Anti-splashing transformation method for slag tapping pipe of boiler

Abstract

The invention discloses an anti-splashing transformation method for a boiler slag tapping pipe. The method is applied to a smooth pipe direct-insertion slag tapping pipe. An anti-splashing device composed of a sealing plate, a sealing gasket, an elastic assembly and the like is machined and installed on a slag discharging pipe in the shutdown cold state of the boiler, after the anti-splashing device is additionally installed on the slag discharging pipe and the boiler is switched from the cold state to the hot state, the slag discharging pipe is normally inserted into an inlet of the slag cooler, and meanwhile the combination face at the inlet of the slag cooler is completely sealed through the sealing plate. And in addition, due to the fact that the device is of a non-fixed structure, the insertion depth cannot be affected.

Description

Technical Field

[0001] The invention relates to the field of boiler slag discharge, and in particular to a method for anti-splashing modification of a boiler slag lower pipe. Background Art

[0002] The circulating fluidized bed boiler is a low-pollution, environmentally friendly, clean-burning boiler that uses an in-furnace combustion desulfurization process. Through low-temperature combustion in the circulating fluidized bed, sulfides and nitrogen oxides are effectively removed, thereby greatly reducing the content of pollutants in the flue gas. Due to the energy-saving and environmentally friendly characteristics of the circulating fluidized bed, it has become increasingly popular among users in recent years. With the update of technology, the current development trend of circulating fluidized bed boilers is large-scale. The large-scale development of circulating fluidized beds directly leads to a significant increase in the amount of slag discharged from the boiler.

[0003] Due to the change in the operating conditions of the boiler between the cold and hot states, the slag pipe and the inlet of the slag cooler cannot be fixedly connected. The slag pipe of some boilers is directly inserted into the slag funnel, and requires a large amount of movement, resulting in a large connection gap between the slag outlet of the circulating fluidized bed boiler and the inlet of the slag cooler. When the slag flow rate is large, defects such as slag spraying will occur, the dust pollution at the operation site is heavy, and the splashing of leaked slag is serious.

[0004] There are many structural forms that use feed pipes and expansion joints to offset the thermal expansion of boiler slag pipes. Although this method can offset most of the thermal expansion of the slag pipe and reduce pollution problems such as slag leakage and secondary dust, the use of expansion joints has its fatal weakness, that is, when the expansion and contraction times and high-temperature ash scouring and wear exist at the same time, the service life is generally low. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of slag splashing caused by loose connection of the slag lowering pipe by improving the technology of the slag lowering pipe. A method for anti-splashing modification of the boiler slag lowering pipe is proposed.

[0006] A method for anti-splashing modification of a boiler slag pipe is applied to a bare tube directly inserted into the slag pipe; the method is characterized in that the steps are as follows:

[0007] 1) When the boiler is shut down and in cold state, a certain vertical gap is formed between the slag lowering pipe and the inlet of the slag cooler;

[0008] 2) According to the diameter of the slag lowering pipe and the slag cooler inlet, the annular sealing plate is processed; the inner diameter is slightly larger than the outer diameter of the slag lowering pipe, the outer diameter is larger than the outer diameter of the slag cooler inlet, and the thickness is smaller than the vertical gap; the annular sealing plate passes through the vertical gap and is sleeved on the slag lowering pipe;

[0009] 3) The heat-resistant soft material is used to prepare the heat-insulating sealing gasket; the heat-insulating sealing gasket is annular and has a structural size similar to that of the sealing plate, and its internal opening is sleeved on the slag lowering pipe, the inner diameter is equal to the outer diameter of the slag lowering pipe, the outer diameter is larger than the outer diameter of the slag cooler inlet, and the heat-insulating sealing gasket is smaller than the vertical gap; the heat-insulating sealing gasket passes through the vertical gap and is sleeved on the slag lowering pipe;

[0010] 4) Install and fix the thermal insulation sealing pad on the lower surface of the annular sealing plate;

[0011] 5) Install and connect the lower end of the elastic component to the upper surface of the annular sealing plate;

[0012] 6) The annular sealing plate is moved to a preset free position, and the upper end of the elastic component is used to determine the installation position on the outer wall of the lower slag pipe; and the upper end of the elastic component is fixedly connected to the installation position;

[0013] 7) A protective ring is further installed on the lower slag pipe, and the protective ring is located below the annular sealing plate.

[0014] The beneficial effects of the present invention are:

[0015] Compared with the existing technology, after the transformation, the insertion depth of the slag pipe is not affected by the expansion amount, the spring compression ensures that the joint surface is firmly sealed, and the slag pipe protective ring prevents the sealing plate from falling off in the cold state. After the one-time installation is completed, no subsequent adjustment is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the structural diagram of the splash protection device.

[0017] Figure 2 The process flow for slag pipe transformation is as follows:

[0018] In the figure: 1 boiler furnace wall, 2 slag lowering pipe, 3 slag cooler inlet, 4 elastic component, 5 sealing plate, 6 protective ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] A slag cooler inlet splash prevention device comprises a slag lowering pipe, a sealing plate and an elastic component.

[0021] The slag lower pipe is installed below the boiler wall, and the lower part of the slag lower pipe corresponds to the inlet of the slag cooler.

[0022] After the boiler is started and expands due to heat, the slag lowering pipe can expand and extend into the inlet of the slag cooler.

[0023] The sealing plate is an annular component with an internal opening that is sleeved on the slag lower pipe. The inner diameter is slightly larger than the outer diameter of the slag lower pipe due to thermal expansion of the slag lower pipe, and the outer diameter is larger than the outer diameter of the slag lower pipe due to complete coverage of the slag cooler inlet when the slag lower pipe extends into the inlet of the slag cooler.

[0024] A heat-insulating sealing pad is arranged under the sealing plate and is made of a heat-resistant soft material, such as asbestos.

[0025] The heat insulating sealing gasket is also annular and has a similar structural size to the sealing plate.

[0026] The sealing plate is provided with mounting through holes evenly distributed along the circumference for passing mounting bolts.

[0027] After the mounting bolts pass through the heat-insulating seal pad, they pass through the mounting holes on the sealing plate and are fastened in place with nuts.

[0028] The elastic component can be a leaf spring or a columnar spring, and the lower end of the elastic component is connected to the sealing plate.

[0029] The upper surface of the sealing plate is evenly provided with positioning and connecting columns along the circumference, which are used for positioning and connecting the elastic component.

[0030] The positioning connection column can be a stud, which is screwed into the mounting countersunk hole on the upper surface of the annular sealing plate, and the stud cooperates with the nut to connect with the elastic component.

[0031] The positioning connection column and the elastic component can also be connected by welding.

[0032] In specific applications, the mounting bolts can be used as positioning connecting columns. The length of the mounting bolts is such that after the thermal insulation sealing pad is tightened and positioned with the nuts, they still have a certain protruding length above. They can be further used as positioning connecting columns to install and connect elastic components, and nuts or welding are used to connect the elastic components.

[0033] There is also a protection ring installed at the bottom of the slag pipe. Its outer diameter is slightly larger than the inner diameter of the sealing plate, so that the sealing plate can be spatially limited so that the sealing plate will not fall off the slag pipe when the boiler is cold. Its outer diameter is smaller than the inner diameter of the slag cooler inlet, which will not affect the expansion of the slag pipe into the slag cooler inlet.

[0034] The protective ring is fixed to the end of the slag pipe by welding, or is sleeved on the outer wall of the slag pipe for welding and fixing. Sleeving on the outer wall of the slag pipe can prevent the high-temperature slag from contacting the protective ring when it is discharged, thereby preventing the high-temperature slag from causing physical and chemical damage to the protective ring.

[0035] Furthermore, a fixed connection block can be welded on the upper end of the slag lowering pipe, the number and installation position of the connection block correspond to the positioning connection column, the upper end of the elastic component is connected to the connection block, and the lower end is connected to the sealing plate. The sealing plate uses the tension of the elastic component to keep the relative position fixed.

[0036] After the anti-splash device is installed on the slag pipe, the slag pipe can be normally inserted into the entrance of the slag cooler after the boiler is switched from cold to hot. At the same time, the joint surface at the entrance of the slag cooler is completely sealed by the sealing plate to effectively prevent slag leakage. And because the device is not a fixed structure, it will not affect the insertion depth.

[0037] In the specific implementation, when the existing light tube is directly inserted into the slag pipe for transformation, the method and steps are as follows:

[0038] 1) When the boiler is shut down and in a cold state, a certain vertical gap is formed between the slag lower pipe and the inlet of the slag cooler, and the gap size is about 6-10CM.

[0039] 2) According to the diameter of the slag pipe and the slag cooler inlet, the annular sealing plate is processed. Its internal opening is sleeved on the slag pipe, and its inner diameter is slightly larger than the outer diameter of the slag pipe, taking into account the thermal expansion of the slag pipe, and the inner diameter is slightly larger than the outer diameter of the slag pipe by 5CM.

[0040] Its outer diameter is considered to completely cover the inlet of the slag cooler when the lower slag pipe extends into the inlet of the slag cooler, and its outer diameter is 10CM larger than the outer diameter of the inlet of the slag cooler.

[0041] The annular sealing plate is evenly processed with installation holes. The thickness of the annular sealing plate can be 5CM, and it can pass through the gap between the slag lower pipe and the slag cooler inlet and be sleeved on the slag lower pipe.

[0042] 3) Use heat-resistant soft material to prepare the heat insulation seal, which can be asbestos. The heat insulation seal is annular and has similar structural dimensions to the sealing plate. Its internal opening is sleeved on the lower slag pipe, and its inner diameter is equal to the outer diameter of the lower slag pipe; its outer diameter is considered to completely cover the entrance of the slag cooler when the lower slag pipe extends into the entrance of the slag cooler, and its outer diameter is 15CM larger than the outer diameter of the entrance of the slag cooler. The thickness of the heat insulation seal can be 3CM, and it can pass through the gap between the lower slag pipe and the entrance of the slag cooler, and also sleeved on the lower slag pipe.

[0043] 4) Use the mounting bolts to pass the thermal insulation sealing gasket through the mounting through hole on the annular sealing plate, tighten and fix it with the matching nut, and install the thermal insulation sealing gasket on the lower surface of the annular sealing plate.

[0044] 5) After being tightened, the mounting bolts extend beyond the upper surface of the annular sealing plate, and nuts may be added to the mounting bolts to further connect the lower end of the elastic component, or the lower end of the elastic component may be welded to the mounting bolts.

[0045] 6) Determine the height position of the joint surface where the slag lower pipe extends into the entrance of the slag cooler after thermal expansion, and move the annular sealing plate to a free position, which is lower than the height position of the joint surface. The free position can be set 5CM lower than the height position of the joint surface.

[0046] After the annular sealing plate moves to the free position, the upper end of the elastic component connected thereto is used to further determine the installation position of the upper fixed connection block on the outer wall of the lower slag pipe. The fixed connection block is welded at the installation position, and the upper end of the elastic component is welded to the fixed connection block.

[0047] The annular sealing plate is hoisted on the fixed connection block through an elastic component and is in a free hanging state.

[0048] 7) Install a protective ring.

[0049] The outer diameter of the protection ring is smaller than the inner diameter of the slag cooler inlet.

[0050] The inner diameter of the protective ring is equal to the outer diameter of the lower slag pipe of the slag cooler. It is sleeved on the outer wall of the lower slag pipe and fixed by welding. Its installation position is lower than the free position of the annular sealing plate, lower than 5CM.

[0051] Or the inner diameter of the protective ring is equal to the inner diameter of the lower slag pipe of the slag cooler, and it is fixed to the end of the lower slag pipe by welding.

[0052] 8) When the boiler starts the hot machine and switches from the cold state to the hot state, the lower slag pipe expands and stretches normally and is inserted into the entrance of the slag cooler. At the same time, under the elastic force of the elastic component, the sealing plate presses the entrance of the slag cooler, and the sealing plate completely seals the joint surface at the entrance of the slag cooler.

[0053] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for anti-splashing modification of a boiler slag pipe, which is applied to a bare tube directly inserted into the slag pipe; it is characterized by: The steps are as follows: 1) When the boiler is shut down and in cold state, a certain vertical gap is formed between the slag lowering pipe and the inlet of the slag cooler; 2) According to the diameter of the slag lowering pipe and the slag cooler inlet, the annular sealing plate is processed; the inner diameter is slightly larger than the outer diameter of the slag lowering pipe, the outer diameter is larger than the outer diameter of the slag cooler inlet, and the thickness is smaller than the vertical gap; the annular sealing plate passes through the vertical gap and is sleeved on the slag lowering pipe; 3) The heat-resistant soft material is used to prepare the heat-insulating sealing gasket; the heat-insulating sealing gasket is annular and has a structural size similar to that of the sealing plate, and its internal opening is sleeved on the slag lower pipe, the inner diameter is equal to the outer diameter of the slag lower pipe, the outer diameter is larger than the outer diameter of the slag cooler inlet, and the heat-insulating sealing gasket is smaller than the vertical gap; the heat-insulating sealing gasket passes through the vertical gap and is sleeved on the slag lower pipe; 4) Install and fix the thermal insulation sealing pad on the lower surface of the annular sealing plate; 5) Install and connect the lower end of the elastic component to the upper surface of the annular sealing plate; 6) The annular sealing plate is moved to a preset free position, and the upper end of the elastic component is used to determine the installation position on the outer wall of the lower slag pipe; and the upper end of the elastic component is fixedly connected to the installation position; 7) A protective ring is further installed on the lower slag pipe, and the protective ring is located below the annular sealing plate.

2. A method for anti-splashing modification of a boiler lower slag pipe according to claim 1, characterized in that: In step 3), the annular sealing plate is evenly processed with mounting holes; in step 4), the thermal insulation sealing gasket is passed through with mounting bolts, and continues to pass through the mounting holes on the annular sealing plate, and is tightened and fixed by matching nuts to install the thermal insulation sealing gasket on the lower surface of the annular sealing plate.

3. A method for anti-splashing modification of a boiler lower slag pipe according to claim 2, characterized in that: In step 5), the tightened mounting bolts extend beyond the upper surface of the annular sealing plate, and the protruding portions of the mounting bolts serve as positioning connecting columns for connecting the lower end of the elastic component.

4. A method for remodeling a boiler slag pipe to prevent splashing according to claim 3, characterized in that: In step 5), the lower end of the elastic component is further connected by adding nuts to the mounting bolts, or the lower end of the elastic component is welded to the mounting bolts.

5. A boiler slag pipe splash prevention modification method according to claim 1, characterized in that: In step 3), positioning and connecting posts are evenly distributed along the circumference of the upper surface of the annular sealing plate; in step 5), the positioning and connecting posts are used to position and connect the elastic components.

6. A method for anti-splashing modification of a boiler lower slag pipe according to claim 5, characterized in that: The positioning connection column can be a stud, which is screwed into the mounting countersunk hole on the upper surface of the annular sealing plate; the stud cooperates with the nut to connect with the elastic component, or the positioning connection column and the elastic component are connected by welding.

7. A method for remodeling a boiler slag pipe to prevent splashing according to claim 1, characterized in that: In step 6), first determine the height position of the joint surface where the slag lower pipe extends into the inlet of the slag cooler after thermal expansion, and move the annular sealing plate to a preset free position, which is lower than the height position of the joint surface.

8. The method for anti-splashing modification of a boiler slag pipe according to claim 1, characterized in that: In step 6), a fixed connection block is welded at the installation position on the outer wall of the lower slag pipe, and the upper end of the elastic component is welded to the fixed connection block.

9. A method for modifying a boiler slag pipe to prevent splashing according to claim 1, characterized in that: In step 7), the outer diameter of the protection ring is smaller than the inner diameter of the slag cooler inlet, and the thickness is smaller than the vertical gap.

10. A boiler slag pipe splash prevention modification method according to claim 9, characterized in that: In step 7), the inner diameter of the protective ring is equal to the outer diameter of the lower slag pipe of the slag cooler, and the protective ring is sleeved on the outer wall of the lower slag pipe for welding and fixing, and the installation position thereof is lower than the free position of the annular sealing plate; Or the inner diameter of the protective ring is equal to the inner diameter of the lower slag pipe of the slag cooler, and it is fixed to the end of the lower slag pipe by welding.

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