Closed water spraying dust removal system

Abstract

The utility model relates to a closed water spraying dust removal system which comprises a tail gas feeding pipeline, a spraying chamber, a spraying head, a clean water tank, a sewage tank, a middle pipeline, a fan assembly and a chimney. The top wall of the spraying chamber is provided with a pore channel structure for a tail gas feeding pipeline to vertically and downwards extend into a chamber cavity of the spraying chamber, and the tail gas feeding pipeline extends into the middle lower part of the chamber cavity; and a tail gas exhaust port connected with the middle pipeline is formed in the upper end of the side wall of the spraying chamber. The spray header is cylindrical, a plurality of nozzles are distributed on the side wall of the spray header, and the spray header is vertically arranged at the lower part of a pipe cavity of a section of tail gas feeding pipeline extending into the spray chamber. A water supply pipe is arranged at the lower end of the spraying head, and the free end of the water supply pipe extends out of the spraying chamber. The water purification tank is connected with the water supply pipe, so that the purpose of conveying water in the water purification tank to the spray header can be achieved. And the sewage tank is communicated with the lower part of the chamber cavity of the spraying chamber through a pipeline. Compared with an existing tail gas dust removal mode, the tail gas dust removal efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas rotary furnace tail gas treatment, in particular to a closed water spray dust removal system. Background Art

[0002] The natural gas rotary furnace will produce high-temperature and high-humidity exhaust gas containing a large amount of smoke and dust during operation. Therefore, a special exhaust gas treatment system is required to ensure that the exhaust gas discharged through the chimney meets the emission requirements. In the existing rotary furnace exhaust gas treatment system, the smoke and dust in the exhaust gas are mostly removed by bag dust collectors. Because the exhaust gas of the natural gas rotary furnace contains a large amount of high-temperature water vapor generated when natural gas is burned, when the water vapor contacts the bag dust collector, it will condense into water on the bag, which is easy to make the water adhere to the smoke and dust attached to the bag, and the permeability of the dust bag is simulated, so that the dust removal capacity of the bag dust collector is significantly reduced. If it is not handled in time, it may even cause the dust bag to be blocked and the exhaust gas to reflux. In addition, the exhaust gas temperature of the natural gas rotary furnace is generally higher than 200°C. The ultra-high smoke temperature is also easy to damage the dust bag, which will increase the operating cost and reduce the production efficiency. Utility Model Content

[0003] In order to overcome the problems existing in the operation of the existing natural gas rotary furnace exhaust gas recovery system, the utility model provides a closed water spray dust removal system, which, after being used in the exhaust gas treatment system of the natural gas rotary furnace, can effectively treat the smoke contained in the exhaust gas and reduce the temperature of the smoke, which helps to improve the exhaust gas dust removal efficiency.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a closed water spray dust removal system, comprising:

[0005] The tail gas is sent into a pipeline and connected to the tail gas discharge port of the natural gas rotary furnace;

[0006] The spray chamber has a top wall provided with a channel structure for the tail gas delivery pipe to extend vertically downward into the chamber cavity of the spray chamber, and the tail gas delivery pipe is extended to the lower middle position of the chamber cavity of the spray chamber; the upper end of the side wall of the spray chamber is provided with a tail gas discharge port connected with the chamber cavity;

[0007] The spray head is cylindrical and has a plurality of nozzles distributed on the side wall, and is vertically arranged at the lower part of the tube cavity of a section of the tail gas delivery pipe extending into the chamber cavity of the spray chamber; a water supply pipe is arranged at the lower end of the spray head, and the free end of the water supply pipe extends out of the spray chamber;

[0008] A clean water tank is connected to the free end of the water supply pipe and a water pump is provided on the water supply pipe to deliver the water in the clean water tank to the sprinkler head;

[0009] A sewage tank is connected to the lower end of the chamber cavity of the spray chamber through a pipeline, and can discharge sewage mixed with smoke and harmful gases in exhaust gas from the lower part of the chamber cavity of the spray chamber to the sewage tank;

[0010] And an intermediate pipeline, a fan assembly and a chimney; the upper end of the intermediate pipeline is connected to the exhaust gas outlet arranged on the spray chamber, and the lower end is connected to the air inlet end of the fan assembly; the exhaust end of the fan assembly is connected to the chimney through a pipeline.

[0011] Starting the fan assembly can extract the exhaust gas collected in the upper part of the chamber cavity of the spray chamber through the intermediate pipe, and transport it to the chimney, and finally complete the discharge through the chimney.

[0012] Optionally, a condenser assembly matching the vertically arranged section of the intermediate pipe is also included. The condenser assembly includes a condenser tube group and a water collection part, the condenser tube group includes a plurality of condenser tubes and a supporting connecting rod fixedly connected to the condenser tubes, and the water collection part includes a bottom trough and a water collection box.

[0013] The supporting connecting rod is connected to the intermediate pipe, so that the condenser pipe can be suspended in the tube cavity of the intermediate pipe.

[0014] The bottom trough is fixed in the tube cavity of the middle pipe and the upper port of the bottom trough is directly opposite to the bottom of all condensation tubes, so that the water drops condensed on the tube wall of the condensation tube can fall into the groove cavity of the bottom trough.

[0015] A channel gap is formed between the bottom trough and the intermediate pipe, so that the exhaust gas can pass through the condenser pipe group and the tube cavity area of ​​the intermediate pipe at the corresponding position of the bottom trough, and then continue to flow toward the fan assembly.

[0016] The water collecting box is annular and is mounted on the outside of the intermediate pipe. A plurality of connecting pipes are arranged alternately around the circumference of the wall of the intermediate pipe. One end of the connecting pipe is connected to the lower part of the groove cavity of the bottom trough, and the other end is inclined upward and connected to the middle part of the box cavity of the water collecting box. The end of the connecting pipe extending into the groove cavity of the bottom trough is always kept in a water-sealed state. A drainage pipe connected to the clean water tank is arranged at the upper part of the box cavity of the water collecting box.

[0017] The bottom trough and the water collecting tank are connected through the connecting pipe, so that the condensed water collected in the bottom trough can flow into the box cavity of the water collecting tank through the connecting pipe, and after the condensed water collected in the water collecting tank reaches a certain amount, it can flow into the clean water tank through the drain pipe.

[0018] Optionally, a flow blocking assembly is also included. The flow blocking assembly includes an annular groove formed on the inner wall of the spray chamber, a first conical ring sleeve and a second conical ring sleeve.

[0019] The constricted end of the first conical ring sleeve is fixedly connected to the outer wall of the exhaust gas delivery pipe extending into the spray chamber, and the flared end faces upward and is a free end. The outer edge of the upper end of the first conical ring sleeve is relatively located below the annular groove, and a radial gap is formed between the outer edge of the upper end of the first conical ring sleeve and the inner wall surface of the spray chamber.

[0020] The expanded end of the second conical ring sleeve is fixedly connected to the inner wall of the spray chamber, and the contracted end faces downward and is a free end.

[0021] The inner edge of the lower end of the second conical ring sleeve is relatively located below the annular groove, and a radial gap is formed between the inner edge of the lower end of the second conical ring sleeve and the outer wall of the exhaust gas delivery pipe.

[0022] Optionally, the upper end surface of the annular groove is inclined upward, and the lower end surface is inclined downward, so that the groove cross-section of the annular groove is V-shaped or trapezoidal.

[0023] Optionally, a multi-layer medium cavity is formed at least on the wall of the first conical ring sleeve or on the wall of the second conical ring sleeve. The medium cavity near the exhaust gas inlet pipe is connected to the medium discharge pipe, and the medium cavity near the spray chamber is connected to the medium inlet pipe, so as to achieve the purpose of cooling the rising exhaust gas by means of the first conical ring sleeve and / or the second conical ring sleeve, which can reduce the humidity of the exhaust gas entering the intermediate pipe on the one hand, and recover the heat of the exhaust gas on the other hand.

[0024] The beneficial effects of the utility model are: after being used in the tail gas treatment system of the natural gas rotary furnace, the patent can effectively treat the smoke and harmful substances contained in the tail gas and reduce the temperature of the smoke, which helps to improve the efficiency of tail gas dust removal and reduce operating costs. Compared with the existing tail gas dust removal methods, it has the advantages of being relatively more efficient, more energy-saving and environmentally friendly, and helps to make the treated tail gas meet better emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of embodiment 1.

[0026] Figure 2 This is a structural diagram of embodiment 2.

[0027] Figure 3 It is a schematic diagram of the top view of the structure of the first conical ring sleeve in the second embodiment.

[0028] Figure 4 It is a schematic diagram of the top view of the second conical ring sleeve in the second embodiment.

[0029] Figure 5It is a schematic diagram of the structure of the matching of the water collecting part and the condensing tube group in the second embodiment.

[0030] In the figure: 10 exhaust gas delivery pipeline; 20 spray chamber; 30 spray head; 40 clean water tank; 50 sewage tank; 60 intermediate pipeline; 70 fan assembly; 80 chimney;

[0031] 90 condensate assembly, 91 condenser pipe group, 911 condenser pipe, 912 supporting connecting rod, 92 water collecting part, 921 bottom trough, 922 water collecting tank, 923 connecting pipe, 924 drain pipe;

[0032] 100 choke assembly, 101 annular groove, 102 first conical ring sleeve, 1021 conical ring groove 1, 1022 upper end outer edge, 103 second conical ring sleeve, 1031 conical ring groove 2, 1032 lower end inner edge. DETAILED DESCRIPTION

[0033] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0034] Embodiment 1: Figure 1 A closed water spray dust removal system shown includes an exhaust gas supply pipe 10, a spray chamber 20, a spray head 30, a clean water tank 40, a sewage tank 50, an intermediate pipe 60, a fan assembly 70 and a chimney 80. One end of the exhaust gas supply pipe 10 is connected to the exhaust gas discharge port of the natural gas rotary furnace. The lower end of the intermediate pipe 60 is connected to the air inlet end of the fan assembly 70. The exhaust end of the fan assembly 70 is connected to the chimney 80 through a pipe. The exhaust gas supply pipe 10, the intermediate pipe 60, the fan assembly 70 and the chimney 80 can all be set with reference to the existing technology, so they are not repeated here.

[0035] A channel structure is provided on the top wall of the spray chamber 20 for the other end of the exhaust gas delivery pipe 10 to extend vertically downward into the chamber cavity of the spray chamber 20, and the port of the exhaust gas delivery pipe 10 extends into the lower middle position of the chamber cavity of the spray chamber 20. An exhaust gas outlet communicating with the chamber cavity is provided on the upper part of the side wall of the spray chamber 20. The upper end of the intermediate pipe 60 is connected to the exhaust gas outlet provided on the spray chamber 20.

[0036] The spray head 30 is cylindrical and has a plurality of nozzles distributed on the side wall of the spray head 30, so that the spray head 30 can spray out a jet that diverges radially outward. The nozzles are distributed in multiple layers along the axial direction of the spray head 30, and each layer contains a plurality of nozzles distributed alternately around the circumference. The spray head 30 is vertically arranged at the lower part of the tube cavity of a section of the exhaust gas delivery pipe 10 extending into the chamber cavity of the spray chamber 20. A water supply pipe is provided at the lower end of the spray head 30, and the free end of the water supply pipe extends out of the spray chamber 20.

[0037] In order to improve the dust removal efficiency and thoroughness, a plurality of branch pipes can be distributed at one end of the exhaust gas delivery pipe 10 that matches the spray chamber 20, and each branch pipe extends vertically downward into the chamber cavity of the spray chamber 20. At the same time, a spray head 30 is respectively arranged at the lower part of the tube cavity of the branch pipe, and each spray head 30 is connected to a water supply pipe.

[0038] The tail gas discharged from the natural gas rotary furnace is sent to the spray chamber 20 through the tail gas delivery pipe 10, and is combined with the jet sprayed by the spray head 30 arranged at the lower end of the tail gas delivery pipe 10 to mix and form sewage. The sewage flows into the sewage tank 50 (mentioned below) by gravity to achieve dust removal and cooling effects. The dust-removed tail gas / smoke is transported to the chimney 80 for discharge through the fan assembly 70, thereby completing the entire dust removal and smoke exhaust work.

[0039] The clean water tank 40 is connected to the free end of the water supply pipe and a water pump is provided on the water supply pipe to achieve the purpose of sending the water in the clean water tank 40 to the spray head 30, and multiple jets are sprayed out of the periphery of the spray head 30 to form a water curtain to fully contact with the smoke and harmful gases contained in the exhaust gas and mix to form sewage. The sewage tank 50 is connected to the lower end of the chamber cavity of the spray chamber 20 through a pipeline, and the sewage mixed with smoke and dissolved harmful gases can be discharged from the lower part of the chamber cavity of the spray chamber 20 to the sewage tank 50.

[0040] Starting the fan assembly 70 can extract the exhaust gas / smoke collected in the upper part of the chamber cavity of the spray chamber 20 through the intermediate pipe 60 and transport it to the chimney 80, and finally complete the discharge through the chimney 80.

[0041] Embodiment 2: Figures 2 to 5 As shown, the main difference between this embodiment and the above-mentioned embodiment is that the technical features of the condensation assembly 90 and the flow blocking assembly 100 are added.

[0042] The condensate assembly 90 is correspondingly arranged on the vertical section of the intermediate pipe 60 , and includes a condensation pipe group 91 and a water collecting portion 92 .

[0043] The condenser tube group 91 includes a plurality of condenser tubes 911 and a supporting connecting rod 912 fixedly connected to the condenser tubes 911. The supporting connecting rod 912 is connected to the tube wall of the intermediate pipe 60, so that all the condenser tubes 911 can be suspended in the tube cavity of the intermediate pipe 60 at the same time, and radial spacing is formed between adjacent condenser tubes 911.

[0044] The water collecting part 92 includes a bottom groove 921 and a ring-shaped water collecting box 922. The bottom groove 921 is fixed in the tube cavity of the intermediate pipe 60 and the upper end of the bottom groove 921 is directly opposite to the bottom of all condensing pipes 911, so that the water droplets condensed on the tube wall of the condensing pipe 911 can fall into the groove cavity of the bottom groove 921. A channel gap is formed between the bottom groove 921 and the intermediate pipe 60, so that the exhaust gas can pass through the tube cavity area of ​​the intermediate pipe 60 at the corresponding position of the condensing pipe group 91 and the bottom groove 921, and continue to flow toward the fan assembly 70.

[0045] The water collecting box 922 is mounted on the outside of the intermediate pipe 60. A plurality of connecting pipes 923 are arranged alternately around the circumference on the wall of the intermediate pipe 60. One end of the connecting pipe 923 is connected to the lower part of the groove cavity of the bottom groove 921, and the other end is connected to the lower part of the box cavity of the water collecting box 922. The end of the connecting pipe 923 extending into the groove cavity of the bottom groove 921 is always kept in a water-sealed state. A drain pipe 924 connected to the clean water tank 40 is arranged at the upper part of the box cavity of the water collecting box 922. The condensed water collected in the bottom groove 921 can flow into the box cavity of the water collecting box 922 through the connecting pipe 923, and after the condensed water collected in the water collecting box 922 reaches a certain amount, it can flow into the clean water tank 40 through the drain pipe 924.

[0046] The heat exchange piping system that is connected to the condenser 911 of the condenser pipe group 91 in the condenser assembly 90 is not shown in the figure. The annular wall of the condenser pipe 911 is a hollow wall, and a circulating heat exchange medium is installed in the hollow wall cavity to condense the water vapor in the flue gas on the pipe wall of the condenser pipe 911, and the water vapor falls down along the pipe wall into the bottom groove 921, and finally flows into the water collecting tank 922 through the connecting pipe 923, and can flow back to the clean water tank 40. The exhaust gas after condensation and drying can continue to flow downward through the gap formed between the bottom groove 921 and the intermediate pipe 60, and finally is sent into the chimney 80 by the fan assembly 70 and discharged.

[0047] The choke assembly 100 includes an annular groove 101 formed on the inner wall of the spray chamber 20 , and a first conical ring sleeve 102 and a second conical ring sleeve 103 disposed in the chamber cavity of the spray chamber 20 .

[0048] The constricted end of the first conical ring sleeve 102 is fixedly connected to the outer wall of the exhaust gas delivery pipe 10 extending into the spray chamber 20, and the flared end faces upward and is a free end. A channel gap may be formed between the constricted end of the first conical ring sleeve 102 and the outer wall of the exhaust gas delivery pipe 10. The upper outer edge 1022 of the first conical ring sleeve 102 is relatively located below the annular groove 101, and a radial gap is formed between the upper outer edge 1022 of the first conical ring sleeve 102 and the inner wall surface of the spray chamber 20.

[0049] The flared end of the second conical ring sleeve 103 is fixedly connected to the inner wall of the spray chamber 20, and the narrowed end faces downward and is a free end. The inner edge 1032 of the lower end of the second conical ring sleeve 103 is relatively located below the annular groove 101, and a radial gap is formed between the inner edge of the lower end of the second conical ring sleeve 103 and the outer wall of the exhaust gas delivery pipe 10.

[0050] The upper end surface of the annular groove 101 is inclined upward, and the lower end surface is inclined downward, so that the groove cross section of the annular groove 101 has a trapezoidal structure.

[0051] The constricted end of the first conical ring sleeve 102 is located above the lower end of the exhaust gas delivery pipe 10 and a certain height difference is formed between the two.

[0052] After the exhaust gas enters the spray chamber 20 through the exhaust gas delivery pipe 10 and combines with the water jet, the flow rate will be blocked and reduced during the upward flow process, which will increase the pressure of the exhaust gas in the spray chamber 20 and easily cause a large amount of water vapor contained in the exhaust gas to condense and drip into the spray chamber, thereby reducing the water vapor content in the rising exhaust gas.

[0053] In order to further improve the humidity condition of the exhaust gas flowing upward in the chamber of the spray chamber 20, a double-layer medium cavity is formed at least on the wall of the first conical ring sleeve 102 or on the wall of the second conical ring sleeve 103, and a connection relationship is established between the connecting positions of the two layers of medium cavities. The medium cavity close to the side of the exhaust gas delivery pipe 10 (i.e., the side close to the conical ring groove 1 1021 on the first conical ring sleeve 102, and the side close to the conical ring groove 2 1031 on the second conical ring sleeve 103) is connected to the medium discharge pipe, and the medium cavity close to the side of the spray chamber 20 is connected to the medium delivery pipe, so as to achieve the purpose of cooling the rising exhaust gas by means of the first conical ring sleeve 102 and / or the second conical ring sleeve 103, which can reduce the humidity of the exhaust gas entering the intermediate pipe 60 on the one hand, and recover the heat carried by the exhaust gas on the other hand.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical concept disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A closed water spray dust removal system, comprising an exhaust gas inlet pipe, an intermediate pipe, a fan assembly and a chimney; one end of the exhaust gas inlet pipe is connected to the exhaust gas discharge port of the natural gas rotary furnace; one end of the intermediate pipe is connected to the air inlet end of the fan assembly; the exhaust end of the fan assembly is connected to the chimney through a pipe; characterized in that, Also includes: The spray chamber has a top wall provided with a channel structure for allowing the other end of the exhaust gas delivery pipe to extend vertically downward to the chamber cavity and allowing the exhaust gas delivery pipe to extend to the middle and lower part of the chamber cavity; an exhaust gas outlet connected to the other end of the intermediate pipe is provided at the upper end of the side wall of the spray chamber; The spray head is cylindrical and has a plurality of nozzles distributed on the side wall, and is vertically arranged at the lower part of the tube cavity of a section of the tail gas delivery pipe extending into the spray chamber; a water supply pipe is arranged at the lower end of the spray head, and the free end of the water supply pipe extends out of the spray chamber; A clean water tank is connected to the free end of the water supply pipe and a water pump is provided on the water supply pipe to deliver the water in the clean water tank to the sprinkler head; and a sewage tank which is connected with the lower part of the chamber cavity of the spray chamber through a pipeline.

2. A closed water spray dust removal system according to claim 1, characterized in that: It also includes a condenser assembly matched with the vertically arranged section of the intermediate pipe; the condenser assembly includes a condenser tube group and a water collecting part, the condenser tube group includes a plurality of condenser tubes and a supporting connecting rod fixedly connected to the condenser tubes, and the water collecting part includes a bottom trough and a water collecting tank; The supporting connecting rod is connected to the intermediate pipe, so that the condenser pipe can be suspended in the tube cavity of the intermediate pipe; The bottom trough is fixed in the tube cavity of the middle pipe and the upper port of the bottom trough corresponds to the lower side of the condenser pipe, so that the condensed water condensed on the tube wall of the condenser pipe can fall into the bottom trough; a channel gap is formed between the bottom trough and the middle pipe; The water collecting tank is in the shape of a ring and is mounted on the outside of the intermediate pipe; a plurality of connecting pipes are arranged alternately around the circumference on the wall of the intermediate pipe; one end of the connecting pipe is connected to the lower part of the trough cavity of the bottom trough, and the other end is tilted upward and connected to the middle part of the box cavity of the water collecting tank; the end of the connecting pipe extending into the bottom trough is always kept in a water-sealed state; a drainage pipe connected to the clean water tank is arranged in the upper part of the box cavity of the water collecting tank.

3. A closed water spray dust removal system according to claim 1 or 2, characterized in that: It also includes a flow-blocking assembly; the flow-blocking assembly includes an annular groove, a first conical ring sleeve and a second conical ring sleeve formed on the inner wall of the spray chamber; The constricted end of the first conical ring sleeve is fixedly connected to the outer wall of the exhaust gas inlet pipe extending into the spray chamber, and the flared end faces upward and is a free end; the outer edge of the upper end of the first conical ring sleeve is relatively located below the annular groove, and a radial gap is formed between the outer edge of the upper end of the first conical ring sleeve and the inner wall surface of the spray chamber; The flared end of the second conical ring sleeve is fixedly connected to the inner wall of the spray chamber, and the narrowed end faces downward and is a free end; the inner edge of the lower end of the second conical ring sleeve is relatively located below the annular groove and a radial gap is formed between the inner edge of the lower end of the second conical ring sleeve and the outer wall of the exhaust gas inlet pipe.

4. A closed water spray dust removal system according to claim 3, characterized in that: The upper end surface of the annular groove is inclined upward, and the lower end surface is inclined downward, so that the groove cross section of the annular groove is V-shaped or trapezoidal.

5. A closed water spray dust removal system according to claim 4, characterized in that: At least two layers of interconnected medium cavities are formed on the wall of the first conical ring sleeve or on the wall of the second conical ring sleeve; the medium cavity close to the exhaust gas supply pipe is connected to the discharge pipe, and the medium cavity close to the spray chamber is connected to the supply pipe to achieve the purpose of cooling the exhaust gas.

6. A closed water spray dust removal system according to claim 3, characterized in that: At least two layers of interconnected medium cavities are formed on the wall of the first conical ring sleeve or on the wall of the second conical ring sleeve; the medium cavity close to the exhaust gas supply pipe is connected to the discharge pipe, and the medium cavity close to the spray chamber is connected to the supply pipe to achieve the purpose of cooling the exhaust gas.

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