Clean and energy-saving yellow phosphorus tail gas boiler

Abstract

The utility model discloses a clean and energy-saving yellow phosphorus tail gas boiler which comprises a combustion chamber, a horizontal heat exchanger and a vertical heat exchanger which are sequentially connected in series through a flue, a drainage pipe of the vertical heat exchanger is connected with a water inlet pipeline of the horizontal heat exchanger, and the horizontal heat exchanger is located on the upstream of the vertical heat exchanger in the flowing direction of yellow phosphorus tail gas. The top of the horizontal heat exchanger shell side is connected with a steam pipeline. And the heat exchange efficiency and the service life of the heat exchanger are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of yellow phosphorus tail gas boilers, in particular to a clean and energy-saving yellow phosphorus tail gas boiler. Background Art

[0002] Traditional gas boilers use the large amount of yellow phosphorus tail gas generated during the yellow phosphorus production process to burn. The high-temperature gas generated by the combustion directly heats soft water to produce steam. The problem caused during the application process is that the heat exchange efficiency is not high. After the heat exchange, the high-temperature tail gas is directly treated and discharged cleanly; and the acid-containing slag generated by the horizontal shell and tube heat exchanger during the direct heat exchange process is easy to clog the tubes, which leads to a decrease in heat exchange efficiency over time. Finally, the tubes are completely clogged and the horizontal shell and tube heat exchanger can only be replaced. Summary of the invention

[0003] The technical problems to be solved by the utility model are low heat exchange efficiency, low thermal energy utilization rate and the existence of pipeline blockage.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a clean and energy-saving yellow phosphorus tail gas boiler, including a combustion chamber, a horizontal heat exchanger and a vertical heat exchanger connected in series through a flue, the drain pipe of the vertical heat exchanger is connected to the water inlet pipe of the horizontal heat exchanger, the horizontal heat exchanger is located upstream of the vertical heat exchanger along the flow direction of the yellow phosphorus tail gas, and the top of the shell of the horizontal heat exchanger is connected to the steam pipe.

[0005] Preferably, the flue is connected to the tube side of the horizontal heat exchanger, the outlet end of the tube side of the horizontal heat exchanger is connected to a converging section, and the reflux section is arranged with an inspection door.

[0006] Preferably, a water inlet pipeline and a sewage pipe are arranged at the bottom of the horizontal heat exchanger, and a water level gauge interface is arranged on the horizontal heat exchanger, and the bottom end of the water level gauge interface is located above the top heat exchange tube in the horizontal heat exchanger.

[0007] Preferably, a collecting pool is provided at the bottom of the vertical heat exchanger, the collecting pool is communicated with the flue, and the collecting pool is located directly above the heat exchange tubes. The water inlet pipe of the vertical heat exchanger is arranged at the bottom, and the drain pipe is arranged at the top.

[0008] Preferably, a thermometer is arranged in the shell side of the vertical heat exchanger, and the thermometer signal is connected to the water inlet valve of the water inlet pipe.

[0009] 1. The utility model provides a clean and energy-saving yellow phosphorus tail gas boiler, which changes the direct heating method of traditional gas boilers and adopts two-stage heat exchange. A vertical heat exchanger is installed in the low-temperature section of the combustion tail gas, and the boiler soft water is preheated first. After the soft water temperature is increased, it is pumped into the high-temperature horizontal heat exchanger for heat exchange to generate high-temperature steam, thereby improving the thermal utilization efficiency of the yellow phosphorus tail gas.

[0010] 2. Install a vertical shell-and-tube heat exchanger in the exhaust section. Because the yellow phosphorus exhaust contains a large amount of dust and coal tar and other substances, the low-temperature section of the heat exchanger is prone to blockage. The traditional horizontal shell-and-tube heat exchanger is prone to blockage after a period of use and needs to be stopped for treatment. In serious cases, the shell-and-tube heat exchanger must be replaced every year. After adopting the vertical heat exchanger, the impurities produced by combustion are settled in the low-temperature section of the heat exchanger by gravity and enter the collection pool, which extends the service life of the shell-and-tube heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0012] Figure 1 It is a schematic diagram of the structure of other structures except the combustion chamber in the embodiment of the utility model.

[0013] Figure 2 It is a top view of an embodiment of the utility model.

[0014] Figure 3 for Figure 2 Section view of the AA plane.

[0015] In the figure: 1. combustion chamber; 2. horizontal heat exchanger; 21. steam discharge pipe; 22. sewage pipe; 3. vertical heat exchanger; 31. collecting tank; 32. water inlet pipe; 33. drainage pipe; 4. flue. DETAILED DESCRIPTION

[0016] like Figure 1-3 The utility model provides a clean and energy-saving yellow phosphorus tail gas boiler, comprising a combustion chamber 1, a horizontal heat exchanger 2 and a vertical heat exchanger 3 which are sequentially connected in series through a flue 4, a drainage pipe 33 of the vertical heat exchanger 3 is connected to a water inlet pipe of the horizontal heat exchanger 2, the horizontal heat exchanger 2 is located upstream of the vertical heat exchanger 3 along the flow direction of the yellow phosphorus tail gas, and the top of the shell side of the horizontal heat exchanger 2 is connected to a steam pipe.

[0017] The yellow phosphorus tail gas is fully burned in the combustion chamber 1 to form high-temperature yellow phosphorus tail gas. The high-temperature yellow phosphorus tail gas passes through the tube side of the horizontal heat exchanger 2 to heat the water in the shell side of the horizontal heat exchanger 2. At this time, the temperature of the yellow phosphorus tail gas is the highest, and the water in the shell side of the horizontal heat exchanger 2 is directly heated to boil to form high-temperature steam. The high-temperature steam is discharged through the steam discharge pipe 21. The remaining high-temperature yellow phosphorus tail gas enters the tube side of the vertical heat exchanger 3 through the flue 4, and preheats the soft water transported to the shell side of the vertical heat exchanger 3. While increasing the temperature of the soft water, the yellow phosphorus tail gas is heat recovered again, and the preheated soft water is transported to the horizontal heat exchanger 2. The yellow phosphorus tail gas passing through the vertical heat exchanger 3 is finally transported to the yellow phosphorus tail gas treatment equipment through the flue 4 for cleaning and discharge.

[0018] like Figure 2As shown, the staff cleans the heat exchange tubes in the horizontal heat exchanger 2. The flue 4 is connected to the tube side of the horizontal heat exchanger 2, and the outlet end of the tube side of the horizontal heat exchanger 2 is connected to a converging section, and the reflux section is provided with an inspection door. The high-temperature yellow phosphorus tail gas passes through the tube side of the horizontal heat exchanger 2. When the equipment is shut down for maintenance, the staff enters the reflux section to clean the inner wall of the heat exchange tube in the horizontal heat exchanger 2 to ensure the smooth flow of the tube side.

[0019] like Figure 1 As shown, in order to ensure the heat exchange efficiency in the horizontal heat exchanger 2. The bottom of the horizontal heat exchanger 2 is provided with a water inlet pipeline and a sewage pipe 22, and the horizontal heat exchanger 2 is provided with a water level gauge interface, and the bottom end of the water level gauge interface is located above the top heat exchange tube in the horizontal heat exchanger 2. When preparing high-temperature steam, water is flooded over all the heat exchange tubes of the horizontal heat exchanger 2 to ensure that each heat exchange tube can contact with water for sufficient heat exchange; the water level gauge is connected to the inside of the horizontal heat exchanger 2 through the water level gauge interface, and the water level gauge is used to monitor whether the water level in the horizontal heat exchanger 2 is above the heat exchange tube.

[0020] like Figure 1 As shown. A collecting pool 31 is provided at the bottom of the vertical heat exchanger 3, and the collecting pool 31 is connected to the flue 4, and the collecting pool 31 is located directly above the heat exchange tube. The water inlet pipe 32 of the vertical heat exchanger 3 is arranged at the bottom, and the drain pipe 33 is arranged at the top. When the yellow phosphorus tail gas is heat exchanged by the vertical heat exchanger 3, the temperature of the yellow phosphorus tail gas is further reduced, so that the acid-containing slag in the yellow phosphorus tail gas settles at low temperature, falls from the vertical heat exchange tube, and enters the collecting pool 31. The staff regularly cleans the collecting pool 31 to ensure the smooth flow of the flue 4.

[0021] As a preferred embodiment of the utility model, in order to ensure the heat exchange efficiency, during preheating, if the water temperature is high, the heat exchange efficiency will continue to decrease. A thermometer is arranged in the shell side of the vertical heat exchanger 3, and the thermometer signal is connected to the water inlet valve of the water inlet pipe 32. The water temperature in the vertical heat exchanger 3 is detected by the thermometer. If the temperature reaches the set temperature, the normal water inlet of the water inlet pipe 32 is guaranteed. If the water temperature is too high, the water inlet of the water inlet pipe 32 is accelerated to ensure that the vertical heat exchanger 3 is at a high heat exchange efficiency and improve the heat utilization rate of the yellow phosphorus tail gas.

Claims

1. A clean and energy-saving yellow phosphorus tail gas boiler, characterized in that: The invention comprises a combustion chamber (1), a horizontal heat exchanger (2) and a vertical heat exchanger (3) which are connected in series in sequence through a flue (4); a drainage pipe (33) of the vertical heat exchanger (3) is connected to a water inlet pipe of the horizontal heat exchanger (2); the horizontal heat exchanger (2) is located upstream of the vertical heat exchanger (3) along the flow direction of the yellow phosphorus tail gas; and the top of the shell side of the horizontal heat exchanger (2) is connected to a steam pipe.

2. A clean and energy-saving yellow phosphorus tail gas boiler as claimed in claim 1, characterized in that: The flue (4) is connected to the tube side of the horizontal heat exchanger (2); the outlet end of the tube side of the horizontal heat exchanger (2) is connected to a converging section, and the reflux section is provided with an inspection door.

3. A clean and energy-saving yellow phosphorus tail gas boiler as claimed in claim 2, characterized in that: A water inlet pipeline and a sewage discharge pipe (22) are arranged at the bottom of the horizontal heat exchanger (2), and a water level gauge interface is arranged on the horizontal heat exchanger (2), wherein the bottom end of the water level gauge interface is located above the top heat exchange tube in the horizontal heat exchanger (2).

4. A clean and energy-saving yellow phosphorus tail gas boiler as claimed in claim 1, characterized in that: A collecting pool (31) is provided at the bottom of the vertical heat exchanger (3), the collecting pool (31) is connected to the flue (4), and the collecting pool (31) is located directly above the heat exchange tubes. The water inlet pipe (32) of the vertical heat exchanger (3) is arranged at the bottom, and the drainage pipe (33) is arranged at the top.

5. A clean and energy-saving yellow phosphorus tail gas boiler as claimed in claim 4, characterized in that: A thermometer is arranged in the shell side of the vertical heat exchanger (3), and a thermometer signal is connected to the water inlet valve of the water inlet pipe (32).

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