Isothermal methanation ORC turbine power generation device

Abstract

The utility model belongs to the technical field of synthesis gas methanation reaction waste heat utilization and production operation of chemical engineering devices, and particularly relates to an isothermal methanation ORC turbine power generation device. The device comprises a 1 # heater, a 1 # isothermal methanation furnace, a 2 # heater, a 2 # isothermal methanation furnace, an ORC turbine power generation system and a plurality of pipelines, reaction heat of the isothermal methanation furnaces can be effectively utilized to heat boiler water for byproduct electric energy, the problems of energy waste and the like caused by the fact that byproduct saturated steam is difficult to merge into a steam pipe network are avoided, and the operation benefits of the device are improved.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization and production operation technology of syngas methanation reaction in chemical plants, specifically relating to an isothermal methanation ORC turbine power generation device. Background Technology

[0002] In syngas methanation units, the reaction heat generated by the isothermal methanation furnace, at a temperature of approximately 250–280°C, is considered a low- to medium-grade heat source. In traditional processes, this heat is typically recovered and utilized as a byproduct of 6.0 MPa high-pressure boiler water, producing 2.0–2.5 MPa low- to medium-pressure saturated steam.

[0003] The main drawbacks of the above process and equipment are that they consume a large amount of boiler feedwater to produce medium and low pressure saturated steam. Moreover, since the saturated steam cannot be directly connected to the steam network, a steam superheater is required, resulting in high energy consumption. Sometimes, excess steam that cannot be balanced needs to be vented, causing a great waste of energy. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an isothermal methanation ORC turbine power generation device. This device can effectively utilize the reaction heat of the isothermal methanation furnace to heat boiler water for by-product electricity, avoiding problems such as the difficulty of integrating by-product saturated steam into the steam network, which leads to energy waste, and improving the operating efficiency of the device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The unit includes a No. 1 heater, a No. 1 isothermal methanation furnace, a No. 2 heater, a No. 2 isothermal methanation furnace, an ORC turbine power generation system, and several pipelines.

[0007] The ORC turbine power generation system includes a superheater, a turbine generator, a condenser, a circulating working fluid pump, a preheater, and an evaporator.

[0008] Syngas from outside the boundary is piped through heater #1, isothermal methanation furnace #1, heater #2, and isothermal methanation furnace #2 before connecting to heater #1. The pipeline from the preheater output splits into two branches: the first branch connects to the input of isothermal methanation furnace #1, and the second branch connects to the input of isothermal methanation furnace #2. The first and second branches from the outputs of isothermal methanation furnace #1 and #2 merge and then pipe through the superheater and evaporator before connecting to the preheater. The circulating working fluid pipeline from the superheater is connected to a turbine generator, which then pipes through the condenser, circulating working fluid pump, preheater, and evaporator before connecting to the superheater.

[0009] The beneficial effects of this utility model are as follows: The device includes a No. 1 heater, a No. 1 isothermal methanation furnace, a No. 2 heater, a No. 2 isothermal methanation furnace, an ORC turbine power generation system, and several pipelines. It can effectively utilize the reaction heat of the isothermal methanation furnace to heat boiler water for by-product electricity, avoiding problems such as the difficulty of integrating the by-product saturated steam into the steam network, which would cause energy waste, and improving the operating efficiency of the device. Attached Figure Description

[0010] Figure 1 This is a flowchart illustrating the present invention.

[0011] In the diagram: 1-1# heater, 2-1# isothermal methanation furnace, 3-2# ​​heater, 4-2# isothermal methanation furnace, 5-ORC turbine power generation system, 501-superheater, 502-turbine generator, 503-condenser, 504-circulating working fluid pump, 505-preheater, 506-evaporator. Detailed Implementation

[0012] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited thereto:

[0013] like Figure 1 As shown, an isothermal methanation ORC turbine power generation unit includes a #1 heater 1, a #1 isothermal methanation furnace 2, a #2 heater 3, a #2 isothermal methanation furnace 4, an ORC turbine power generation system 5, and several pipelines. The ORC turbine power generation system includes a superheater 501, a turbine generator 502, a condenser 503, a circulating working fluid pump 504, a preheater 505, and an evaporator 506; the pipeline carrying syngas from outside the site passes sequentially through the #1 heater 1, the #1 isothermal methanation furnace 2, the #2 heater 3, and the #2 isothermal methanation furnace 4 before connecting to the #1 preheater 1.

[0014] The pipeline from the output end of preheater 505 is divided into two branches. The first branch is connected to the input end of isothermal methanation furnace 2 (No. 1), and the second branch is connected to the input end of isothermal methanation furnace 4 (No. 2). The first and second branches from the output ends of isothermal methanation furnace 2 (No. 1) and isothermal methanation furnace 4 (No. 2) merge and then pass through superheater 501 and evaporator 506 in sequence before connecting to preheater 505. The input end of the circulating working fluid pipeline from superheater 501 is connected to turbine generator 502. Turbine generator 502 passes through condenser 503, circulating working fluid pump 504, preheater 505, and evaporator 506 in sequence through pipelines before connecting to superheater 501.

[0015] The working process of this utility model is as follows: Syngas from outside the boundary is heated by heater #1 and then enters isothermal methanation furnace #1 to undergo methanation. The resulting methane-containing process gas enters isothermal methanation furnace #2 via heater #2 for further methanation and then enters preheater #1. The resulting crude methane product is sent to the external cooling system. The high-pressure boiler water from the preheater is divided into two branches, with the first branch entering isothermal methanation furnace #1 and the second branch entering isothermal methanation furnace #2. The boiler water from the two branches is heated separately, then merges and enters the superheater, passes through the evaporator, and then enters the preheater, repeating the above process. The circulating working fluid from the preheater enters the evaporator, is heated, passes through the superheater, enters the turbine generator to generate electricity, and then passes through the condenser and the circulating working fluid pump before entering the preheater, continuing the above cycle.

[0016] The specific implementation process is as follows: 10000Nm from outside the boundary 3 Synthetic gas (40℃, 3.0MPa) is heated to 220℃ by heater #1 and then enters isothermal methanation furnace #1 for methanation. The resulting methane-containing process gas passes through heater #2 and enters isothermal methanation furnace #2 for further methanation. After the temperature rises to 280℃, it enters preheater #1. The resulting crude methane product is sent to the external cooling system. The 6.0MPa pressure boiler water from the preheater has a flow rate of 30,000 kg / h and a temperature of 132℃. It is divided into two branches. The first branch has a flow rate of 20,000 kg / h and enters isothermal methanation furnace #1 to be heated to 240℃. The second branch has a flow rate of 10,000 kg / h and enters isothermal methanation furnace #2 to be heated to 240℃. The boiler water from the two branches merges and enters the superheater. After passing through the evaporator, it enters the preheater, and the above process is repeated. The circulating working fluid from the preheater, at a rate of 3500 kg / h (temperature 220℃, pressure 2.5 MPa), enters the evaporator and is heated. After passing through the superheater, it enters the turbine generator, where it generates 45 kW of electricity. The pressure then decreases to 0.2 MPa. After being cooled to 40℃ by the condenser, it is pressurized to 2.5 MPa by the circulating working fluid pump. After passing through the preheater and evaporator, the temperature rises to 110℃ before entering the superheater, where the cycle continues.

[0017] The isothermal methanation ORC turbine power generation device designed in this utility model can effectively utilize the reaction heat of the isothermal methanation furnace to heat boiler water for by-product electricity, avoiding problems such as the difficulty of integrating the by-product saturated steam into the steam pipeline network, which causes energy waste, and improving the operating efficiency of the device.

[0018] The embodiments and descriptions above are merely illustrative of the principles of this invention and do not limit the scope of protection of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. Parts not covered in this invention are identical to or can be implemented using existing technology.

Claims

1. An isothermal methanation ORC turbine power generation device, characterized in that: The pipeline of syngas from outside the boundary passes through heater 1 (1), isothermal methanation furnace 1 (2), heater 2 (3), and isothermal methanation furnace 2 (4) in sequence and then connects to heater 1 (1); The pipeline from the output end of the preheater (505) is divided into two branches, the first branch is connected to the input end of the No. 1 isothermal methanation furnace (2), and the second branch is connected to the input end of the No. 2 isothermal methanation furnace (4). The output ends of the #1 isothermal methanation furnace (2) and the #2 isothermal methanation furnace (4) are connected to the preheater (505) through pipelines passing through the superheater (501) and the evaporator (506) in sequence.

2. The isothermal methanation ORC turbine power generation device according to claim 1, characterized in that: The inlet of the circulating working fluid pipeline from the superheater (501) is connected to the turbine generator (502), which is connected to the superheater (501) via a pipeline passing through the condenser (503), the circulating working fluid pump (504), the preheater (505), and the evaporator (506).

3. The isothermal methanation ORC turbine power generation device according to claim 1, characterized in that: The crude methanol product from the output of heater (1) goes to the cooling system.

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