Boiler blow-off, temperature reduction, noise reduction and white smoke elimination system

Abstract

A boiler blow-off, temperature reduction, noise reduction and white smoke elimination system comprises a water supplementing tank, a boiler water feeding pump and a pipe network, and is characterized in that a coil heat exchange device (2) is arranged in the water supplementing tank (1) so that heat exchange can be conducted between regularly-discharged sewage and normal-temperature water in the water supplementing tank, soft water or desalted water with a certain pressure is contained in the pipe network, and the boiler water feeding pump (3) pressurizes water in the water supplementing tank (1) and supplies heat to the water supplementing tank (1). And a sleeve type heat exchange device (5) is arranged on a steam discharge pipe (8) led to the periodic blowdown flash tank (4), so that the phenomenon that the steam discharge pipe (8) of the periodic blowdown flash tank (4) emits white smoke is reduced or eliminated, meanwhile, boiler feed water is preheated, and the temperature of the boiler feed water is increased. The boiler blow-off, temperature reduction, noise reduction and white smoke elimination system has the advantages that waste heat of blow-off water is fully utilized, the boiler feed water temperature is increased, the heat efficiency of the boiler can be indirectly improved, the temperature and flow of flash steam are reduced, the water content in the steam is effectively reduced, and energy is saved. Therefore, the phenomenon that the steam is diffused and emits white smoke is reduced, and the noise is reduced by utilizing the small-hole noise reduction principle.

Description

Technical Field

[0001] The utility model relates to a boiler blowdown system, specifically, a boiler blowdown cooling, noise reduction and white smoke elimination system. Background Art

[0002] In order to control the water quality of boiler water to meet the index specified in the boiler water quality, and keep the impurities in the boiler water within a certain limit, it is necessary to continuously discharge the boiler water with a large salt and alkali content and the deposited water slag, sludge, and loose precipitates from the boiler. This process is the boiler blowdown. The boiler blowdown methods are divided into continuous blowdown and regular blowdown.

[0003] The continuous blowdown water of the boiler generally enters the continuous blowdown flash tank for pressure reduction and flashing. The secondary steam generated after flashing is led out from the upper part of the continuous blowdown flash tank and connected to the deaerator, and the hot sewage at the bottom of the continuous blowdown flash tank is connected to the boiler regular blowdown flash tank.

[0004] The regular blowdown of the boiler is generally directly discharged to the regular blowdown flash tank. When the boiler blowdown water with a certain pressure is discharged into the flash tank, the volume expands, the pressure decreases, and at the same time the saturation temperature also decreases accordingly. After the pressure is reduced, a part of the heat is released, and this part of the heat is absorbed by the water as the latent heat of vaporization, causing part of the blowdown water to vaporize. There will be some steam discharged from the steam discharge pipe of the regular blowdown flash tank, emitting white steam, which will condense into small water droplets in the air and fall to the ground, corroding the equipment and pipelines in the boiler auxiliary machine area. At the same time, a lot of noise will be generated during the steam discharge, causing noise pollution. The boiler regular blowdown system is an inevitable steam exhaust and emptying process. In this process, in addition to the noise pollution and heat pollution to the environment, a large amount of treated chemical water is also wasted.

[0005] The boiler regular blowdown system is an inevitable steam exhaust and emptying process. In this process, in addition to the noise pollution and heat pollution to the environment, a large amount of treated chemical water is also wasted. The white steam will condense into small water droplets in the air and fall to the ground, which will also corrode the equipment and pipelines in the boiler auxiliary machine area. The blowdown water has a certain temperature, and its sensible heat is not recovered, which is also a waste of energy. And when the high-temperature water is discharged to the blowdown cooling pond, some clean cold water needs to be mixed in to reduce its temperature, increasing the amount of sewage, indirectly increasing the load of the sewage treatment equipment, and wasting a certain amount of resources.

[0006] Therefore, the known boiler blowdown system structure has the above-mentioned various inconveniences and problems. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a safe and reliable boiler blowdown cooling, noise reduction and white smoke elimination system.

[0008] To achieve the above purpose, the technical solution of the utility model is:

[0009] A boiler blowdown cooling, noise reduction and white smoke elimination system includes a makeup water tank, a boiler feed water pump, and a pipe network, and is characterized in that:

[0010] A coil heat exchange device is arranged in the makeup water tank to exchange heat between the regularly drained sewage and the normal temperature water in the makeup water tank, and the exchanged hot water is discharged to a regular blowdown flash tank;

[0011] There is soft water or demineralized water with a certain pressure in the pipe network. The soft water or demineralized water exchanges heat with the flashed steam in the steam discharge pipe of the regular blowdown flash tank through a coil heat exchange device arranged in the steam discharge pipe of the regular blowdown flash tank, preheats the boiler makeup water while reducing the temperature of the flashed steam, and cools and condenses the flashed steam into water, which then falls into the regular blowdown flash tank;

[0012] The boiler feed water pump pressurizes the water in the makeup water tank and leads it to a shell-and-tube heat exchange device arranged on the steam discharge pipe of the regular blowdown flash tank to exchange heat with the flashed steam in the steam discharge pipe of the regular blowdown flash tank, preheats the boiler feed water, reduces the temperature of the flashed steam, and cools the flashed steam into condensed water, and the condensed water enters the regular blowdown flash tank;

[0013] Among them: the flashed steam from the regular blowdown flash tank passes through a shell-and-tube heat exchange device, a water baffle with evenly distributed small holes, a coil heat exchange device, and a water baffle with evenly distributed small holes arranged in the steam discharge pipe of the regular blowdown flash tank in sequence, exchanges heat with the shell-and-tube heat exchange device and the coil heat exchange device, partially becomes condensed water, and falls along the steam discharge pipe and the steam discharge pipe of the regular blowdown flash tank, effectively reducing the water content in the steam, thereby reducing or eliminating the noise and white smoke. The noise reduction and white smoke elimination system can also adopt the following technical measures to further achieve this.

[0014] For the above-mentioned boiler blowdown cooling, noise reduction and white smoke elimination system, the small hole diameter of the water baffle (6) is 15 - 20 mm.

[0015] For the above-mentioned boiler blowdown cooling, noise reduction and white smoke elimination system, the sum of the areas of the evenly distributed small holes is greater than 1.5 times the area of the discharge port of the steam discharge pipe.

[0016] After adopting the above technical solutions, the boiler blowdown cooling, noise reduction and white smoke elimination system of the present utility model has the following advantages:

[0017] 1. Make full use of the waste heat of the drained sewage and at the same time increase the temperature of the boiler feed water, which can indirectly improve the thermal efficiency of the boiler;

[0018] 2. Reduce the temperature and flow rate of the flashed steam, effectively reduce the water content in the steam, thereby reducing the phenomenon of white smoke emitted during steam discharge;

[0019] 3. Utilize the small hole sound absorption principle to reduce noise. Description of the Drawings

[0020] Figure 1 This is a schematic diagram of the process configuration of the boiler blowdown cooling, noise reduction, and white smoke elimination system according to the embodiments of the present invention. Specific Embodiments

[0021] The present invention will be further described below in conjunction with the embodiments and their accompanying drawings.

[0022] Embodiment 1

[0023] The boiler blowdown cooling, noise reduction, and white smoke elimination system of the present invention includes a make-up water tank, a boiler feed water pump, and a pipe network.

[0024] Now please refer to Figure 1 , Figure 1 , which is a schematic diagram of the process configuration of the boiler blowdown cooling, noise reduction, and white smoke elimination system according to the embodiments of the present invention. As shown in the figure, for the boiler regular blowdown cooling, noise reduction, and white smoke elimination system, the regularly discharged boiler blowdown water is first led to the boiler make-up water tank, and the water in the make-up water tank is preheated through the coil heat exchange device arranged in the make-up water tank, and the temperature of the boiler blowdown water is reduced. At the same time, the boiler feed water pump or the deaerating feed water pump (the boiler feed water for boilers without a deaerator, and the deaerating feed water for boilers with a deaerator) pressurizes the water in the make-up water tank, and first exchanges heat with the flashed steam in the steam discharge pipe of the regular blowdown flash tank through the shell-and-tube heat exchange device arranged on the steam discharge pipe of the regular blowdown flash tank, preheating the boiler feed water or deaerating feed water while reducing the temperature of the flashed steam, effectively reducing the water content in the steam, thereby reducing the phenomenon of white smoke emitted during steam discharge, achieving the effect of purifying the steam, and reducing environmental pollution. The end of the steam discharge pipe of the regular blowdown flash tank and the orifice plate of the pipe orifice are provided with uniformly distributed small holes with a diameter of 15 - 20 mm, which can achieve the purpose of noise elimination, thereby reducing the noise pollution of steam discharge.

[0025] The process flow of the boiler blowdown cooling, noise reduction, and white smoke elimination system of the present invention:

[0026] 1. Regular blowdown water flow: The regularly discharged blowdown water exchanges heat with the normal temperature water in the make-up water tank 1 through the coil heat exchange device 2 arranged in the boiler make-up water tank 1, and after the temperature is reduced, it is discharged to the regular blowdown flash tank 4.

[0027] 2. The soft water or demineralized water with a certain pressure in the pipe network first exchanges heat with the flashed steam in the steam discharge pipe 8 of the regular blowdown flash tank 4 through the coil heat exchange device 7 arranged in the steam discharge pipe of the regular blowdown flash tank, preheating the boiler make-up water while reducing the temperature of the flashed steam, and condensing the flashed steam into water by cooling, and then dropping into the regular blowdown flash tank 4.

[0028] 3. The boiler feed water pump or deaerating feed water pump 3 (for boilers without deaerators, it is boiler feed water; for boilers with deaerators, it is deaerating feed water) pressurizes the water in the make-up water tank and first leads it to the shell-and-tube heat exchange device 5 installed on the steam discharge pipe 8 of the regular blowdown flash tank to exchange heat with the flashed steam in the steam discharge pipe 8 of the regular blowdown flash tank, preheating the boiler feed water or deaerating feed water while reducing the temperature of the flashed steam, and condensing the flashed steam into water, which then drops into the regular blowdown flash tank 4.

[0029] 4. The flashed steam from the regular blowdown flash tank 4 successively passes through the shell-and-tube heat exchange device 5, the water baffle 6 with evenly distributed small holes, the coil heat exchange device 7, and the water baffle with evenly distributed small holes installed in the steam discharge pipe 8 of the regular blowdown flash tank to exchange heat with the above heat exchange devices. Part of it becomes condensed water and drops along the steam discharge pipe 8 of the regular blowdown flash tank, effectively reducing the water content in the steam, thereby reducing or eliminating the phenomenon of white smoke emitting from the steam discharge pipe 8 of the regular blowdown flash tank. At the same time, evenly distributed small holes with a pore diameter of 15 - 20 mm are provided on the end of the steam discharge pipe of the regular blowdown flash tank and the baffle installed at the pipe orifice. The sum of the areas of all the small holes is greater than 1.5 times the area of the discharge orifice of the steam discharge pipe. Using the principle of small hole silencing, that is, when the steam passes through the small holes and enters the atmosphere, the flow rate increases, the pressure decreases, and at the same time, eddies and turbulence are generated, which causes the sound waves to scatter and reflect, and part of the sound wave energy is absorbed, thereby reducing the noise. The purpose of silencing is achieved, thus reducing the noise pollution of steam discharge.

[0030] The utility model has substantial features and remarkable technical progress. The boiler blowdown cooling, noise reduction, and white smoke elimination system of the utility model first leads the regular boiler blowdown water to the boiler make-up water tank, preheats the water in the make-up water tank through the coil heat exchange device installed in the make-up water tank, and reduces the temperature of the boiler blowdown water. While making full use of the waste heat of the blowdown water, it increases the temperature of the boiler feed water, which can indirectly improve the thermal efficiency of the boiler.

[0031] First, the boiler make-up water is passed through the coil heat exchange device installed in the steam discharge pipe of the regular blowdown flash tank to exchange heat with the flashed steam in the steam discharge pipe of the regular blowdown flash tank, preheating the boiler make-up water while reducing the temperature of the flashed steam, and condensing the flashed steam into water, which then drops into the regular blowdown flash tank. While preheating the boiler make-up water, it reduces the temperature and flow rate of the flashed steam, effectively reducing the water content in the steam, thereby reducing the phenomenon of white smoke emitted during steam discharge, achieving the effect of purifying the steam and reducing environmental pollution.

[0032] The boiler feed pump or deaerating feed pump (for boilers without deaerators, it is boiler feed water; for boilers with deaerators, it is deaerated feed water) pressurizes the water in the make-up water tank and first passes it through the shell-and-tube heat exchange device installed on the steam discharge pipe of the regular blowdown flash tank to exchange heat with the flashed steam in the steam discharge pipe of the regular blowdown flash tank. While preheating the boiler feed water or deaerated feed water, it reduces the temperature of the flashed steam, condenses the flashed steam into water, and then it drops into the regular blowdown flash tank. While preheating the boiler feed water or deaerated feed water, it reduces the temperature and flow rate of the flashed steam, effectively reducing the water content in the steam, thereby reducing the phenomenon of white smoke emitted from the steam discharge, achieving the effect of purifying the steam and reducing environmental pollution.

[0033] Water baffle plates with small holes are installed near the shell-and-tube heat exchange device and the coil heat exchange device in the steam discharge pipe of the regular blowdown flash tank. At least ≥2 groups of water baffle plates are installed, and the aperture of the small holes is about 15 - 20 mm, which reduces the flow velocity of the flashed steam and enhances the heat exchange with the heat exchange device. All the small holes are evenly and dispersedly arranged, and the sum of the areas of all the small holes is larger than the area of the original discharge pipe, without affecting the smooth discharge of the steam.

[0034] A baffle plate is installed at the steam discharge port of the regular blowdown flash tank, and evenly distributed small holes with an aperture of 15 - 20 mm are arranged on the baffle plate. Also, evenly distributed small holes with an aperture of about 15 - 20 mm are arranged at the end of the steam discharge pipe of the regular blowdown flash tank. The sum of the areas of all these evenly distributed small holes is more than 1.5 times the area of the discharge port of the steam discharge pipe. These evenly distributed small holes utilize the principle of small hole silencing, that is, when the steam passes through the small holes and enters the atmosphere, the flow velocity increases, the pressure decreases, and at the same time, eddies and turbulence are generated, which makes the sound waves scatter and reflect, and part of the sound wave energy is absorbed, thereby reducing the noise. It achieves the purpose of silencing, thus reducing the noise pollution of steam discharge.

[0035] Without adding new energy media, through the steam-water cycle existing in the boiler itself, it reduces the temperature of the high-temperature blowdown water of the boiler, preheats the boiler feed water, raises the temperature of the boiler feed water, makes full use of the waste heat discharged from the boiler to supplement the energy for preheating the boiler feed water, avoids white smoke from the exhaust pipe of the blowdown flash tank, and avoids production noise pollution. It is an energy-saving and environmental protection technology.

[0036] The above embodiments are only for illustrating the present utility model and not for limiting the present utility model. Those skilled in the relevant technical fields can also make various transformations or changes without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions should also belong to the scope of the present utility model and should be defined by each claim.

Claims

1. A boiler blowdown cooling, noise reduction and white smoke elimination system, comprising a makeup water tank, a boiler feed water pump, and a pipe network, characterized in that: A coil heat exchange device (2) is arranged in the makeup water tank (1) to exchange heat between the regularly discharged sewage and the normal temperature water in the makeup water tank, and the exchanged hot water is discharged to the regular blowdown flash tank (4); The pipe network contains soft water or demineralized water with a certain pressure. The soft water or demineralized water exchanges heat with the steam flashed in the steam discharge pipe (8) of the regular blowdown flash tank through the coil heat exchange device (7) arranged in the steam discharge pipe (8) of the regular blowdown flash tank, preheats the boiler makeup water while reducing the temperature of the flashed steam, and cools and condenses the flashed steam into water, which then falls into the regular blowdown flash tank (4); The boiler feed water pump (3) pressurizes the water in the makeup water tank (1) and leads it to the shell-and-tube heat exchange device (5) arranged on the steam discharge pipe (8) of the regular blowdown flash tank (4) to exchange heat with the steam flashed in the steam discharge pipe (8) of the regular blowdown flash tank, preheats the boiler feed water and reduces the temperature of the flashed steam, so that the flashed steam is cooled into condensed water, and the condensed water enters the regular blowdown flash tank (4); Among them: the steam flashed from the regular blowdown flash tank (4) sequentially passes through the shell-and-tube heat exchange device (5), the water baffle (6) with evenly distributed small holes, the coil heat exchange device (7), and the water baffle with evenly distributed small holes arranged in the steam discharge pipe (8) of the regular blowdown flash tank, exchanges heat with the shell-and-tube heat exchange device (5) and the coil heat exchange device (7), and part of it becomes condensed water, and falls along the steam discharge pipe (8), the steam discharge pipe of the regular blowdown flash tank, effectively reducing the water content in the steam, thereby reducing or eliminating the phenomenon of white smoke emitting from the steam discharge pipe ⑧ of the regular blowdown flash tank.

2. The boiler blowdown temperature reduction, noise reduction and white smoke elimination system according to claim 1, characterized in that, The aperture of the small holes of the water baffle (6) is 15 - 20 mm.

3. The boiler blowdown temperature reduction, noise reduction and white smoke elimination system according to claim 1, characterized in that, The sum of the areas of the evenly distributed small holes is greater than 1.5 times the area of the discharge port of the steam discharge pipe.

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