Transformation method for heat source replacement of steam heat exchange station

Abstract

The invention discloses a transformation method for heat source replacement of a steam heat exchange station, which comprises the following transformation steps: step 1, dismantling an original steam boiler of the steam heat exchange station, determining the heat supply power of a hot water boiler according to a heat load demand, and selecting and installing the hot water boiler with corresponding heat supply capacity; secondly, a water inlet pipeline and a water outlet pipeline of the hot water boiler are both in butt joint with a heat supply pipeline, the hot water boiler is in butt joint with a fuel supply system to form a heat supply circulation system, and a circulation water pump is installed to pump hot water out of the hot water boiler and convey the hot water into the heat supply pipeline; and thirdly, a gas collection cooling tank is arranged, and a steam heat exchanger is fixedly installed between the water inlet pipeline and the heat supply pipeline. According to the hot water boiler, heat carried by discharged steam can be fully utilized, preheating before heating of the hot water is completed, use is more energy-saving and environment-friendly, the temperature difference between the hot water guided into the hot water boiler and the hot water guided into the hot water boiler can be prevented from being too large, and the safety of the hot water boiler during working is improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction of steam-to-water projects in thermal power areas, and more specifically to a transformation method for heat source replacement in a steam heat exchange station. Background Art

[0002] The steam-to-water project in thermal power areas usually refers to the transformation of the original steam heating system into a hot water heating system. This transformation may involve multiple aspects, including but not limited to the replacement of boilers, the modification of pipelines, and the adjustment of heating stations and user ends. The replacement of boilers means the replacement of heat sources.

[0003] The transformation of the heat exchange station includes heat source replacement, pipeline system transformation, heat exchange equipment transformation, control system transformation and safety equipment transformation. The original steam heat exchange heat source mostly uses steam boilers for heating, and the steam-to-water project in the thermal power area replaces steam with hot water. Therefore, it is necessary to replace the steam filter with a hot water boiler. When the hot water boiler is in use, some steam is often generated due to insufficient internal pressure and excessive temperature. The generation of this type of steam will increase the pressure in the hot water boiler, so it is necessary to partially discharge the steam. The current discharge method is to directly discharge and then replenish water, which will result in a large amount of heat waste and loss, and the hot water boiler needs to be replenished with water frequently, which is not economical. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a method for modifying a steam heat exchange station by replacing a heat source.

[0005] In order to solve the above-mentioned background technical problems, the present invention adopts the following technical solutions.

[0006] A method for transforming a steam heat exchange station heat source replacement includes the following transformation steps:

[0007] Step 1: Dismantle the steam boiler of the original steam heat exchange station, determine the heating power of the hot water boiler according to the heat load demand, and select a hot water boiler with corresponding heating capacity for installation;

[0008] Step 2: The water inlet and outlet pipes of the hot water boiler are connected to the heating pipe, the hot water boiler is connected to the fuel supply system to form a heating circulation system, and a circulating water pump is installed to extract hot water from the hot water boiler and transport it to the heating pipe;

[0009] Step 3: Set up an air collecting cooling tank, and a steam heat exchanger is fixedly installed between the water inlet pipeline and the heating pipeline, wherein the air inlet pipe of the steam heat exchanger is fixedly connected to the air outlet pipe of the automatic exhaust valve of the hot water boiler, and the air outlet pipe of the steam heat exchanger is fixedly connected to the inlet pipe of the air collecting cooling tank;

[0010] Step 4: A reflux pipe is provided on the gas collecting cooling tank, and the other end of the reflux pipe is connected to the hot water chamber in the hot water boiler, and reflux power is provided by a water pump.

[0011] As a further description of the above technical solution:

[0012] The fuel supply system in step 2 is one of coal supply and gas supply. When gas supply is selected, a gas pipeline is laid and a gas metering pressure regulator is installed.

[0013] As a further description of the above technical solution:

[0014] In the step 2, the water outlet pipe of the hot water boiler is lower than the hot water level in the hot water boiler and is equipped with a gas filter.

[0015] As a further description of the above technical solution:

[0016] In the step 2, when the heating pipeline is replaced by a hot water boiler from a steam boiler, the corresponding heating pipeline is replaced.

[0017] As a further description of the above technical solution:

[0018] In the step three, a water supply and pressure pipe is provided on the gas collecting cooling tank, and pressure sensors are installed on both the gas collecting cooling tank and the hot water boiler.

[0019] As a further description of the above technical solution:

[0020] In the step 4, a flow meter is installed on the reflux pipe. When water flows back through the reflux pipe via the water pump, the automatic exhaust valve on the hot water boiler opens at the same time.

[0021] As a further description of the above technical solution:

[0022] The interiors of the hot water boiler and the gas collecting cooling tank are always kept in a positive pressure state.

[0023] As a further description of the above technical solution:

[0024] In the step 4, a pulse tube is fixedly installed on one end of the return pipe located inside the hot water chamber of the hot water boiler, and the pulse tube is provided with evenly distributed spray holes.

[0025] As a further description of the above technical solution:

[0026] The gap between the pulse tube and the outer wall of the furnace of the hot water boiler is 1cm-2cm, and the spray hole faces the outer wall of the furnace. A pulse booster pump is fixedly installed on the part of the return pipe located between the hot water boiler and the gas collecting cooling tank.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] This solution can make full use of the heat carried by the steam exhaust to complete the preheating of the hot water before heating, which is more energy-saving and environmentally friendly. Secondly, it can avoid excessive temperature difference between the hot water introduced and the hot water in the hot water boiler, thereby improving the safety of the hot water boiler during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the principle of the present invention;

[0030] Figure 2 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] See also Figure 1 and Figure 2 In the present invention, a method for modifying a heat source of a steam heat exchange station comprises the following modification steps:

[0033] Step 1: Dismantle the steam boiler of the original steam heat exchange station, determine the heating power of the hot water boiler according to the heat load demand, and select a hot water boiler with corresponding heating capacity for installation;

[0034] Step 2: The water inlet and outlet pipes of the hot water boiler are connected to the heating pipe, the hot water boiler is connected to the fuel supply system to form a heating circulation system, and a circulating water pump is installed to extract hot water from the hot water boiler and transport it to the heating pipe;

[0035] Step 3: Set up an air collecting cooling tank, and a steam heat exchanger is fixedly installed between the water inlet pipeline and the heating pipeline, wherein the air inlet pipe of the steam heat exchanger is fixedly connected to the air outlet pipe of the automatic exhaust valve of the hot water boiler, and the air outlet pipe of the steam heat exchanger is fixedly connected to the inlet pipe of the air collecting cooling tank;

[0036] Step 4: A reflux pipe is provided on the gas collecting cooling tank, and the other end of the reflux pipe is connected to the hot water chamber in the hot water boiler, and reflux power is provided by a water pump.

[0037] In the present invention, after the original steam boiler is replaced by the hot water boiler, it is connected to the inlet and outlet pipes of the corresponding heating pipeline and the dye supply system, and then the circulating water in the hot water boiler is heated. When the hot water boiler heats the hot water, some steam will be generated due to the working environment factors, especially a large amount of steam will be generated in the low-pressure overheating state. The excess steam is discharged in time through the automatic exhaust valve and introduced into the steam heat exchanger. The steam and the hot water are exchanged with each other in the steam heat exchanger to preheat the hot water to be added to the hot water boiler. The cooled steam enters the gas collecting cooling tank for collection and liquefaction. After liquefaction is completed, the liquefied water is introduced into the hot water boiler again through the reflux pipe through the water pump to complete the replenishment. The heat carried by the steam discharge can be fully utilized to complete the preheating before the hot water is heated, and the use is more energy-saving and environmentally friendly. Secondly, it can avoid excessive temperature difference between the introduced hot water and the hot water in the hot water boiler, thereby improving the safety of the hot water boiler during operation.

[0038] Wherein: the fuel supply system in step 2 is one of coal supply and gas supply. When gas supply is selected, a gas pipeline is laid and a gas metering pressure regulator is installed.

[0039] In the present invention, a suitable coal supply or gas supply is selected according to the convenient fuel supply mode of the heat exchange station and the environmental protection requirements.

[0040] Wherein: in step 2, the water outlet pipe of the hot water boiler is lower than the hot water level in the hot water boiler and is equipped with a gas filter.

[0041] In the present invention, the connection between the water outlet pipe and the hot water boiler can ensure that it is immersed in the hot water. When the hot water is extracted, steam is prevented from directly entering the interior of the water outlet pipe. At the same time, the gas filter can filter the small amount of gas contained in the hot water to ensure the purity of the hot water entering the heating pipeline.

[0042] Wherein: in step 2, when the heating pipeline is replaced by a hot water boiler from a steam boiler, the corresponding heating pipeline is replaced.

[0043] In the present invention, since the temperature, pressure and medium properties of water heating and steam heating are different, it is necessary to replace the pipe material, and the use of high temperature and corrosion resistant prefabricated direct buried insulation pipes will have a better effect.

[0044] Among them: in step three, a water supply and pressure pipe is arranged on the gas collecting cooling tank, and pressure sensors are installed on both the gas collecting cooling tank and the hot water boiler.

[0045] In the present invention, since there may be some losses during the hot water heating cycle, water is replenished through a water replenishment pressurized pipe, and then the hot water boiler is indirectly replenished through an air collecting cooling tank to improve safety during water replenishment. Pressurization is to avoid the generation of a large amount of steam due to the decrease in the boiling point of the hot water supply. The pressure index in the air collecting cooling tank and the hot water boiler can be monitored in real time through a pressure sensor.

[0046] Wherein: in step 4, a flow meter is installed on the return pipe, and when water flows back through the return pipe through the water pump, the automatic exhaust valve on the hot water boiler opens at the same time.

[0047] In the present invention, the flow rate in the reflux pipe is displayed by a flow meter, so as to facilitate the control of the amount of reflux water flowing back to the hot water boiler.

[0048] Among them: the interior of the hot water boiler and the gas collecting cooling tank always maintains a positive pressure state.

[0049] In the present invention, the boiling point of the hot water can be provided under the positive pressure state, so as to reduce the amount of steam generated in the hot water during the heating process.

[0050] Wherein: in the step 4, a pulse tube is fixedly installed at one end of the return pipe located inside the hot water chamber of the hot water boiler, and the pulse tube is provided with evenly distributed spray holes.

[0051] The gap between the pulse tube and the outer wall of the furnace of the hot water boiler is 1cm-2cm, and the spray hole faces the outer wall of the furnace. A pulse booster pump is fixedly installed on the part of the return pipe located between the hot water boiler and the gas collecting cooling tank.

[0052] In the present invention, the water pump and the pulse booster pump on the return pipe can transport the water in the air collecting cooling tank to the inside of the hot water boiler and form a pulsed water flow. The intermittent water flow is quickly ejected to the outside from the spray hole on the pulse tube. Since the pulse tube is close to the outer wall of the furnace of the hot water boiler, the heating surface between the combustion chamber and the hot water cavity is impacted and the flow rate of this part of the water flow is accelerated. Firstly, the scale attached to the heating surface can be cleaned and the adhesion and formation of scale can be effectively prevented, thereby ensuring the heating efficiency of the combustion chamber for the hot water supply inside the hot water cavity; secondly, the rapid water flow drives the hot water supply in the hot water cavity to flow, so as to facilitate the rapid mixing of the return water and improve the heating uniformity; in addition to the water softening equipment and filtering equipment installed in the heat exchange station, the influence of scale on the thermal conductivity of the heating surface can be further avoided through the mechanical structure.

[0053] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for transforming a steam heat exchange station heat source replacement, characterized in that: The transformation steps include: Step 1: Dismantle the steam boiler of the original steam heat exchange station, determine the heating power of the hot water boiler according to the heat load demand, and select a hot water boiler with corresponding heating capacity for installation; Step 2: The water inlet and outlet pipes of the hot water boiler are connected to the heating pipe, the hot water boiler is connected to the fuel supply system to form a heating circulation system, and a circulating water pump is installed to extract hot water from the hot water boiler and transport it to the heating pipe; Step 3: Set up an air collecting cooling tank, and a steam heat exchanger is fixedly installed between the water inlet pipeline and the heating pipeline, wherein the air inlet pipe of the steam heat exchanger is fixedly connected to the air outlet pipe of the automatic exhaust valve of the hot water boiler, and the air outlet pipe of the steam heat exchanger is fixedly connected to the inlet pipe of the air collecting cooling tank; Step 4: A reflux pipe is provided on the gas collecting cooling tank, and the other end of the reflux pipe is connected to the hot water chamber in the hot water boiler, and reflux power is provided by a water pump.

2. A method for transforming a steam heat exchange station heat source replacement according to claim 1, characterized in that: The fuel supply system in step 2 is one of coal supply and gas supply. When gas supply is selected, a gas pipeline is laid and a gas metering pressure regulator is installed.

3. A steam heat exchange station heat source replacement modification method according to claim 1, characterized in that: In the step 2, the water outlet pipe of the hot water boiler is lower than the hot water level in the hot water boiler and is equipped with a gas filter.

4. A steam heat exchange station heat source replacement modification method according to claim 1, characterized in that: In the step 2, when the heating pipeline is replaced by a hot water boiler from a steam boiler, the corresponding heating pipeline is replaced.

5. The method for heat source replacement of a steam heat exchange station according to claim 1, characterized in that: In the step three, a water supply and pressure pipe is provided on the gas collecting cooling tank, and pressure sensors are installed on both the gas collecting cooling tank and the hot water boiler.

6. A steam heat exchange station heat source replacement modification method according to claim 1, characterized in that: In the step 4, a flow meter is installed on the reflux pipe. When water flows back through the reflux pipe via the water pump, the automatic exhaust valve on the hot water boiler opens at the same time.

7. The method for heat source replacement of a steam heat exchange station according to claim 1, characterized in that: The interiors of the hot water boiler and the gas collecting cooling tank are always kept in a positive pressure state.

8. The method for heat source replacement of a steam heat exchange station according to claim 1, characterized in that: In the step 4, a pulse tube is fixedly installed on one end of the return pipe located inside the hot water chamber of the hot water boiler, and the pulse tube is provided with evenly distributed spray holes.

9. A method for heat source replacement of a steam heat exchange station according to claim 8, characterized in that: The gap between the pulse tube and the outer wall of the furnace of the hot water boiler is 1cm-2cm, and the spray hole faces the outer wall of the furnace. A pulse booster pump is fixedly installed on the part of the return pipe located between the hot water boiler and the gas collecting cooling tank.

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