044] In the figure: 1-waste heat recovery tower body; 2-high temperature section filler; 3-low temperature section filler; 4-grid-shaped dispersed filler; 5-smoke distribution cavity shell; 6-smoke inlet tube; 7-support frame; 8-screw; 9-driving motor; 10-water inlet pipe; 11-elbow; 12-corrugated telescopic pipe; 13-connecting tube; 14-main pipe; 15-branch pipe; 16-sprinkler; 17-spray water outlet tube; 18-spray pump; 19-sodium sulfate brine evaporator; 20-hot water outlet; 21-cold water outlet; 22-water supply pipe; 23-valve plate; 24-avoidance groove; 25-swivel; 26-gear ring; 27-driving machine; 28-gear; 29-spray water drop guide tube; 30-drainage port; 31-smoke outlet tube; 32-spiral guide blade. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0046] like Figures 1 to 4 As shown, the waste heat recovery device for tail gas discharged from a sodium silicate kiln comprises a waste heat recovery tower body 1 arranged in a rectangular shape, wherein a low temperature section filler 3 and a high temperature section filler 2 are arranged side by side from top to bottom in the waste heat recovery tower body 1, and spray pipe groups are respectively arranged above the low temperature section filler 3 and the high temperature section filler 2, and each spray pipe group is independently lifted and lowered vertically to adjust the distance with the low temperature section filler 3 or the high temperature section filler 2.

[0047] The spray pipe group includes a horizontally arranged main pipe 14, one side of which is fixedly connected to a plurality of branch pipes 15 in parallel, and the lower surface of each branch pipe 15 is fixedly connected to a plurality of nozzles 16 in parallel along the axial direction. A valve plate 23 is rotatably provided in the branch pipe 15, and the inlet end of the nozzle 16 is sealed at intervals by the valve plate 23.

[0048] A smoke distribution chamber shell 5 is provided below the high-temperature section filler, and a plurality of smoke outlet tubes 31 communicating with the inner cavity of the smoke distribution chamber shell 5 are evenly distributed on the upper end portion thereof.

[0049] A spray water drop guide 29 penetrating the smoke distribution chamber shell 5 is fixedly connected to the area between adjacent smoke outlet tubes 31 of the smoke distribution chamber shell 5 .

[0050] The smoke outlet pipe includes a straight section extending to the interior of the smoke distribution chamber shell 5 and a conical flow-gathering section located above the smoke distribution chamber shell 5 .

[0051] Spiral guide vanes 32 are arranged around the inner walls of the straight cylinder section and the conical converging section.

[0052] A liquid discharge port 30 communicating with the inner cavity of the smoke distribution chamber shell 5 is provided on the lower surface of the smoke distribution chamber shell 5 below the straight cylindrical section.

[0053] The upper surfaces of the low-temperature section filler 3 and the high-temperature section filler are provided with grid-shaped dispersed fillers 4 respectively.

[0054] The main pipe 14 and the branch pipe 15 are fixedly connected to the support frame 7 , and the support frame 7 is installed in the waste heat recovery tower body 1 along the vertical lifting direction.

[0055] The opposite ends of the support frame 7 are respectively threadedly connected with screw rods 8, and both ends of the screw rod 8 are respectively supported on the inner wall of the waste heat recovery tower body 1 through a seat body, and a driving motor 9 for driving the screw rod 8 to rotate is fixedly connected to the upper seat body.

[0056] The branch pipe 15 is provided with swivel rings 25 for rotation near both ends. Both ends of the valve plate 23 are fixedly connected to the opposite side walls of the two swivel rings 25. The outer ring of the swivel ring 25 is fixedly connected to a gear ring 26. The lower surface of the branch pipe 15 is fixedly connected to a driving machine 27. The lower surface of the branch pipe 15 is provided with an avoidance hole. The output end of the driving machine 27 is meshed with the gear ring 26 by a gear 28.

[0057] The valve plate 23 is provided with avoidance grooves 24 at intervals to avoid the inlet end of the nozzle 16 .

[0058] A water inlet pipe 10 is fixedly connected to the side wall of the waste heat recovery tower body 1, and the outlet end of the water inlet pipe 10 extends into the waste heat recovery tower body 1 and is connected to an elbow 11. The upper end of the main pipe 14 is fixedly connected to a connecting tube 13 opposite to the elbow 11, and a corrugated telescopic pipe 12 is connected between the elbow 11 and the connecting tube 13.

[0059] A spray water outlet tube 17 is provided on the side wall of the waste heat recovery tower body 1 near the bottom. The spray water outlet tube 17 is connected to a sodium sulfate brine evaporator 19 through a spray pump 18. The sodium sulfate brine evaporator 19 is connected to a hot water outlet 20 and a cold water outlet 21. The cold water outlet 21 is connected to two water inlet pipes 10 through a water supply pipe 22.

[0060] A flue gas inlet tube 6 connected to a flue gas distribution chamber shell 5 is fixedly connected to the side wall of the waste heat recovery tower body 1 .

[0061] The high temperature section filler is 304 material ball ring.

[0062] The low temperature section filler 3 is a ball ring made of PE material.

[0063] The working principle of this device is:

[0064] The spray pipe group can be raised and lowered vertically, so that when the nozzle 16 of the spray pipe group is blocked or the flow is insufficient, the distance between the spray pipe group and the corresponding filler can be adjusted to improve the heat exchange efficiency;

[0065] When the exhaust gas emission is large, all the nozzles 16 are opened to improve the spray coverage efficiency of the cooling water. When the exhaust gas emission is small, the valve plate 23 is driven to rotate by the driving machine 27, and the nozzles 16 are closed by the valve plate 23 in an interval manner, leaving only half of the nozzles 16 to work normally, which can reduce the amount of spray water used, overcome the problem of frequent damage caused by setting the solenoid valve in a harsh environment in the traditional technology, and there is no need to frequently adjust the pump group, which is easy to operate;

[0066] A grid-shaped dispersed filler 4 is respectively arranged above the high-temperature section filler 2 and the low-temperature section filler 3. The spray water will first fall on the grid-shaped dispersed filler 4. Under the action of the grid-shaped dispersed filler 4, the spray water is broken into small water droplets and more evenly scattered on the high-temperature section filler 2 and the low-temperature section filler 3, thereby improving the heat exchange efficiency.

[0067] The heat in the tail gas is recovered and the spray water is circulated by providing a spray pump 18 and a sodium sulfate brine evaporator 19;

[0068] By providing a smoke distribution chamber shell 5, the smoke is evenly sprayed upward by using a smoke outlet tube 31, thereby improving the uniformity of contact with the high-temperature section filler 2;

[0069] The upper end of the smoke outlet tube 31 is provided with a conical focusing section, which can focus the falling water and make it enter the smoke outlet tube 31 to achieve further contact with the ejected smoke, thereby improving the heat exchange efficiency;

[0070] The spiral guide blades 32 are arranged at the smoke outlet tube 31 to guide the falling spray water to form a spiral downward flow, thereby increasing the kinetic energy of the spray water and the heat exchange efficiency;

[0071] The spray water that has not entered the flue gas distribution chamber shell 5 is guided and dropped by the spray water drop guide 29, and the spray water that has entered the flue gas distribution chamber shell 5 drops to the bottom of the waste heat recovery tower body 1 through the drain port 30, and the spray water is collected;

[0072] By setting up the waste heat recovery tower body 1, the circulating spraying process is realized, and the wet dust collector function is also realized, which can absorb dust in the exhaust gas, further purify the exhaust gas, and improve the qualified rate of emission standards. It can be connected in series after the bag dust collector of the existing system. When the bag dust collector has an unexpected dust leakage, the spraying water volume is increased, which can play a good interception role, ensure that the emission is up to standard, and reduce the number of shutdowns.

[0073] After the transformation was completed, the exhaust chimney temperature of the kiln was reduced from 165°C to about 72°C, and the waste heat recovery effect was significant.

[0074] The dust concentration in exhaust gas is reduced from 7-8 mg / Nm³ to 3-5 mg / Nm³ and meets the standard stably for a long time.

[0075] Under the premise that the dust concentration in exhaust gas before spraying is >10㎎ / Nm³ and exceeds the standard, increase the spraying volume to 500m³ / h, and the emission concentration after spraying can still be <8.0㎎ / Nm³ and meet the standard.

[0076] When the pH value of the spray circulating water is 8.3-8.5, the wet desulfurization effect is obvious.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. The exhaust gas waste heat recovery device of sodium silicate kiln is characterized by: The waste heat recovery tower comprises a rectangular waste heat recovery tower body (1), wherein low temperature section fillers (3) and high temperature section fillers (2) are arranged side by side from top to bottom in the waste heat recovery tower body (1), and spray pipe groups are respectively arranged above the low temperature section fillers (3) and the high temperature section fillers (2), and each of the spray pipe groups is independently raised and lowered vertically to adjust the distance between the low temperature section fillers (3) and the high temperature section fillers (2). The spray pipe group comprises a horizontally arranged main pipe (14), a plurality of branch pipes (15) are fixedly connected in parallel to one side of the main pipe (14), a plurality of spray heads (16) are fixedly connected in parallel along the axial direction to the lower surface of each branch pipe (15), a valve plate (23) is rotatably provided in the branch pipe (15), and the inlet end of the spray head (16) is sealed in intervals by the valve plate (23), A smoke distribution cavity shell (5) is provided below the high-temperature section filler (2), and a plurality of smoke outlet tubes (31) connected to the inner cavity of the smoke distribution cavity shell (5) are evenly distributed on the upper end of the smoke distribution cavity shell (5). A spray water drop guide tube (29) that penetrates the smoke distribution chamber shell (5) is fixedly connected to a region of the smoke distribution chamber shell (5) between adjacent smoke outlet tubes (31). The smoke outlet tube (31) comprises a straight tube section extending to the interior of the smoke distribution chamber shell (5) and a conical flow-collecting section located above the smoke distribution chamber shell (5); Spiral guide blades (32) are arranged on the inner walls of the straight cylinder section and the conical flow-concentrating section; A liquid discharge port (30) communicating with the inner cavity of the smoke distribution chamber shell (5) is provided on the lower surface of the smoke distribution chamber shell (5) below the straight cylindrical section.

2. The exhaust gas waste heat recovery device of sodium silicate kiln according to claim 1 is characterized in that: Grid-shaped dispersed fillers (4) are provided on the upper surfaces of the low-temperature section filler (3) and the high-temperature section filler (2).

3. The exhaust gas waste heat recovery device of sodium silicate kiln according to claim 1 is characterized in that: The main pipe (14) and the branch pipe (15) are fixedly connected to a support frame (7), and the support frame (7) is installed in the waste heat recovery tower body (1) in a vertically lifting manner.

4. The exhaust gas waste heat recovery device for sodium silicate kiln according to claim 1 is characterized in that: The branch pipe (15) is rotatably provided with swivel rings (25) at positions near both ends, the two ends of the valve plate (23) are fixedly connected to the opposite side walls of the two swivel rings (25), the outer ring of the swivel ring (25) is fixedly connected to a gear ring (26), the lower surface of the branch pipe (15) is fixedly connected to a driving machine (27), the lower surface of the branch pipe (15) is provided with an avoidance hole, and the output end of the driving machine (27) is meshed with the gear ring (26) by means of a gear (28).

5. The exhaust gas waste heat recovery device of sodium silicate kiln according to claim 1 is characterized in that: The valve plate (23) is provided with avoidance grooves (24) at intervals for avoiding the inlet end of the spray head (16).

6. The exhaust gas waste heat recovery device of sodium silicate kiln according to claim 1 is characterized in that: A water inlet pipe (10) is fixedly connected to the side wall of the waste heat recovery tower body (1), the outlet end of the water inlet pipe (10) extends into the waste heat recovery tower body (1) and is connected to an elbow (11), the upper end of the main pipe (14) is fixedly connected to a connecting tube (13) opposite to the elbow (11), and a corrugated telescopic pipe (12) is connected between the elbow (11) and the connecting tube (13).

7. The exhaust gas waste heat recovery device of sodium silicate kiln according to claim 6 is characterized by: A spray water outlet tube (17) is provided on a side wall of the waste heat recovery tower body (1) near the bottom. The spray water outlet tube (17) is connected to a sodium sulfate brine evaporator (19) via a spray pump (18). The sodium sulfate brine evaporator (19) is connected to a hot water outlet (20) and a cold water outlet (21). The cold water outlet (21) is respectively connected to two water inlet pipes (10) via a water supply pipe (22).

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