Water-saving type partition plate type blowdown well for dry quenching waste heat boiler

Abstract

The utility model belongs to the technical field of dry quenching, and particularly relates to a water-saving partition plate type blow-down well for a dry quenching waste heat boiler, which is characterized by comprising a casing, an inlet partition plate, a middle partition plate, a heat exchanger and a blow-down pump. A water inlet in the hot water pool is sealed by an inlet partition plate, the top of the partition plate sealing cover is connected with the side wall of the shell in a sealed mode, a downward water inlet channel is arranged between the inlet partition plate and the side wall of the shell, the distance between the bottom of the inlet partition plate and the bottom of the shell is 150-350 mm, and a heat exchanger is arranged in the hot water pool on the outer side of the inlet partition plate. The upper edge of the middle partition plate is lower than the shell; a submersible sewage pump is arranged in the cold water pool, and an overflow water outlet is formed in the side wall of the cold water pool and is lower than the upper edge of the middle partition plate. The built-in heat exchanger has the advantages that the unique built-in heat exchanger of the blowdown well is adopted, the cooling mode of mixing production water and water in the blowdown well is overturned, and the built-in heat exchanger can be widely popularized.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry coke quenching, and in particular relates to a water-saving baffle-type sewage well for a dry coke quenching waste heat boiler. Background Art

[0002] The important components of the CDQ system include the CDQ furnace and the boiler. During the CDQ production operation, the inert circulating gas cools the red coke in the CDQ furnace. After absorbing the sensible heat of the red coke, the high-temperature inert circulating gas passes through the primary dust collector to remove the coarse particles of powdered coke and enters the boiler. The boiler absorbs heat to generate steam. The cooled inert circulating gas passes through the secondary dust collector to remove the fine particles of powdered coke, and then is blown into the CDQ furnace by the circulating fan to continue circulating and cooling the red coke. Due to the boiler's requirements for the quality of boiler water, in order to ensure the safe operation of the boiler, it is necessary to discharge the boiler water in the boiler to maintain a certain salt content of the boiler water and discharge impurities such as insoluble sediments and rust. Since the continuous sewage of the CDQ boiler has a high temperature after coming out of the continuous sewage expansion device, it is necessary to inject industrial water into the sewage well to adjust the temperature. After the produced water is mixed and cooled in the sewage well, part of it is sent to the coking professional water seal tank, and the other part is discharged from the sewage well drainage pipe. The mixing amount of production water is about three times the amount of sewage. Due to the mixing of production water, the total discharge volume of the sewage well is greatly increased, resulting in a waste of water resources.

[0003] The Chinese utility model patent with application number 201920747669.5 discloses a device for heating and recycling wastewater from dry coke quenching, which belongs to the field of coking equipment and includes a dry coke quenching oven, a steam pipe, a wastewater pipe, a wastewater pump, a wastewater well and a wastewater expander. A water seal groove is arranged on the top of the dry coke quenching oven, one end of the steam pipe is connected to the water seal groove, and the other end is connected to the wastewater expander. The wastewater expander is connected to the wastewater well through a pipe, and the wastewater pump is arranged in the wastewater well, and the wastewater pipe is connected to the wastewater pump. The device can recycle the wastewater from the dry coke quenching boiler and regularly discharge the steam from the wastewater expander.

[0004] The Chinese utility model patent with application number 202020753440.5 discloses a heat recovery system for continuous sewage discharge from a dry coke quenching boiler in a coking plant, including a water-water heat exchanger, a sewage well and a steam-water heat exchanger; the water-water heat exchanger is connected to the continuous sewage discharge expander of the dry coke quenching boiler through a pipeline, the water-water heat exchanger is connected to the sewage well through a pipeline, the sewage well is connected to the drainage network through a pipeline, the chemical water storage device of the dry coke quenching desalted water station is connected to the water-water heat exchanger through a pipeline; the water-water heat exchanger is connected to the steam-water heat exchanger through a pipeline, the steam-water heat exchanger is connected to the steam pipeline, the steam-water heat exchanger is connected to the chemical water outlet pipeline, and the steam-water heat exchanger is connected to the steam condensate water pipeline. The disadvantage of this scheme is that the structure is complex and occupies a large area. Utility Model Content

[0005] The purpose of the utility model is to provide a water-saving baffle-type sewage well for dry quenching waste heat boiler, overcome the shortcomings of the prior art, adopt a built-in heat exchanger in the sewage well, change the cooling form of the production water mixing in the sewage well, and use the circulating cooling water heat exchange form to reduce the temperature of the sewage, thereby reducing the total sewage volume and saving water consumption.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A water-saving baffle-type sewage well for a dry coke quenching waste heat boiler, characterized in that it comprises a shell, an inlet baffle, a middle baffle, a heat exchanger and a sewage pump, the shell is divided into a hot water pool on the water inlet side and a cold water pool on the water outlet side by the middle baffle, the water inlet in the hot water pool is sealed by the inlet baffle, the top of the baffle seal is sealed and connected to the shell side wall, a downward water inlet channel is provided between the inlet baffle and the shell side wall, the bottom of the inlet baffle is 150-350mm away from the bottom of the shell, a heat exchanger is provided in the hot water pool outside the inlet baffle, and the bottom of the heat exchanger is 100-300mm away from the bottom of the shell; the upper edge of the middle baffle is 200-300mm lower than the shell height; a submersible sewage pump is provided in the cold water pool, the outlet of the sewage pump is connected to the dry coke quenching water seal system through a pipeline, an overflow drain is provided on the side wall of the cold water pool, and the overflow drain is lower than the upper edge of the middle baffle.

[0008] The cross-sectional area ratio of the hot water pool to the water inlet pipe is 20-50:1.

[0009] The heat exchange medium in the heat exchanger is water, which is connected via a circulating cooling water inlet pipe and a circulating cooling water outlet pipe.

[0010] The overflow drain outlet is 250-400 mm lower than the upper edge of the middle partition.

[0011] The cross-sectional area ratio of the hot water pool to the cold water pool is 1.5-3:1.

[0012] A heat-insulating layer is arranged outside the shell, a well cover is arranged on the top of the shell, and a venting pipe is arranged on the well cover.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) The unique built-in heat exchanger for the sewage well has overturned the cooling form of mixing production water in the sewage well, and also saved the floor space of the supporting heat exchanger equipment. The sewage well has a compact structure and can be applied to the dry coke quenching production system as a modular product;

[0015] 2) Compared with conventional mixing and cooling sewage discharge, the utility model greatly reduces the amount of sewage discharge, saves water resources, and is widely applicable to the sewage discharge system of dry coke quenching engineering boilers, as well as the upgrading and transformation of other boiler sewage discharge systems with similar working fluids;

[0016] 3) Since the addition of production feed water in the conventional dry coke quenching waste heat boiler blowdown system is cancelled, the final blowdown volume of the conventional dry coke quenching waste heat boiler blowdown well is reduced, saving water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the process structure of an embodiment of the utility model.

[0018] In the figure: 1-hot water tank, 2-cold water tank, 3-inlet partition, 4-middle partition, 5-heat exchanger, 6-sewage pump, 7-shell, 8-water inlet, 9-overflow drain, 10-CDQ water seal system. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0021] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0022] See Figure 1, is a schematic diagram of the process structure of an embodiment of a water-saving baffle-type sewage well for a dry coke quenching waste heat boiler of the utility model, comprising a shell 7, an inlet baffle 3, a middle baffle 4, a heat exchanger 5 and a sewage pump 6. The shell 7 is divided into a hot water pool 1 on the water inlet side and a cold water pool 2 on the water outlet side by the middle baffle 4. The water inlet 8 in the hot water pool 1 is sealed by the inlet baffle 3. The top of the baffle sealing is sealed and connected to the side wall of the shell 7. A downward water inlet channel is provided between the inlet baffle 3 and the side wall of the shell 7. The bottom of the inlet partition 3 is 250 mm away from the bottom of the shell 7. A heat exchanger 5 is arranged in the hot water pool 1 outside the inlet partition 3. The bottom of the heat exchanger 5 is 240 mm away from the bottom of the shell 7. The upper edge of the middle partition 4 is 260 mm lower than the height of the shell 7. A submersible sewage pump 6 is arranged in the cold water pool 2. The outlet of the sewage pump 6 is connected to the dry quenching water seal system 10 through a pipeline. An overflow drain 9 is arranged on the side wall of the cold water pool 2. The overflow drain 9 is lower than the upper edge of the middle partition 4.

[0023] In the embodiment, the cross-sectional area ratio of the hot water pool 1 to the water inlet pipe is 25:1. The heat exchange medium in the heat exchanger 5 is water, which is connected through the circulating cooling water inlet pipe and the circulating cooling water outlet pipe. The overflow drain 9 is 300mm lower than the upper edge of the middle partition 4. The cross-sectional area ratio of the hot water pool 1 to the cold water pool 2 is 2:1. An insulation layer is provided outside the shell 7 to reduce heat consumption.

[0024] The utility model discloses a water-saving baffle-type sewage well for a dry coke quenching waste heat boiler, and the specific steps of the sewage discharge process are as follows:

[0025] 1) The wastewater from the CDQ waste heat boiler enters through the water inlet 8, and then flows downward through the inlet baffle 3, and then flows into the hot water pool 1 from the bottom of the water inlet channel; the wastewater from the CDQ waste heat boiler is 120℃ and the flow rate is 2t / h.

[0026] 2) The wastewater in the hot water pool 1 exchanges heat with the heat exchanger 5 submerged therein, and the temperature of the wastewater drops by no less than 20°C. The temperature in the hot water pool is 105°C.

[0027] 3) After the wastewater is cooled by heat exchange in the hot water tank 1, it overflows from the top of the middle partition 4 to the cold water tank 2. The temperature in the cold water tank is 45°C.

[0028] 4) The sewage pump 6 sends the normal temperature boiler sewage in the cold water tank 2 to the CDQ water seal system 10 for secondary use. The sewage well of the utility model is a sealed structure, and a well cover is provided on the top of the shell 7. The flashed steam in the sewage well is discharged from the vent pipe provided on the well cover to the CDQ waste heat boiler silencer. Excess sewage is discharged from the overflow drain 9.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-saving baffle-type sewage well for a dry coke quenching waste heat boiler, characterized in that: It includes a shell, an inlet partition, a middle partition, a heat exchanger and a sewage pump. The shell is divided into a hot water pool on the water inlet side and a cold water pool on the water outlet side by the middle partition. The water inlet in the hot water pool is sealed by the inlet partition, and the top of the partition cover is sealed and connected with the shell side wall. A downward water inlet channel is provided between the inlet partition and the shell side wall. The bottom of the inlet partition is 150-350mm away from the bottom of the shell. A heat exchanger is provided in the hot water pool outside the inlet partition, and the bottom of the heat exchanger is 100-300mm away from the bottom of the shell; the upper edge of the middle partition is 200-300mm lower than the shell height; a submersible sewage pump is provided in the cold water pool, and the outlet of the sewage pump is connected with the dry quenching water seal system through a pipeline. An overflow drain is provided on the side wall of the cold water pool, and the overflow drain is lower than the upper edge of the middle partition.

2. A water-saving baffle-type sewage well for a dry coke quenching waste heat boiler according to claim 1, characterized in that: The cross-sectional area ratio of the hot water pool to the water inlet pipe is 20-50:

1.

3. The water-saving baffle-type sewage well for a dry coke quenching waste heat boiler according to claim 1, characterized in that: The heat exchange medium in the heat exchanger is water, which is connected via a circulating cooling water inlet pipe and a circulating cooling water outlet pipe.

4. The water-saving baffle-type sewage well for a dry coke quenching waste heat boiler according to claim 1, characterized in that: The overflow drain outlet is 250-400 mm lower than the upper edge of the middle partition.

5. The water-saving baffle-type sewage well for a dry coke quenching waste heat boiler according to claim 1, characterized in that: The cross-sectional area ratio of the hot water pool to the cold water pool is 1.5-3:

1.

6. The water-saving baffle-type sewage well for a dry coke quenching waste heat boiler according to claim 1, characterized in that: A heat-insulating layer is arranged outside the shell, a well cover is arranged on the top of the shell, and a venting pipe is arranged on the well cover.

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