Carrier gas heat exchange equipment easy to clean

Abstract

The carrier gas heat exchange equipment easy to clean is of a shell-and-tube structure, the heat exchange tube serves as a carrier gas channel, carrier gas passes through the tube pass, and cooling water passes through the shell pass; heat exchange tubes in the heat exchange tube bundle are arranged in a vertical array, and washing nozzles are arranged at the tops of the heat exchange tubes; when the heat exchange tube needs to be cleaned, the water supply equipment based on the high-pressure flushing water provides high-pressure water for the flushing nozzles, the high-pressure flushing water is sprayed to the inner cavity of the heat exchange tube through the flushing nozzles, and dust accumulated in the inner cavity is flushed; due to the fact that the heat exchange tube is a vertically-arranged straight tube, flushing water can flow out along the inner cavity of the heat exchange tube based on gravity, and dust accumulated in the heat exchange tube can be cleaned without manual cleaning. According to the technical scheme, carrier gas generated after high-humidity sludge is dried is subjected to heat exchange, the heat exchange pipes are cleaned in the mode that water is sprayed to the pipe pass for flushing, the complexity of cleaning operation of the heat exchange structure can be reduced, and the cleaning time of the heat exchange pipe bundle is effectively shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying, in particular to an easy-to-clean carrier gas heat exchange device. Background Art

[0002] Due to the characteristics of municipal and industrial sludge raw materials, the moisture content of high-wet sludge is usually around 60~80%. The carrier gas generated after the wet sludge is dried by the sludge dryer has the characteristics of high dust and high water vapor. The carrier gas generated by sludge drying is generally treated by heat exchange and cooling with a conventional heat exchanger, and then directly discharged to the incinerator for treatment or biological deodorization equipment through a carrier gas fan.

[0003] In the prior art, the commonly used carrier gas heat exchange structures after sludge incineration are relatively complex. For example, the patent with application number CN202221230057.7 discloses an energy-saving device for a sludge disc dryer, in which the heat exchange tube system is a serpentine tube structure or a fin tube structure. However, in actual use, it is found that due to the characteristics of high dust and high water vapor in the carrier gas generated after the incineration of high-humidity sludge, the carrier gas flows through the heat exchanger, and the moist dust is easy to accumulate on the wall. For heat exchange tubes with complex structures, whether the carrier gas flows through the inside or outside of the heat exchange tube, the dust carried in the carrier gas is easy to accumulate on the heat exchange tube bundle, affecting the heat exchange effect. However, due to the large number of dense and complex heat exchange tube structures arranged inside the heat exchanger, when cleaning the heat exchange tube, it is necessary to shut down the machine, open the tube bundle structure, and manually use tools to clean it, which will take a long time and affect the effective operation time of the equipment. Summary of the invention

[0004] In order to solve the problem in the prior art that the heat exchange tube bundle for carrier gas heat exchange generated after the incineration of high-humidity sludge is complex in structure, which results in the need to shut down and open the equipment for cleaning during the cleaning operation, thus affecting the effective operation time of the equipment, the utility model provides an easy-to-clean carrier gas heat exchange equipment, which can reduce the complexity of the cleaning operation of the heat exchange structure and effectively reduce the cleaning time.

[0005] The structure of the utility model is as follows: an easily cleanable carrier gas heat exchange device, comprising: a heat exchanger shell and a heat exchange tube bundle, characterized in that it also comprises: a flushing structure;

[0006] The bottom of the heat exchanger shell is provided with a carrier gas inlet, the top is provided with a carrier gas outlet, and the heat exchange area is located in the inner cavity of the heat exchanger shell between the carrier gas inlet and the carrier gas outlet; the lower end of the heat exchange area is provided with a cooling water outlet, and the top is provided with a cooling water inlet;

[0007] The heat exchange tube bundle is arranged inside the heat exchanger shell, and the heat exchange tubes in the tube bundle are arranged in a vertical array; the bottom port of the heat exchange tube is connected to the carrier gas inlet, and the top port is connected to the carrier gas outlet;

[0008] The flushing structure includes: a flushing nozzle, each heat exchange tube is equipped with one flushing nozzle, the flushing nozzle is arranged at the top of the inner cavity of the heat exchange tube, and the flushing nozzle is connected to a water supply device for high-pressure flushing water.

[0009] It is further characterized by:

[0010] It also includes: a pressure difference measuring device, the pressure difference measuring device is arranged between the carrier gas inlet and the carrier gas outlet;

[0011] It also includes: a demister, which is arranged at the upper part of the inner cavity of the heat exchanger shell and is located between the carrier gas outlet and the heat exchange tube bundle;

[0012] It also includes: a sewage outlet, which is arranged at the bottom of the heat exchanger shell.

[0013] The present application provides an easy-to-clean carrier gas heat exchange equipment, which is a shell-and-tube structure, using the heat exchange tube as a carrier gas channel, with carrier gas passing through the tube side and cooling water passing through the shell side; the heat exchange tubes in the heat exchange tube bundle are arranged in a vertical array, and a flushing nozzle is set at the top of the heat exchange tube; when the heat exchange tube needs to be cleaned, a water supply device based on high-pressure flushing water provides high-pressure water to the flushing nozzle, and high-pressure flushing water is sprayed into the inner cavity of the heat exchange tube through the flushing nozzle to flush the dust accumulated in the inner cavity; because the heat exchange tube is a vertically arranged straight tube, the flushing water can flow out along the inner cavity of the heat exchange tube based on gravity, and the dust accumulated in the heat exchange tube can be cleaned without manual cleaning. Based on the technical solution of the present application, the carrier gas generated after the high-humidity sludge is dried is heat exchanged, and the heat exchange tube is cleaned by spraying water to the tube side, which can reduce the complexity of the cleaning operation of the heat exchange structure and effectively reduce the cleaning time of the heat exchange tube bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the carrier gas heat exchange equipment of this application;

[0015] Figure 2 Schematic diagram of the heat exchange tube fixing plate structure. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the present application includes an easy-to-clean carrier gas heat exchange device, specifically including: a heat exchanger shell 1, a pressure difference measuring device 4, a demister 5, a heat exchange tube bundle and a flushing structure. In specific applications, the heat exchange shell is made of carbon steel (cooling water is used in the shell side), and the heat exchange tube is made of stainless steel (carrier gas is used in the tube side), which can effectively prevent the corrosive components in the carrier gas from corroding the shell. At the same time, reinforcing ribs are evenly distributed on the outside of the shell to prevent the shell from deformation.

[0017] The heat exchanger shell 1 is vertically arranged based on the support structure 7. A carrier gas inlet 1-1 is arranged at the bottom of the heat exchanger shell 1, and a carrier gas outlet 1-2 is arranged at the top. The heat exchange area is located in the inner cavity of the heat exchanger shell between the carrier gas inlet 1-1 and the carrier gas outlet 1-2; a cooling water inlet 1-3 is arranged at the top of the heat exchange area, and a cooling water outlet 1-4 is arranged at the lower end. The carrier gas inlet 1-1 is connected to the exhaust port of the sludge dryer. The carrier gas after heat exchange is discharged from the carrier gas outlet 1-2 through the fan and enters the subsequent equipment. The cooling water inlet 1-3 and the cooling water outlet 1-4 are connected to the cooling water circulation equipment.

[0018] The heat exchange tube bundle is arranged inside the heat exchanger shell 1, and the heat exchange tubes 2 in the tube bundle are arranged in a vertical array. The tube body of the heat exchange tube 2 passes through the heat exchange area from top to bottom; the bottom port of the heat exchange tube 2 is connected to the carrier gas inlet 1-1, and the top port is connected to the carrier gas outlet 1-2.

[0019] The heat exchange tube bundle includes a plurality of vertically arranged heat exchange tubes 2, the top and bottom of which are mounted in the inner cavity of the heat exchange shell 1 through heat exchange tube fixing plates 11. The structure of the heat exchange tube fixing plates 11 is shown in the attached Figure 2 The shape of the heat exchange tube fixing plate 11 is adapted to the inner cavity shape of the heat exchanger housing 1, and can be a rectangular, circular or other easily processed shape. In this embodiment, it is a rectangular structure. The heat exchange tube plug hole 11-1 is opened on the plate body of the heat exchange tube fixing plate 11 according to the preset array size, and the size of the heat exchange tube plug hole 11-1 is adapted to the outer diameter of the heat exchange tube 2. Both ends of the heat exchange tube 2 are respectively fixed in the heat exchange tube plug hole 11-1.

[0020] The carrier gas waste gas generated by the sludge dryer enters the carrier gas inlet 1-1 at the bottom of the heat exchanger shell 1 under the action of the induced draft fan, then enters the tube body of the heat exchange tube 2 from bottom to top, and finally is discharged from the carrier gas outlet 1-2. Cooling water enters from the cooling water inlet 1-3, flows through the heat exchange area from top to bottom, and exchanges heat with the high-temperature carrier gas in the heat exchange tube 2 in the heat exchange area. During the heat exchange process, the carrier gas temperature decreases, and the supersaturated water vapor in the carrier gas is precipitated and discharged through the bottom sewage pipe 6. The carrier gas with a large amount of water precipitated can reduce the carrier gas volume by about 50%, greatly saving the energy consumption of subsequent process equipment.

[0021] The heat exchange tubes are arranged in a vertical array, with the carrier gas entering from the bottom and exiting from the top. The heat exchange tubes are evenly distributed across the heat exchange area to improve the heat exchange efficiency. This is also conducive to flushing away the dust on the inner wall of the heat exchange tubes to ensure the heat exchange effect under long-term operating conditions. The flow directions of cooling water and carrier gas are set in opposite directions to ensure more sufficient heat exchange.

[0022] The flushing structure includes: a flushing nozzle 9, each heat exchange tube 2 is equipped with a flushing nozzle 9, the flushing nozzle 9 is arranged at the top of the inner cavity of the heat exchange tube 2, and the flushing nozzle 9 is connected to the water supply device of the high-pressure flushing water through the pipeline 9-1 and the control valve 3. In this embodiment, the high-pressure flushing water uses process water. The pressure difference measuring device 4 is arranged between the carrier gas inlet 1-1 and the carrier gas outlet 1-2.

[0023] A flushing nozzle 9 is provided at the top of the inner cavity of the heat exchange tube 2. In actual application, the flushing water pressure is reasonably selected to thoroughly flush the dust accumulated inside the heat exchanger. In addition, through the online pressure difference monitoring points at the head and end of the heat exchanger, a pressure difference measuring device 4 is provided at the pressure difference monitoring point, so that the dust accumulation of the heat exchanger can be detected in real time. Once dust accumulation or blockage occurs in the heat exchange tube 2, the negative air pressure of the carrier gas outlet 1-2 will increase, and the pressure difference between the carrier gas outlet 1-2 and the carrier gas inlet 1-1 will increase. Once the pressure difference is higher than the set alarm value, the flushing water control valve 3 is opened online, and a large number of flushing nozzles 9 are used to realize online instantaneous cleaning of the inner cavity of the heat exchange tube 2. Further improve the practicality of this application.

[0024] A drain port 6 is provided at the bottom of the heat exchanger housing 1, and waste water after flushing and saturated water vapor precipitated from the high-temperature carrier gas during the heat exchange process are mostly discharged from the drain port 6. In the specific configuration, the drain port 6 is provided below the carrier gas inlet 1-1.

[0025] The demister 5 is arranged at the upper part of the inner cavity of the heat exchanger shell 1, between the carrier gas outlet 1-2 and the heat exchange tube bundle 2. The demister 5 is newly added at the end of the heat exchange device in the present application, and the demister 5 adopts a condensing spiral demister. In the condensing spiral demister, the flue gas passes through the spiral flow channel, and the fine particles in the flue gas form a large centrifugal force in the spiral flow channel. Especially after the flue gas is cooled, the gaseous water in the flue gas precipitates into liquid water droplets, and covers the fine particles in the flue gas, thereby realizing the growth of fine particles and the spherization and surface smoothing of irregular particles, so that the fine particles have a greater centrifugal force, which can effectively overcome the viscosity of the flue gas on the fine particles. The surface smoothing can greatly reduce the viscosity of the flue gas on it. Compared with the baffle separator and the bundle separator of fine particles, the centrifugal force formed by it also constitutes continuity, and can rotate continuously for multiple 360 ​​degrees. The fine particles are effectively pushed to the spiral tube wall, and the tube wall rich in water film instantly annihilates the fine particles, thereby greatly improving the separation efficiency of fine particles and more thoroughly dehumidifying and demisting the carrier gas. The intercepted water vapor adheres to the surface of the demister 5. In specific applications, a nozzle can also be set above the demister 5 to regularly flush the dust-containing condensed water on the surface of the demister equipment online through the control valve 3.

[0026] The new heat exchanger process equipment used in this application can not only solve the problem of reduced heat exchange efficiency due to excessive dust in the carrier gas, but also more efficiently remove water vapor droplets in the carrier gas to ensure stable operation of the back-end process of the heat exchanger. By adding online detection function and realizing online real-time flushing function, the maintenance cycle is greatly reduced and the stability of the system is enhanced.

[0027] After using the technical solution of the utility model, the continuous operation of the heat exchanger can be guaranteed, and the heat exchange effect of the carrier gas heat exchanger can be guaranteed. The cold source uses circulating cooling water to condense the water vapor in the carrier gas through the heat exchanger and discharge it out of the heat exchanger, which can greatly reduce the volume of the carrier gas, reduce the size of the equipment selection of the subsequent processing process system, save operating costs and investment costs, and bring economic benefits to the owner.

Claims

1. An easily cleanable carrier gas heat exchange device, comprising: The heat exchanger shell and heat exchange tube bundle are characterized in that they also include: a flushing structure; The bottom of the heat exchanger shell is provided with a carrier gas inlet, the top is provided with a carrier gas outlet, and the heat exchange area is located in the inner cavity of the heat exchanger shell between the carrier gas inlet and the carrier gas outlet; the lower end of the heat exchange area is provided with a cooling water outlet, and the top is provided with a cooling water inlet; The heat exchange tube bundle is arranged inside the heat exchanger shell, and the heat exchange tubes in the tube bundle are arranged in a vertical array; the bottom port of the heat exchange tube is connected to the carrier gas inlet, and the top port is connected to the carrier gas outlet; The flushing structure includes: a flushing nozzle, each heat exchange tube is equipped with one flushing nozzle, the flushing nozzle is arranged at the top of the inner cavity of the heat exchange tube, and the flushing nozzle is connected to a water supply device for high-pressure flushing water.

2. The easily cleanable carrier gas heat exchange device according to claim 1, characterized in that: It also includes: a pressure difference measuring device, which is arranged between the carrier gas inlet and the carrier gas outlet.

3. The easily cleanable carrier gas heat exchange device according to claim 1, characterized in that: It also includes: a demister, which is arranged at the upper part of the inner cavity of the heat exchanger shell and is located between the carrier gas outlet and the heat exchange tube bundle.

4. The easily cleanable carrier gas heat exchange device according to claim 1, characterized in that: It also includes: a sewage outlet, which is arranged at the bottom of the heat exchanger shell.

Images